| 1 | // [DEAR IMGUI] |
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| 2 | // This is a slightly modified version of stb_truetype.h 1.26. |
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| 3 | // Mostly fixing for compiler and static analyzer warnings. |
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| 4 | // Grep for [DEAR IMGUI] to find the changes. |
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| 5 | |
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| 6 | // stb_truetype.h - v1.26 - public domain |
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| 7 | // authored from 2009-2021 by Sean Barrett / RAD Game Tools |
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| 8 | // |
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| 9 | // ======================================================================= |
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| 10 | // |
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| 11 | // NO SECURITY GUARANTEE -- DO NOT USE THIS ON UNTRUSTED FONT FILES |
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| 12 | // |
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| 13 | // This library does no range checking of the offsets found in the file, |
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| 14 | // meaning an attacker can use it to read arbitrary memory. |
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| 15 | // |
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| 16 | // ======================================================================= |
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| 17 | // |
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| 18 | // This library processes TrueType files: |
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| 19 | // parse files |
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| 20 | // extract glyph metrics |
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| 21 | // extract glyph shapes |
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| 22 | // render glyphs to one-channel bitmaps with antialiasing (box filter) |
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| 23 | // render glyphs to one-channel SDF bitmaps (signed-distance field/function) |
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| 24 | // |
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| 25 | // Todo: |
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| 26 | // non-MS cmaps |
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| 27 | // crashproof on bad data |
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| 28 | // hinting? (no longer patented) |
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| 29 | // cleartype-style AA? |
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| 30 | // optimize: use simple memory allocator for intermediates |
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| 31 | // optimize: build edge-list directly from curves |
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| 32 | // optimize: rasterize directly from curves? |
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| 33 | // |
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| 34 | // ADDITIONAL CONTRIBUTORS |
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| 35 | // |
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| 36 | // Mikko Mononen: compound shape support, more cmap formats |
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| 37 | // Tor Andersson: kerning, subpixel rendering |
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| 38 | // Dougall Johnson: OpenType / Type 2 font handling |
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| 39 | // Daniel Ribeiro Maciel: basic GPOS-based kerning |
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| 40 | // |
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| 41 | // Misc other: |
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| 42 | // Ryan Gordon |
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| 43 | // Simon Glass |
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| 44 | // github:IntellectualKitty |
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| 45 | // Imanol Celaya |
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| 46 | // Daniel Ribeiro Maciel |
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| 47 | // |
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| 48 | // Bug/warning reports/fixes: |
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| 49 | // "Zer" on mollyrocket Fabian "ryg" Giesen github:NiLuJe |
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| 50 | // Cass Everitt Martins Mozeiko github:aloucks |
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| 51 | // stoiko (Haemimont Games) Cap Petschulat github:oyvindjam |
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| 52 | // Brian Hook Omar Cornut github:vassvik |
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| 53 | // Walter van Niftrik Ryan Griege |
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| 54 | // David Gow Peter LaValle |
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| 55 | // David Given Sergey Popov |
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| 56 | // Ivan-Assen Ivanov Giumo X. Clanjor |
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| 57 | // Anthony Pesch Higor Euripedes |
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| 58 | // Johan Duparc Thomas Fields |
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| 59 | // Hou Qiming Derek Vinyard |
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| 60 | // Rob Loach Cort Stratton |
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| 61 | // Kenney Phillis Jr. Brian Costabile |
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| 62 | // Ken Voskuil (kaesve) |
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| 63 | // |
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| 64 | // VERSION HISTORY |
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| 65 | // |
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| 66 | // 1.26 (2021-08-28) fix broken rasterizer |
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| 67 | // 1.25 (2021-07-11) many fixes |
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| 68 | // 1.24 (2020-02-05) fix warning |
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| 69 | // 1.23 (2020-02-02) query SVG data for glyphs; query whole kerning table (but only kern not GPOS) |
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| 70 | // 1.22 (2019-08-11) minimize missing-glyph duplication; fix kerning if both 'GPOS' and 'kern' are defined |
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| 71 | // 1.21 (2019-02-25) fix warning |
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| 72 | // 1.20 (2019-02-07) PackFontRange skips missing codepoints; GetScaleFontVMetrics() |
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| 73 | // 1.19 (2018-02-11) GPOS kerning, STBTT_fmod |
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| 74 | // 1.18 (2018-01-29) add missing function |
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| 75 | // 1.17 (2017-07-23) make more arguments const; doc fix |
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| 76 | // 1.16 (2017-07-12) SDF support |
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| 77 | // 1.15 (2017-03-03) make more arguments const |
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| 78 | // 1.14 (2017-01-16) num-fonts-in-TTC function |
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| 79 | // 1.13 (2017-01-02) support OpenType fonts, certain Apple fonts |
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| 80 | // 1.12 (2016-10-25) suppress warnings about casting away const with -Wcast-qual |
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| 81 | // 1.11 (2016-04-02) fix unused-variable warning |
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| 82 | // 1.10 (2016-04-02) user-defined fabs(); rare memory leak; remove duplicate typedef |
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| 83 | // 1.09 (2016-01-16) warning fix; avoid crash on outofmem; use allocation userdata properly |
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| 84 | // 1.08 (2015-09-13) document stbtt_Rasterize(); fixes for vertical & horizontal edges |
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| 85 | // 1.07 (2015-08-01) allow PackFontRanges to accept arrays of sparse codepoints; |
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| 86 | // variant PackFontRanges to pack and render in separate phases; |
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| 87 | // fix stbtt_GetFontOFfsetForIndex (never worked for non-0 input?); |
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| 88 | // fixed an assert() bug in the new rasterizer |
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| 89 | // replace assert() with STBTT_assert() in new rasterizer |
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| 90 | // |
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| 91 | // Full history can be found at the end of this file. |
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| 92 | // |
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| 93 | // LICENSE |
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| 94 | // |
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| 95 | // See end of file for license information. |
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| 96 | // |
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| 97 | // USAGE |
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| 98 | // |
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| 99 | // Include this file in whatever places need to refer to it. In ONE C/C++ |
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| 100 | // file, write: |
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| 101 | // #define STB_TRUETYPE_IMPLEMENTATION |
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| 102 | // before the #include of this file. This expands out the actual |
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| 103 | // implementation into that C/C++ file. |
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| 104 | // |
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| 105 | // To make the implementation private to the file that generates the implementation, |
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| 106 | // #define STBTT_STATIC |
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| 107 | // |
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| 108 | // Simple 3D API (don't ship this, but it's fine for tools and quick start) |
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| 109 | // stbtt_BakeFontBitmap() -- bake a font to a bitmap for use as texture |
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| 110 | // stbtt_GetBakedQuad() -- compute quad to draw for a given char |
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| 111 | // |
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| 112 | // Improved 3D API (more shippable): |
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| 113 | // #include "stb_rect_pack.h" -- optional, but you really want it |
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| 114 | // stbtt_PackBegin() |
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| 115 | // stbtt_PackSetOversampling() -- for improved quality on small fonts |
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| 116 | // stbtt_PackFontRanges() -- pack and renders |
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| 117 | // stbtt_PackEnd() |
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| 118 | // stbtt_GetPackedQuad() |
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| 119 | // |
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| 120 | // "Load" a font file from a memory buffer (you have to keep the buffer loaded) |
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| 121 | // stbtt_InitFont() |
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| 122 | // stbtt_GetFontOffsetForIndex() -- indexing for TTC font collections |
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| 123 | // stbtt_GetNumberOfFonts() -- number of fonts for TTC font collections |
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| 124 | // |
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| 125 | // Render a unicode codepoint to a bitmap |
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| 126 | // stbtt_GetCodepointBitmap() -- allocates and returns a bitmap |
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| 127 | // stbtt_MakeCodepointBitmap() -- renders into bitmap you provide |
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| 128 | // stbtt_GetCodepointBitmapBox() -- how big the bitmap must be |
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| 129 | // |
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| 130 | // Character advance/positioning |
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| 131 | // stbtt_GetCodepointHMetrics() |
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| 132 | // stbtt_GetFontVMetrics() |
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| 133 | // stbtt_GetFontVMetricsOS2() |
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| 134 | // stbtt_GetCodepointKernAdvance() |
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| 135 | // |
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| 136 | // Starting with version 1.06, the rasterizer was replaced with a new, |
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| 137 | // faster and generally-more-precise rasterizer. The new rasterizer more |
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| 138 | // accurately measures pixel coverage for anti-aliasing, except in the case |
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| 139 | // where multiple shapes overlap, in which case it overestimates the AA pixel |
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| 140 | // coverage. Thus, anti-aliasing of intersecting shapes may look wrong. If |
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| 141 | // this turns out to be a problem, you can re-enable the old rasterizer with |
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| 142 | // #define STBTT_RASTERIZER_VERSION 1 |
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| 143 | // which will incur about a 15% speed hit. |
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| 144 | // |
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| 145 | // ADDITIONAL DOCUMENTATION |
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| 146 | // |
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| 147 | // Immediately after this block comment are a series of sample programs. |
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| 148 | // |
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| 149 | // After the sample programs is the "header file" section. This section |
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| 150 | // includes documentation for each API function. |
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| 151 | // |
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| 152 | // Some important concepts to understand to use this library: |
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| 153 | // |
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| 154 | // Codepoint |
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| 155 | // Characters are defined by unicode codepoints, e.g. 65 is |
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| 156 | // uppercase A, 231 is lowercase c with a cedilla, 0x7e30 is |
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| 157 | // the hiragana for "ma". |
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| 158 | // |
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| 159 | // Glyph |
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| 160 | // A visual character shape (every codepoint is rendered as |
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| 161 | // some glyph) |
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| 162 | // |
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| 163 | // Glyph index |
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| 164 | // A font-specific integer ID representing a glyph |
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| 165 | // |
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| 166 | // Baseline |
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| 167 | // Glyph shapes are defined relative to a baseline, which is the |
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| 168 | // bottom of uppercase characters. Characters extend both above |
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| 169 | // and below the baseline. |
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| 170 | // |
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| 171 | // Current Point |
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| 172 | // As you draw text to the screen, you keep track of a "current point" |
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| 173 | // which is the origin of each character. The current point's vertical |
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| 174 | // position is the baseline. Even "baked fonts" use this model. |
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| 175 | // |
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| 176 | // Vertical Font Metrics |
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| 177 | // The vertical qualities of the font, used to vertically position |
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| 178 | // and space the characters. See docs for stbtt_GetFontVMetrics. |
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| 179 | // |
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| 180 | // Font Size in Pixels or Points |
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| 181 | // The preferred interface for specifying font sizes in stb_truetype |
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| 182 | // is to specify how tall the font's vertical extent should be in pixels. |
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| 183 | // If that sounds good enough, skip the next paragraph. |
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| 184 | // |
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| 185 | // Most font APIs instead use "points", which are a common typographic |
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| 186 | // measurement for describing font size, defined as 72 points per inch. |
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| 187 | // stb_truetype provides a point API for compatibility. However, true |
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| 188 | // "per inch" conventions don't make much sense on computer displays |
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| 189 | // since different monitors have different number of pixels per |
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| 190 | // inch. For example, Windows traditionally uses a convention that |
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| 191 | // there are 96 pixels per inch, thus making 'inch' measurements have |
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| 192 | // nothing to do with inches, and thus effectively defining a point to |
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| 193 | // be 1.333 pixels. Additionally, the TrueType font data provides |
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| 194 | // an explicit scale factor to scale a given font's glyphs to points, |
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| 195 | // but the author has observed that this scale factor is often wrong |
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| 196 | // for non-commercial fonts, thus making fonts scaled in points |
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| 197 | // according to the TrueType spec incoherently sized in practice. |
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| 198 | // |
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| 199 | // DETAILED USAGE: |
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| 200 | // |
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| 201 | // Scale: |
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| 202 | // Select how high you want the font to be, in points or pixels. |
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| 203 | // Call ScaleForPixelHeight or ScaleForMappingEmToPixels to compute |
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| 204 | // a scale factor SF that will be used by all other functions. |
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| 205 | // |
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| 206 | // Baseline: |
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| 207 | // You need to select a y-coordinate that is the baseline of where |
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| 208 | // your text will appear. Call GetFontBoundingBox to get the baseline-relative |
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| 209 | // bounding box for all characters. SF*-y0 will be the distance in pixels |
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| 210 | // that the worst-case character could extend above the baseline, so if |
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| 211 | // you want the top edge of characters to appear at the top of the |
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| 212 | // screen where y=0, then you would set the baseline to SF*-y0. |
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| 213 | // |
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| 214 | // Current point: |
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| 215 | // Set the current point where the first character will appear. The |
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| 216 | // first character could extend left of the current point; this is font |
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| 217 | // dependent. You can either choose a current point that is the leftmost |
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| 218 | // point and hope, or add some padding, or check the bounding box or |
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| 219 | // left-side-bearing of the first character to be displayed and set |
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| 220 | // the current point based on that. |
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| 221 | // |
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| 222 | // Displaying a character: |
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| 223 | // Compute the bounding box of the character. It will contain signed values |
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| 224 | // relative to <current_point, baseline>. I.e. if it returns x0,y0,x1,y1, |
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| 225 | // then the character should be displayed in the rectangle from |
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| 226 | // <current_point+SF*x0, baseline+SF*y0> to <current_point+SF*x1,baseline+SF*y1). |
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| 227 | // |
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| 228 | // Advancing for the next character: |
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| 229 | // Call GlyphHMetrics, and compute 'current_point += SF * advance'. |
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| 230 | // |
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| 231 | // |
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| 232 | // ADVANCED USAGE |
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| 233 | // |
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| 234 | // Quality: |
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| 235 | // |
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| 236 | // - Use the functions with Subpixel at the end to allow your characters |
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| 237 | // to have subpixel positioning. Since the font is anti-aliased, not |
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| 238 | // hinted, this is very import for quality. (This is not possible with |
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| 239 | // baked fonts.) |
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| 240 | // |
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| 241 | // - Kerning is now supported, and if you're supporting subpixel rendering |
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| 242 | // then kerning is worth using to give your text a polished look. |
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| 243 | // |
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| 244 | // Performance: |
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| 245 | // |
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| 246 | // - Convert Unicode codepoints to glyph indexes and operate on the glyphs; |
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| 247 | // if you don't do this, stb_truetype is forced to do the conversion on |
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| 248 | // every call. |
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| 249 | // |
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| 250 | // - There are a lot of memory allocations. We should modify it to take |
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| 251 | // a temp buffer and allocate from the temp buffer (without freeing), |
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| 252 | // should help performance a lot. |
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| 253 | // |
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| 254 | // NOTES |
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| 255 | // |
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| 256 | // The system uses the raw data found in the .ttf file without changing it |
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| 257 | // and without building auxiliary data structures. This is a bit inefficient |
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| 258 | // on little-endian systems (the data is big-endian), but assuming you're |
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| 259 | // caching the bitmaps or glyph shapes this shouldn't be a big deal. |
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| 260 | // |
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| 261 | // It appears to be very hard to programmatically determine what font a |
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| 262 | // given file is in a general way. I provide an API for this, but I don't |
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| 263 | // recommend it. |
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| 264 | // |
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| 265 | // |
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| 266 | // PERFORMANCE MEASUREMENTS FOR 1.06: |
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| 267 | // |
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| 268 | // 32-bit 64-bit |
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| 269 | // Previous release: 8.83 s 7.68 s |
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| 270 | // Pool allocations: 7.72 s 6.34 s |
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| 271 | // Inline sort : 6.54 s 5.65 s |
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| 272 | // New rasterizer : 5.63 s 5.00 s |
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| 273 | |
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| 274 | ////////////////////////////////////////////////////////////////////////////// |
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| 275 | ////////////////////////////////////////////////////////////////////////////// |
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| 276 | //// |
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| 277 | //// SAMPLE PROGRAMS |
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| 278 | //// |
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| 279 | // |
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| 280 | // Incomplete text-in-3d-api example, which draws quads properly aligned to be lossless. |
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| 281 | // See "tests/truetype_demo_win32.c" for a complete version. |
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| 282 | #if 0 |
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| 283 | #define STB_TRUETYPE_IMPLEMENTATION // force following include to generate implementation |
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| 284 | #include "stb_truetype.h" |
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| 285 | |
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| 286 | unsigned char ttf_buffer[1<<20]; |
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| 287 | unsigned char temp_bitmap[512*512]; |
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| 288 | |
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| 289 | stbtt_bakedchar cdata[96]; // ASCII 32..126 is 95 glyphs |
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| 290 | GLuint ftex; |
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| 291 | |
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| 292 | void my_stbtt_initfont(void) |
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| 293 | { |
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| 294 | fread(ttf_buffer, 1, 1<<20, fopen("c:/windows/fonts/times.ttf" , "rb" )); |
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| 295 | stbtt_BakeFontBitmap(ttf_buffer,0, 32.0, temp_bitmap,512,512, 32,96, cdata); // no guarantee this fits! |
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| 296 | // can free ttf_buffer at this point |
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| 297 | glGenTextures(1, &ftex); |
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| 298 | glBindTexture(GL_TEXTURE_2D, ftex); |
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| 299 | glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 512,512, 0, GL_ALPHA, GL_UNSIGNED_BYTE, temp_bitmap); |
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| 300 | // can free temp_bitmap at this point |
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| 301 | glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); |
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| 302 | } |
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| 303 | |
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| 304 | void my_stbtt_print(float x, float y, char *text) |
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| 305 | { |
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| 306 | // assume orthographic projection with units = screen pixels, origin at top left |
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| 307 | glEnable(GL_BLEND); |
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| 308 | glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); |
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| 309 | glEnable(GL_TEXTURE_2D); |
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| 310 | glBindTexture(GL_TEXTURE_2D, ftex); |
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| 311 | glBegin(GL_QUADS); |
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| 312 | while (*text) { |
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| 313 | if (*text >= 32 && *text < 128) { |
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| 314 | stbtt_aligned_quad q; |
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| 315 | stbtt_GetBakedQuad(cdata, 512,512, *text-32, &x,&y,&q,1);//1=opengl & d3d10+,0=d3d9 |
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| 316 | glTexCoord2f(q.s0,q.t0); glVertex2f(q.x0,q.y0); |
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| 317 | glTexCoord2f(q.s1,q.t0); glVertex2f(q.x1,q.y0); |
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| 318 | glTexCoord2f(q.s1,q.t1); glVertex2f(q.x1,q.y1); |
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| 319 | glTexCoord2f(q.s0,q.t1); glVertex2f(q.x0,q.y1); |
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| 320 | } |
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| 321 | ++text; |
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| 322 | } |
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| 323 | glEnd(); |
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| 324 | } |
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| 325 | #endif |
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| 326 | // |
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| 327 | // |
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| 328 | ////////////////////////////////////////////////////////////////////////////// |
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| 329 | // |
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| 330 | // Complete program (this compiles): get a single bitmap, print as ASCII art |
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| 331 | // |
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| 332 | #if 0 |
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| 333 | #include <stdio.h> |
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| 334 | #define STB_TRUETYPE_IMPLEMENTATION // force following include to generate implementation |
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| 335 | #include "stb_truetype.h" |
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| 336 | |
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| 337 | char ttf_buffer[1<<25]; |
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| 338 | |
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| 339 | int main(int argc, char **argv) |
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| 340 | { |
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| 341 | stbtt_fontinfo font; |
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| 342 | unsigned char *bitmap; |
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| 343 | int w,h,i,j,c = (argc > 1 ? atoi(argv[1]) : 'a'), s = (argc > 2 ? atoi(argv[2]) : 20); |
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| 344 | |
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| 345 | fread(ttf_buffer, 1, 1<<25, fopen(argc > 3 ? argv[3] : "c:/windows/fonts/arialbd.ttf" , "rb" )); |
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| 346 | |
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| 347 | stbtt_InitFont(&font, ttf_buffer, stbtt_GetFontOffsetForIndex(ttf_buffer,0)); |
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| 348 | bitmap = stbtt_GetCodepointBitmap(&font, 0,stbtt_ScaleForPixelHeight(&font, s), c, &w, &h, 0,0); |
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| 349 | |
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| 350 | for (j=0; j < h; ++j) { |
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| 351 | for (i=0; i < w; ++i) |
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| 352 | putchar(" .:ioVM@" [bitmap[j*w+i]>>5]); |
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| 353 | putchar('\n'); |
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| 354 | } |
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| 355 | return 0; |
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| 356 | } |
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| 357 | #endif |
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| 358 | // |
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| 359 | // Output: |
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| 360 | // |
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| 361 | // .ii. |
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| 362 | // @@@@@@. |
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| 363 | // V@Mio@@o |
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| 364 | // :i. V@V |
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| 365 | // :oM@@M |
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| 366 | // :@@@MM@M |
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| 367 | // @@o o@M |
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| 368 | // :@@. M@M |
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| 369 | // @@@o@@@@ |
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| 370 | // :M@@V:@@. |
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| 371 | // |
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| 372 | ////////////////////////////////////////////////////////////////////////////// |
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| 373 | // |
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| 374 | // Complete program: print "Hello World!" banner, with bugs |
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| 375 | // |
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| 376 | #if 0 |
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| 377 | char buffer[24<<20]; |
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| 378 | unsigned char screen[20][79]; |
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| 379 | |
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| 380 | int main(int arg, char **argv) |
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| 381 | { |
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| 382 | stbtt_fontinfo font; |
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| 383 | int i,j,ascent,baseline,ch=0; |
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| 384 | float scale, xpos=2; // leave a little padding in case the character extends left |
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| 385 | char *text = "Heljo World!" ; // intentionally misspelled to show 'lj' brokenness |
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| 386 | |
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| 387 | fread(buffer, 1, 1000000, fopen("c:/windows/fonts/arialbd.ttf" , "rb" )); |
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| 388 | stbtt_InitFont(&font, buffer, 0); |
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| 389 | |
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| 390 | scale = stbtt_ScaleForPixelHeight(&font, 15); |
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| 391 | stbtt_GetFontVMetrics(&font, &ascent,0,0); |
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| 392 | baseline = (int) (ascent*scale); |
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| 393 | |
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| 394 | while (text[ch]) { |
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| 395 | int advance,lsb,x0,y0,x1,y1; |
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| 396 | float x_shift = xpos - (float) floor(xpos); |
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| 397 | stbtt_GetCodepointHMetrics(&font, text[ch], &advance, &lsb); |
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| 398 | stbtt_GetCodepointBitmapBoxSubpixel(&font, text[ch], scale,scale,x_shift,0, &x0,&y0,&x1,&y1); |
|---|
| 399 | stbtt_MakeCodepointBitmapSubpixel(&font, &screen[baseline + y0][(int) xpos + x0], x1-x0,y1-y0, 79, scale,scale,x_shift,0, text[ch]); |
|---|
| 400 | // note that this stomps the old data, so where character boxes overlap (e.g. 'lj') it's wrong |
|---|
| 401 | // because this API is really for baking character bitmaps into textures. if you want to render |
|---|
| 402 | // a sequence of characters, you really need to render each bitmap to a temp buffer, then |
|---|
| 403 | // "alpha blend" that into the working buffer |
|---|
| 404 | xpos += (advance * scale); |
|---|
| 405 | if (text[ch+1]) |
|---|
| 406 | xpos += scale*stbtt_GetCodepointKernAdvance(&font, text[ch],text[ch+1]); |
|---|
| 407 | ++ch; |
|---|
| 408 | } |
|---|
| 409 | |
|---|
| 410 | for (j=0; j < 20; ++j) { |
|---|
| 411 | for (i=0; i < 78; ++i) |
|---|
| 412 | putchar(" .:ioVM@" [screen[j][i]>>5]); |
|---|
| 413 | putchar('\n'); |
|---|
| 414 | } |
|---|
| 415 | |
|---|
| 416 | return 0; |
|---|
| 417 | } |
|---|
| 418 | #endif |
|---|
| 419 | |
|---|
| 420 | |
|---|
| 421 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 422 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 423 | //// |
|---|
| 424 | //// INTEGRATION WITH YOUR CODEBASE |
|---|
| 425 | //// |
|---|
| 426 | //// The following sections allow you to supply alternate definitions |
|---|
| 427 | //// of C library functions used by stb_truetype, e.g. if you don't |
|---|
| 428 | //// link with the C runtime library. |
|---|
| 429 | |
|---|
| 430 | #ifdef STB_TRUETYPE_IMPLEMENTATION |
|---|
| 431 | // #define your own (u)stbtt_int8/16/32 before including to override this |
|---|
| 432 | #ifndef stbtt_uint8 |
|---|
| 433 | typedef unsigned char stbtt_uint8; |
|---|
| 434 | typedef signed char stbtt_int8; |
|---|
| 435 | typedef unsigned short stbtt_uint16; |
|---|
| 436 | typedef signed short stbtt_int16; |
|---|
| 437 | typedef unsigned int stbtt_uint32; |
|---|
| 438 | typedef signed int stbtt_int32; |
|---|
| 439 | #endif |
|---|
| 440 | |
|---|
| 441 | typedef char stbtt__check_size32[sizeof(stbtt_int32)==4 ? 1 : -1]; |
|---|
| 442 | typedef char stbtt__check_size16[sizeof(stbtt_int16)==2 ? 1 : -1]; |
|---|
| 443 | |
|---|
| 444 | // e.g. #define your own STBTT_ifloor/STBTT_iceil() to avoid math.h |
|---|
| 445 | #ifndef STBTT_ifloor |
|---|
| 446 | #include <math.h> |
|---|
| 447 | #define STBTT_ifloor(x) ((int) floor(x)) |
|---|
| 448 | #define STBTT_iceil(x) ((int) ceil(x)) |
|---|
| 449 | #endif |
|---|
| 450 | |
|---|
| 451 | #ifndef STBTT_sqrt |
|---|
| 452 | #include <math.h> |
|---|
| 453 | #define STBTT_sqrt(x) sqrt(x) |
|---|
| 454 | #define STBTT_pow(x,y) pow(x,y) |
|---|
| 455 | #endif |
|---|
| 456 | |
|---|
| 457 | #ifndef STBTT_fmod |
|---|
| 458 | #include <math.h> |
|---|
| 459 | #define STBTT_fmod(x,y) fmod(x,y) |
|---|
| 460 | #endif |
|---|
| 461 | |
|---|
| 462 | #ifndef STBTT_cos |
|---|
| 463 | #include <math.h> |
|---|
| 464 | #define STBTT_cos(x) cos(x) |
|---|
| 465 | #define STBTT_acos(x) acos(x) |
|---|
| 466 | #endif |
|---|
| 467 | |
|---|
| 468 | #ifndef STBTT_fabs |
|---|
| 469 | #include <math.h> |
|---|
| 470 | #define STBTT_fabs(x) fabs(x) |
|---|
| 471 | #endif |
|---|
| 472 | |
|---|
| 473 | // #define your own functions "STBTT_malloc" / "STBTT_free" to avoid malloc.h |
|---|
| 474 | #ifndef STBTT_malloc |
|---|
| 475 | #include <stdlib.h> |
|---|
| 476 | #define STBTT_malloc(x,u) ((void)(u),malloc(x)) |
|---|
| 477 | #define STBTT_free(x,u) ((void)(u),free(x)) |
|---|
| 478 | #endif |
|---|
| 479 | |
|---|
| 480 | #ifndef STBTT_assert |
|---|
| 481 | #include <assert.h> |
|---|
| 482 | #define STBTT_assert(x) assert(x) |
|---|
| 483 | #endif |
|---|
| 484 | |
|---|
| 485 | #ifndef STBTT_strlen |
|---|
| 486 | #include <string.h> |
|---|
| 487 | #define STBTT_strlen(x) strlen(x) |
|---|
| 488 | #endif |
|---|
| 489 | |
|---|
| 490 | #ifndef STBTT_memcpy |
|---|
| 491 | #include <string.h> |
|---|
| 492 | #define STBTT_memcpy memcpy |
|---|
| 493 | #define STBTT_memset memset |
|---|
| 494 | #endif |
|---|
| 495 | #endif |
|---|
| 496 | |
|---|
| 497 | /////////////////////////////////////////////////////////////////////////////// |
|---|
| 498 | /////////////////////////////////////////////////////////////////////////////// |
|---|
| 499 | //// |
|---|
| 500 | //// INTERFACE |
|---|
| 501 | //// |
|---|
| 502 | //// |
|---|
| 503 | |
|---|
| 504 | #ifndef __STB_INCLUDE_STB_TRUETYPE_H__ |
|---|
| 505 | #define __STB_INCLUDE_STB_TRUETYPE_H__ |
|---|
| 506 | |
|---|
| 507 | #ifdef STBTT_STATIC |
|---|
| 508 | #define STBTT_DEF static |
|---|
| 509 | #else |
|---|
| 510 | #define STBTT_DEF extern |
|---|
| 511 | #endif |
|---|
| 512 | |
|---|
| 513 | #ifdef __cplusplus |
|---|
| 514 | extern "C" { |
|---|
| 515 | #endif |
|---|
| 516 | |
|---|
| 517 | // private structure |
|---|
| 518 | typedef struct |
|---|
| 519 | { |
|---|
| 520 | unsigned char *data; |
|---|
| 521 | int cursor; |
|---|
| 522 | int size; |
|---|
| 523 | } stbtt__buf; |
|---|
| 524 | |
|---|
| 525 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 526 | // |
|---|
| 527 | // TEXTURE BAKING API |
|---|
| 528 | // |
|---|
| 529 | // If you use this API, you only have to call two functions ever. |
|---|
| 530 | // |
|---|
| 531 | |
|---|
| 532 | typedef struct |
|---|
| 533 | { |
|---|
| 534 | unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap |
|---|
| 535 | float xoff,yoff,xadvance; |
|---|
| 536 | } stbtt_bakedchar; |
|---|
| 537 | |
|---|
| 538 | STBTT_DEF int stbtt_BakeFontBitmap(const unsigned char *data, int offset, // font location (use offset=0 for plain .ttf) |
|---|
| 539 | float pixel_height, // height of font in pixels |
|---|
| 540 | unsigned char *pixels, int pw, int ph, // bitmap to be filled in |
|---|
| 541 | int first_char, int num_chars, // characters to bake |
|---|
| 542 | stbtt_bakedchar *chardata); // you allocate this, it's num_chars long |
|---|
| 543 | // if return is positive, the first unused row of the bitmap |
|---|
| 544 | // if return is negative, returns the negative of the number of characters that fit |
|---|
| 545 | // if return is 0, no characters fit and no rows were used |
|---|
| 546 | // This uses a very crappy packing. |
|---|
| 547 | |
|---|
| 548 | typedef struct |
|---|
| 549 | { |
|---|
| 550 | float x0,y0,s0,t0; // top-left |
|---|
| 551 | float x1,y1,s1,t1; // bottom-right |
|---|
| 552 | } stbtt_aligned_quad; |
|---|
| 553 | |
|---|
| 554 | STBTT_DEF void stbtt_GetBakedQuad(const stbtt_bakedchar *chardata, int pw, int ph, // same data as above |
|---|
| 555 | int char_index, // character to display |
|---|
| 556 | float *xpos, float *ypos, // pointers to current position in screen pixel space |
|---|
| 557 | stbtt_aligned_quad *q, // output: quad to draw |
|---|
| 558 | int opengl_fillrule); // true if opengl fill rule; false if DX9 or earlier |
|---|
| 559 | // Call GetBakedQuad with char_index = 'character - first_char', and it |
|---|
| 560 | // creates the quad you need to draw and advances the current position. |
|---|
| 561 | // |
|---|
| 562 | // The coordinate system used assumes y increases downwards. |
|---|
| 563 | // |
|---|
| 564 | // Characters will extend both above and below the current position; |
|---|
| 565 | // see discussion of "BASELINE" above. |
|---|
| 566 | // |
|---|
| 567 | // It's inefficient; you might want to c&p it and optimize it. |
|---|
| 568 | |
|---|
| 569 | STBTT_DEF void stbtt_GetScaledFontVMetrics(const unsigned char *fontdata, int index, float size, float *ascent, float *descent, float *lineGap); |
|---|
| 570 | // Query the font vertical metrics without having to create a font first. |
|---|
| 571 | |
|---|
| 572 | |
|---|
| 573 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 574 | // |
|---|
| 575 | // NEW TEXTURE BAKING API |
|---|
| 576 | // |
|---|
| 577 | // This provides options for packing multiple fonts into one atlas, not |
|---|
| 578 | // perfectly but better than nothing. |
|---|
| 579 | |
|---|
| 580 | typedef struct |
|---|
| 581 | { |
|---|
| 582 | unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap |
|---|
| 583 | float xoff,yoff,xadvance; |
|---|
| 584 | float xoff2,yoff2; |
|---|
| 585 | } stbtt_packedchar; |
|---|
| 586 | |
|---|
| 587 | typedef struct stbtt_pack_context stbtt_pack_context; |
|---|
| 588 | typedef struct stbtt_fontinfo stbtt_fontinfo; |
|---|
| 589 | #ifndef STB_RECT_PACK_VERSION |
|---|
| 590 | typedef struct stbrp_rect stbrp_rect; |
|---|
| 591 | #endif |
|---|
| 592 | |
|---|
| 593 | STBTT_DEF int stbtt_PackBegin(stbtt_pack_context *spc, unsigned char *pixels, int width, int height, int stride_in_bytes, int padding, void *alloc_context); |
|---|
| 594 | // Initializes a packing context stored in the passed-in stbtt_pack_context. |
|---|
| 595 | // Future calls using this context will pack characters into the bitmap passed |
|---|
| 596 | // in here: a 1-channel bitmap that is width * height. stride_in_bytes is |
|---|
| 597 | // the distance from one row to the next (or 0 to mean they are packed tightly |
|---|
| 598 | // together). "padding" is the amount of padding to leave between each |
|---|
| 599 | // character (normally you want '1' for bitmaps you'll use as textures with |
|---|
| 600 | // bilinear filtering). |
|---|
| 601 | // |
|---|
| 602 | // Returns 0 on failure, 1 on success. |
|---|
| 603 | |
|---|
| 604 | STBTT_DEF void stbtt_PackEnd (stbtt_pack_context *spc); |
|---|
| 605 | // Cleans up the packing context and frees all memory. |
|---|
| 606 | |
|---|
| 607 | #define STBTT_POINT_SIZE(x) (-(x)) |
|---|
| 608 | |
|---|
| 609 | STBTT_DEF int stbtt_PackFontRange(stbtt_pack_context *spc, const unsigned char *fontdata, int font_index, float font_size, |
|---|
| 610 | int first_unicode_char_in_range, int num_chars_in_range, stbtt_packedchar *chardata_for_range); |
|---|
| 611 | // Creates character bitmaps from the font_index'th font found in fontdata (use |
|---|
| 612 | // font_index=0 if you don't know what that is). It creates num_chars_in_range |
|---|
| 613 | // bitmaps for characters with unicode values starting at first_unicode_char_in_range |
|---|
| 614 | // and increasing. Data for how to render them is stored in chardata_for_range; |
|---|
| 615 | // pass these to stbtt_GetPackedQuad to get back renderable quads. |
|---|
| 616 | // |
|---|
| 617 | // font_size is the full height of the character from ascender to descender, |
|---|
| 618 | // as computed by stbtt_ScaleForPixelHeight. To use a point size as computed |
|---|
| 619 | // by stbtt_ScaleForMappingEmToPixels, wrap the point size in STBTT_POINT_SIZE() |
|---|
| 620 | // and pass that result as 'font_size': |
|---|
| 621 | // ..., 20 , ... // font max minus min y is 20 pixels tall |
|---|
| 622 | // ..., STBTT_POINT_SIZE(20), ... // 'M' is 20 pixels tall |
|---|
| 623 | |
|---|
| 624 | typedef struct |
|---|
| 625 | { |
|---|
| 626 | float font_size; |
|---|
| 627 | int first_unicode_codepoint_in_range; // if non-zero, then the chars are continuous, and this is the first codepoint |
|---|
| 628 | int *array_of_unicode_codepoints; // if non-zero, then this is an array of unicode codepoints |
|---|
| 629 | int num_chars; |
|---|
| 630 | stbtt_packedchar *chardata_for_range; // output |
|---|
| 631 | unsigned char h_oversample, v_oversample; // don't set these, they're used internally |
|---|
| 632 | } stbtt_pack_range; |
|---|
| 633 | |
|---|
| 634 | STBTT_DEF int stbtt_PackFontRanges(stbtt_pack_context *spc, const unsigned char *fontdata, int font_index, stbtt_pack_range *ranges, int num_ranges); |
|---|
| 635 | // Creates character bitmaps from multiple ranges of characters stored in |
|---|
| 636 | // ranges. This will usually create a better-packed bitmap than multiple |
|---|
| 637 | // calls to stbtt_PackFontRange. Note that you can call this multiple |
|---|
| 638 | // times within a single PackBegin/PackEnd. |
|---|
| 639 | |
|---|
| 640 | STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h_oversample, unsigned int v_oversample); |
|---|
| 641 | // Oversampling a font increases the quality by allowing higher-quality subpixel |
|---|
| 642 | // positioning, and is especially valuable at smaller text sizes. |
|---|
| 643 | // |
|---|
| 644 | // This function sets the amount of oversampling for all following calls to |
|---|
| 645 | // stbtt_PackFontRange(s) or stbtt_PackFontRangesGatherRects for a given |
|---|
| 646 | // pack context. The default (no oversampling) is achieved by h_oversample=1 |
|---|
| 647 | // and v_oversample=1. The total number of pixels required is |
|---|
| 648 | // h_oversample*v_oversample larger than the default; for example, 2x2 |
|---|
| 649 | // oversampling requires 4x the storage of 1x1. For best results, render |
|---|
| 650 | // oversampled textures with bilinear filtering. Look at the readme in |
|---|
| 651 | // stb/tests/oversample for information about oversampled fonts |
|---|
| 652 | // |
|---|
| 653 | // To use with PackFontRangesGather etc., you must set it before calls |
|---|
| 654 | // call to PackFontRangesGatherRects. |
|---|
| 655 | |
|---|
| 656 | STBTT_DEF void stbtt_PackSetSkipMissingCodepoints(stbtt_pack_context *spc, int skip); |
|---|
| 657 | // If skip != 0, this tells stb_truetype to skip any codepoints for which |
|---|
| 658 | // there is no corresponding glyph. If skip=0, which is the default, then |
|---|
| 659 | // codepoints without a glyph recived the font's "missing character" glyph, |
|---|
| 660 | // typically an empty box by convention. |
|---|
| 661 | |
|---|
| 662 | STBTT_DEF void stbtt_GetPackedQuad(const stbtt_packedchar *chardata, int pw, int ph, // same data as above |
|---|
| 663 | int char_index, // character to display |
|---|
| 664 | float *xpos, float *ypos, // pointers to current position in screen pixel space |
|---|
| 665 | stbtt_aligned_quad *q, // output: quad to draw |
|---|
| 666 | int align_to_integer); |
|---|
| 667 | |
|---|
| 668 | STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects); |
|---|
| 669 | STBTT_DEF void stbtt_PackFontRangesPackRects(stbtt_pack_context *spc, stbrp_rect *rects, int num_rects); |
|---|
| 670 | STBTT_DEF int stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects); |
|---|
| 671 | // Calling these functions in sequence is roughly equivalent to calling |
|---|
| 672 | // stbtt_PackFontRanges(). If you more control over the packing of multiple |
|---|
| 673 | // fonts, or if you want to pack custom data into a font texture, take a look |
|---|
| 674 | // at the source to of stbtt_PackFontRanges() and create a custom version |
|---|
| 675 | // using these functions, e.g. call GatherRects multiple times, |
|---|
| 676 | // building up a single array of rects, then call PackRects once, |
|---|
| 677 | // then call RenderIntoRects repeatedly. This may result in a |
|---|
| 678 | // better packing than calling PackFontRanges multiple times |
|---|
| 679 | // (or it may not). |
|---|
| 680 | |
|---|
| 681 | // this is an opaque structure that you shouldn't mess with which holds |
|---|
| 682 | // all the context needed from PackBegin to PackEnd. |
|---|
| 683 | struct stbtt_pack_context { |
|---|
| 684 | void *user_allocator_context; |
|---|
| 685 | void *pack_info; |
|---|
| 686 | int width; |
|---|
| 687 | int height; |
|---|
| 688 | int stride_in_bytes; |
|---|
| 689 | int padding; |
|---|
| 690 | int skip_missing; |
|---|
| 691 | unsigned int h_oversample, v_oversample; |
|---|
| 692 | unsigned char *pixels; |
|---|
| 693 | void *nodes; |
|---|
| 694 | }; |
|---|
| 695 | |
|---|
| 696 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 697 | // |
|---|
| 698 | // FONT LOADING |
|---|
| 699 | // |
|---|
| 700 | // |
|---|
| 701 | |
|---|
| 702 | STBTT_DEF int stbtt_GetNumberOfFonts(const unsigned char *data); |
|---|
| 703 | // This function will determine the number of fonts in a font file. TrueType |
|---|
| 704 | // collection (.ttc) files may contain multiple fonts, while TrueType font |
|---|
| 705 | // (.ttf) files only contain one font. The number of fonts can be used for |
|---|
| 706 | // indexing with the previous function where the index is between zero and one |
|---|
| 707 | // less than the total fonts. If an error occurs, -1 is returned. |
|---|
| 708 | |
|---|
| 709 | STBTT_DEF int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index); |
|---|
| 710 | // Each .ttf/.ttc file may have more than one font. Each font has a sequential |
|---|
| 711 | // index number starting from 0. Call this function to get the font offset for |
|---|
| 712 | // a given index; it returns -1 if the index is out of range. A regular .ttf |
|---|
| 713 | // file will only define one font and it always be at offset 0, so it will |
|---|
| 714 | // return '0' for index 0, and -1 for all other indices. |
|---|
| 715 | |
|---|
| 716 | // The following structure is defined publicly so you can declare one on |
|---|
| 717 | // the stack or as a global or etc, but you should treat it as opaque. |
|---|
| 718 | struct stbtt_fontinfo |
|---|
| 719 | { |
|---|
| 720 | void * userdata; |
|---|
| 721 | unsigned char * data; // pointer to .ttf file |
|---|
| 722 | int fontstart; // offset of start of font |
|---|
| 723 | |
|---|
| 724 | int numGlyphs; // number of glyphs, needed for range checking |
|---|
| 725 | |
|---|
| 726 | int loca,head,glyf,hhea,hmtx,kern,gpos,svg; // table locations as offset from start of .ttf |
|---|
| 727 | int index_map; // a cmap mapping for our chosen character encoding |
|---|
| 728 | int indexToLocFormat; // format needed to map from glyph index to glyph |
|---|
| 729 | |
|---|
| 730 | stbtt__buf cff; // cff font data |
|---|
| 731 | stbtt__buf charstrings; // the charstring index |
|---|
| 732 | stbtt__buf gsubrs; // global charstring subroutines index |
|---|
| 733 | stbtt__buf subrs; // private charstring subroutines index |
|---|
| 734 | stbtt__buf fontdicts; // array of font dicts |
|---|
| 735 | stbtt__buf fdselect; // map from glyph to fontdict |
|---|
| 736 | }; |
|---|
| 737 | |
|---|
| 738 | STBTT_DEF int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data, int offset); |
|---|
| 739 | // Given an offset into the file that defines a font, this function builds |
|---|
| 740 | // the necessary cached info for the rest of the system. You must allocate |
|---|
| 741 | // the stbtt_fontinfo yourself, and stbtt_InitFont will fill it out. You don't |
|---|
| 742 | // need to do anything special to free it, because the contents are pure |
|---|
| 743 | // value data with no additional data structures. Returns 0 on failure. |
|---|
| 744 | |
|---|
| 745 | |
|---|
| 746 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 747 | // |
|---|
| 748 | // CHARACTER TO GLYPH-INDEX CONVERSIOn |
|---|
| 749 | |
|---|
| 750 | STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint); |
|---|
| 751 | // If you're going to perform multiple operations on the same character |
|---|
| 752 | // and you want a speed-up, call this function with the character you're |
|---|
| 753 | // going to process, then use glyph-based functions instead of the |
|---|
| 754 | // codepoint-based functions. |
|---|
| 755 | // Returns 0 if the character codepoint is not defined in the font. |
|---|
| 756 | |
|---|
| 757 | |
|---|
| 758 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 759 | // |
|---|
| 760 | // CHARACTER PROPERTIES |
|---|
| 761 | // |
|---|
| 762 | |
|---|
| 763 | STBTT_DEF float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float pixels); |
|---|
| 764 | // computes a scale factor to produce a font whose "height" is 'pixels' tall. |
|---|
| 765 | // Height is measured as the distance from the highest ascender to the lowest |
|---|
| 766 | // descender; in other words, it's equivalent to calling stbtt_GetFontVMetrics |
|---|
| 767 | // and computing: |
|---|
| 768 | // scale = pixels / (ascent - descent) |
|---|
| 769 | // so if you prefer to measure height by the ascent only, use a similar calculation. |
|---|
| 770 | |
|---|
| 771 | STBTT_DEF float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels); |
|---|
| 772 | // computes a scale factor to produce a font whose EM size is mapped to |
|---|
| 773 | // 'pixels' tall. This is probably what traditional APIs compute, but |
|---|
| 774 | // I'm not positive. |
|---|
| 775 | |
|---|
| 776 | STBTT_DEF void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap); |
|---|
| 777 | // ascent is the coordinate above the baseline the font extends; descent |
|---|
| 778 | // is the coordinate below the baseline the font extends (i.e. it is typically negative) |
|---|
| 779 | // lineGap is the spacing between one row's descent and the next row's ascent... |
|---|
| 780 | // so you should advance the vertical position by "*ascent - *descent + *lineGap" |
|---|
| 781 | // these are expressed in unscaled coordinates, so you must multiply by |
|---|
| 782 | // the scale factor for a given size |
|---|
| 783 | |
|---|
| 784 | STBTT_DEF int stbtt_GetFontVMetricsOS2(const stbtt_fontinfo *info, int *typoAscent, int *typoDescent, int *typoLineGap); |
|---|
| 785 | // analogous to GetFontVMetrics, but returns the "typographic" values from the OS/2 |
|---|
| 786 | // table (specific to MS/Windows TTF files). |
|---|
| 787 | // |
|---|
| 788 | // Returns 1 on success (table present), 0 on failure. |
|---|
| 789 | |
|---|
| 790 | STBTT_DEF void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1); |
|---|
| 791 | // the bounding box around all possible characters |
|---|
| 792 | |
|---|
| 793 | STBTT_DEF void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing); |
|---|
| 794 | // leftSideBearing is the offset from the current horizontal position to the left edge of the character |
|---|
| 795 | // advanceWidth is the offset from the current horizontal position to the next horizontal position |
|---|
| 796 | // these are expressed in unscaled coordinates |
|---|
| 797 | |
|---|
| 798 | STBTT_DEF int stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2); |
|---|
| 799 | // an additional amount to add to the 'advance' value between ch1 and ch2 |
|---|
| 800 | |
|---|
| 801 | STBTT_DEF int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1); |
|---|
| 802 | // Gets the bounding box of the visible part of the glyph, in unscaled coordinates |
|---|
| 803 | |
|---|
| 804 | STBTT_DEF void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing); |
|---|
| 805 | STBTT_DEF int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2); |
|---|
| 806 | STBTT_DEF int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1); |
|---|
| 807 | // as above, but takes one or more glyph indices for greater efficiency |
|---|
| 808 | |
|---|
| 809 | typedef struct stbtt_kerningentry |
|---|
| 810 | { |
|---|
| 811 | int glyph1; // use stbtt_FindGlyphIndex |
|---|
| 812 | int glyph2; |
|---|
| 813 | int advance; |
|---|
| 814 | } stbtt_kerningentry; |
|---|
| 815 | |
|---|
| 816 | STBTT_DEF int stbtt_GetKerningTableLength(const stbtt_fontinfo *info); |
|---|
| 817 | STBTT_DEF int stbtt_GetKerningTable(const stbtt_fontinfo *info, stbtt_kerningentry* table, int table_length); |
|---|
| 818 | // Retrieves a complete list of all of the kerning pairs provided by the font |
|---|
| 819 | // stbtt_GetKerningTable never writes more than table_length entries and returns how many entries it did write. |
|---|
| 820 | // The table will be sorted by (a.glyph1 == b.glyph1)?(a.glyph2 < b.glyph2):(a.glyph1 < b.glyph1) |
|---|
| 821 | |
|---|
| 822 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 823 | // |
|---|
| 824 | // GLYPH SHAPES (you probably don't need these, but they have to go before |
|---|
| 825 | // the bitmaps for C declaration-order reasons) |
|---|
| 826 | // |
|---|
| 827 | |
|---|
| 828 | #ifndef STBTT_vmove // you can predefine these to use different values (but why?) |
|---|
| 829 | enum { |
|---|
| 830 | STBTT_vmove=1, |
|---|
| 831 | STBTT_vline, |
|---|
| 832 | STBTT_vcurve, |
|---|
| 833 | STBTT_vcubic |
|---|
| 834 | }; |
|---|
| 835 | #endif |
|---|
| 836 | |
|---|
| 837 | #ifndef stbtt_vertex // you can predefine this to use different values |
|---|
| 838 | // (we share this with other code at RAD) |
|---|
| 839 | #define stbtt_vertex_type short // can't use stbtt_int16 because that's not visible in the header file |
|---|
| 840 | typedef struct |
|---|
| 841 | { |
|---|
| 842 | stbtt_vertex_type x,y,cx,cy,cx1,cy1; |
|---|
| 843 | unsigned char type,padding; |
|---|
| 844 | } stbtt_vertex; |
|---|
| 845 | #endif |
|---|
| 846 | |
|---|
| 847 | STBTT_DEF int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index); |
|---|
| 848 | // returns non-zero if nothing is drawn for this glyph |
|---|
| 849 | |
|---|
| 850 | STBTT_DEF int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices); |
|---|
| 851 | STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **vertices); |
|---|
| 852 | // returns # of vertices and fills *vertices with the pointer to them |
|---|
| 853 | // these are expressed in "unscaled" coordinates |
|---|
| 854 | // |
|---|
| 855 | // The shape is a series of contours. Each one starts with |
|---|
| 856 | // a STBTT_moveto, then consists of a series of mixed |
|---|
| 857 | // STBTT_lineto and STBTT_curveto segments. A lineto |
|---|
| 858 | // draws a line from previous endpoint to its x,y; a curveto |
|---|
| 859 | // draws a quadratic bezier from previous endpoint to |
|---|
| 860 | // its x,y, using cx,cy as the bezier control point. |
|---|
| 861 | |
|---|
| 862 | STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *vertices); |
|---|
| 863 | // frees the data allocated above |
|---|
| 864 | |
|---|
| 865 | STBTT_DEF unsigned char *stbtt_FindSVGDoc(const stbtt_fontinfo *info, int gl); |
|---|
| 866 | STBTT_DEF int stbtt_GetCodepointSVG(const stbtt_fontinfo *info, int unicode_codepoint, const char **svg); |
|---|
| 867 | STBTT_DEF int stbtt_GetGlyphSVG(const stbtt_fontinfo *info, int gl, const char **svg); |
|---|
| 868 | // fills svg with the character's SVG data. |
|---|
| 869 | // returns data size or 0 if SVG not found. |
|---|
| 870 | |
|---|
| 871 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 872 | // |
|---|
| 873 | // BITMAP RENDERING |
|---|
| 874 | // |
|---|
| 875 | |
|---|
| 876 | STBTT_DEF void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata); |
|---|
| 877 | // frees the bitmap allocated below |
|---|
| 878 | |
|---|
| 879 | STBTT_DEF unsigned char *stbtt_GetCodepointBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int codepoint, int *width, int *height, int *xoff, int *yoff); |
|---|
| 880 | // allocates a large-enough single-channel 8bpp bitmap and renders the |
|---|
| 881 | // specified character/glyph at the specified scale into it, with |
|---|
| 882 | // antialiasing. 0 is no coverage (transparent), 255 is fully covered (opaque). |
|---|
| 883 | // *width & *height are filled out with the width & height of the bitmap, |
|---|
| 884 | // which is stored left-to-right, top-to-bottom. |
|---|
| 885 | // |
|---|
| 886 | // xoff/yoff are the offset it pixel space from the glyph origin to the top-left of the bitmap |
|---|
| 887 | |
|---|
| 888 | STBTT_DEF unsigned char *stbtt_GetCodepointBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint, int *width, int *height, int *xoff, int *yoff); |
|---|
| 889 | // the same as stbtt_GetCodepoitnBitmap, but you can specify a subpixel |
|---|
| 890 | // shift for the character |
|---|
| 891 | |
|---|
| 892 | STBTT_DEF void stbtt_MakeCodepointBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int codepoint); |
|---|
| 893 | // the same as stbtt_GetCodepointBitmap, but you pass in storage for the bitmap |
|---|
| 894 | // in the form of 'output', with row spacing of 'out_stride' bytes. the bitmap |
|---|
| 895 | // is clipped to out_w/out_h bytes. Call stbtt_GetCodepointBitmapBox to get the |
|---|
| 896 | // width and height and positioning info for it first. |
|---|
| 897 | |
|---|
| 898 | STBTT_DEF void stbtt_MakeCodepointBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint); |
|---|
| 899 | // same as stbtt_MakeCodepointBitmap, but you can specify a subpixel |
|---|
| 900 | // shift for the character |
|---|
| 901 | |
|---|
| 902 | STBTT_DEF void stbtt_MakeCodepointBitmapSubpixelPrefilter(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int oversample_x, int oversample_y, float *sub_x, float *sub_y, int codepoint); |
|---|
| 903 | // same as stbtt_MakeCodepointBitmapSubpixel, but prefiltering |
|---|
| 904 | // is performed (see stbtt_PackSetOversampling) |
|---|
| 905 | |
|---|
| 906 | STBTT_DEF void stbtt_GetCodepointBitmapBox(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1); |
|---|
| 907 | // get the bbox of the bitmap centered around the glyph origin; so the |
|---|
| 908 | // bitmap width is ix1-ix0, height is iy1-iy0, and location to place |
|---|
| 909 | // the bitmap top left is (leftSideBearing*scale,iy0). |
|---|
| 910 | // (Note that the bitmap uses y-increases-down, but the shape uses |
|---|
| 911 | // y-increases-up, so CodepointBitmapBox and CodepointBox are inverted.) |
|---|
| 912 | |
|---|
| 913 | STBTT_DEF void stbtt_GetCodepointBitmapBoxSubpixel(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1); |
|---|
| 914 | // same as stbtt_GetCodepointBitmapBox, but you can specify a subpixel |
|---|
| 915 | // shift for the character |
|---|
| 916 | |
|---|
| 917 | // the following functions are equivalent to the above functions, but operate |
|---|
| 918 | // on glyph indices instead of Unicode codepoints (for efficiency) |
|---|
| 919 | STBTT_DEF unsigned char *stbtt_GetGlyphBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int glyph, int *width, int *height, int *xoff, int *yoff); |
|---|
| 920 | STBTT_DEF unsigned char *stbtt_GetGlyphBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int glyph, int *width, int *height, int *xoff, int *yoff); |
|---|
| 921 | STBTT_DEF void stbtt_MakeGlyphBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int glyph); |
|---|
| 922 | STBTT_DEF void stbtt_MakeGlyphBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int glyph); |
|---|
| 923 | STBTT_DEF void stbtt_MakeGlyphBitmapSubpixelPrefilter(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int oversample_x, int oversample_y, float *sub_x, float *sub_y, int glyph); |
|---|
| 924 | STBTT_DEF void stbtt_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1); |
|---|
| 925 | STBTT_DEF void stbtt_GetGlyphBitmapBoxSubpixel(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y,float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1); |
|---|
| 926 | |
|---|
| 927 | |
|---|
| 928 | // @TODO: don't expose this structure |
|---|
| 929 | typedef struct |
|---|
| 930 | { |
|---|
| 931 | int w,h,stride; |
|---|
| 932 | unsigned char *pixels; |
|---|
| 933 | } stbtt__bitmap; |
|---|
| 934 | |
|---|
| 935 | // rasterize a shape with quadratic beziers into a bitmap |
|---|
| 936 | STBTT_DEF void stbtt_Rasterize(stbtt__bitmap *result, // 1-channel bitmap to draw into |
|---|
| 937 | float flatness_in_pixels, // allowable error of curve in pixels |
|---|
| 938 | stbtt_vertex *vertices, // array of vertices defining shape |
|---|
| 939 | int num_verts, // number of vertices in above array |
|---|
| 940 | float scale_x, float scale_y, // scale applied to input vertices |
|---|
| 941 | float shift_x, float shift_y, // translation applied to input vertices |
|---|
| 942 | int x_off, int y_off, // another translation applied to input |
|---|
| 943 | int invert, // if non-zero, vertically flip shape |
|---|
| 944 | void *userdata); // context for to STBTT_MALLOC |
|---|
| 945 | |
|---|
| 946 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 947 | // |
|---|
| 948 | // Signed Distance Function (or Field) rendering |
|---|
| 949 | |
|---|
| 950 | STBTT_DEF void stbtt_FreeSDF(unsigned char *bitmap, void *userdata); |
|---|
| 951 | // frees the SDF bitmap allocated below |
|---|
| 952 | |
|---|
| 953 | STBTT_DEF unsigned char * stbtt_GetGlyphSDF(const stbtt_fontinfo *info, float scale, int glyph, int padding, unsigned char onedge_value, float pixel_dist_scale, int *width, int *height, int *xoff, int *yoff); |
|---|
| 954 | STBTT_DEF unsigned char * stbtt_GetCodepointSDF(const stbtt_fontinfo *info, float scale, int codepoint, int padding, unsigned char onedge_value, float pixel_dist_scale, int *width, int *height, int *xoff, int *yoff); |
|---|
| 955 | // These functions compute a discretized SDF field for a single character, suitable for storing |
|---|
| 956 | // in a single-channel texture, sampling with bilinear filtering, and testing against |
|---|
| 957 | // larger than some threshold to produce scalable fonts. |
|---|
| 958 | // info -- the font |
|---|
| 959 | // scale -- controls the size of the resulting SDF bitmap, same as it would be creating a regular bitmap |
|---|
| 960 | // glyph/codepoint -- the character to generate the SDF for |
|---|
| 961 | // padding -- extra "pixels" around the character which are filled with the distance to the character (not 0), |
|---|
| 962 | // which allows effects like bit outlines |
|---|
| 963 | // onedge_value -- value 0-255 to test the SDF against to reconstruct the character (i.e. the isocontour of the character) |
|---|
| 964 | // pixel_dist_scale -- what value the SDF should increase by when moving one SDF "pixel" away from the edge (on the 0..255 scale) |
|---|
| 965 | // if positive, > onedge_value is inside; if negative, < onedge_value is inside |
|---|
| 966 | // width,height -- output height & width of the SDF bitmap (including padding) |
|---|
| 967 | // xoff,yoff -- output origin of the character |
|---|
| 968 | // return value -- a 2D array of bytes 0..255, width*height in size |
|---|
| 969 | // |
|---|
| 970 | // pixel_dist_scale & onedge_value are a scale & bias that allows you to make |
|---|
| 971 | // optimal use of the limited 0..255 for your application, trading off precision |
|---|
| 972 | // and special effects. SDF values outside the range 0..255 are clamped to 0..255. |
|---|
| 973 | // |
|---|
| 974 | // Example: |
|---|
| 975 | // scale = stbtt_ScaleForPixelHeight(22) |
|---|
| 976 | // padding = 5 |
|---|
| 977 | // onedge_value = 180 |
|---|
| 978 | // pixel_dist_scale = 180/5.0 = 36.0 |
|---|
| 979 | // |
|---|
| 980 | // This will create an SDF bitmap in which the character is about 22 pixels |
|---|
| 981 | // high but the whole bitmap is about 22+5+5=32 pixels high. To produce a filled |
|---|
| 982 | // shape, sample the SDF at each pixel and fill the pixel if the SDF value |
|---|
| 983 | // is greater than or equal to 180/255. (You'll actually want to antialias, |
|---|
| 984 | // which is beyond the scope of this example.) Additionally, you can compute |
|---|
| 985 | // offset outlines (e.g. to stroke the character border inside & outside, |
|---|
| 986 | // or only outside). For example, to fill outside the character up to 3 SDF |
|---|
| 987 | // pixels, you would compare against (180-36.0*3)/255 = 72/255. The above |
|---|
| 988 | // choice of variables maps a range from 5 pixels outside the shape to |
|---|
| 989 | // 2 pixels inside the shape to 0..255; this is intended primarily for apply |
|---|
| 990 | // outside effects only (the interior range is needed to allow proper |
|---|
| 991 | // antialiasing of the font at *smaller* sizes) |
|---|
| 992 | // |
|---|
| 993 | // The function computes the SDF analytically at each SDF pixel, not by e.g. |
|---|
| 994 | // building a higher-res bitmap and approximating it. In theory the quality |
|---|
| 995 | // should be as high as possible for an SDF of this size & representation, but |
|---|
| 996 | // unclear if this is true in practice (perhaps building a higher-res bitmap |
|---|
| 997 | // and computing from that can allow drop-out prevention). |
|---|
| 998 | // |
|---|
| 999 | // The algorithm has not been optimized at all, so expect it to be slow |
|---|
| 1000 | // if computing lots of characters or very large sizes. |
|---|
| 1001 | |
|---|
| 1002 | |
|---|
| 1003 | |
|---|
| 1004 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 1005 | // |
|---|
| 1006 | // Finding the right font... |
|---|
| 1007 | // |
|---|
| 1008 | // You should really just solve this offline, keep your own tables |
|---|
| 1009 | // of what font is what, and don't try to get it out of the .ttf file. |
|---|
| 1010 | // That's because getting it out of the .ttf file is really hard, because |
|---|
| 1011 | // the names in the file can appear in many possible encodings, in many |
|---|
| 1012 | // possible languages, and e.g. if you need a case-insensitive comparison, |
|---|
| 1013 | // the details of that depend on the encoding & language in a complex way |
|---|
| 1014 | // (actually underspecified in truetype, but also gigantic). |
|---|
| 1015 | // |
|---|
| 1016 | // But you can use the provided functions in two possible ways: |
|---|
| 1017 | // stbtt_FindMatchingFont() will use *case-sensitive* comparisons on |
|---|
| 1018 | // unicode-encoded names to try to find the font you want; |
|---|
| 1019 | // you can run this before calling stbtt_InitFont() |
|---|
| 1020 | // |
|---|
| 1021 | // stbtt_GetFontNameString() lets you get any of the various strings |
|---|
| 1022 | // from the file yourself and do your own comparisons on them. |
|---|
| 1023 | // You have to have called stbtt_InitFont() first. |
|---|
| 1024 | |
|---|
| 1025 | |
|---|
| 1026 | STBTT_DEF int stbtt_FindMatchingFont(const unsigned char *fontdata, const char *name, int flags); |
|---|
| 1027 | // returns the offset (not index) of the font that matches, or -1 if none |
|---|
| 1028 | // if you use STBTT_MACSTYLE_DONTCARE, use a font name like "Arial Bold". |
|---|
| 1029 | // if you use any other flag, use a font name like "Arial"; this checks |
|---|
| 1030 | // the 'macStyle' header field; i don't know if fonts set this consistently |
|---|
| 1031 | #define STBTT_MACSTYLE_DONTCARE 0 |
|---|
| 1032 | #define STBTT_MACSTYLE_BOLD 1 |
|---|
| 1033 | #define STBTT_MACSTYLE_ITALIC 2 |
|---|
| 1034 | #define STBTT_MACSTYLE_UNDERSCORE 4 |
|---|
| 1035 | #define STBTT_MACSTYLE_NONE 8 // <= not same as 0, this makes us check the bitfield is 0 |
|---|
| 1036 | |
|---|
| 1037 | STBTT_DEF int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2); |
|---|
| 1038 | // returns 1/0 whether the first string interpreted as utf8 is identical to |
|---|
| 1039 | // the second string interpreted as big-endian utf16... useful for strings from next func |
|---|
| 1040 | |
|---|
| 1041 | STBTT_DEF const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID); |
|---|
| 1042 | // returns the string (which may be big-endian double byte, e.g. for unicode) |
|---|
| 1043 | // and puts the length in bytes in *length. |
|---|
| 1044 | // |
|---|
| 1045 | // some of the values for the IDs are below; for more see the truetype spec: |
|---|
| 1046 | // http://developer.apple.com/textfonts/TTRefMan/RM06/Chap6name.html |
|---|
| 1047 | // http://www.microsoft.com/typography/otspec/name.htm |
|---|
| 1048 | |
|---|
| 1049 | enum { // platformID |
|---|
| 1050 | STBTT_PLATFORM_ID_UNICODE =0, |
|---|
| 1051 | STBTT_PLATFORM_ID_MAC =1, |
|---|
| 1052 | STBTT_PLATFORM_ID_ISO =2, |
|---|
| 1053 | STBTT_PLATFORM_ID_MICROSOFT =3 |
|---|
| 1054 | }; |
|---|
| 1055 | |
|---|
| 1056 | enum { // encodingID for STBTT_PLATFORM_ID_UNICODE |
|---|
| 1057 | STBTT_UNICODE_EID_UNICODE_1_0 =0, |
|---|
| 1058 | STBTT_UNICODE_EID_UNICODE_1_1 =1, |
|---|
| 1059 | STBTT_UNICODE_EID_ISO_10646 =2, |
|---|
| 1060 | STBTT_UNICODE_EID_UNICODE_2_0_BMP=3, |
|---|
| 1061 | STBTT_UNICODE_EID_UNICODE_2_0_FULL=4 |
|---|
| 1062 | }; |
|---|
| 1063 | |
|---|
| 1064 | enum { // encodingID for STBTT_PLATFORM_ID_MICROSOFT |
|---|
| 1065 | STBTT_MS_EID_SYMBOL =0, |
|---|
| 1066 | STBTT_MS_EID_UNICODE_BMP =1, |
|---|
| 1067 | STBTT_MS_EID_SHIFTJIS =2, |
|---|
| 1068 | STBTT_MS_EID_UNICODE_FULL =10 |
|---|
| 1069 | }; |
|---|
| 1070 | |
|---|
| 1071 | enum { // encodingID for STBTT_PLATFORM_ID_MAC; same as Script Manager codes |
|---|
| 1072 | STBTT_MAC_EID_ROMAN =0, STBTT_MAC_EID_ARABIC =4, |
|---|
| 1073 | STBTT_MAC_EID_JAPANESE =1, STBTT_MAC_EID_HEBREW =5, |
|---|
| 1074 | STBTT_MAC_EID_CHINESE_TRAD =2, STBTT_MAC_EID_GREEK =6, |
|---|
| 1075 | STBTT_MAC_EID_KOREAN =3, STBTT_MAC_EID_RUSSIAN =7 |
|---|
| 1076 | }; |
|---|
| 1077 | |
|---|
| 1078 | enum { // languageID for STBTT_PLATFORM_ID_MICROSOFT; same as LCID... |
|---|
| 1079 | // problematic because there are e.g. 16 english LCIDs and 16 arabic LCIDs |
|---|
| 1080 | STBTT_MS_LANG_ENGLISH =0x0409, STBTT_MS_LANG_ITALIAN =0x0410, |
|---|
| 1081 | STBTT_MS_LANG_CHINESE =0x0804, STBTT_MS_LANG_JAPANESE =0x0411, |
|---|
| 1082 | STBTT_MS_LANG_DUTCH =0x0413, STBTT_MS_LANG_KOREAN =0x0412, |
|---|
| 1083 | STBTT_MS_LANG_FRENCH =0x040c, STBTT_MS_LANG_RUSSIAN =0x0419, |
|---|
| 1084 | STBTT_MS_LANG_GERMAN =0x0407, STBTT_MS_LANG_SPANISH =0x0409, |
|---|
| 1085 | STBTT_MS_LANG_HEBREW =0x040d, STBTT_MS_LANG_SWEDISH =0x041D |
|---|
| 1086 | }; |
|---|
| 1087 | |
|---|
| 1088 | enum { // languageID for STBTT_PLATFORM_ID_MAC |
|---|
| 1089 | STBTT_MAC_LANG_ENGLISH =0 , STBTT_MAC_LANG_JAPANESE =11, |
|---|
| 1090 | STBTT_MAC_LANG_ARABIC =12, STBTT_MAC_LANG_KOREAN =23, |
|---|
| 1091 | STBTT_MAC_LANG_DUTCH =4 , STBTT_MAC_LANG_RUSSIAN =32, |
|---|
| 1092 | STBTT_MAC_LANG_FRENCH =1 , STBTT_MAC_LANG_SPANISH =6 , |
|---|
| 1093 | STBTT_MAC_LANG_GERMAN =2 , STBTT_MAC_LANG_SWEDISH =5 , |
|---|
| 1094 | STBTT_MAC_LANG_HEBREW =10, STBTT_MAC_LANG_CHINESE_SIMPLIFIED =33, |
|---|
| 1095 | STBTT_MAC_LANG_ITALIAN =3 , STBTT_MAC_LANG_CHINESE_TRAD =19 |
|---|
| 1096 | }; |
|---|
| 1097 | |
|---|
| 1098 | #ifdef __cplusplus |
|---|
| 1099 | } |
|---|
| 1100 | #endif |
|---|
| 1101 | |
|---|
| 1102 | #endif // __STB_INCLUDE_STB_TRUETYPE_H__ |
|---|
| 1103 | |
|---|
| 1104 | /////////////////////////////////////////////////////////////////////////////// |
|---|
| 1105 | /////////////////////////////////////////////////////////////////////////////// |
|---|
| 1106 | //// |
|---|
| 1107 | //// IMPLEMENTATION |
|---|
| 1108 | //// |
|---|
| 1109 | //// |
|---|
| 1110 | |
|---|
| 1111 | #ifdef STB_TRUETYPE_IMPLEMENTATION |
|---|
| 1112 | |
|---|
| 1113 | #ifndef STBTT_MAX_OVERSAMPLE |
|---|
| 1114 | #define STBTT_MAX_OVERSAMPLE 8 |
|---|
| 1115 | #endif |
|---|
| 1116 | |
|---|
| 1117 | #if STBTT_MAX_OVERSAMPLE > 255 |
|---|
| 1118 | #error "STBTT_MAX_OVERSAMPLE cannot be > 255" |
|---|
| 1119 | #endif |
|---|
| 1120 | |
|---|
| 1121 | typedef int stbtt__test_oversample_pow2[(STBTT_MAX_OVERSAMPLE & (STBTT_MAX_OVERSAMPLE-1)) == 0 ? 1 : -1]; |
|---|
| 1122 | |
|---|
| 1123 | #ifndef STBTT_RASTERIZER_VERSION |
|---|
| 1124 | #define STBTT_RASTERIZER_VERSION 2 |
|---|
| 1125 | #endif |
|---|
| 1126 | |
|---|
| 1127 | #ifdef _MSC_VER |
|---|
| 1128 | #define STBTT__NOTUSED(v) (void)(v) |
|---|
| 1129 | #else |
|---|
| 1130 | #define STBTT__NOTUSED(v) (void)sizeof(v) |
|---|
| 1131 | #endif |
|---|
| 1132 | |
|---|
| 1133 | ////////////////////////////////////////////////////////////////////////// |
|---|
| 1134 | // |
|---|
| 1135 | // stbtt__buf helpers to parse data from file |
|---|
| 1136 | // |
|---|
| 1137 | |
|---|
| 1138 | static stbtt_uint8 stbtt__buf_get8(stbtt__buf *b) |
|---|
| 1139 | { |
|---|
| 1140 | if (b->cursor >= b->size) |
|---|
| 1141 | return 0; |
|---|
| 1142 | return b->data[b->cursor++]; |
|---|
| 1143 | } |
|---|
| 1144 | |
|---|
| 1145 | static stbtt_uint8 stbtt__buf_peek8(stbtt__buf *b) |
|---|
| 1146 | { |
|---|
| 1147 | if (b->cursor >= b->size) |
|---|
| 1148 | return 0; |
|---|
| 1149 | return b->data[b->cursor]; |
|---|
| 1150 | } |
|---|
| 1151 | |
|---|
| 1152 | static void stbtt__buf_seek(stbtt__buf *b, int o) |
|---|
| 1153 | { |
|---|
| 1154 | STBTT_assert(!(o > b->size || o < 0)); |
|---|
| 1155 | b->cursor = (o > b->size || o < 0) ? b->size : o; |
|---|
| 1156 | } |
|---|
| 1157 | |
|---|
| 1158 | static void stbtt__buf_skip(stbtt__buf *b, int o) |
|---|
| 1159 | { |
|---|
| 1160 | stbtt__buf_seek(b, o: b->cursor + o); |
|---|
| 1161 | } |
|---|
| 1162 | |
|---|
| 1163 | static stbtt_uint32 stbtt__buf_get(stbtt__buf *b, int n) |
|---|
| 1164 | { |
|---|
| 1165 | stbtt_uint32 v = 0; |
|---|
| 1166 | int i; |
|---|
| 1167 | STBTT_assert(n >= 1 && n <= 4); |
|---|
| 1168 | for (i = 0; i < n; i++) |
|---|
| 1169 | v = (v << 8) | stbtt__buf_get8(b); |
|---|
| 1170 | return v; |
|---|
| 1171 | } |
|---|
| 1172 | |
|---|
| 1173 | static stbtt__buf stbtt__new_buf(const void *p, size_t size) |
|---|
| 1174 | { |
|---|
| 1175 | stbtt__buf r; |
|---|
| 1176 | STBTT_assert(size < 0x40000000); |
|---|
| 1177 | r.data = (stbtt_uint8*) p; |
|---|
| 1178 | r.size = (int) size; |
|---|
| 1179 | r.cursor = 0; |
|---|
| 1180 | return r; |
|---|
| 1181 | } |
|---|
| 1182 | |
|---|
| 1183 | #define stbtt__buf_get16(b) stbtt__buf_get((b), 2) |
|---|
| 1184 | #define stbtt__buf_get32(b) stbtt__buf_get((b), 4) |
|---|
| 1185 | |
|---|
| 1186 | static stbtt__buf stbtt__buf_range(const stbtt__buf *b, int o, int s) |
|---|
| 1187 | { |
|---|
| 1188 | stbtt__buf r = stbtt__new_buf(NULL, size: 0); |
|---|
| 1189 | if (o < 0 || s < 0 || o > b->size || s > b->size - o) return r; |
|---|
| 1190 | r.data = b->data + o; |
|---|
| 1191 | r.size = s; |
|---|
| 1192 | return r; |
|---|
| 1193 | } |
|---|
| 1194 | |
|---|
| 1195 | static stbtt__buf stbtt__cff_get_index(stbtt__buf *b) |
|---|
| 1196 | { |
|---|
| 1197 | int count, start, offsize; |
|---|
| 1198 | start = b->cursor; |
|---|
| 1199 | count = stbtt__buf_get16(b); |
|---|
| 1200 | if (count) { |
|---|
| 1201 | offsize = stbtt__buf_get8(b); |
|---|
| 1202 | STBTT_assert(offsize >= 1 && offsize <= 4); |
|---|
| 1203 | stbtt__buf_skip(b, o: offsize * count); |
|---|
| 1204 | stbtt__buf_skip(b, o: stbtt__buf_get(b, n: offsize) - 1); |
|---|
| 1205 | } |
|---|
| 1206 | return stbtt__buf_range(b, o: start, s: b->cursor - start); |
|---|
| 1207 | } |
|---|
| 1208 | |
|---|
| 1209 | static stbtt_uint32 stbtt__cff_int(stbtt__buf *b) |
|---|
| 1210 | { |
|---|
| 1211 | int b0 = stbtt__buf_get8(b); |
|---|
| 1212 | if (b0 >= 32 && b0 <= 246) return b0 - 139; |
|---|
| 1213 | else if (b0 >= 247 && b0 <= 250) return (b0 - 247)*256 + stbtt__buf_get8(b) + 108; |
|---|
| 1214 | else if (b0 >= 251 && b0 <= 254) return -(b0 - 251)*256 - stbtt__buf_get8(b) - 108; |
|---|
| 1215 | else if (b0 == 28) return stbtt__buf_get16(b); |
|---|
| 1216 | else if (b0 == 29) return stbtt__buf_get32(b); |
|---|
| 1217 | STBTT_assert(0); |
|---|
| 1218 | return 0; |
|---|
| 1219 | } |
|---|
| 1220 | |
|---|
| 1221 | static void stbtt__cff_skip_operand(stbtt__buf *b) { |
|---|
| 1222 | int v, b0 = stbtt__buf_peek8(b); |
|---|
| 1223 | STBTT_assert(b0 >= 28); |
|---|
| 1224 | if (b0 == 30) { |
|---|
| 1225 | stbtt__buf_skip(b, o: 1); |
|---|
| 1226 | while (b->cursor < b->size) { |
|---|
| 1227 | v = stbtt__buf_get8(b); |
|---|
| 1228 | if ((v & 0xF) == 0xF || (v >> 4) == 0xF) |
|---|
| 1229 | break; |
|---|
| 1230 | } |
|---|
| 1231 | } else { |
|---|
| 1232 | stbtt__cff_int(b); |
|---|
| 1233 | } |
|---|
| 1234 | } |
|---|
| 1235 | |
|---|
| 1236 | static stbtt__buf stbtt__dict_get(stbtt__buf *b, int key) |
|---|
| 1237 | { |
|---|
| 1238 | stbtt__buf_seek(b, o: 0); |
|---|
| 1239 | while (b->cursor < b->size) { |
|---|
| 1240 | int start = b->cursor, end, op; |
|---|
| 1241 | while (stbtt__buf_peek8(b) >= 28) |
|---|
| 1242 | stbtt__cff_skip_operand(b); |
|---|
| 1243 | end = b->cursor; |
|---|
| 1244 | op = stbtt__buf_get8(b); |
|---|
| 1245 | if (op == 12) op = stbtt__buf_get8(b) | 0x100; |
|---|
| 1246 | if (op == key) return stbtt__buf_range(b, o: start, s: end-start); |
|---|
| 1247 | } |
|---|
| 1248 | return stbtt__buf_range(b, o: 0, s: 0); |
|---|
| 1249 | } |
|---|
| 1250 | |
|---|
| 1251 | static void stbtt__dict_get_ints(stbtt__buf *b, int key, int outcount, stbtt_uint32 *out) |
|---|
| 1252 | { |
|---|
| 1253 | int i; |
|---|
| 1254 | stbtt__buf operands = stbtt__dict_get(b, key); |
|---|
| 1255 | for (i = 0; i < outcount && operands.cursor < operands.size; i++) |
|---|
| 1256 | out[i] = stbtt__cff_int(b: &operands); |
|---|
| 1257 | } |
|---|
| 1258 | |
|---|
| 1259 | static int stbtt__cff_index_count(stbtt__buf *b) |
|---|
| 1260 | { |
|---|
| 1261 | stbtt__buf_seek(b, o: 0); |
|---|
| 1262 | return stbtt__buf_get16(b); |
|---|
| 1263 | } |
|---|
| 1264 | |
|---|
| 1265 | static stbtt__buf stbtt__cff_index_get(stbtt__buf b, int i) |
|---|
| 1266 | { |
|---|
| 1267 | int count, offsize, start, end; |
|---|
| 1268 | stbtt__buf_seek(b: &b, o: 0); |
|---|
| 1269 | count = stbtt__buf_get16(&b); |
|---|
| 1270 | offsize = stbtt__buf_get8(b: &b); |
|---|
| 1271 | STBTT_assert(i >= 0 && i < count); |
|---|
| 1272 | STBTT_assert(offsize >= 1 && offsize <= 4); |
|---|
| 1273 | stbtt__buf_skip(b: &b, o: i*offsize); |
|---|
| 1274 | start = stbtt__buf_get(b: &b, n: offsize); |
|---|
| 1275 | end = stbtt__buf_get(b: &b, n: offsize); |
|---|
| 1276 | return stbtt__buf_range(b: &b, o: 2+(count+1)*offsize+start, s: end - start); |
|---|
| 1277 | } |
|---|
| 1278 | |
|---|
| 1279 | ////////////////////////////////////////////////////////////////////////// |
|---|
| 1280 | // |
|---|
| 1281 | // accessors to parse data from file |
|---|
| 1282 | // |
|---|
| 1283 | |
|---|
| 1284 | // on platforms that don't allow misaligned reads, if we want to allow |
|---|
| 1285 | // truetype fonts that aren't padded to alignment, define ALLOW_UNALIGNED_TRUETYPE |
|---|
| 1286 | |
|---|
| 1287 | #define ttBYTE(p) (* (stbtt_uint8 *) (p)) |
|---|
| 1288 | #define ttCHAR(p) (* (stbtt_int8 *) (p)) |
|---|
| 1289 | #define ttFixed(p) ttLONG(p) |
|---|
| 1290 | |
|---|
| 1291 | static stbtt_uint16 ttUSHORT(stbtt_uint8 *p) { return p[0]*256 + p[1]; } |
|---|
| 1292 | static stbtt_int16 ttSHORT(stbtt_uint8 *p) { return p[0]*256 + p[1]; } |
|---|
| 1293 | static stbtt_uint32 ttULONG(stbtt_uint8 *p) { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; } |
|---|
| 1294 | static stbtt_int32 ttLONG(stbtt_uint8 *p) { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; } |
|---|
| 1295 | |
|---|
| 1296 | #define stbtt_tag4(p,c0,c1,c2,c3) ((p)[0] == (c0) && (p)[1] == (c1) && (p)[2] == (c2) && (p)[3] == (c3)) |
|---|
| 1297 | #define stbtt_tag(p,str) stbtt_tag4(p,str[0],str[1],str[2],str[3]) |
|---|
| 1298 | |
|---|
| 1299 | static int stbtt__isfont(stbtt_uint8 *font) |
|---|
| 1300 | { |
|---|
| 1301 | // check the version number |
|---|
| 1302 | if (stbtt_tag4(font, '1',0,0,0)) return 1; // TrueType 1 |
|---|
| 1303 | if (stbtt_tag(font, "typ1" )) return 1; // TrueType with type 1 font -- we don't support this! |
|---|
| 1304 | if (stbtt_tag(font, "OTTO" )) return 1; // OpenType with CFF |
|---|
| 1305 | if (stbtt_tag4(font, 0,1,0,0)) return 1; // OpenType 1.0 |
|---|
| 1306 | if (stbtt_tag(font, "true" )) return 1; // Apple specification for TrueType fonts |
|---|
| 1307 | return 0; |
|---|
| 1308 | } |
|---|
| 1309 | |
|---|
| 1310 | // @OPTIMIZE: binary search |
|---|
| 1311 | static stbtt_uint32 stbtt__find_table(stbtt_uint8 *data, stbtt_uint32 fontstart, const char *tag) |
|---|
| 1312 | { |
|---|
| 1313 | stbtt_int32 num_tables = ttUSHORT(p: data+fontstart+4); |
|---|
| 1314 | stbtt_uint32 tabledir = fontstart + 12; |
|---|
| 1315 | stbtt_int32 i; |
|---|
| 1316 | for (i=0; i < num_tables; ++i) { |
|---|
| 1317 | stbtt_uint32 loc = tabledir + 16*i; |
|---|
| 1318 | if (stbtt_tag(data+loc+0, tag)) |
|---|
| 1319 | return ttULONG(p: data+loc+8); |
|---|
| 1320 | } |
|---|
| 1321 | return 0; |
|---|
| 1322 | } |
|---|
| 1323 | |
|---|
| 1324 | static int stbtt_GetFontOffsetForIndex_internal(unsigned char *font_collection, int index) |
|---|
| 1325 | { |
|---|
| 1326 | // if it's just a font, there's only one valid index |
|---|
| 1327 | if (stbtt__isfont(font: font_collection)) |
|---|
| 1328 | return index == 0 ? 0 : -1; |
|---|
| 1329 | |
|---|
| 1330 | // check if it's a TTC |
|---|
| 1331 | if (stbtt_tag(font_collection, "ttcf" )) { |
|---|
| 1332 | // version 1? |
|---|
| 1333 | if (ttULONG(p: font_collection+4) == 0x00010000 || ttULONG(p: font_collection+4) == 0x00020000) { |
|---|
| 1334 | stbtt_int32 n = ttLONG(p: font_collection+8); |
|---|
| 1335 | if (index >= n) |
|---|
| 1336 | return -1; |
|---|
| 1337 | return ttULONG(p: font_collection+12+index*4); |
|---|
| 1338 | } |
|---|
| 1339 | } |
|---|
| 1340 | return -1; |
|---|
| 1341 | } |
|---|
| 1342 | |
|---|
| 1343 | static int stbtt_GetNumberOfFonts_internal(unsigned char *font_collection) |
|---|
| 1344 | { |
|---|
| 1345 | // if it's just a font, there's only one valid font |
|---|
| 1346 | if (stbtt__isfont(font: font_collection)) |
|---|
| 1347 | return 1; |
|---|
| 1348 | |
|---|
| 1349 | // check if it's a TTC |
|---|
| 1350 | if (stbtt_tag(font_collection, "ttcf" )) { |
|---|
| 1351 | // version 1? |
|---|
| 1352 | if (ttULONG(p: font_collection+4) == 0x00010000 || ttULONG(p: font_collection+4) == 0x00020000) { |
|---|
| 1353 | return ttLONG(p: font_collection+8); |
|---|
| 1354 | } |
|---|
| 1355 | } |
|---|
| 1356 | return 0; |
|---|
| 1357 | } |
|---|
| 1358 | |
|---|
| 1359 | static stbtt__buf stbtt__get_subrs(stbtt__buf cff, stbtt__buf fontdict) |
|---|
| 1360 | { |
|---|
| 1361 | stbtt_uint32 subrsoff = 0, private_loc[2] = { 0, 0 }; |
|---|
| 1362 | stbtt__buf pdict; |
|---|
| 1363 | stbtt__dict_get_ints(b: &fontdict, key: 18, outcount: 2, out: private_loc); |
|---|
| 1364 | if (!private_loc[1] || !private_loc[0]) return stbtt__new_buf(NULL, size: 0); |
|---|
| 1365 | pdict = stbtt__buf_range(b: &cff, o: private_loc[1], s: private_loc[0]); |
|---|
| 1366 | stbtt__dict_get_ints(b: &pdict, key: 19, outcount: 1, out: &subrsoff); |
|---|
| 1367 | if (!subrsoff) return stbtt__new_buf(NULL, size: 0); |
|---|
| 1368 | stbtt__buf_seek(b: &cff, o: private_loc[1]+subrsoff); |
|---|
| 1369 | return stbtt__cff_get_index(b: &cff); |
|---|
| 1370 | } |
|---|
| 1371 | |
|---|
| 1372 | // since most people won't use this, find this table the first time it's needed |
|---|
| 1373 | static int stbtt__get_svg(stbtt_fontinfo *info) |
|---|
| 1374 | { |
|---|
| 1375 | stbtt_uint32 t; |
|---|
| 1376 | if (info->svg < 0) { |
|---|
| 1377 | t = stbtt__find_table(data: info->data, fontstart: info->fontstart, tag: "SVG " ); |
|---|
| 1378 | if (t) { |
|---|
| 1379 | stbtt_uint32 offset = ttULONG(p: info->data + t + 2); |
|---|
| 1380 | info->svg = t + offset; |
|---|
| 1381 | } else { |
|---|
| 1382 | info->svg = 0; |
|---|
| 1383 | } |
|---|
| 1384 | } |
|---|
| 1385 | return info->svg; |
|---|
| 1386 | } |
|---|
| 1387 | |
|---|
| 1388 | static int stbtt_InitFont_internal(stbtt_fontinfo *info, unsigned char *data, int fontstart) |
|---|
| 1389 | { |
|---|
| 1390 | stbtt_uint32 cmap, t; |
|---|
| 1391 | stbtt_int32 i,numTables; |
|---|
| 1392 | |
|---|
| 1393 | info->data = data; |
|---|
| 1394 | info->fontstart = fontstart; |
|---|
| 1395 | info->cff = stbtt__new_buf(NULL, size: 0); |
|---|
| 1396 | |
|---|
| 1397 | cmap = stbtt__find_table(data, fontstart, tag: "cmap" ); // required |
|---|
| 1398 | info->loca = stbtt__find_table(data, fontstart, tag: "loca" ); // required |
|---|
| 1399 | info->head = stbtt__find_table(data, fontstart, tag: "head" ); // required |
|---|
| 1400 | info->glyf = stbtt__find_table(data, fontstart, tag: "glyf" ); // required |
|---|
| 1401 | info->hhea = stbtt__find_table(data, fontstart, tag: "hhea" ); // required |
|---|
| 1402 | info->hmtx = stbtt__find_table(data, fontstart, tag: "hmtx" ); // required |
|---|
| 1403 | info->kern = stbtt__find_table(data, fontstart, tag: "kern" ); // not required |
|---|
| 1404 | info->gpos = stbtt__find_table(data, fontstart, tag: "GPOS" ); // not required |
|---|
| 1405 | |
|---|
| 1406 | if (!cmap || !info->head || !info->hhea || !info->hmtx) |
|---|
| 1407 | return 0; |
|---|
| 1408 | if (info->glyf) { |
|---|
| 1409 | // required for truetype |
|---|
| 1410 | if (!info->loca) return 0; |
|---|
| 1411 | } else { |
|---|
| 1412 | // initialization for CFF / Type2 fonts (OTF) |
|---|
| 1413 | stbtt__buf b, topdict, topdictidx; |
|---|
| 1414 | stbtt_uint32 cstype = 2, charstrings = 0, fdarrayoff = 0, fdselectoff = 0; |
|---|
| 1415 | stbtt_uint32 cff; |
|---|
| 1416 | |
|---|
| 1417 | cff = stbtt__find_table(data, fontstart, tag: "CFF " ); |
|---|
| 1418 | if (!cff) return 0; |
|---|
| 1419 | |
|---|
| 1420 | info->fontdicts = stbtt__new_buf(NULL, size: 0); |
|---|
| 1421 | info->fdselect = stbtt__new_buf(NULL, size: 0); |
|---|
| 1422 | |
|---|
| 1423 | // @TODO this should use size from table (not 512MB) |
|---|
| 1424 | info->cff = stbtt__new_buf(p: data+cff, size: 512*1024*1024); |
|---|
| 1425 | b = info->cff; |
|---|
| 1426 | |
|---|
| 1427 | // read the header |
|---|
| 1428 | stbtt__buf_skip(b: &b, o: 2); |
|---|
| 1429 | stbtt__buf_seek(b: &b, o: stbtt__buf_get8(b: &b)); // hdrsize |
|---|
| 1430 | |
|---|
| 1431 | // @TODO the name INDEX could list multiple fonts, |
|---|
| 1432 | // but we just use the first one. |
|---|
| 1433 | stbtt__cff_get_index(b: &b); // name INDEX |
|---|
| 1434 | topdictidx = stbtt__cff_get_index(b: &b); |
|---|
| 1435 | topdict = stbtt__cff_index_get(b: topdictidx, i: 0); |
|---|
| 1436 | stbtt__cff_get_index(b: &b); // string INDEX |
|---|
| 1437 | info->gsubrs = stbtt__cff_get_index(b: &b); |
|---|
| 1438 | |
|---|
| 1439 | stbtt__dict_get_ints(b: &topdict, key: 17, outcount: 1, out: &charstrings); |
|---|
| 1440 | stbtt__dict_get_ints(b: &topdict, key: 0x100 | 6, outcount: 1, out: &cstype); |
|---|
| 1441 | stbtt__dict_get_ints(b: &topdict, key: 0x100 | 36, outcount: 1, out: &fdarrayoff); |
|---|
| 1442 | stbtt__dict_get_ints(b: &topdict, key: 0x100 | 37, outcount: 1, out: &fdselectoff); |
|---|
| 1443 | info->subrs = stbtt__get_subrs(cff: b, fontdict: topdict); |
|---|
| 1444 | |
|---|
| 1445 | // we only support Type 2 charstrings |
|---|
| 1446 | if (cstype != 2) return 0; |
|---|
| 1447 | if (charstrings == 0) return 0; |
|---|
| 1448 | |
|---|
| 1449 | if (fdarrayoff) { |
|---|
| 1450 | // looks like a CID font |
|---|
| 1451 | if (!fdselectoff) return 0; |
|---|
| 1452 | stbtt__buf_seek(b: &b, o: fdarrayoff); |
|---|
| 1453 | info->fontdicts = stbtt__cff_get_index(b: &b); |
|---|
| 1454 | info->fdselect = stbtt__buf_range(b: &b, o: fdselectoff, s: b.size-fdselectoff); |
|---|
| 1455 | } |
|---|
| 1456 | |
|---|
| 1457 | stbtt__buf_seek(b: &b, o: charstrings); |
|---|
| 1458 | info->charstrings = stbtt__cff_get_index(b: &b); |
|---|
| 1459 | } |
|---|
| 1460 | |
|---|
| 1461 | t = stbtt__find_table(data, fontstart, tag: "maxp" ); |
|---|
| 1462 | if (t) |
|---|
| 1463 | info->numGlyphs = ttUSHORT(p: data+t+4); |
|---|
| 1464 | else |
|---|
| 1465 | info->numGlyphs = 0xffff; |
|---|
| 1466 | |
|---|
| 1467 | info->svg = -1; |
|---|
| 1468 | |
|---|
| 1469 | // find a cmap encoding table we understand *now* to avoid searching |
|---|
| 1470 | // later. (todo: could make this installable) |
|---|
| 1471 | // the same regardless of glyph. |
|---|
| 1472 | numTables = ttUSHORT(p: data + cmap + 2); |
|---|
| 1473 | info->index_map = 0; |
|---|
| 1474 | for (i=0; i < numTables; ++i) { |
|---|
| 1475 | stbtt_uint32 encoding_record = cmap + 4 + 8 * i; |
|---|
| 1476 | // find an encoding we understand: |
|---|
| 1477 | switch(ttUSHORT(p: data+encoding_record)) { |
|---|
| 1478 | case STBTT_PLATFORM_ID_MICROSOFT: |
|---|
| 1479 | switch (ttUSHORT(p: data+encoding_record+2)) { |
|---|
| 1480 | case STBTT_MS_EID_UNICODE_BMP: |
|---|
| 1481 | case STBTT_MS_EID_UNICODE_FULL: |
|---|
| 1482 | // MS/Unicode |
|---|
| 1483 | info->index_map = cmap + ttULONG(p: data+encoding_record+4); |
|---|
| 1484 | break; |
|---|
| 1485 | } |
|---|
| 1486 | break; |
|---|
| 1487 | case STBTT_PLATFORM_ID_UNICODE: |
|---|
| 1488 | // Mac/iOS has these |
|---|
| 1489 | // all the encodingIDs are unicode, so we don't bother to check it |
|---|
| 1490 | info->index_map = cmap + ttULONG(p: data+encoding_record+4); |
|---|
| 1491 | break; |
|---|
| 1492 | } |
|---|
| 1493 | } |
|---|
| 1494 | if (info->index_map == 0) |
|---|
| 1495 | return 0; |
|---|
| 1496 | |
|---|
| 1497 | info->indexToLocFormat = ttUSHORT(p: data+info->head + 50); |
|---|
| 1498 | return 1; |
|---|
| 1499 | } |
|---|
| 1500 | |
|---|
| 1501 | STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint) |
|---|
| 1502 | { |
|---|
| 1503 | stbtt_uint8 *data = info->data; |
|---|
| 1504 | stbtt_uint32 index_map = info->index_map; |
|---|
| 1505 | |
|---|
| 1506 | stbtt_uint16 format = ttUSHORT(p: data + index_map + 0); |
|---|
| 1507 | if (format == 0) { // apple byte encoding |
|---|
| 1508 | stbtt_int32 bytes = ttUSHORT(p: data + index_map + 2); |
|---|
| 1509 | if (unicode_codepoint < bytes-6) |
|---|
| 1510 | return ttBYTE(data + index_map + 6 + unicode_codepoint); |
|---|
| 1511 | return 0; |
|---|
| 1512 | } else if (format == 6) { |
|---|
| 1513 | stbtt_uint32 first = ttUSHORT(p: data + index_map + 6); |
|---|
| 1514 | stbtt_uint32 count = ttUSHORT(p: data + index_map + 8); |
|---|
| 1515 | if ((stbtt_uint32) unicode_codepoint >= first && (stbtt_uint32) unicode_codepoint < first+count) |
|---|
| 1516 | return ttUSHORT(p: data + index_map + 10 + (unicode_codepoint - first)*2); |
|---|
| 1517 | return 0; |
|---|
| 1518 | } else if (format == 2) { |
|---|
| 1519 | STBTT_assert(0); // @TODO: high-byte mapping for japanese/chinese/korean |
|---|
| 1520 | return 0; |
|---|
| 1521 | } else if (format == 4) { // standard mapping for windows fonts: binary search collection of ranges |
|---|
| 1522 | stbtt_uint16 segcount = ttUSHORT(p: data+index_map+6) >> 1; |
|---|
| 1523 | stbtt_uint16 searchRange = ttUSHORT(p: data+index_map+8) >> 1; |
|---|
| 1524 | stbtt_uint16 entrySelector = ttUSHORT(p: data+index_map+10); |
|---|
| 1525 | stbtt_uint16 rangeShift = ttUSHORT(p: data+index_map+12) >> 1; |
|---|
| 1526 | |
|---|
| 1527 | // do a binary search of the segments |
|---|
| 1528 | stbtt_uint32 endCount = index_map + 14; |
|---|
| 1529 | stbtt_uint32 search = endCount; |
|---|
| 1530 | |
|---|
| 1531 | if (unicode_codepoint > 0xffff) |
|---|
| 1532 | return 0; |
|---|
| 1533 | |
|---|
| 1534 | // they lie from endCount .. endCount + segCount |
|---|
| 1535 | // but searchRange is the nearest power of two, so... |
|---|
| 1536 | if (unicode_codepoint >= ttUSHORT(p: data + search + rangeShift*2)) |
|---|
| 1537 | search += rangeShift*2; |
|---|
| 1538 | |
|---|
| 1539 | // now decrement to bias correctly to find smallest |
|---|
| 1540 | search -= 2; |
|---|
| 1541 | while (entrySelector) { |
|---|
| 1542 | stbtt_uint16 end; |
|---|
| 1543 | searchRange >>= 1; |
|---|
| 1544 | end = ttUSHORT(p: data + search + searchRange*2); |
|---|
| 1545 | if (unicode_codepoint > end) |
|---|
| 1546 | search += searchRange*2; |
|---|
| 1547 | --entrySelector; |
|---|
| 1548 | } |
|---|
| 1549 | search += 2; |
|---|
| 1550 | |
|---|
| 1551 | { |
|---|
| 1552 | stbtt_uint16 offset, start, last; |
|---|
| 1553 | stbtt_uint16 item = (stbtt_uint16) ((search - endCount) >> 1); |
|---|
| 1554 | |
|---|
| 1555 | start = ttUSHORT(p: data + index_map + 14 + segcount*2 + 2 + 2*item); |
|---|
| 1556 | last = ttUSHORT(p: data + endCount + 2*item); |
|---|
| 1557 | if (unicode_codepoint < start || unicode_codepoint > last) |
|---|
| 1558 | return 0; |
|---|
| 1559 | |
|---|
| 1560 | offset = ttUSHORT(p: data + index_map + 14 + segcount*6 + 2 + 2*item); |
|---|
| 1561 | if (offset == 0) |
|---|
| 1562 | return (stbtt_uint16) (unicode_codepoint + ttSHORT(p: data + index_map + 14 + segcount*4 + 2 + 2*item)); |
|---|
| 1563 | |
|---|
| 1564 | return ttUSHORT(p: data + offset + (unicode_codepoint-start)*2 + index_map + 14 + segcount*6 + 2 + 2*item); |
|---|
| 1565 | } |
|---|
| 1566 | } else if (format == 12 || format == 13) { |
|---|
| 1567 | stbtt_uint32 ngroups = ttULONG(p: data+index_map+12); |
|---|
| 1568 | stbtt_int32 low,high; |
|---|
| 1569 | low = 0; high = (stbtt_int32)ngroups; |
|---|
| 1570 | // Binary search the right group. |
|---|
| 1571 | while (low < high) { |
|---|
| 1572 | stbtt_int32 mid = low + ((high-low) >> 1); // rounds down, so low <= mid < high |
|---|
| 1573 | stbtt_uint32 start_char = ttULONG(p: data+index_map+16+mid*12); |
|---|
| 1574 | stbtt_uint32 end_char = ttULONG(p: data+index_map+16+mid*12+4); |
|---|
| 1575 | if ((stbtt_uint32) unicode_codepoint < start_char) |
|---|
| 1576 | high = mid; |
|---|
| 1577 | else if ((stbtt_uint32) unicode_codepoint > end_char) |
|---|
| 1578 | low = mid+1; |
|---|
| 1579 | else { |
|---|
| 1580 | stbtt_uint32 start_glyph = ttULONG(p: data+index_map+16+mid*12+8); |
|---|
| 1581 | if (format == 12) |
|---|
| 1582 | return start_glyph + unicode_codepoint-start_char; |
|---|
| 1583 | else // format == 13 |
|---|
| 1584 | return start_glyph; |
|---|
| 1585 | } |
|---|
| 1586 | } |
|---|
| 1587 | return 0; // not found |
|---|
| 1588 | } |
|---|
| 1589 | // @TODO |
|---|
| 1590 | STBTT_assert(0); |
|---|
| 1591 | return 0; |
|---|
| 1592 | } |
|---|
| 1593 | |
|---|
| 1594 | STBTT_DEF int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices) |
|---|
| 1595 | { |
|---|
| 1596 | return stbtt_GetGlyphShape(info, glyph_index: stbtt_FindGlyphIndex(info, unicode_codepoint), vertices); |
|---|
| 1597 | } |
|---|
| 1598 | |
|---|
| 1599 | static void stbtt_setvertex(stbtt_vertex *v, stbtt_uint8 type, stbtt_int32 x, stbtt_int32 y, stbtt_int32 cx, stbtt_int32 cy) |
|---|
| 1600 | { |
|---|
| 1601 | v->type = type; |
|---|
| 1602 | v->x = (stbtt_int16) x; |
|---|
| 1603 | v->y = (stbtt_int16) y; |
|---|
| 1604 | v->cx = (stbtt_int16) cx; |
|---|
| 1605 | v->cy = (stbtt_int16) cy; |
|---|
| 1606 | } |
|---|
| 1607 | |
|---|
| 1608 | static int stbtt__GetGlyfOffset(const stbtt_fontinfo *info, int glyph_index) |
|---|
| 1609 | { |
|---|
| 1610 | int g1,g2; |
|---|
| 1611 | |
|---|
| 1612 | STBTT_assert(!info->cff.size); |
|---|
| 1613 | |
|---|
| 1614 | if (glyph_index >= info->numGlyphs) return -1; // glyph index out of range |
|---|
| 1615 | if (info->indexToLocFormat >= 2) return -1; // unknown index->glyph map format |
|---|
| 1616 | |
|---|
| 1617 | if (info->indexToLocFormat == 0) { |
|---|
| 1618 | g1 = info->glyf + ttUSHORT(p: info->data + info->loca + glyph_index * 2) * 2; |
|---|
| 1619 | g2 = info->glyf + ttUSHORT(p: info->data + info->loca + glyph_index * 2 + 2) * 2; |
|---|
| 1620 | } else { |
|---|
| 1621 | g1 = info->glyf + ttULONG (p: info->data + info->loca + glyph_index * 4); |
|---|
| 1622 | g2 = info->glyf + ttULONG (p: info->data + info->loca + glyph_index * 4 + 4); |
|---|
| 1623 | } |
|---|
| 1624 | |
|---|
| 1625 | return g1==g2 ? -1 : g1; // if length is 0, return -1 |
|---|
| 1626 | } |
|---|
| 1627 | |
|---|
| 1628 | static int stbtt__GetGlyphInfoT2(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1); |
|---|
| 1629 | |
|---|
| 1630 | STBTT_DEF int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1) |
|---|
| 1631 | { |
|---|
| 1632 | if (info->cff.size) { |
|---|
| 1633 | stbtt__GetGlyphInfoT2(info, glyph_index, x0, y0, x1, y1); |
|---|
| 1634 | } else { |
|---|
| 1635 | int g = stbtt__GetGlyfOffset(info, glyph_index); |
|---|
| 1636 | if (g < 0) return 0; |
|---|
| 1637 | |
|---|
| 1638 | if (x0) *x0 = ttSHORT(p: info->data + g + 2); |
|---|
| 1639 | if (y0) *y0 = ttSHORT(p: info->data + g + 4); |
|---|
| 1640 | if (x1) *x1 = ttSHORT(p: info->data + g + 6); |
|---|
| 1641 | if (y1) *y1 = ttSHORT(p: info->data + g + 8); |
|---|
| 1642 | } |
|---|
| 1643 | return 1; |
|---|
| 1644 | } |
|---|
| 1645 | |
|---|
| 1646 | STBTT_DEF int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1) |
|---|
| 1647 | { |
|---|
| 1648 | return stbtt_GetGlyphBox(info, glyph_index: stbtt_FindGlyphIndex(info,unicode_codepoint: codepoint), x0,y0,x1,y1); |
|---|
| 1649 | } |
|---|
| 1650 | |
|---|
| 1651 | STBTT_DEF int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index) |
|---|
| 1652 | { |
|---|
| 1653 | stbtt_int16 numberOfContours; |
|---|
| 1654 | int g; |
|---|
| 1655 | if (info->cff.size) |
|---|
| 1656 | return stbtt__GetGlyphInfoT2(info, glyph_index, NULL, NULL, NULL, NULL) == 0; |
|---|
| 1657 | g = stbtt__GetGlyfOffset(info, glyph_index); |
|---|
| 1658 | if (g < 0) return 1; |
|---|
| 1659 | numberOfContours = ttSHORT(p: info->data + g); |
|---|
| 1660 | return numberOfContours == 0; |
|---|
| 1661 | } |
|---|
| 1662 | |
|---|
| 1663 | static int stbtt__close_shape(stbtt_vertex *vertices, int num_vertices, int was_off, int start_off, |
|---|
| 1664 | stbtt_int32 sx, stbtt_int32 sy, stbtt_int32 scx, stbtt_int32 scy, stbtt_int32 cx, stbtt_int32 cy) |
|---|
| 1665 | { |
|---|
| 1666 | if (start_off) { |
|---|
| 1667 | if (was_off) |
|---|
| 1668 | stbtt_setvertex(v: &vertices[num_vertices++], type: STBTT_vcurve, x: (cx+scx)>>1, y: (cy+scy)>>1, cx,cy); |
|---|
| 1669 | stbtt_setvertex(v: &vertices[num_vertices++], type: STBTT_vcurve, x: sx,y: sy,cx: scx,cy: scy); |
|---|
| 1670 | } else { |
|---|
| 1671 | if (was_off) |
|---|
| 1672 | stbtt_setvertex(v: &vertices[num_vertices++], type: STBTT_vcurve,x: sx,y: sy,cx,cy); |
|---|
| 1673 | else |
|---|
| 1674 | stbtt_setvertex(v: &vertices[num_vertices++], type: STBTT_vline,x: sx,y: sy,cx: 0,cy: 0); |
|---|
| 1675 | } |
|---|
| 1676 | return num_vertices; |
|---|
| 1677 | } |
|---|
| 1678 | |
|---|
| 1679 | static int stbtt__GetGlyphShapeTT(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices) |
|---|
| 1680 | { |
|---|
| 1681 | stbtt_int16 numberOfContours; |
|---|
| 1682 | stbtt_uint8 *endPtsOfContours; |
|---|
| 1683 | stbtt_uint8 *data = info->data; |
|---|
| 1684 | stbtt_vertex *vertices=0; |
|---|
| 1685 | int num_vertices=0; |
|---|
| 1686 | int g = stbtt__GetGlyfOffset(info, glyph_index); |
|---|
| 1687 | |
|---|
| 1688 | *pvertices = NULL; |
|---|
| 1689 | |
|---|
| 1690 | if (g < 0) return 0; |
|---|
| 1691 | |
|---|
| 1692 | numberOfContours = ttSHORT(p: data + g); |
|---|
| 1693 | |
|---|
| 1694 | if (numberOfContours > 0) { |
|---|
| 1695 | stbtt_uint8 flags=0,flagcount; |
|---|
| 1696 | stbtt_int32 ins, i,j=0,m,n, next_move, was_off=0, off, start_off=0; |
|---|
| 1697 | stbtt_int32 x,y,cx,cy,sx,sy, scx,scy; |
|---|
| 1698 | stbtt_uint8 *points; |
|---|
| 1699 | endPtsOfContours = (data + g + 10); |
|---|
| 1700 | ins = ttUSHORT(p: data + g + 10 + numberOfContours * 2); |
|---|
| 1701 | points = data + g + 10 + numberOfContours * 2 + 2 + ins; |
|---|
| 1702 | |
|---|
| 1703 | n = 1+ttUSHORT(p: endPtsOfContours + numberOfContours*2-2); |
|---|
| 1704 | |
|---|
| 1705 | m = n + 2*numberOfContours; // a loose bound on how many vertices we might need |
|---|
| 1706 | vertices = (stbtt_vertex *) STBTT_malloc(m * sizeof(vertices[0]), info->userdata); |
|---|
| 1707 | if (vertices == 0) |
|---|
| 1708 | return 0; |
|---|
| 1709 | |
|---|
| 1710 | next_move = 0; |
|---|
| 1711 | flagcount=0; |
|---|
| 1712 | |
|---|
| 1713 | // in first pass, we load uninterpreted data into the allocated array |
|---|
| 1714 | // above, shifted to the end of the array so we won't overwrite it when |
|---|
| 1715 | // we create our final data starting from the front |
|---|
| 1716 | |
|---|
| 1717 | off = m - n; // starting offset for uninterpreted data, regardless of how m ends up being calculated |
|---|
| 1718 | |
|---|
| 1719 | // first load flags |
|---|
| 1720 | |
|---|
| 1721 | for (i=0; i < n; ++i) { |
|---|
| 1722 | if (flagcount == 0) { |
|---|
| 1723 | flags = *points++; |
|---|
| 1724 | if (flags & 8) |
|---|
| 1725 | flagcount = *points++; |
|---|
| 1726 | } else |
|---|
| 1727 | --flagcount; |
|---|
| 1728 | vertices[off+i].type = flags; |
|---|
| 1729 | } |
|---|
| 1730 | |
|---|
| 1731 | // now load x coordinates |
|---|
| 1732 | x=0; |
|---|
| 1733 | for (i=0; i < n; ++i) { |
|---|
| 1734 | flags = vertices[off+i].type; |
|---|
| 1735 | if (flags & 2) { |
|---|
| 1736 | stbtt_int16 dx = *points++; |
|---|
| 1737 | x += (flags & 16) ? dx : -dx; // ??? |
|---|
| 1738 | } else { |
|---|
| 1739 | if (!(flags & 16)) { |
|---|
| 1740 | x = x + (stbtt_int16) (points[0]*256 + points[1]); |
|---|
| 1741 | points += 2; |
|---|
| 1742 | } |
|---|
| 1743 | } |
|---|
| 1744 | vertices[off+i].x = (stbtt_int16) x; |
|---|
| 1745 | } |
|---|
| 1746 | |
|---|
| 1747 | // now load y coordinates |
|---|
| 1748 | y=0; |
|---|
| 1749 | for (i=0; i < n; ++i) { |
|---|
| 1750 | flags = vertices[off+i].type; |
|---|
| 1751 | if (flags & 4) { |
|---|
| 1752 | stbtt_int16 dy = *points++; |
|---|
| 1753 | y += (flags & 32) ? dy : -dy; // ??? |
|---|
| 1754 | } else { |
|---|
| 1755 | if (!(flags & 32)) { |
|---|
| 1756 | y = y + (stbtt_int16) (points[0]*256 + points[1]); |
|---|
| 1757 | points += 2; |
|---|
| 1758 | } |
|---|
| 1759 | } |
|---|
| 1760 | vertices[off+i].y = (stbtt_int16) y; |
|---|
| 1761 | } |
|---|
| 1762 | |
|---|
| 1763 | // now convert them to our format |
|---|
| 1764 | num_vertices=0; |
|---|
| 1765 | sx = sy = cx = cy = scx = scy = 0; |
|---|
| 1766 | for (i=0; i < n; ++i) { |
|---|
| 1767 | flags = vertices[off+i].type; |
|---|
| 1768 | x = (stbtt_int16) vertices[off+i].x; |
|---|
| 1769 | y = (stbtt_int16) vertices[off+i].y; |
|---|
| 1770 | |
|---|
| 1771 | if (next_move == i) { |
|---|
| 1772 | if (i != 0) |
|---|
| 1773 | num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy); |
|---|
| 1774 | |
|---|
| 1775 | // now start the new one |
|---|
| 1776 | start_off = !(flags & 1); |
|---|
| 1777 | if (start_off) { |
|---|
| 1778 | // if we start off with an off-curve point, then when we need to find a point on the curve |
|---|
| 1779 | // where we can start, and we need to save some state for when we wraparound. |
|---|
| 1780 | scx = x; |
|---|
| 1781 | scy = y; |
|---|
| 1782 | if (!(vertices[off+i+1].type & 1)) { |
|---|
| 1783 | // next point is also a curve point, so interpolate an on-point curve |
|---|
| 1784 | sx = (x + (stbtt_int32) vertices[off+i+1].x) >> 1; |
|---|
| 1785 | sy = (y + (stbtt_int32) vertices[off+i+1].y) >> 1; |
|---|
| 1786 | } else { |
|---|
| 1787 | // otherwise just use the next point as our start point |
|---|
| 1788 | sx = (stbtt_int32) vertices[off+i+1].x; |
|---|
| 1789 | sy = (stbtt_int32) vertices[off+i+1].y; |
|---|
| 1790 | ++i; // we're using point i+1 as the starting point, so skip it |
|---|
| 1791 | } |
|---|
| 1792 | } else { |
|---|
| 1793 | sx = x; |
|---|
| 1794 | sy = y; |
|---|
| 1795 | } |
|---|
| 1796 | stbtt_setvertex(v: &vertices[num_vertices++], type: STBTT_vmove,x: sx,y: sy,cx: 0,cy: 0); |
|---|
| 1797 | was_off = 0; |
|---|
| 1798 | next_move = 1 + ttUSHORT(p: endPtsOfContours+j*2); |
|---|
| 1799 | ++j; |
|---|
| 1800 | } else { |
|---|
| 1801 | if (!(flags & 1)) { // if it's a curve |
|---|
| 1802 | if (was_off) // two off-curve control points in a row means interpolate an on-curve midpoint |
|---|
| 1803 | stbtt_setvertex(v: &vertices[num_vertices++], type: STBTT_vcurve, x: (cx+x)>>1, y: (cy+y)>>1, cx, cy); |
|---|
| 1804 | cx = x; |
|---|
| 1805 | cy = y; |
|---|
| 1806 | was_off = 1; |
|---|
| 1807 | } else { |
|---|
| 1808 | if (was_off) |
|---|
| 1809 | stbtt_setvertex(v: &vertices[num_vertices++], type: STBTT_vcurve, x,y, cx, cy); |
|---|
| 1810 | else |
|---|
| 1811 | stbtt_setvertex(v: &vertices[num_vertices++], type: STBTT_vline, x,y,cx: 0,cy: 0); |
|---|
| 1812 | was_off = 0; |
|---|
| 1813 | } |
|---|
| 1814 | } |
|---|
| 1815 | } |
|---|
| 1816 | num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy); |
|---|
| 1817 | } else if (numberOfContours < 0) { |
|---|
| 1818 | // Compound shapes. |
|---|
| 1819 | int more = 1; |
|---|
| 1820 | stbtt_uint8 *comp = data + g + 10; |
|---|
| 1821 | num_vertices = 0; |
|---|
| 1822 | vertices = 0; |
|---|
| 1823 | while (more) { |
|---|
| 1824 | stbtt_uint16 flags, gidx; |
|---|
| 1825 | int comp_num_verts = 0, i; |
|---|
| 1826 | stbtt_vertex *comp_verts = 0, *tmp = 0; |
|---|
| 1827 | float mtx[6] = {1,0,0,1,0,0}, m, n; |
|---|
| 1828 | |
|---|
| 1829 | flags = ttSHORT(p: comp); comp+=2; |
|---|
| 1830 | gidx = ttSHORT(p: comp); comp+=2; |
|---|
| 1831 | |
|---|
| 1832 | if (flags & 2) { // XY values |
|---|
| 1833 | if (flags & 1) { // shorts |
|---|
| 1834 | mtx[4] = ttSHORT(p: comp); comp+=2; |
|---|
| 1835 | mtx[5] = ttSHORT(p: comp); comp+=2; |
|---|
| 1836 | } else { |
|---|
| 1837 | mtx[4] = ttCHAR(comp); comp+=1; |
|---|
| 1838 | mtx[5] = ttCHAR(comp); comp+=1; |
|---|
| 1839 | } |
|---|
| 1840 | } |
|---|
| 1841 | else { |
|---|
| 1842 | // @TODO handle matching point |
|---|
| 1843 | STBTT_assert(0); |
|---|
| 1844 | } |
|---|
| 1845 | if (flags & (1<<3)) { // WE_HAVE_A_SCALE |
|---|
| 1846 | mtx[0] = mtx[3] = ttSHORT(p: comp)/16384.0f; comp+=2; |
|---|
| 1847 | mtx[1] = mtx[2] = 0; |
|---|
| 1848 | } else if (flags & (1<<6)) { // WE_HAVE_AN_X_AND_YSCALE |
|---|
| 1849 | mtx[0] = ttSHORT(p: comp)/16384.0f; comp+=2; |
|---|
| 1850 | mtx[1] = mtx[2] = 0; |
|---|
| 1851 | mtx[3] = ttSHORT(p: comp)/16384.0f; comp+=2; |
|---|
| 1852 | } else if (flags & (1<<7)) { // WE_HAVE_A_TWO_BY_TWO |
|---|
| 1853 | mtx[0] = ttSHORT(p: comp)/16384.0f; comp+=2; |
|---|
| 1854 | mtx[1] = ttSHORT(p: comp)/16384.0f; comp+=2; |
|---|
| 1855 | mtx[2] = ttSHORT(p: comp)/16384.0f; comp+=2; |
|---|
| 1856 | mtx[3] = ttSHORT(p: comp)/16384.0f; comp+=2; |
|---|
| 1857 | } |
|---|
| 1858 | |
|---|
| 1859 | // Find transformation scales. |
|---|
| 1860 | m = (float) STBTT_sqrt(mtx[0]*mtx[0] + mtx[1]*mtx[1]); |
|---|
| 1861 | n = (float) STBTT_sqrt(mtx[2]*mtx[2] + mtx[3]*mtx[3]); |
|---|
| 1862 | |
|---|
| 1863 | // Get indexed glyph. |
|---|
| 1864 | comp_num_verts = stbtt_GetGlyphShape(info, glyph_index: gidx, vertices: &comp_verts); |
|---|
| 1865 | if (comp_num_verts > 0) { |
|---|
| 1866 | // Transform vertices. |
|---|
| 1867 | for (i = 0; i < comp_num_verts; ++i) { |
|---|
| 1868 | stbtt_vertex* v = &comp_verts[i]; |
|---|
| 1869 | stbtt_vertex_type x,y; |
|---|
| 1870 | x=v->x; y=v->y; |
|---|
| 1871 | v->x = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4])); |
|---|
| 1872 | v->y = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5])); |
|---|
| 1873 | x=v->cx; y=v->cy; |
|---|
| 1874 | v->cx = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4])); |
|---|
| 1875 | v->cy = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5])); |
|---|
| 1876 | } |
|---|
| 1877 | // Append vertices. |
|---|
| 1878 | tmp = (stbtt_vertex*)STBTT_malloc((num_vertices+comp_num_verts)*sizeof(stbtt_vertex), info->userdata); |
|---|
| 1879 | if (!tmp) { |
|---|
| 1880 | if (vertices) STBTT_free(vertices, info->userdata); |
|---|
| 1881 | if (comp_verts) STBTT_free(comp_verts, info->userdata); |
|---|
| 1882 | return 0; |
|---|
| 1883 | } |
|---|
| 1884 | if (num_vertices > 0 && vertices) STBTT_memcpy(dest: tmp, src: vertices, n: num_vertices*sizeof(stbtt_vertex)); |
|---|
| 1885 | STBTT_memcpy(dest: tmp+num_vertices, src: comp_verts, n: comp_num_verts*sizeof(stbtt_vertex)); |
|---|
| 1886 | if (vertices) STBTT_free(vertices, info->userdata); |
|---|
| 1887 | vertices = tmp; |
|---|
| 1888 | STBTT_free(comp_verts, info->userdata); |
|---|
| 1889 | num_vertices += comp_num_verts; |
|---|
| 1890 | } |
|---|
| 1891 | // More components ? |
|---|
| 1892 | more = flags & (1<<5); |
|---|
| 1893 | } |
|---|
| 1894 | } else { |
|---|
| 1895 | // numberOfCounters == 0, do nothing |
|---|
| 1896 | } |
|---|
| 1897 | |
|---|
| 1898 | *pvertices = vertices; |
|---|
| 1899 | return num_vertices; |
|---|
| 1900 | } |
|---|
| 1901 | |
|---|
| 1902 | typedef struct |
|---|
| 1903 | { |
|---|
| 1904 | int bounds; |
|---|
| 1905 | int started; |
|---|
| 1906 | float first_x, first_y; |
|---|
| 1907 | float x, y; |
|---|
| 1908 | stbtt_int32 min_x, max_x, min_y, max_y; |
|---|
| 1909 | |
|---|
| 1910 | stbtt_vertex *pvertices; |
|---|
| 1911 | int num_vertices; |
|---|
| 1912 | } stbtt__csctx; |
|---|
| 1913 | |
|---|
| 1914 | #define STBTT__CSCTX_INIT(bounds) {bounds,0, 0,0, 0,0, 0,0,0,0, NULL, 0} |
|---|
| 1915 | |
|---|
| 1916 | static void stbtt__track_vertex(stbtt__csctx *c, stbtt_int32 x, stbtt_int32 y) |
|---|
| 1917 | { |
|---|
| 1918 | if (x > c->max_x || !c->started) c->max_x = x; |
|---|
| 1919 | if (y > c->max_y || !c->started) c->max_y = y; |
|---|
| 1920 | if (x < c->min_x || !c->started) c->min_x = x; |
|---|
| 1921 | if (y < c->min_y || !c->started) c->min_y = y; |
|---|
| 1922 | c->started = 1; |
|---|
| 1923 | } |
|---|
| 1924 | |
|---|
| 1925 | static void stbtt__csctx_v(stbtt__csctx *c, stbtt_uint8 type, stbtt_int32 x, stbtt_int32 y, stbtt_int32 cx, stbtt_int32 cy, stbtt_int32 cx1, stbtt_int32 cy1) |
|---|
| 1926 | { |
|---|
| 1927 | if (c->bounds) { |
|---|
| 1928 | stbtt__track_vertex(c, x, y); |
|---|
| 1929 | if (type == STBTT_vcubic) { |
|---|
| 1930 | stbtt__track_vertex(c, x: cx, y: cy); |
|---|
| 1931 | stbtt__track_vertex(c, x: cx1, y: cy1); |
|---|
| 1932 | } |
|---|
| 1933 | } else { |
|---|
| 1934 | stbtt_setvertex(v: &c->pvertices[c->num_vertices], type, x, y, cx, cy); |
|---|
| 1935 | c->pvertices[c->num_vertices].cx1 = (stbtt_int16) cx1; |
|---|
| 1936 | c->pvertices[c->num_vertices].cy1 = (stbtt_int16) cy1; |
|---|
| 1937 | } |
|---|
| 1938 | c->num_vertices++; |
|---|
| 1939 | } |
|---|
| 1940 | |
|---|
| 1941 | static void stbtt__csctx_close_shape(stbtt__csctx *ctx) |
|---|
| 1942 | { |
|---|
| 1943 | if (ctx->first_x != ctx->x || ctx->first_y != ctx->y) |
|---|
| 1944 | stbtt__csctx_v(c: ctx, type: STBTT_vline, x: (int)ctx->first_x, y: (int)ctx->first_y, cx: 0, cy: 0, cx1: 0, cy1: 0); |
|---|
| 1945 | } |
|---|
| 1946 | |
|---|
| 1947 | static void stbtt__csctx_rmove_to(stbtt__csctx *ctx, float dx, float dy) |
|---|
| 1948 | { |
|---|
| 1949 | stbtt__csctx_close_shape(ctx); |
|---|
| 1950 | ctx->first_x = ctx->x = ctx->x + dx; |
|---|
| 1951 | ctx->first_y = ctx->y = ctx->y + dy; |
|---|
| 1952 | stbtt__csctx_v(c: ctx, type: STBTT_vmove, x: (int)ctx->x, y: (int)ctx->y, cx: 0, cy: 0, cx1: 0, cy1: 0); |
|---|
| 1953 | } |
|---|
| 1954 | |
|---|
| 1955 | static void stbtt__csctx_rline_to(stbtt__csctx *ctx, float dx, float dy) |
|---|
| 1956 | { |
|---|
| 1957 | ctx->x += dx; |
|---|
| 1958 | ctx->y += dy; |
|---|
| 1959 | stbtt__csctx_v(c: ctx, type: STBTT_vline, x: (int)ctx->x, y: (int)ctx->y, cx: 0, cy: 0, cx1: 0, cy1: 0); |
|---|
| 1960 | } |
|---|
| 1961 | |
|---|
| 1962 | static void stbtt__csctx_rccurve_to(stbtt__csctx *ctx, float dx1, float dy1, float dx2, float dy2, float dx3, float dy3) |
|---|
| 1963 | { |
|---|
| 1964 | float cx1 = ctx->x + dx1; |
|---|
| 1965 | float cy1 = ctx->y + dy1; |
|---|
| 1966 | float cx2 = cx1 + dx2; |
|---|
| 1967 | float cy2 = cy1 + dy2; |
|---|
| 1968 | ctx->x = cx2 + dx3; |
|---|
| 1969 | ctx->y = cy2 + dy3; |
|---|
| 1970 | stbtt__csctx_v(c: ctx, type: STBTT_vcubic, x: (int)ctx->x, y: (int)ctx->y, cx: (int)cx1, cy: (int)cy1, cx1: (int)cx2, cy1: (int)cy2); |
|---|
| 1971 | } |
|---|
| 1972 | |
|---|
| 1973 | static stbtt__buf stbtt__get_subr(stbtt__buf idx, int n) |
|---|
| 1974 | { |
|---|
| 1975 | int count = stbtt__cff_index_count(b: &idx); |
|---|
| 1976 | int bias = 107; |
|---|
| 1977 | if (count >= 33900) |
|---|
| 1978 | bias = 32768; |
|---|
| 1979 | else if (count >= 1240) |
|---|
| 1980 | bias = 1131; |
|---|
| 1981 | n += bias; |
|---|
| 1982 | if (n < 0 || n >= count) |
|---|
| 1983 | return stbtt__new_buf(NULL, size: 0); |
|---|
| 1984 | return stbtt__cff_index_get(b: idx, i: n); |
|---|
| 1985 | } |
|---|
| 1986 | |
|---|
| 1987 | static stbtt__buf stbtt__cid_get_glyph_subrs(const stbtt_fontinfo *info, int glyph_index) |
|---|
| 1988 | { |
|---|
| 1989 | stbtt__buf fdselect = info->fdselect; |
|---|
| 1990 | int nranges, start, end, v, fmt, fdselector = -1, i; |
|---|
| 1991 | |
|---|
| 1992 | stbtt__buf_seek(b: &fdselect, o: 0); |
|---|
| 1993 | fmt = stbtt__buf_get8(b: &fdselect); |
|---|
| 1994 | if (fmt == 0) { |
|---|
| 1995 | // untested |
|---|
| 1996 | stbtt__buf_skip(b: &fdselect, o: glyph_index); |
|---|
| 1997 | fdselector = stbtt__buf_get8(b: &fdselect); |
|---|
| 1998 | } else if (fmt == 3) { |
|---|
| 1999 | nranges = stbtt__buf_get16(&fdselect); |
|---|
| 2000 | start = stbtt__buf_get16(&fdselect); |
|---|
| 2001 | for (i = 0; i < nranges; i++) { |
|---|
| 2002 | v = stbtt__buf_get8(b: &fdselect); |
|---|
| 2003 | end = stbtt__buf_get16(&fdselect); |
|---|
| 2004 | if (glyph_index >= start && glyph_index < end) { |
|---|
| 2005 | fdselector = v; |
|---|
| 2006 | break; |
|---|
| 2007 | } |
|---|
| 2008 | start = end; |
|---|
| 2009 | } |
|---|
| 2010 | } |
|---|
| 2011 | if (fdselector == -1) return stbtt__new_buf(NULL, size: 0); // [DEAR IMGUI] fixed, see #6007 and nothings/stb#1422 |
|---|
| 2012 | return stbtt__get_subrs(cff: info->cff, fontdict: stbtt__cff_index_get(b: info->fontdicts, i: fdselector)); |
|---|
| 2013 | } |
|---|
| 2014 | |
|---|
| 2015 | static int stbtt__run_charstring(const stbtt_fontinfo *info, int glyph_index, stbtt__csctx *c) |
|---|
| 2016 | { |
|---|
| 2017 | int = 1, maskbits = 0, subr_stack_height = 0, sp = 0, v, i, b0; |
|---|
| 2018 | int has_subrs = 0, clear_stack; |
|---|
| 2019 | float s[48]; |
|---|
| 2020 | stbtt__buf subr_stack[10], subrs = info->subrs, b; |
|---|
| 2021 | float f; |
|---|
| 2022 | |
|---|
| 2023 | #define STBTT__CSERR(s) (0) |
|---|
| 2024 | |
|---|
| 2025 | // this currently ignores the initial width value, which isn't needed if we have hmtx |
|---|
| 2026 | b = stbtt__cff_index_get(b: info->charstrings, i: glyph_index); |
|---|
| 2027 | while (b.cursor < b.size) { |
|---|
| 2028 | i = 0; |
|---|
| 2029 | clear_stack = 1; |
|---|
| 2030 | b0 = stbtt__buf_get8(b: &b); |
|---|
| 2031 | switch (b0) { |
|---|
| 2032 | // @TODO implement hinting |
|---|
| 2033 | case 0x13: // hintmask |
|---|
| 2034 | case 0x14: // cntrmask |
|---|
| 2035 | if (in_header) |
|---|
| 2036 | maskbits += (sp / 2); // implicit "vstem" |
|---|
| 2037 | in_header = 0; |
|---|
| 2038 | stbtt__buf_skip(b: &b, o: (maskbits + 7) / 8); |
|---|
| 2039 | break; |
|---|
| 2040 | |
|---|
| 2041 | case 0x01: // hstem |
|---|
| 2042 | case 0x03: // vstem |
|---|
| 2043 | case 0x12: // hstemhm |
|---|
| 2044 | case 0x17: // vstemhm |
|---|
| 2045 | maskbits += (sp / 2); |
|---|
| 2046 | break; |
|---|
| 2047 | |
|---|
| 2048 | case 0x15: // rmoveto |
|---|
| 2049 | in_header = 0; |
|---|
| 2050 | if (sp < 2) return STBTT__CSERR("rmoveto stack" ); |
|---|
| 2051 | stbtt__csctx_rmove_to(ctx: c, dx: s[sp-2], dy: s[sp-1]); |
|---|
| 2052 | break; |
|---|
| 2053 | case 0x04: // vmoveto |
|---|
| 2054 | in_header = 0; |
|---|
| 2055 | if (sp < 1) return STBTT__CSERR("vmoveto stack" ); |
|---|
| 2056 | stbtt__csctx_rmove_to(ctx: c, dx: 0, dy: s[sp-1]); |
|---|
| 2057 | break; |
|---|
| 2058 | case 0x16: // hmoveto |
|---|
| 2059 | in_header = 0; |
|---|
| 2060 | if (sp < 1) return STBTT__CSERR("hmoveto stack" ); |
|---|
| 2061 | stbtt__csctx_rmove_to(ctx: c, dx: s[sp-1], dy: 0); |
|---|
| 2062 | break; |
|---|
| 2063 | |
|---|
| 2064 | case 0x05: // rlineto |
|---|
| 2065 | if (sp < 2) return STBTT__CSERR("rlineto stack" ); |
|---|
| 2066 | for (; i + 1 < sp; i += 2) |
|---|
| 2067 | stbtt__csctx_rline_to(ctx: c, dx: s[i], dy: s[i+1]); |
|---|
| 2068 | break; |
|---|
| 2069 | |
|---|
| 2070 | // hlineto/vlineto and vhcurveto/hvcurveto alternate horizontal and vertical |
|---|
| 2071 | // starting from a different place. |
|---|
| 2072 | |
|---|
| 2073 | case 0x07: // vlineto |
|---|
| 2074 | if (sp < 1) return STBTT__CSERR("vlineto stack" ); |
|---|
| 2075 | goto vlineto; |
|---|
| 2076 | case 0x06: // hlineto |
|---|
| 2077 | if (sp < 1) return STBTT__CSERR("hlineto stack" ); |
|---|
| 2078 | for (;;) { |
|---|
| 2079 | if (i >= sp) break; |
|---|
| 2080 | stbtt__csctx_rline_to(ctx: c, dx: s[i], dy: 0); |
|---|
| 2081 | i++; |
|---|
| 2082 | vlineto: |
|---|
| 2083 | if (i >= sp) break; |
|---|
| 2084 | stbtt__csctx_rline_to(ctx: c, dx: 0, dy: s[i]); |
|---|
| 2085 | i++; |
|---|
| 2086 | } |
|---|
| 2087 | break; |
|---|
| 2088 | |
|---|
| 2089 | case 0x1F: // hvcurveto |
|---|
| 2090 | if (sp < 4) return STBTT__CSERR("hvcurveto stack" ); |
|---|
| 2091 | goto hvcurveto; |
|---|
| 2092 | case 0x1E: // vhcurveto |
|---|
| 2093 | if (sp < 4) return STBTT__CSERR("vhcurveto stack" ); |
|---|
| 2094 | for (;;) { |
|---|
| 2095 | if (i + 3 >= sp) break; |
|---|
| 2096 | stbtt__csctx_rccurve_to(ctx: c, dx1: 0, dy1: s[i], dx2: s[i+1], dy2: s[i+2], dx3: s[i+3], dy3: (sp - i == 5) ? s[i + 4] : 0.0f); |
|---|
| 2097 | i += 4; |
|---|
| 2098 | hvcurveto: |
|---|
| 2099 | if (i + 3 >= sp) break; |
|---|
| 2100 | stbtt__csctx_rccurve_to(ctx: c, dx1: s[i], dy1: 0, dx2: s[i+1], dy2: s[i+2], dx3: (sp - i == 5) ? s[i+4] : 0.0f, dy3: s[i+3]); |
|---|
| 2101 | i += 4; |
|---|
| 2102 | } |
|---|
| 2103 | break; |
|---|
| 2104 | |
|---|
| 2105 | case 0x08: // rrcurveto |
|---|
| 2106 | if (sp < 6) return STBTT__CSERR("rcurveline stack" ); |
|---|
| 2107 | for (; i + 5 < sp; i += 6) |
|---|
| 2108 | stbtt__csctx_rccurve_to(ctx: c, dx1: s[i], dy1: s[i+1], dx2: s[i+2], dy2: s[i+3], dx3: s[i+4], dy3: s[i+5]); |
|---|
| 2109 | break; |
|---|
| 2110 | |
|---|
| 2111 | case 0x18: // rcurveline |
|---|
| 2112 | if (sp < 8) return STBTT__CSERR("rcurveline stack" ); |
|---|
| 2113 | for (; i + 5 < sp - 2; i += 6) |
|---|
| 2114 | stbtt__csctx_rccurve_to(ctx: c, dx1: s[i], dy1: s[i+1], dx2: s[i+2], dy2: s[i+3], dx3: s[i+4], dy3: s[i+5]); |
|---|
| 2115 | if (i + 1 >= sp) return STBTT__CSERR("rcurveline stack" ); |
|---|
| 2116 | stbtt__csctx_rline_to(ctx: c, dx: s[i], dy: s[i+1]); |
|---|
| 2117 | break; |
|---|
| 2118 | |
|---|
| 2119 | case 0x19: // rlinecurve |
|---|
| 2120 | if (sp < 8) return STBTT__CSERR("rlinecurve stack" ); |
|---|
| 2121 | for (; i + 1 < sp - 6; i += 2) |
|---|
| 2122 | stbtt__csctx_rline_to(ctx: c, dx: s[i], dy: s[i+1]); |
|---|
| 2123 | if (i + 5 >= sp) return STBTT__CSERR("rlinecurve stack" ); |
|---|
| 2124 | stbtt__csctx_rccurve_to(ctx: c, dx1: s[i], dy1: s[i+1], dx2: s[i+2], dy2: s[i+3], dx3: s[i+4], dy3: s[i+5]); |
|---|
| 2125 | break; |
|---|
| 2126 | |
|---|
| 2127 | case 0x1A: // vvcurveto |
|---|
| 2128 | case 0x1B: // hhcurveto |
|---|
| 2129 | if (sp < 4) return STBTT__CSERR("(vv|hh)curveto stack" ); |
|---|
| 2130 | f = 0.0; |
|---|
| 2131 | if (sp & 1) { f = s[i]; i++; } |
|---|
| 2132 | for (; i + 3 < sp; i += 4) { |
|---|
| 2133 | if (b0 == 0x1B) |
|---|
| 2134 | stbtt__csctx_rccurve_to(ctx: c, dx1: s[i], dy1: f, dx2: s[i+1], dy2: s[i+2], dx3: s[i+3], dy3: 0.0); |
|---|
| 2135 | else |
|---|
| 2136 | stbtt__csctx_rccurve_to(ctx: c, dx1: f, dy1: s[i], dx2: s[i+1], dy2: s[i+2], dx3: 0.0, dy3: s[i+3]); |
|---|
| 2137 | f = 0.0; |
|---|
| 2138 | } |
|---|
| 2139 | break; |
|---|
| 2140 | |
|---|
| 2141 | case 0x0A: // callsubr |
|---|
| 2142 | if (!has_subrs) { |
|---|
| 2143 | if (info->fdselect.size) |
|---|
| 2144 | subrs = stbtt__cid_get_glyph_subrs(info, glyph_index); |
|---|
| 2145 | has_subrs = 1; |
|---|
| 2146 | } |
|---|
| 2147 | // FALLTHROUGH |
|---|
| 2148 | case 0x1D: // callgsubr |
|---|
| 2149 | if (sp < 1) return STBTT__CSERR("call(g|)subr stack" ); |
|---|
| 2150 | v = (int) s[--sp]; |
|---|
| 2151 | if (subr_stack_height >= 10) return STBTT__CSERR("recursion limit" ); |
|---|
| 2152 | subr_stack[subr_stack_height++] = b; |
|---|
| 2153 | b = stbtt__get_subr(idx: b0 == 0x0A ? subrs : info->gsubrs, n: v); |
|---|
| 2154 | if (b.size == 0) return STBTT__CSERR("subr not found" ); |
|---|
| 2155 | b.cursor = 0; |
|---|
| 2156 | clear_stack = 0; |
|---|
| 2157 | break; |
|---|
| 2158 | |
|---|
| 2159 | case 0x0B: // return |
|---|
| 2160 | if (subr_stack_height <= 0) return STBTT__CSERR("return outside subr" ); |
|---|
| 2161 | b = subr_stack[--subr_stack_height]; |
|---|
| 2162 | clear_stack = 0; |
|---|
| 2163 | break; |
|---|
| 2164 | |
|---|
| 2165 | case 0x0E: // endchar |
|---|
| 2166 | stbtt__csctx_close_shape(ctx: c); |
|---|
| 2167 | return 1; |
|---|
| 2168 | |
|---|
| 2169 | case 0x0C: { // two-byte escape |
|---|
| 2170 | float dx1, dx2, dx3, dx4, dx5, dx6, dy1, dy2, dy3, dy4, dy5, dy6; |
|---|
| 2171 | float dx, dy; |
|---|
| 2172 | int b1 = stbtt__buf_get8(b: &b); |
|---|
| 2173 | switch (b1) { |
|---|
| 2174 | // @TODO These "flex" implementations ignore the flex-depth and resolution, |
|---|
| 2175 | // and always draw beziers. |
|---|
| 2176 | case 0x22: // hflex |
|---|
| 2177 | if (sp < 7) return STBTT__CSERR("hflex stack" ); |
|---|
| 2178 | dx1 = s[0]; |
|---|
| 2179 | dx2 = s[1]; |
|---|
| 2180 | dy2 = s[2]; |
|---|
| 2181 | dx3 = s[3]; |
|---|
| 2182 | dx4 = s[4]; |
|---|
| 2183 | dx5 = s[5]; |
|---|
| 2184 | dx6 = s[6]; |
|---|
| 2185 | stbtt__csctx_rccurve_to(ctx: c, dx1, dy1: 0, dx2, dy2, dx3, dy3: 0); |
|---|
| 2186 | stbtt__csctx_rccurve_to(ctx: c, dx1: dx4, dy1: 0, dx2: dx5, dy2: -dy2, dx3: dx6, dy3: 0); |
|---|
| 2187 | break; |
|---|
| 2188 | |
|---|
| 2189 | case 0x23: // flex |
|---|
| 2190 | if (sp < 13) return STBTT__CSERR("flex stack" ); |
|---|
| 2191 | dx1 = s[0]; |
|---|
| 2192 | dy1 = s[1]; |
|---|
| 2193 | dx2 = s[2]; |
|---|
| 2194 | dy2 = s[3]; |
|---|
| 2195 | dx3 = s[4]; |
|---|
| 2196 | dy3 = s[5]; |
|---|
| 2197 | dx4 = s[6]; |
|---|
| 2198 | dy4 = s[7]; |
|---|
| 2199 | dx5 = s[8]; |
|---|
| 2200 | dy5 = s[9]; |
|---|
| 2201 | dx6 = s[10]; |
|---|
| 2202 | dy6 = s[11]; |
|---|
| 2203 | //fd is s[12] |
|---|
| 2204 | stbtt__csctx_rccurve_to(ctx: c, dx1, dy1, dx2, dy2, dx3, dy3); |
|---|
| 2205 | stbtt__csctx_rccurve_to(ctx: c, dx1: dx4, dy1: dy4, dx2: dx5, dy2: dy5, dx3: dx6, dy3: dy6); |
|---|
| 2206 | break; |
|---|
| 2207 | |
|---|
| 2208 | case 0x24: // hflex1 |
|---|
| 2209 | if (sp < 9) return STBTT__CSERR("hflex1 stack" ); |
|---|
| 2210 | dx1 = s[0]; |
|---|
| 2211 | dy1 = s[1]; |
|---|
| 2212 | dx2 = s[2]; |
|---|
| 2213 | dy2 = s[3]; |
|---|
| 2214 | dx3 = s[4]; |
|---|
| 2215 | dx4 = s[5]; |
|---|
| 2216 | dx5 = s[6]; |
|---|
| 2217 | dy5 = s[7]; |
|---|
| 2218 | dx6 = s[8]; |
|---|
| 2219 | stbtt__csctx_rccurve_to(ctx: c, dx1, dy1, dx2, dy2, dx3, dy3: 0); |
|---|
| 2220 | stbtt__csctx_rccurve_to(ctx: c, dx1: dx4, dy1: 0, dx2: dx5, dy2: dy5, dx3: dx6, dy3: -(dy1+dy2+dy5)); |
|---|
| 2221 | break; |
|---|
| 2222 | |
|---|
| 2223 | case 0x25: // flex1 |
|---|
| 2224 | if (sp < 11) return STBTT__CSERR("flex1 stack" ); |
|---|
| 2225 | dx1 = s[0]; |
|---|
| 2226 | dy1 = s[1]; |
|---|
| 2227 | dx2 = s[2]; |
|---|
| 2228 | dy2 = s[3]; |
|---|
| 2229 | dx3 = s[4]; |
|---|
| 2230 | dy3 = s[5]; |
|---|
| 2231 | dx4 = s[6]; |
|---|
| 2232 | dy4 = s[7]; |
|---|
| 2233 | dx5 = s[8]; |
|---|
| 2234 | dy5 = s[9]; |
|---|
| 2235 | dx6 = dy6 = s[10]; |
|---|
| 2236 | dx = dx1+dx2+dx3+dx4+dx5; |
|---|
| 2237 | dy = dy1+dy2+dy3+dy4+dy5; |
|---|
| 2238 | if (STBTT_fabs(dx) > STBTT_fabs(dy)) |
|---|
| 2239 | dy6 = -dy; |
|---|
| 2240 | else |
|---|
| 2241 | dx6 = -dx; |
|---|
| 2242 | stbtt__csctx_rccurve_to(ctx: c, dx1, dy1, dx2, dy2, dx3, dy3); |
|---|
| 2243 | stbtt__csctx_rccurve_to(ctx: c, dx1: dx4, dy1: dy4, dx2: dx5, dy2: dy5, dx3: dx6, dy3: dy6); |
|---|
| 2244 | break; |
|---|
| 2245 | |
|---|
| 2246 | default: |
|---|
| 2247 | return STBTT__CSERR("unimplemented" ); |
|---|
| 2248 | } |
|---|
| 2249 | } break; |
|---|
| 2250 | |
|---|
| 2251 | default: |
|---|
| 2252 | if (b0 != 255 && b0 != 28 && b0 < 32) |
|---|
| 2253 | return STBTT__CSERR("reserved operator" ); |
|---|
| 2254 | |
|---|
| 2255 | // push immediate |
|---|
| 2256 | if (b0 == 255) { |
|---|
| 2257 | f = (float)(stbtt_int32)stbtt__buf_get32(&b) / 0x10000; |
|---|
| 2258 | } else { |
|---|
| 2259 | stbtt__buf_skip(b: &b, o: -1); |
|---|
| 2260 | f = (float)(stbtt_int16)stbtt__cff_int(b: &b); |
|---|
| 2261 | } |
|---|
| 2262 | if (sp >= 48) return STBTT__CSERR("push stack overflow" ); |
|---|
| 2263 | s[sp++] = f; |
|---|
| 2264 | clear_stack = 0; |
|---|
| 2265 | break; |
|---|
| 2266 | } |
|---|
| 2267 | if (clear_stack) sp = 0; |
|---|
| 2268 | } |
|---|
| 2269 | return STBTT__CSERR("no endchar" ); |
|---|
| 2270 | |
|---|
| 2271 | #undef STBTT__CSERR |
|---|
| 2272 | } |
|---|
| 2273 | |
|---|
| 2274 | static int stbtt__GetGlyphShapeT2(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices) |
|---|
| 2275 | { |
|---|
| 2276 | // runs the charstring twice, once to count and once to output (to avoid realloc) |
|---|
| 2277 | stbtt__csctx count_ctx = STBTT__CSCTX_INIT(1); |
|---|
| 2278 | stbtt__csctx output_ctx = STBTT__CSCTX_INIT(0); |
|---|
| 2279 | if (stbtt__run_charstring(info, glyph_index, c: &count_ctx)) { |
|---|
| 2280 | *pvertices = (stbtt_vertex*)STBTT_malloc(count_ctx.num_vertices*sizeof(stbtt_vertex), info->userdata); |
|---|
| 2281 | output_ctx.pvertices = *pvertices; |
|---|
| 2282 | if (stbtt__run_charstring(info, glyph_index, c: &output_ctx)) { |
|---|
| 2283 | STBTT_assert(output_ctx.num_vertices == count_ctx.num_vertices); |
|---|
| 2284 | return output_ctx.num_vertices; |
|---|
| 2285 | } |
|---|
| 2286 | } |
|---|
| 2287 | *pvertices = NULL; |
|---|
| 2288 | return 0; |
|---|
| 2289 | } |
|---|
| 2290 | |
|---|
| 2291 | static int stbtt__GetGlyphInfoT2(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1) |
|---|
| 2292 | { |
|---|
| 2293 | stbtt__csctx c = STBTT__CSCTX_INIT(1); |
|---|
| 2294 | int r = stbtt__run_charstring(info, glyph_index, c: &c); |
|---|
| 2295 | if (x0) *x0 = r ? c.min_x : 0; |
|---|
| 2296 | if (y0) *y0 = r ? c.min_y : 0; |
|---|
| 2297 | if (x1) *x1 = r ? c.max_x : 0; |
|---|
| 2298 | if (y1) *y1 = r ? c.max_y : 0; |
|---|
| 2299 | return r ? c.num_vertices : 0; |
|---|
| 2300 | } |
|---|
| 2301 | |
|---|
| 2302 | STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices) |
|---|
| 2303 | { |
|---|
| 2304 | if (!info->cff.size) |
|---|
| 2305 | return stbtt__GetGlyphShapeTT(info, glyph_index, pvertices); |
|---|
| 2306 | else |
|---|
| 2307 | return stbtt__GetGlyphShapeT2(info, glyph_index, pvertices); |
|---|
| 2308 | } |
|---|
| 2309 | |
|---|
| 2310 | STBTT_DEF void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing) |
|---|
| 2311 | { |
|---|
| 2312 | stbtt_uint16 numOfLongHorMetrics = ttUSHORT(p: info->data+info->hhea + 34); |
|---|
| 2313 | if (glyph_index < numOfLongHorMetrics) { |
|---|
| 2314 | if (advanceWidth) *advanceWidth = ttSHORT(p: info->data + info->hmtx + 4*glyph_index); |
|---|
| 2315 | if (leftSideBearing) *leftSideBearing = ttSHORT(p: info->data + info->hmtx + 4*glyph_index + 2); |
|---|
| 2316 | } else { |
|---|
| 2317 | if (advanceWidth) *advanceWidth = ttSHORT(p: info->data + info->hmtx + 4*(numOfLongHorMetrics-1)); |
|---|
| 2318 | if (leftSideBearing) *leftSideBearing = ttSHORT(p: info->data + info->hmtx + 4*numOfLongHorMetrics + 2*(glyph_index - numOfLongHorMetrics)); |
|---|
| 2319 | } |
|---|
| 2320 | } |
|---|
| 2321 | |
|---|
| 2322 | STBTT_DEF int stbtt_GetKerningTableLength(const stbtt_fontinfo *info) |
|---|
| 2323 | { |
|---|
| 2324 | stbtt_uint8 *data = info->data + info->kern; |
|---|
| 2325 | |
|---|
| 2326 | // we only look at the first table. it must be 'horizontal' and format 0. |
|---|
| 2327 | if (!info->kern) |
|---|
| 2328 | return 0; |
|---|
| 2329 | if (ttUSHORT(p: data+2) < 1) // number of tables, need at least 1 |
|---|
| 2330 | return 0; |
|---|
| 2331 | if (ttUSHORT(p: data+8) != 1) // horizontal flag must be set in format |
|---|
| 2332 | return 0; |
|---|
| 2333 | |
|---|
| 2334 | return ttUSHORT(p: data+10); |
|---|
| 2335 | } |
|---|
| 2336 | |
|---|
| 2337 | STBTT_DEF int stbtt_GetKerningTable(const stbtt_fontinfo *info, stbtt_kerningentry* table, int table_length) |
|---|
| 2338 | { |
|---|
| 2339 | stbtt_uint8 *data = info->data + info->kern; |
|---|
| 2340 | int k, length; |
|---|
| 2341 | |
|---|
| 2342 | // we only look at the first table. it must be 'horizontal' and format 0. |
|---|
| 2343 | if (!info->kern) |
|---|
| 2344 | return 0; |
|---|
| 2345 | if (ttUSHORT(p: data+2) < 1) // number of tables, need at least 1 |
|---|
| 2346 | return 0; |
|---|
| 2347 | if (ttUSHORT(p: data+8) != 1) // horizontal flag must be set in format |
|---|
| 2348 | return 0; |
|---|
| 2349 | |
|---|
| 2350 | length = ttUSHORT(p: data+10); |
|---|
| 2351 | if (table_length < length) |
|---|
| 2352 | length = table_length; |
|---|
| 2353 | |
|---|
| 2354 | for (k = 0; k < length; k++) |
|---|
| 2355 | { |
|---|
| 2356 | table[k].glyph1 = ttUSHORT(p: data+18+(k*6)); |
|---|
| 2357 | table[k].glyph2 = ttUSHORT(p: data+20+(k*6)); |
|---|
| 2358 | table[k].advance = ttSHORT(p: data+22+(k*6)); |
|---|
| 2359 | } |
|---|
| 2360 | |
|---|
| 2361 | return length; |
|---|
| 2362 | } |
|---|
| 2363 | |
|---|
| 2364 | static int stbtt__GetGlyphKernInfoAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2) |
|---|
| 2365 | { |
|---|
| 2366 | stbtt_uint8 *data = info->data + info->kern; |
|---|
| 2367 | stbtt_uint32 needle, straw; |
|---|
| 2368 | int l, r, m; |
|---|
| 2369 | |
|---|
| 2370 | // we only look at the first table. it must be 'horizontal' and format 0. |
|---|
| 2371 | if (!info->kern) |
|---|
| 2372 | return 0; |
|---|
| 2373 | if (ttUSHORT(p: data+2) < 1) // number of tables, need at least 1 |
|---|
| 2374 | return 0; |
|---|
| 2375 | if (ttUSHORT(p: data+8) != 1) // horizontal flag must be set in format |
|---|
| 2376 | return 0; |
|---|
| 2377 | |
|---|
| 2378 | l = 0; |
|---|
| 2379 | r = ttUSHORT(p: data+10) - 1; |
|---|
| 2380 | needle = glyph1 << 16 | glyph2; |
|---|
| 2381 | while (l <= r) { |
|---|
| 2382 | m = (l + r) >> 1; |
|---|
| 2383 | straw = ttULONG(p: data+18+(m*6)); // note: unaligned read |
|---|
| 2384 | if (needle < straw) |
|---|
| 2385 | r = m - 1; |
|---|
| 2386 | else if (needle > straw) |
|---|
| 2387 | l = m + 1; |
|---|
| 2388 | else |
|---|
| 2389 | return ttSHORT(p: data+22+(m*6)); |
|---|
| 2390 | } |
|---|
| 2391 | return 0; |
|---|
| 2392 | } |
|---|
| 2393 | |
|---|
| 2394 | static stbtt_int32 stbtt__GetCoverageIndex(stbtt_uint8 *coverageTable, int glyph) |
|---|
| 2395 | { |
|---|
| 2396 | stbtt_uint16 coverageFormat = ttUSHORT(p: coverageTable); |
|---|
| 2397 | switch (coverageFormat) { |
|---|
| 2398 | case 1: { |
|---|
| 2399 | stbtt_uint16 glyphCount = ttUSHORT(p: coverageTable + 2); |
|---|
| 2400 | |
|---|
| 2401 | // Binary search. |
|---|
| 2402 | stbtt_int32 l=0, r=glyphCount-1, m; |
|---|
| 2403 | int straw, needle=glyph; |
|---|
| 2404 | while (l <= r) { |
|---|
| 2405 | stbtt_uint8 *glyphArray = coverageTable + 4; |
|---|
| 2406 | stbtt_uint16 glyphID; |
|---|
| 2407 | m = (l + r) >> 1; |
|---|
| 2408 | glyphID = ttUSHORT(p: glyphArray + 2 * m); |
|---|
| 2409 | straw = glyphID; |
|---|
| 2410 | if (needle < straw) |
|---|
| 2411 | r = m - 1; |
|---|
| 2412 | else if (needle > straw) |
|---|
| 2413 | l = m + 1; |
|---|
| 2414 | else { |
|---|
| 2415 | return m; |
|---|
| 2416 | } |
|---|
| 2417 | } |
|---|
| 2418 | break; |
|---|
| 2419 | } |
|---|
| 2420 | |
|---|
| 2421 | case 2: { |
|---|
| 2422 | stbtt_uint16 rangeCount = ttUSHORT(p: coverageTable + 2); |
|---|
| 2423 | stbtt_uint8 *rangeArray = coverageTable + 4; |
|---|
| 2424 | |
|---|
| 2425 | // Binary search. |
|---|
| 2426 | stbtt_int32 l=0, r=rangeCount-1, m; |
|---|
| 2427 | int strawStart, strawEnd, needle=glyph; |
|---|
| 2428 | while (l <= r) { |
|---|
| 2429 | stbtt_uint8 *rangeRecord; |
|---|
| 2430 | m = (l + r) >> 1; |
|---|
| 2431 | rangeRecord = rangeArray + 6 * m; |
|---|
| 2432 | strawStart = ttUSHORT(p: rangeRecord); |
|---|
| 2433 | strawEnd = ttUSHORT(p: rangeRecord + 2); |
|---|
| 2434 | if (needle < strawStart) |
|---|
| 2435 | r = m - 1; |
|---|
| 2436 | else if (needle > strawEnd) |
|---|
| 2437 | l = m + 1; |
|---|
| 2438 | else { |
|---|
| 2439 | stbtt_uint16 startCoverageIndex = ttUSHORT(p: rangeRecord + 4); |
|---|
| 2440 | return startCoverageIndex + glyph - strawStart; |
|---|
| 2441 | } |
|---|
| 2442 | } |
|---|
| 2443 | break; |
|---|
| 2444 | } |
|---|
| 2445 | |
|---|
| 2446 | default: return -1; // unsupported |
|---|
| 2447 | } |
|---|
| 2448 | |
|---|
| 2449 | return -1; |
|---|
| 2450 | } |
|---|
| 2451 | |
|---|
| 2452 | static stbtt_int32 stbtt__GetGlyphClass(stbtt_uint8 *classDefTable, int glyph) |
|---|
| 2453 | { |
|---|
| 2454 | stbtt_uint16 classDefFormat = ttUSHORT(p: classDefTable); |
|---|
| 2455 | switch (classDefFormat) |
|---|
| 2456 | { |
|---|
| 2457 | case 1: { |
|---|
| 2458 | stbtt_uint16 startGlyphID = ttUSHORT(p: classDefTable + 2); |
|---|
| 2459 | stbtt_uint16 glyphCount = ttUSHORT(p: classDefTable + 4); |
|---|
| 2460 | stbtt_uint8 *classDef1ValueArray = classDefTable + 6; |
|---|
| 2461 | |
|---|
| 2462 | if (glyph >= startGlyphID && glyph < startGlyphID + glyphCount) |
|---|
| 2463 | return (stbtt_int32)ttUSHORT(p: classDef1ValueArray + 2 * (glyph - startGlyphID)); |
|---|
| 2464 | break; |
|---|
| 2465 | } |
|---|
| 2466 | |
|---|
| 2467 | case 2: { |
|---|
| 2468 | stbtt_uint16 classRangeCount = ttUSHORT(p: classDefTable + 2); |
|---|
| 2469 | stbtt_uint8 *classRangeRecords = classDefTable + 4; |
|---|
| 2470 | |
|---|
| 2471 | // Binary search. |
|---|
| 2472 | stbtt_int32 l=0, r=classRangeCount-1, m; |
|---|
| 2473 | int strawStart, strawEnd, needle=glyph; |
|---|
| 2474 | while (l <= r) { |
|---|
| 2475 | stbtt_uint8 *classRangeRecord; |
|---|
| 2476 | m = (l + r) >> 1; |
|---|
| 2477 | classRangeRecord = classRangeRecords + 6 * m; |
|---|
| 2478 | strawStart = ttUSHORT(p: classRangeRecord); |
|---|
| 2479 | strawEnd = ttUSHORT(p: classRangeRecord + 2); |
|---|
| 2480 | if (needle < strawStart) |
|---|
| 2481 | r = m - 1; |
|---|
| 2482 | else if (needle > strawEnd) |
|---|
| 2483 | l = m + 1; |
|---|
| 2484 | else |
|---|
| 2485 | return (stbtt_int32)ttUSHORT(p: classRangeRecord + 4); |
|---|
| 2486 | } |
|---|
| 2487 | break; |
|---|
| 2488 | } |
|---|
| 2489 | |
|---|
| 2490 | default: |
|---|
| 2491 | return -1; // Unsupported definition type, return an error. |
|---|
| 2492 | } |
|---|
| 2493 | |
|---|
| 2494 | // "All glyphs not assigned to a class fall into class 0". (OpenType spec) |
|---|
| 2495 | return 0; |
|---|
| 2496 | } |
|---|
| 2497 | |
|---|
| 2498 | // Define to STBTT_assert(x) if you want to break on unimplemented formats. |
|---|
| 2499 | #define STBTT_GPOS_TODO_assert(x) |
|---|
| 2500 | |
|---|
| 2501 | static stbtt_int32 stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2) |
|---|
| 2502 | { |
|---|
| 2503 | stbtt_uint16 lookupListOffset; |
|---|
| 2504 | stbtt_uint8 *lookupList; |
|---|
| 2505 | stbtt_uint16 lookupCount; |
|---|
| 2506 | stbtt_uint8 *data; |
|---|
| 2507 | stbtt_int32 i, sti; |
|---|
| 2508 | |
|---|
| 2509 | if (!info->gpos) return 0; |
|---|
| 2510 | |
|---|
| 2511 | data = info->data + info->gpos; |
|---|
| 2512 | |
|---|
| 2513 | if (ttUSHORT(p: data+0) != 1) return 0; // Major version 1 |
|---|
| 2514 | if (ttUSHORT(p: data+2) != 0) return 0; // Minor version 0 |
|---|
| 2515 | |
|---|
| 2516 | lookupListOffset = ttUSHORT(p: data+8); |
|---|
| 2517 | lookupList = data + lookupListOffset; |
|---|
| 2518 | lookupCount = ttUSHORT(p: lookupList); |
|---|
| 2519 | |
|---|
| 2520 | for (i=0; i<lookupCount; ++i) { |
|---|
| 2521 | stbtt_uint16 lookupOffset = ttUSHORT(p: lookupList + 2 + 2 * i); |
|---|
| 2522 | stbtt_uint8 *lookupTable = lookupList + lookupOffset; |
|---|
| 2523 | |
|---|
| 2524 | stbtt_uint16 lookupType = ttUSHORT(p: lookupTable); |
|---|
| 2525 | stbtt_uint16 subTableCount = ttUSHORT(p: lookupTable + 4); |
|---|
| 2526 | stbtt_uint8 *subTableOffsets = lookupTable + 6; |
|---|
| 2527 | if (lookupType != 2) // Pair Adjustment Positioning Subtable |
|---|
| 2528 | continue; |
|---|
| 2529 | |
|---|
| 2530 | for (sti=0; sti<subTableCount; sti++) { |
|---|
| 2531 | stbtt_uint16 subtableOffset = ttUSHORT(p: subTableOffsets + 2 * sti); |
|---|
| 2532 | stbtt_uint8 *table = lookupTable + subtableOffset; |
|---|
| 2533 | stbtt_uint16 posFormat = ttUSHORT(p: table); |
|---|
| 2534 | stbtt_uint16 coverageOffset = ttUSHORT(p: table + 2); |
|---|
| 2535 | stbtt_int32 coverageIndex = stbtt__GetCoverageIndex(coverageTable: table + coverageOffset, glyph: glyph1); |
|---|
| 2536 | if (coverageIndex == -1) continue; |
|---|
| 2537 | |
|---|
| 2538 | switch (posFormat) { |
|---|
| 2539 | case 1: { |
|---|
| 2540 | stbtt_int32 l, r, m; |
|---|
| 2541 | int straw, needle; |
|---|
| 2542 | stbtt_uint16 valueFormat1 = ttUSHORT(p: table + 4); |
|---|
| 2543 | stbtt_uint16 valueFormat2 = ttUSHORT(p: table + 6); |
|---|
| 2544 | if (valueFormat1 == 4 && valueFormat2 == 0) { // Support more formats? |
|---|
| 2545 | stbtt_int32 valueRecordPairSizeInBytes = 2; |
|---|
| 2546 | stbtt_uint16 pairSetCount = ttUSHORT(p: table + 8); |
|---|
| 2547 | stbtt_uint16 pairPosOffset = ttUSHORT(p: table + 10 + 2 * coverageIndex); |
|---|
| 2548 | stbtt_uint8 *pairValueTable = table + pairPosOffset; |
|---|
| 2549 | stbtt_uint16 pairValueCount = ttUSHORT(p: pairValueTable); |
|---|
| 2550 | stbtt_uint8 *pairValueArray = pairValueTable + 2; |
|---|
| 2551 | |
|---|
| 2552 | if (coverageIndex >= pairSetCount) return 0; |
|---|
| 2553 | |
|---|
| 2554 | needle=glyph2; |
|---|
| 2555 | r=pairValueCount-1; |
|---|
| 2556 | l=0; |
|---|
| 2557 | |
|---|
| 2558 | // Binary search. |
|---|
| 2559 | while (l <= r) { |
|---|
| 2560 | stbtt_uint16 secondGlyph; |
|---|
| 2561 | stbtt_uint8 *pairValue; |
|---|
| 2562 | m = (l + r) >> 1; |
|---|
| 2563 | pairValue = pairValueArray + (2 + valueRecordPairSizeInBytes) * m; |
|---|
| 2564 | secondGlyph = ttUSHORT(p: pairValue); |
|---|
| 2565 | straw = secondGlyph; |
|---|
| 2566 | if (needle < straw) |
|---|
| 2567 | r = m - 1; |
|---|
| 2568 | else if (needle > straw) |
|---|
| 2569 | l = m + 1; |
|---|
| 2570 | else { |
|---|
| 2571 | stbtt_int16 xAdvance = ttSHORT(p: pairValue + 2); |
|---|
| 2572 | return xAdvance; |
|---|
| 2573 | } |
|---|
| 2574 | } |
|---|
| 2575 | } else |
|---|
| 2576 | return 0; |
|---|
| 2577 | break; |
|---|
| 2578 | } |
|---|
| 2579 | |
|---|
| 2580 | case 2: { |
|---|
| 2581 | stbtt_uint16 valueFormat1 = ttUSHORT(p: table + 4); |
|---|
| 2582 | stbtt_uint16 valueFormat2 = ttUSHORT(p: table + 6); |
|---|
| 2583 | if (valueFormat1 == 4 && valueFormat2 == 0) { // Support more formats? |
|---|
| 2584 | stbtt_uint16 classDef1Offset = ttUSHORT(p: table + 8); |
|---|
| 2585 | stbtt_uint16 classDef2Offset = ttUSHORT(p: table + 10); |
|---|
| 2586 | int glyph1class = stbtt__GetGlyphClass(classDefTable: table + classDef1Offset, glyph: glyph1); |
|---|
| 2587 | int glyph2class = stbtt__GetGlyphClass(classDefTable: table + classDef2Offset, glyph: glyph2); |
|---|
| 2588 | |
|---|
| 2589 | stbtt_uint16 class1Count = ttUSHORT(p: table + 12); |
|---|
| 2590 | stbtt_uint16 class2Count = ttUSHORT(p: table + 14); |
|---|
| 2591 | stbtt_uint8 *class1Records, *class2Records; |
|---|
| 2592 | stbtt_int16 xAdvance; |
|---|
| 2593 | |
|---|
| 2594 | if (glyph1class < 0 || glyph1class >= class1Count) return 0; // malformed |
|---|
| 2595 | if (glyph2class < 0 || glyph2class >= class2Count) return 0; // malformed |
|---|
| 2596 | |
|---|
| 2597 | class1Records = table + 16; |
|---|
| 2598 | class2Records = class1Records + 2 * (glyph1class * class2Count); |
|---|
| 2599 | xAdvance = ttSHORT(p: class2Records + 2 * glyph2class); |
|---|
| 2600 | return xAdvance; |
|---|
| 2601 | } else |
|---|
| 2602 | return 0; |
|---|
| 2603 | break; |
|---|
| 2604 | } |
|---|
| 2605 | |
|---|
| 2606 | default: |
|---|
| 2607 | return 0; // Unsupported position format |
|---|
| 2608 | } |
|---|
| 2609 | } |
|---|
| 2610 | } |
|---|
| 2611 | |
|---|
| 2612 | return 0; |
|---|
| 2613 | } |
|---|
| 2614 | |
|---|
| 2615 | STBTT_DEF int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int g1, int g2) |
|---|
| 2616 | { |
|---|
| 2617 | int xAdvance = 0; |
|---|
| 2618 | |
|---|
| 2619 | if (info->gpos) |
|---|
| 2620 | xAdvance += stbtt__GetGlyphGPOSInfoAdvance(info, glyph1: g1, glyph2: g2); |
|---|
| 2621 | else if (info->kern) |
|---|
| 2622 | xAdvance += stbtt__GetGlyphKernInfoAdvance(info, glyph1: g1, glyph2: g2); |
|---|
| 2623 | |
|---|
| 2624 | return xAdvance; |
|---|
| 2625 | } |
|---|
| 2626 | |
|---|
| 2627 | STBTT_DEF int stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2) |
|---|
| 2628 | { |
|---|
| 2629 | if (!info->kern && !info->gpos) // if no kerning table, don't waste time looking up both codepoint->glyphs |
|---|
| 2630 | return 0; |
|---|
| 2631 | return stbtt_GetGlyphKernAdvance(info, g1: stbtt_FindGlyphIndex(info,unicode_codepoint: ch1), g2: stbtt_FindGlyphIndex(info,unicode_codepoint: ch2)); |
|---|
| 2632 | } |
|---|
| 2633 | |
|---|
| 2634 | STBTT_DEF void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing) |
|---|
| 2635 | { |
|---|
| 2636 | stbtt_GetGlyphHMetrics(info, glyph_index: stbtt_FindGlyphIndex(info,unicode_codepoint: codepoint), advanceWidth, leftSideBearing); |
|---|
| 2637 | } |
|---|
| 2638 | |
|---|
| 2639 | STBTT_DEF void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap) |
|---|
| 2640 | { |
|---|
| 2641 | if (ascent ) *ascent = ttSHORT(p: info->data+info->hhea + 4); |
|---|
| 2642 | if (descent) *descent = ttSHORT(p: info->data+info->hhea + 6); |
|---|
| 2643 | if (lineGap) *lineGap = ttSHORT(p: info->data+info->hhea + 8); |
|---|
| 2644 | } |
|---|
| 2645 | |
|---|
| 2646 | STBTT_DEF int stbtt_GetFontVMetricsOS2(const stbtt_fontinfo *info, int *typoAscent, int *typoDescent, int *typoLineGap) |
|---|
| 2647 | { |
|---|
| 2648 | int tab = stbtt__find_table(data: info->data, fontstart: info->fontstart, tag: "OS/2" ); |
|---|
| 2649 | if (!tab) |
|---|
| 2650 | return 0; |
|---|
| 2651 | if (typoAscent ) *typoAscent = ttSHORT(p: info->data+tab + 68); |
|---|
| 2652 | if (typoDescent) *typoDescent = ttSHORT(p: info->data+tab + 70); |
|---|
| 2653 | if (typoLineGap) *typoLineGap = ttSHORT(p: info->data+tab + 72); |
|---|
| 2654 | return 1; |
|---|
| 2655 | } |
|---|
| 2656 | |
|---|
| 2657 | STBTT_DEF void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1) |
|---|
| 2658 | { |
|---|
| 2659 | *x0 = ttSHORT(p: info->data + info->head + 36); |
|---|
| 2660 | *y0 = ttSHORT(p: info->data + info->head + 38); |
|---|
| 2661 | *x1 = ttSHORT(p: info->data + info->head + 40); |
|---|
| 2662 | *y1 = ttSHORT(p: info->data + info->head + 42); |
|---|
| 2663 | } |
|---|
| 2664 | |
|---|
| 2665 | STBTT_DEF float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float height) |
|---|
| 2666 | { |
|---|
| 2667 | int fheight = ttSHORT(p: info->data + info->hhea + 4) - ttSHORT(p: info->data + info->hhea + 6); |
|---|
| 2668 | return (float) height / fheight; |
|---|
| 2669 | } |
|---|
| 2670 | |
|---|
| 2671 | STBTT_DEF float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels) |
|---|
| 2672 | { |
|---|
| 2673 | int unitsPerEm = ttUSHORT(p: info->data + info->head + 18); |
|---|
| 2674 | return pixels / unitsPerEm; |
|---|
| 2675 | } |
|---|
| 2676 | |
|---|
| 2677 | STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *v) |
|---|
| 2678 | { |
|---|
| 2679 | STBTT_free(v, info->userdata); |
|---|
| 2680 | } |
|---|
| 2681 | |
|---|
| 2682 | STBTT_DEF stbtt_uint8 *stbtt_FindSVGDoc(const stbtt_fontinfo *info, int gl) |
|---|
| 2683 | { |
|---|
| 2684 | int i; |
|---|
| 2685 | stbtt_uint8 *data = info->data; |
|---|
| 2686 | stbtt_uint8 *svg_doc_list = data + stbtt__get_svg(info: (stbtt_fontinfo *) info); |
|---|
| 2687 | |
|---|
| 2688 | int numEntries = ttUSHORT(p: svg_doc_list); |
|---|
| 2689 | stbtt_uint8 *svg_docs = svg_doc_list + 2; |
|---|
| 2690 | |
|---|
| 2691 | for(i=0; i<numEntries; i++) { |
|---|
| 2692 | stbtt_uint8 *svg_doc = svg_docs + (12 * i); |
|---|
| 2693 | if ((gl >= ttUSHORT(p: svg_doc)) && (gl <= ttUSHORT(p: svg_doc + 2))) |
|---|
| 2694 | return svg_doc; |
|---|
| 2695 | } |
|---|
| 2696 | return 0; |
|---|
| 2697 | } |
|---|
| 2698 | |
|---|
| 2699 | STBTT_DEF int stbtt_GetGlyphSVG(const stbtt_fontinfo *info, int gl, const char **svg) |
|---|
| 2700 | { |
|---|
| 2701 | stbtt_uint8 *data = info->data; |
|---|
| 2702 | stbtt_uint8 *svg_doc; |
|---|
| 2703 | |
|---|
| 2704 | if (info->svg == 0) |
|---|
| 2705 | return 0; |
|---|
| 2706 | |
|---|
| 2707 | svg_doc = stbtt_FindSVGDoc(info, gl); |
|---|
| 2708 | if (svg_doc != NULL) { |
|---|
| 2709 | *svg = (char *) data + info->svg + ttULONG(p: svg_doc + 4); |
|---|
| 2710 | return ttULONG(p: svg_doc + 8); |
|---|
| 2711 | } else { |
|---|
| 2712 | return 0; |
|---|
| 2713 | } |
|---|
| 2714 | } |
|---|
| 2715 | |
|---|
| 2716 | STBTT_DEF int stbtt_GetCodepointSVG(const stbtt_fontinfo *info, int unicode_codepoint, const char **svg) |
|---|
| 2717 | { |
|---|
| 2718 | return stbtt_GetGlyphSVG(info, gl: stbtt_FindGlyphIndex(info, unicode_codepoint), svg); |
|---|
| 2719 | } |
|---|
| 2720 | |
|---|
| 2721 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 2722 | // |
|---|
| 2723 | // antialiasing software rasterizer |
|---|
| 2724 | // |
|---|
| 2725 | |
|---|
| 2726 | STBTT_DEF void stbtt_GetGlyphBitmapBoxSubpixel(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y,float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1) |
|---|
| 2727 | { |
|---|
| 2728 | int x0=0,y0=0,x1,y1; // =0 suppresses compiler warning |
|---|
| 2729 | if (!stbtt_GetGlyphBox(info: font, glyph_index: glyph, x0: &x0,y0: &y0,x1: &x1,y1: &y1)) { |
|---|
| 2730 | // e.g. space character |
|---|
| 2731 | if (ix0) *ix0 = 0; |
|---|
| 2732 | if (iy0) *iy0 = 0; |
|---|
| 2733 | if (ix1) *ix1 = 0; |
|---|
| 2734 | if (iy1) *iy1 = 0; |
|---|
| 2735 | } else { |
|---|
| 2736 | // move to integral bboxes (treating pixels as little squares, what pixels get touched)? |
|---|
| 2737 | if (ix0) *ix0 = STBTT_ifloor( x0 * scale_x + shift_x); |
|---|
| 2738 | if (iy0) *iy0 = STBTT_ifloor(-y1 * scale_y + shift_y); |
|---|
| 2739 | if (ix1) *ix1 = STBTT_iceil ( x1 * scale_x + shift_x); |
|---|
| 2740 | if (iy1) *iy1 = STBTT_iceil (-y0 * scale_y + shift_y); |
|---|
| 2741 | } |
|---|
| 2742 | } |
|---|
| 2743 | |
|---|
| 2744 | STBTT_DEF void stbtt_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1) |
|---|
| 2745 | { |
|---|
| 2746 | stbtt_GetGlyphBitmapBoxSubpixel(font, glyph, scale_x, scale_y,shift_x: 0.0f,shift_y: 0.0f, ix0, iy0, ix1, iy1); |
|---|
| 2747 | } |
|---|
| 2748 | |
|---|
| 2749 | STBTT_DEF void stbtt_GetCodepointBitmapBoxSubpixel(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1) |
|---|
| 2750 | { |
|---|
| 2751 | stbtt_GetGlyphBitmapBoxSubpixel(font, glyph: stbtt_FindGlyphIndex(info: font,unicode_codepoint: codepoint), scale_x, scale_y,shift_x,shift_y, ix0,iy0,ix1,iy1); |
|---|
| 2752 | } |
|---|
| 2753 | |
|---|
| 2754 | STBTT_DEF void stbtt_GetCodepointBitmapBox(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1) |
|---|
| 2755 | { |
|---|
| 2756 | stbtt_GetCodepointBitmapBoxSubpixel(font, codepoint, scale_x, scale_y,shift_x: 0.0f,shift_y: 0.0f, ix0,iy0,ix1,iy1); |
|---|
| 2757 | } |
|---|
| 2758 | |
|---|
| 2759 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 2760 | // |
|---|
| 2761 | // Rasterizer |
|---|
| 2762 | |
|---|
| 2763 | typedef struct stbtt__hheap_chunk |
|---|
| 2764 | { |
|---|
| 2765 | struct stbtt__hheap_chunk *next; |
|---|
| 2766 | } stbtt__hheap_chunk; |
|---|
| 2767 | |
|---|
| 2768 | typedef struct stbtt__hheap |
|---|
| 2769 | { |
|---|
| 2770 | struct stbtt__hheap_chunk *head; |
|---|
| 2771 | void *first_free; |
|---|
| 2772 | int num_remaining_in_head_chunk; |
|---|
| 2773 | } stbtt__hheap; |
|---|
| 2774 | |
|---|
| 2775 | static void *stbtt__hheap_alloc(stbtt__hheap *hh, size_t size, void *userdata) |
|---|
| 2776 | { |
|---|
| 2777 | if (hh->first_free) { |
|---|
| 2778 | void *p = hh->first_free; |
|---|
| 2779 | hh->first_free = * (void **) p; |
|---|
| 2780 | return p; |
|---|
| 2781 | } else { |
|---|
| 2782 | if (hh->num_remaining_in_head_chunk == 0) { |
|---|
| 2783 | int count = (size < 32 ? 2000 : size < 128 ? 800 : 100); |
|---|
| 2784 | stbtt__hheap_chunk *c = (stbtt__hheap_chunk *) STBTT_malloc(sizeof(stbtt__hheap_chunk) + size * count, userdata); |
|---|
| 2785 | if (c == NULL) |
|---|
| 2786 | return NULL; |
|---|
| 2787 | c->next = hh->head; |
|---|
| 2788 | hh->head = c; |
|---|
| 2789 | hh->num_remaining_in_head_chunk = count; |
|---|
| 2790 | } |
|---|
| 2791 | --hh->num_remaining_in_head_chunk; |
|---|
| 2792 | return (char *) (hh->head) + sizeof(stbtt__hheap_chunk) + size * hh->num_remaining_in_head_chunk; |
|---|
| 2793 | } |
|---|
| 2794 | } |
|---|
| 2795 | |
|---|
| 2796 | static void stbtt__hheap_free(stbtt__hheap *hh, void *p) |
|---|
| 2797 | { |
|---|
| 2798 | *(void **) p = hh->first_free; |
|---|
| 2799 | hh->first_free = p; |
|---|
| 2800 | } |
|---|
| 2801 | |
|---|
| 2802 | static void stbtt__hheap_cleanup(stbtt__hheap *hh, void *userdata) |
|---|
| 2803 | { |
|---|
| 2804 | stbtt__hheap_chunk *c = hh->head; |
|---|
| 2805 | while (c) { |
|---|
| 2806 | stbtt__hheap_chunk *n = c->next; |
|---|
| 2807 | STBTT_free(c, userdata); |
|---|
| 2808 | c = n; |
|---|
| 2809 | } |
|---|
| 2810 | } |
|---|
| 2811 | |
|---|
| 2812 | typedef struct stbtt__edge { |
|---|
| 2813 | float x0,y0, x1,y1; |
|---|
| 2814 | int invert; |
|---|
| 2815 | } stbtt__edge; |
|---|
| 2816 | |
|---|
| 2817 | |
|---|
| 2818 | typedef struct stbtt__active_edge |
|---|
| 2819 | { |
|---|
| 2820 | struct stbtt__active_edge *next; |
|---|
| 2821 | #if STBTT_RASTERIZER_VERSION==1 |
|---|
| 2822 | int x,dx; |
|---|
| 2823 | float ey; |
|---|
| 2824 | int direction; |
|---|
| 2825 | #elif STBTT_RASTERIZER_VERSION==2 |
|---|
| 2826 | float fx,fdx,fdy; |
|---|
| 2827 | float direction; |
|---|
| 2828 | float sy; |
|---|
| 2829 | float ey; |
|---|
| 2830 | #else |
|---|
| 2831 | #error "Unrecognized value of STBTT_RASTERIZER_VERSION" |
|---|
| 2832 | #endif |
|---|
| 2833 | } stbtt__active_edge; |
|---|
| 2834 | |
|---|
| 2835 | #if STBTT_RASTERIZER_VERSION == 1 |
|---|
| 2836 | #define STBTT_FIXSHIFT 10 |
|---|
| 2837 | #define STBTT_FIX (1 << STBTT_FIXSHIFT) |
|---|
| 2838 | #define STBTT_FIXMASK (STBTT_FIX-1) |
|---|
| 2839 | |
|---|
| 2840 | static stbtt__active_edge *stbtt__new_active(stbtt__hheap *hh, stbtt__edge *e, int off_x, float start_point, void *userdata) |
|---|
| 2841 | { |
|---|
| 2842 | stbtt__active_edge *z = (stbtt__active_edge *) stbtt__hheap_alloc(hh, sizeof(*z), userdata); |
|---|
| 2843 | float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0); |
|---|
| 2844 | STBTT_assert(z != NULL); |
|---|
| 2845 | if (!z) return z; |
|---|
| 2846 | |
|---|
| 2847 | // round dx down to avoid overshooting |
|---|
| 2848 | if (dxdy < 0) |
|---|
| 2849 | z->dx = -STBTT_ifloor(STBTT_FIX * -dxdy); |
|---|
| 2850 | else |
|---|
| 2851 | z->dx = STBTT_ifloor(STBTT_FIX * dxdy); |
|---|
| 2852 | |
|---|
| 2853 | z->x = STBTT_ifloor(STBTT_FIX * e->x0 + z->dx * (start_point - e->y0)); // use z->dx so when we offset later it's by the same amount |
|---|
| 2854 | z->x -= off_x * STBTT_FIX; |
|---|
| 2855 | |
|---|
| 2856 | z->ey = e->y1; |
|---|
| 2857 | z->next = 0; |
|---|
| 2858 | z->direction = e->invert ? 1 : -1; |
|---|
| 2859 | return z; |
|---|
| 2860 | } |
|---|
| 2861 | #elif STBTT_RASTERIZER_VERSION == 2 |
|---|
| 2862 | static stbtt__active_edge *stbtt__new_active(stbtt__hheap *hh, stbtt__edge *e, int off_x, float start_point, void *userdata) |
|---|
| 2863 | { |
|---|
| 2864 | stbtt__active_edge *z = (stbtt__active_edge *) stbtt__hheap_alloc(hh, size: sizeof(*z), userdata); |
|---|
| 2865 | float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0); |
|---|
| 2866 | STBTT_assert(z != NULL); |
|---|
| 2867 | //STBTT_assert(e->y0 <= start_point); |
|---|
| 2868 | if (!z) return z; |
|---|
| 2869 | z->fdx = dxdy; |
|---|
| 2870 | z->fdy = dxdy != 0.0f ? (1.0f/dxdy) : 0.0f; |
|---|
| 2871 | z->fx = e->x0 + dxdy * (start_point - e->y0); |
|---|
| 2872 | z->fx -= off_x; |
|---|
| 2873 | z->direction = e->invert ? 1.0f : -1.0f; |
|---|
| 2874 | z->sy = e->y0; |
|---|
| 2875 | z->ey = e->y1; |
|---|
| 2876 | z->next = 0; |
|---|
| 2877 | return z; |
|---|
| 2878 | } |
|---|
| 2879 | #else |
|---|
| 2880 | #error "Unrecognized value of STBTT_RASTERIZER_VERSION" |
|---|
| 2881 | #endif |
|---|
| 2882 | |
|---|
| 2883 | #if STBTT_RASTERIZER_VERSION == 1 |
|---|
| 2884 | // note: this routine clips fills that extend off the edges... ideally this |
|---|
| 2885 | // wouldn't happen, but it could happen if the truetype glyph bounding boxes |
|---|
| 2886 | // are wrong, or if the user supplies a too-small bitmap |
|---|
| 2887 | static void stbtt__fill_active_edges(unsigned char *scanline, int len, stbtt__active_edge *e, int max_weight) |
|---|
| 2888 | { |
|---|
| 2889 | // non-zero winding fill |
|---|
| 2890 | int x0=0, w=0; |
|---|
| 2891 | |
|---|
| 2892 | while (e) { |
|---|
| 2893 | if (w == 0) { |
|---|
| 2894 | // if we're currently at zero, we need to record the edge start point |
|---|
| 2895 | x0 = e->x; w += e->direction; |
|---|
| 2896 | } else { |
|---|
| 2897 | int x1 = e->x; w += e->direction; |
|---|
| 2898 | // if we went to zero, we need to draw |
|---|
| 2899 | if (w == 0) { |
|---|
| 2900 | int i = x0 >> STBTT_FIXSHIFT; |
|---|
| 2901 | int j = x1 >> STBTT_FIXSHIFT; |
|---|
| 2902 | |
|---|
| 2903 | if (i < len && j >= 0) { |
|---|
| 2904 | if (i == j) { |
|---|
| 2905 | // x0,x1 are the same pixel, so compute combined coverage |
|---|
| 2906 | scanline[i] = scanline[i] + (stbtt_uint8) ((x1 - x0) * max_weight >> STBTT_FIXSHIFT); |
|---|
| 2907 | } else { |
|---|
| 2908 | if (i >= 0) // add antialiasing for x0 |
|---|
| 2909 | scanline[i] = scanline[i] + (stbtt_uint8) (((STBTT_FIX - (x0 & STBTT_FIXMASK)) * max_weight) >> STBTT_FIXSHIFT); |
|---|
| 2910 | else |
|---|
| 2911 | i = -1; // clip |
|---|
| 2912 | |
|---|
| 2913 | if (j < len) // add antialiasing for x1 |
|---|
| 2914 | scanline[j] = scanline[j] + (stbtt_uint8) (((x1 & STBTT_FIXMASK) * max_weight) >> STBTT_FIXSHIFT); |
|---|
| 2915 | else |
|---|
| 2916 | j = len; // clip |
|---|
| 2917 | |
|---|
| 2918 | for (++i; i < j; ++i) // fill pixels between x0 and x1 |
|---|
| 2919 | scanline[i] = scanline[i] + (stbtt_uint8) max_weight; |
|---|
| 2920 | } |
|---|
| 2921 | } |
|---|
| 2922 | } |
|---|
| 2923 | } |
|---|
| 2924 | |
|---|
| 2925 | e = e->next; |
|---|
| 2926 | } |
|---|
| 2927 | } |
|---|
| 2928 | |
|---|
| 2929 | static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e, int n, int vsubsample, int off_x, int off_y, void *userdata) |
|---|
| 2930 | { |
|---|
| 2931 | stbtt__hheap hh = { 0, 0, 0 }; |
|---|
| 2932 | stbtt__active_edge *active = NULL; |
|---|
| 2933 | int y,j=0; |
|---|
| 2934 | int max_weight = (255 / vsubsample); // weight per vertical scanline |
|---|
| 2935 | int s; // vertical subsample index |
|---|
| 2936 | unsigned char scanline_data[512], *scanline; |
|---|
| 2937 | |
|---|
| 2938 | if (result->w > 512) |
|---|
| 2939 | scanline = (unsigned char *) STBTT_malloc(result->w, userdata); |
|---|
| 2940 | else |
|---|
| 2941 | scanline = scanline_data; |
|---|
| 2942 | |
|---|
| 2943 | y = off_y * vsubsample; |
|---|
| 2944 | e[n].y0 = (off_y + result->h) * (float) vsubsample + 1; |
|---|
| 2945 | |
|---|
| 2946 | while (j < result->h) { |
|---|
| 2947 | STBTT_memset(scanline, 0, result->w); |
|---|
| 2948 | for (s=0; s < vsubsample; ++s) { |
|---|
| 2949 | // find center of pixel for this scanline |
|---|
| 2950 | float scan_y = y + 0.5f; |
|---|
| 2951 | stbtt__active_edge **step = &active; |
|---|
| 2952 | |
|---|
| 2953 | // update all active edges; |
|---|
| 2954 | // remove all active edges that terminate before the center of this scanline |
|---|
| 2955 | while (*step) { |
|---|
| 2956 | stbtt__active_edge * z = *step; |
|---|
| 2957 | if (z->ey <= scan_y) { |
|---|
| 2958 | *step = z->next; // delete from list |
|---|
| 2959 | STBTT_assert(z->direction); |
|---|
| 2960 | z->direction = 0; |
|---|
| 2961 | stbtt__hheap_free(&hh, z); |
|---|
| 2962 | } else { |
|---|
| 2963 | z->x += z->dx; // advance to position for current scanline |
|---|
| 2964 | step = &((*step)->next); // advance through list |
|---|
| 2965 | } |
|---|
| 2966 | } |
|---|
| 2967 | |
|---|
| 2968 | // resort the list if needed |
|---|
| 2969 | for(;;) { |
|---|
| 2970 | int changed=0; |
|---|
| 2971 | step = &active; |
|---|
| 2972 | while (*step && (*step)->next) { |
|---|
| 2973 | if ((*step)->x > (*step)->next->x) { |
|---|
| 2974 | stbtt__active_edge *t = *step; |
|---|
| 2975 | stbtt__active_edge *q = t->next; |
|---|
| 2976 | |
|---|
| 2977 | t->next = q->next; |
|---|
| 2978 | q->next = t; |
|---|
| 2979 | *step = q; |
|---|
| 2980 | changed = 1; |
|---|
| 2981 | } |
|---|
| 2982 | step = &(*step)->next; |
|---|
| 2983 | } |
|---|
| 2984 | if (!changed) break; |
|---|
| 2985 | } |
|---|
| 2986 | |
|---|
| 2987 | // insert all edges that start before the center of this scanline -- omit ones that also end on this scanline |
|---|
| 2988 | while (e->y0 <= scan_y) { |
|---|
| 2989 | if (e->y1 > scan_y) { |
|---|
| 2990 | stbtt__active_edge *z = stbtt__new_active(&hh, e, off_x, scan_y, userdata); |
|---|
| 2991 | if (z != NULL) { |
|---|
| 2992 | // find insertion point |
|---|
| 2993 | if (active == NULL) |
|---|
| 2994 | active = z; |
|---|
| 2995 | else if (z->x < active->x) { |
|---|
| 2996 | // insert at front |
|---|
| 2997 | z->next = active; |
|---|
| 2998 | active = z; |
|---|
| 2999 | } else { |
|---|
| 3000 | // find thing to insert AFTER |
|---|
| 3001 | stbtt__active_edge *p = active; |
|---|
| 3002 | while (p->next && p->next->x < z->x) |
|---|
| 3003 | p = p->next; |
|---|
| 3004 | // at this point, p->next->x is NOT < z->x |
|---|
| 3005 | z->next = p->next; |
|---|
| 3006 | p->next = z; |
|---|
| 3007 | } |
|---|
| 3008 | } |
|---|
| 3009 | } |
|---|
| 3010 | ++e; |
|---|
| 3011 | } |
|---|
| 3012 | |
|---|
| 3013 | // now process all active edges in XOR fashion |
|---|
| 3014 | if (active) |
|---|
| 3015 | stbtt__fill_active_edges(scanline, result->w, active, max_weight); |
|---|
| 3016 | |
|---|
| 3017 | ++y; |
|---|
| 3018 | } |
|---|
| 3019 | STBTT_memcpy(result->pixels + j * result->stride, scanline, result->w); |
|---|
| 3020 | ++j; |
|---|
| 3021 | } |
|---|
| 3022 | |
|---|
| 3023 | stbtt__hheap_cleanup(&hh, userdata); |
|---|
| 3024 | |
|---|
| 3025 | if (scanline != scanline_data) |
|---|
| 3026 | STBTT_free(scanline, userdata); |
|---|
| 3027 | } |
|---|
| 3028 | |
|---|
| 3029 | #elif STBTT_RASTERIZER_VERSION == 2 |
|---|
| 3030 | |
|---|
| 3031 | // the edge passed in here does not cross the vertical line at x or the vertical line at x+1 |
|---|
| 3032 | // (i.e. it has already been clipped to those) |
|---|
| 3033 | static void stbtt__handle_clipped_edge(float *scanline, int x, stbtt__active_edge *e, float x0, float y0, float x1, float y1) |
|---|
| 3034 | { |
|---|
| 3035 | if (y0 == y1) return; |
|---|
| 3036 | STBTT_assert(y0 < y1); |
|---|
| 3037 | STBTT_assert(e->sy <= e->ey); |
|---|
| 3038 | if (y0 > e->ey) return; |
|---|
| 3039 | if (y1 < e->sy) return; |
|---|
| 3040 | if (y0 < e->sy) { |
|---|
| 3041 | x0 += (x1-x0) * (e->sy - y0) / (y1-y0); |
|---|
| 3042 | y0 = e->sy; |
|---|
| 3043 | } |
|---|
| 3044 | if (y1 > e->ey) { |
|---|
| 3045 | x1 += (x1-x0) * (e->ey - y1) / (y1-y0); |
|---|
| 3046 | y1 = e->ey; |
|---|
| 3047 | } |
|---|
| 3048 | |
|---|
| 3049 | if (x0 == x) |
|---|
| 3050 | STBTT_assert(x1 <= x+1); |
|---|
| 3051 | else if (x0 == x+1) |
|---|
| 3052 | STBTT_assert(x1 >= x); |
|---|
| 3053 | else if (x0 <= x) |
|---|
| 3054 | STBTT_assert(x1 <= x); |
|---|
| 3055 | else if (x0 >= x+1) |
|---|
| 3056 | STBTT_assert(x1 >= x+1); |
|---|
| 3057 | else |
|---|
| 3058 | STBTT_assert(x1 >= x && x1 <= x+1); |
|---|
| 3059 | |
|---|
| 3060 | if (x0 <= x && x1 <= x) |
|---|
| 3061 | scanline[x] += e->direction * (y1-y0); |
|---|
| 3062 | else if (x0 >= x+1 && x1 >= x+1) |
|---|
| 3063 | ; |
|---|
| 3064 | else { |
|---|
| 3065 | STBTT_assert(x0 >= x && x0 <= x+1 && x1 >= x && x1 <= x+1); |
|---|
| 3066 | scanline[x] += e->direction * (y1-y0) * (1-((x0-x)+(x1-x))/2); // coverage = 1 - average x position |
|---|
| 3067 | } |
|---|
| 3068 | } |
|---|
| 3069 | |
|---|
| 3070 | static float stbtt__sized_trapezoid_area(float height, float top_width, float bottom_width) |
|---|
| 3071 | { |
|---|
| 3072 | STBTT_assert(top_width >= 0); |
|---|
| 3073 | STBTT_assert(bottom_width >= 0); |
|---|
| 3074 | return (top_width + bottom_width) / 2.0f * height; |
|---|
| 3075 | } |
|---|
| 3076 | |
|---|
| 3077 | static float stbtt__position_trapezoid_area(float height, float tx0, float tx1, float bx0, float bx1) |
|---|
| 3078 | { |
|---|
| 3079 | return stbtt__sized_trapezoid_area(height, top_width: tx1 - tx0, bottom_width: bx1 - bx0); |
|---|
| 3080 | } |
|---|
| 3081 | |
|---|
| 3082 | static float stbtt__sized_triangle_area(float height, float width) |
|---|
| 3083 | { |
|---|
| 3084 | return height * width / 2; |
|---|
| 3085 | } |
|---|
| 3086 | |
|---|
| 3087 | static void stbtt__fill_active_edges_new(float *scanline, float *scanline_fill, int len, stbtt__active_edge *e, float y_top) |
|---|
| 3088 | { |
|---|
| 3089 | float y_bottom = y_top+1; |
|---|
| 3090 | |
|---|
| 3091 | while (e) { |
|---|
| 3092 | // brute force every pixel |
|---|
| 3093 | |
|---|
| 3094 | // compute intersection points with top & bottom |
|---|
| 3095 | STBTT_assert(e->ey >= y_top); |
|---|
| 3096 | |
|---|
| 3097 | if (e->fdx == 0) { |
|---|
| 3098 | float x0 = e->fx; |
|---|
| 3099 | if (x0 < len) { |
|---|
| 3100 | if (x0 >= 0) { |
|---|
| 3101 | stbtt__handle_clipped_edge(scanline,x: (int) x0,e, x0,y0: y_top, x1: x0,y1: y_bottom); |
|---|
| 3102 | stbtt__handle_clipped_edge(scanline: scanline_fill-1,x: (int) x0+1,e, x0,y0: y_top, x1: x0,y1: y_bottom); |
|---|
| 3103 | } else { |
|---|
| 3104 | stbtt__handle_clipped_edge(scanline: scanline_fill-1,x: 0,e, x0,y0: y_top, x1: x0,y1: y_bottom); |
|---|
| 3105 | } |
|---|
| 3106 | } |
|---|
| 3107 | } else { |
|---|
| 3108 | float x0 = e->fx; |
|---|
| 3109 | float dx = e->fdx; |
|---|
| 3110 | float xb = x0 + dx; |
|---|
| 3111 | float x_top, x_bottom; |
|---|
| 3112 | float sy0,sy1; |
|---|
| 3113 | float dy = e->fdy; |
|---|
| 3114 | STBTT_assert(e->sy <= y_bottom && e->ey >= y_top); |
|---|
| 3115 | |
|---|
| 3116 | // compute endpoints of line segment clipped to this scanline (if the |
|---|
| 3117 | // line segment starts on this scanline. x0 is the intersection of the |
|---|
| 3118 | // line with y_top, but that may be off the line segment. |
|---|
| 3119 | if (e->sy > y_top) { |
|---|
| 3120 | x_top = x0 + dx * (e->sy - y_top); |
|---|
| 3121 | sy0 = e->sy; |
|---|
| 3122 | } else { |
|---|
| 3123 | x_top = x0; |
|---|
| 3124 | sy0 = y_top; |
|---|
| 3125 | } |
|---|
| 3126 | if (e->ey < y_bottom) { |
|---|
| 3127 | x_bottom = x0 + dx * (e->ey - y_top); |
|---|
| 3128 | sy1 = e->ey; |
|---|
| 3129 | } else { |
|---|
| 3130 | x_bottom = xb; |
|---|
| 3131 | sy1 = y_bottom; |
|---|
| 3132 | } |
|---|
| 3133 | |
|---|
| 3134 | if (x_top >= 0 && x_bottom >= 0 && x_top < len && x_bottom < len) { |
|---|
| 3135 | // from here on, we don't have to range check x values |
|---|
| 3136 | |
|---|
| 3137 | if ((int) x_top == (int) x_bottom) { |
|---|
| 3138 | float height; |
|---|
| 3139 | // simple case, only spans one pixel |
|---|
| 3140 | int x = (int) x_top; |
|---|
| 3141 | height = (sy1 - sy0) * e->direction; |
|---|
| 3142 | STBTT_assert(x >= 0 && x < len); |
|---|
| 3143 | scanline[x] += stbtt__position_trapezoid_area(height, tx0: x_top, tx1: x+1.0f, bx0: x_bottom, bx1: x+1.0f); |
|---|
| 3144 | scanline_fill[x] += height; // everything right of this pixel is filled |
|---|
| 3145 | } else { |
|---|
| 3146 | int x,x1,x2; |
|---|
| 3147 | float y_crossing, y_final, step, sign, area; |
|---|
| 3148 | // covers 2+ pixels |
|---|
| 3149 | if (x_top > x_bottom) { |
|---|
| 3150 | // flip scanline vertically; signed area is the same |
|---|
| 3151 | float t; |
|---|
| 3152 | sy0 = y_bottom - (sy0 - y_top); |
|---|
| 3153 | sy1 = y_bottom - (sy1 - y_top); |
|---|
| 3154 | t = sy0, sy0 = sy1, sy1 = t; |
|---|
| 3155 | t = x_bottom, x_bottom = x_top, x_top = t; |
|---|
| 3156 | dx = -dx; |
|---|
| 3157 | dy = -dy; |
|---|
| 3158 | t = x0, x0 = xb, xb = t; |
|---|
| 3159 | } |
|---|
| 3160 | STBTT_assert(dy >= 0); |
|---|
| 3161 | STBTT_assert(dx >= 0); |
|---|
| 3162 | |
|---|
| 3163 | x1 = (int) x_top; |
|---|
| 3164 | x2 = (int) x_bottom; |
|---|
| 3165 | // compute intersection with y axis at x1+1 |
|---|
| 3166 | y_crossing = y_top + dy * (x1+1 - x0); |
|---|
| 3167 | |
|---|
| 3168 | // compute intersection with y axis at x2 |
|---|
| 3169 | y_final = y_top + dy * (x2 - x0); |
|---|
| 3170 | |
|---|
| 3171 | // x1 x_top x2 x_bottom |
|---|
| 3172 | // y_top +------|-----+------------+------------+--------|---+------------+ |
|---|
| 3173 | // | | | | | | |
|---|
| 3174 | // | | | | | | |
|---|
| 3175 | // sy0 | Txxxxx|............|............|............|............| |
|---|
| 3176 | // y_crossing | *xxxxx.......|............|............|............| |
|---|
| 3177 | // | | xxxxx..|............|............|............| |
|---|
| 3178 | // | | /- xx*xxxx........|............|............| |
|---|
| 3179 | // | | dy < | xxxxxx..|............|............| |
|---|
| 3180 | // y_final | | \- | xx*xxx.........|............| |
|---|
| 3181 | // sy1 | | | | xxxxxB...|............| |
|---|
| 3182 | // | | | | | | |
|---|
| 3183 | // | | | | | | |
|---|
| 3184 | // y_bottom +------------+------------+------------+------------+------------+ |
|---|
| 3185 | // |
|---|
| 3186 | // goal is to measure the area covered by '.' in each pixel |
|---|
| 3187 | |
|---|
| 3188 | // if x2 is right at the right edge of x1, y_crossing can blow up, github #1057 |
|---|
| 3189 | // @TODO: maybe test against sy1 rather than y_bottom? |
|---|
| 3190 | if (y_crossing > y_bottom) |
|---|
| 3191 | y_crossing = y_bottom; |
|---|
| 3192 | |
|---|
| 3193 | sign = e->direction; |
|---|
| 3194 | |
|---|
| 3195 | // area of the rectangle covered from sy0..y_crossing |
|---|
| 3196 | area = sign * (y_crossing-sy0); |
|---|
| 3197 | |
|---|
| 3198 | // area of the triangle (x_top,sy0), (x1+1,sy0), (x1+1,y_crossing) |
|---|
| 3199 | scanline[x1] += stbtt__sized_triangle_area(height: area, width: x1+1 - x_top); |
|---|
| 3200 | |
|---|
| 3201 | // check if final y_crossing is blown up; no test case for this |
|---|
| 3202 | if (y_final > y_bottom) { |
|---|
| 3203 | int denom = (x2 - (x1+1)); |
|---|
| 3204 | y_final = y_bottom; |
|---|
| 3205 | if (denom != 0) { // [DEAR IMGUI] Avoid div by zero (https://github.com/nothings/stb/issues/1316) |
|---|
| 3206 | dy = (y_final - y_crossing ) / denom; // if denom=0, y_final = y_crossing, so y_final <= y_bottom |
|---|
| 3207 | } |
|---|
| 3208 | } |
|---|
| 3209 | |
|---|
| 3210 | // in second pixel, area covered by line segment found in first pixel |
|---|
| 3211 | // is always a rectangle 1 wide * the height of that line segment; this |
|---|
| 3212 | // is exactly what the variable 'area' stores. it also gets a contribution |
|---|
| 3213 | // from the line segment within it. the THIRD pixel will get the first |
|---|
| 3214 | // pixel's rectangle contribution, the second pixel's rectangle contribution, |
|---|
| 3215 | // and its own contribution. the 'own contribution' is the same in every pixel except |
|---|
| 3216 | // the leftmost and rightmost, a trapezoid that slides down in each pixel. |
|---|
| 3217 | // the second pixel's contribution to the third pixel will be the |
|---|
| 3218 | // rectangle 1 wide times the height change in the second pixel, which is dy. |
|---|
| 3219 | |
|---|
| 3220 | step = sign * dy * 1; // dy is dy/dx, change in y for every 1 change in x, |
|---|
| 3221 | // which multiplied by 1-pixel-width is how much pixel area changes for each step in x |
|---|
| 3222 | // so the area advances by 'step' every time |
|---|
| 3223 | |
|---|
| 3224 | for (x = x1+1; x < x2; ++x) { |
|---|
| 3225 | scanline[x] += area + step/2; // area of trapezoid is 1*step/2 |
|---|
| 3226 | area += step; |
|---|
| 3227 | } |
|---|
| 3228 | STBTT_assert(STBTT_fabs(area) <= 1.01f); // accumulated error from area += step unless we round step down |
|---|
| 3229 | STBTT_assert(sy1 > y_final-0.01f); |
|---|
| 3230 | |
|---|
| 3231 | // area covered in the last pixel is the rectangle from all the pixels to the left, |
|---|
| 3232 | // plus the trapezoid filled by the line segment in this pixel all the way to the right edge |
|---|
| 3233 | scanline[x2] += area + sign * stbtt__position_trapezoid_area(height: sy1-y_final, tx0: (float) x2, tx1: x2+1.0f, bx0: x_bottom, bx1: x2+1.0f); |
|---|
| 3234 | |
|---|
| 3235 | // the rest of the line is filled based on the total height of the line segment in this pixel |
|---|
| 3236 | scanline_fill[x2] += sign * (sy1-sy0); |
|---|
| 3237 | } |
|---|
| 3238 | } else { |
|---|
| 3239 | // if edge goes outside of box we're drawing, we require |
|---|
| 3240 | // clipping logic. since this does not match the intended use |
|---|
| 3241 | // of this library, we use a different, very slow brute |
|---|
| 3242 | // force implementation |
|---|
| 3243 | // note though that this does happen some of the time because |
|---|
| 3244 | // x_top and x_bottom can be extrapolated at the top & bottom of |
|---|
| 3245 | // the shape and actually lie outside the bounding box |
|---|
| 3246 | int x; |
|---|
| 3247 | for (x=0; x < len; ++x) { |
|---|
| 3248 | // cases: |
|---|
| 3249 | // |
|---|
| 3250 | // there can be up to two intersections with the pixel. any intersection |
|---|
| 3251 | // with left or right edges can be handled by splitting into two (or three) |
|---|
| 3252 | // regions. intersections with top & bottom do not necessitate case-wise logic. |
|---|
| 3253 | // |
|---|
| 3254 | // the old way of doing this found the intersections with the left & right edges, |
|---|
| 3255 | // then used some simple logic to produce up to three segments in sorted order |
|---|
| 3256 | // from top-to-bottom. however, this had a problem: if an x edge was epsilon |
|---|
| 3257 | // across the x border, then the corresponding y position might not be distinct |
|---|
| 3258 | // from the other y segment, and it might ignored as an empty segment. to avoid |
|---|
| 3259 | // that, we need to explicitly produce segments based on x positions. |
|---|
| 3260 | |
|---|
| 3261 | // rename variables to clearly-defined pairs |
|---|
| 3262 | float y0 = y_top; |
|---|
| 3263 | float x1 = (float) (x); |
|---|
| 3264 | float x2 = (float) (x+1); |
|---|
| 3265 | float x3 = xb; |
|---|
| 3266 | float y3 = y_bottom; |
|---|
| 3267 | |
|---|
| 3268 | // x = e->x + e->dx * (y-y_top) |
|---|
| 3269 | // (y-y_top) = (x - e->x) / e->dx |
|---|
| 3270 | // y = (x - e->x) / e->dx + y_top |
|---|
| 3271 | float y1 = (x - x0) / dx + y_top; |
|---|
| 3272 | float y2 = (x+1 - x0) / dx + y_top; |
|---|
| 3273 | |
|---|
| 3274 | if (x0 < x1 && x3 > x2) { // three segments descending down-right |
|---|
| 3275 | stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1); |
|---|
| 3276 | stbtt__handle_clipped_edge(scanline,x,e, x0: x1,y0: y1, x1: x2,y1: y2); |
|---|
| 3277 | stbtt__handle_clipped_edge(scanline,x,e, x0: x2,y0: y2, x1: x3,y1: y3); |
|---|
| 3278 | } else if (x3 < x1 && x0 > x2) { // three segments descending down-left |
|---|
| 3279 | stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1: x2,y1: y2); |
|---|
| 3280 | stbtt__handle_clipped_edge(scanline,x,e, x0: x2,y0: y2, x1,y1); |
|---|
| 3281 | stbtt__handle_clipped_edge(scanline,x,e, x0: x1,y0: y1, x1: x3,y1: y3); |
|---|
| 3282 | } else if (x0 < x1 && x3 > x1) { // two segments across x, down-right |
|---|
| 3283 | stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1); |
|---|
| 3284 | stbtt__handle_clipped_edge(scanline,x,e, x0: x1,y0: y1, x1: x3,y1: y3); |
|---|
| 3285 | } else if (x3 < x1 && x0 > x1) { // two segments across x, down-left |
|---|
| 3286 | stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1); |
|---|
| 3287 | stbtt__handle_clipped_edge(scanline,x,e, x0: x1,y0: y1, x1: x3,y1: y3); |
|---|
| 3288 | } else if (x0 < x2 && x3 > x2) { // two segments across x+1, down-right |
|---|
| 3289 | stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1: x2,y1: y2); |
|---|
| 3290 | stbtt__handle_clipped_edge(scanline,x,e, x0: x2,y0: y2, x1: x3,y1: y3); |
|---|
| 3291 | } else if (x3 < x2 && x0 > x2) { // two segments across x+1, down-left |
|---|
| 3292 | stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1: x2,y1: y2); |
|---|
| 3293 | stbtt__handle_clipped_edge(scanline,x,e, x0: x2,y0: y2, x1: x3,y1: y3); |
|---|
| 3294 | } else { // one segment |
|---|
| 3295 | stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1: x3,y1: y3); |
|---|
| 3296 | } |
|---|
| 3297 | } |
|---|
| 3298 | } |
|---|
| 3299 | } |
|---|
| 3300 | e = e->next; |
|---|
| 3301 | } |
|---|
| 3302 | } |
|---|
| 3303 | |
|---|
| 3304 | // directly AA rasterize edges w/o supersampling |
|---|
| 3305 | static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e, int n, int vsubsample, int off_x, int off_y, void *userdata) |
|---|
| 3306 | { |
|---|
| 3307 | stbtt__hheap hh = { .head: 0, .first_free: 0, .num_remaining_in_head_chunk: 0 }; |
|---|
| 3308 | stbtt__active_edge *active = NULL; |
|---|
| 3309 | int y,j=0, i; |
|---|
| 3310 | float scanline_data[129], *scanline, *scanline2; |
|---|
| 3311 | |
|---|
| 3312 | STBTT__NOTUSED(vsubsample); |
|---|
| 3313 | |
|---|
| 3314 | if (result->w > 64) |
|---|
| 3315 | scanline = (float *) STBTT_malloc((result->w*2+1) * sizeof(float), userdata); |
|---|
| 3316 | else |
|---|
| 3317 | scanline = scanline_data; |
|---|
| 3318 | |
|---|
| 3319 | scanline2 = scanline + result->w; |
|---|
| 3320 | |
|---|
| 3321 | y = off_y; |
|---|
| 3322 | e[n].y0 = (float) (off_y + result->h) + 1; |
|---|
| 3323 | |
|---|
| 3324 | while (j < result->h) { |
|---|
| 3325 | // find center of pixel for this scanline |
|---|
| 3326 | float scan_y_top = y + 0.0f; |
|---|
| 3327 | float scan_y_bottom = y + 1.0f; |
|---|
| 3328 | stbtt__active_edge **step = &active; |
|---|
| 3329 | |
|---|
| 3330 | STBTT_memset(s: scanline , c: 0, n: result->w*sizeof(scanline[0])); |
|---|
| 3331 | STBTT_memset(s: scanline2, c: 0, n: (result->w+1)*sizeof(scanline[0])); |
|---|
| 3332 | |
|---|
| 3333 | // update all active edges; |
|---|
| 3334 | // remove all active edges that terminate before the top of this scanline |
|---|
| 3335 | while (*step) { |
|---|
| 3336 | stbtt__active_edge * z = *step; |
|---|
| 3337 | if (z->ey <= scan_y_top) { |
|---|
| 3338 | *step = z->next; // delete from list |
|---|
| 3339 | STBTT_assert(z->direction); |
|---|
| 3340 | z->direction = 0; |
|---|
| 3341 | stbtt__hheap_free(hh: &hh, p: z); |
|---|
| 3342 | } else { |
|---|
| 3343 | step = &((*step)->next); // advance through list |
|---|
| 3344 | } |
|---|
| 3345 | } |
|---|
| 3346 | |
|---|
| 3347 | // insert all edges that start before the bottom of this scanline |
|---|
| 3348 | while (e->y0 <= scan_y_bottom) { |
|---|
| 3349 | if (e->y0 != e->y1) { |
|---|
| 3350 | stbtt__active_edge *z = stbtt__new_active(hh: &hh, e, off_x, start_point: scan_y_top, userdata); |
|---|
| 3351 | if (z != NULL) { |
|---|
| 3352 | if (j == 0 && off_y != 0) { |
|---|
| 3353 | if (z->ey < scan_y_top) { |
|---|
| 3354 | // this can happen due to subpixel positioning and some kind of fp rounding error i think |
|---|
| 3355 | z->ey = scan_y_top; |
|---|
| 3356 | } |
|---|
| 3357 | } |
|---|
| 3358 | STBTT_assert(z->ey >= scan_y_top); // if we get really unlucky a tiny bit of an edge can be out of bounds |
|---|
| 3359 | // insert at front |
|---|
| 3360 | z->next = active; |
|---|
| 3361 | active = z; |
|---|
| 3362 | } |
|---|
| 3363 | } |
|---|
| 3364 | ++e; |
|---|
| 3365 | } |
|---|
| 3366 | |
|---|
| 3367 | // now process all active edges |
|---|
| 3368 | if (active) |
|---|
| 3369 | stbtt__fill_active_edges_new(scanline, scanline_fill: scanline2+1, len: result->w, e: active, y_top: scan_y_top); |
|---|
| 3370 | |
|---|
| 3371 | { |
|---|
| 3372 | float sum = 0; |
|---|
| 3373 | for (i=0; i < result->w; ++i) { |
|---|
| 3374 | float k; |
|---|
| 3375 | int m; |
|---|
| 3376 | sum += scanline2[i]; |
|---|
| 3377 | k = scanline[i] + sum; |
|---|
| 3378 | k = (float) STBTT_fabs(k)*255 + 0.5f; |
|---|
| 3379 | m = (int) k; |
|---|
| 3380 | if (m > 255) m = 255; |
|---|
| 3381 | result->pixels[j*result->stride + i] = (unsigned char) m; |
|---|
| 3382 | } |
|---|
| 3383 | } |
|---|
| 3384 | // advance all the edges |
|---|
| 3385 | step = &active; |
|---|
| 3386 | while (*step) { |
|---|
| 3387 | stbtt__active_edge *z = *step; |
|---|
| 3388 | z->fx += z->fdx; // advance to position for current scanline |
|---|
| 3389 | step = &((*step)->next); // advance through list |
|---|
| 3390 | } |
|---|
| 3391 | |
|---|
| 3392 | ++y; |
|---|
| 3393 | ++j; |
|---|
| 3394 | } |
|---|
| 3395 | |
|---|
| 3396 | stbtt__hheap_cleanup(hh: &hh, userdata); |
|---|
| 3397 | |
|---|
| 3398 | if (scanline != scanline_data) |
|---|
| 3399 | STBTT_free(scanline, userdata); |
|---|
| 3400 | } |
|---|
| 3401 | #else |
|---|
| 3402 | #error "Unrecognized value of STBTT_RASTERIZER_VERSION" |
|---|
| 3403 | #endif |
|---|
| 3404 | |
|---|
| 3405 | #define STBTT__COMPARE(a,b) ((a)->y0 < (b)->y0) |
|---|
| 3406 | |
|---|
| 3407 | static void stbtt__sort_edges_ins_sort(stbtt__edge *p, int n) |
|---|
| 3408 | { |
|---|
| 3409 | int i,j; |
|---|
| 3410 | for (i=1; i < n; ++i) { |
|---|
| 3411 | stbtt__edge t = p[i], *a = &t; |
|---|
| 3412 | j = i; |
|---|
| 3413 | while (j > 0) { |
|---|
| 3414 | stbtt__edge *b = &p[j-1]; |
|---|
| 3415 | int c = STBTT__COMPARE(a,b); |
|---|
| 3416 | if (!c) break; |
|---|
| 3417 | p[j] = p[j-1]; |
|---|
| 3418 | --j; |
|---|
| 3419 | } |
|---|
| 3420 | if (i != j) |
|---|
| 3421 | p[j] = t; |
|---|
| 3422 | } |
|---|
| 3423 | } |
|---|
| 3424 | |
|---|
| 3425 | static void stbtt__sort_edges_quicksort(stbtt__edge *p, int n) |
|---|
| 3426 | { |
|---|
| 3427 | /* threshold for transitioning to insertion sort */ |
|---|
| 3428 | while (n > 12) { |
|---|
| 3429 | stbtt__edge t; |
|---|
| 3430 | int c01,c12,c,m,i,j; |
|---|
| 3431 | |
|---|
| 3432 | /* compute median of three */ |
|---|
| 3433 | m = n >> 1; |
|---|
| 3434 | c01 = STBTT__COMPARE(&p[0],&p[m]); |
|---|
| 3435 | c12 = STBTT__COMPARE(&p[m],&p[n-1]); |
|---|
| 3436 | /* if 0 >= mid >= end, or 0 < mid < end, then use mid */ |
|---|
| 3437 | if (c01 != c12) { |
|---|
| 3438 | /* otherwise, we'll need to swap something else to middle */ |
|---|
| 3439 | int z; |
|---|
| 3440 | c = STBTT__COMPARE(&p[0],&p[n-1]); |
|---|
| 3441 | /* 0>mid && mid<n: 0>n => n; 0<n => 0 */ |
|---|
| 3442 | /* 0<mid && mid>n: 0>n => 0; 0<n => n */ |
|---|
| 3443 | z = (c == c12) ? 0 : n-1; |
|---|
| 3444 | t = p[z]; |
|---|
| 3445 | p[z] = p[m]; |
|---|
| 3446 | p[m] = t; |
|---|
| 3447 | } |
|---|
| 3448 | /* now p[m] is the median-of-three */ |
|---|
| 3449 | /* swap it to the beginning so it won't move around */ |
|---|
| 3450 | t = p[0]; |
|---|
| 3451 | p[0] = p[m]; |
|---|
| 3452 | p[m] = t; |
|---|
| 3453 | |
|---|
| 3454 | /* partition loop */ |
|---|
| 3455 | i=1; |
|---|
| 3456 | j=n-1; |
|---|
| 3457 | for(;;) { |
|---|
| 3458 | /* handling of equality is crucial here */ |
|---|
| 3459 | /* for sentinels & efficiency with duplicates */ |
|---|
| 3460 | for (;;++i) { |
|---|
| 3461 | if (!STBTT__COMPARE(&p[i], &p[0])) break; |
|---|
| 3462 | } |
|---|
| 3463 | for (;;--j) { |
|---|
| 3464 | if (!STBTT__COMPARE(&p[0], &p[j])) break; |
|---|
| 3465 | } |
|---|
| 3466 | /* make sure we haven't crossed */ |
|---|
| 3467 | if (i >= j) break; |
|---|
| 3468 | t = p[i]; |
|---|
| 3469 | p[i] = p[j]; |
|---|
| 3470 | p[j] = t; |
|---|
| 3471 | |
|---|
| 3472 | ++i; |
|---|
| 3473 | --j; |
|---|
| 3474 | } |
|---|
| 3475 | /* recurse on smaller side, iterate on larger */ |
|---|
| 3476 | if (j < (n-i)) { |
|---|
| 3477 | stbtt__sort_edges_quicksort(p,n: j); |
|---|
| 3478 | p = p+i; |
|---|
| 3479 | n = n-i; |
|---|
| 3480 | } else { |
|---|
| 3481 | stbtt__sort_edges_quicksort(p: p+i, n: n-i); |
|---|
| 3482 | n = j; |
|---|
| 3483 | } |
|---|
| 3484 | } |
|---|
| 3485 | } |
|---|
| 3486 | |
|---|
| 3487 | static void stbtt__sort_edges(stbtt__edge *p, int n) |
|---|
| 3488 | { |
|---|
| 3489 | stbtt__sort_edges_quicksort(p, n); |
|---|
| 3490 | stbtt__sort_edges_ins_sort(p, n); |
|---|
| 3491 | } |
|---|
| 3492 | |
|---|
| 3493 | typedef struct |
|---|
| 3494 | { |
|---|
| 3495 | float x,y; |
|---|
| 3496 | } stbtt__point; |
|---|
| 3497 | |
|---|
| 3498 | static void stbtt__rasterize(stbtt__bitmap *result, stbtt__point *pts, int *wcount, int windings, float scale_x, float scale_y, float shift_x, float shift_y, int off_x, int off_y, int invert, void *userdata) |
|---|
| 3499 | { |
|---|
| 3500 | float y_scale_inv = invert ? -scale_y : scale_y; |
|---|
| 3501 | stbtt__edge *e; |
|---|
| 3502 | int n,i,j,k,m; |
|---|
| 3503 | #if STBTT_RASTERIZER_VERSION == 1 |
|---|
| 3504 | int vsubsample = result->h < 8 ? 15 : 5; |
|---|
| 3505 | #elif STBTT_RASTERIZER_VERSION == 2 |
|---|
| 3506 | int vsubsample = 1; |
|---|
| 3507 | #else |
|---|
| 3508 | #error "Unrecognized value of STBTT_RASTERIZER_VERSION" |
|---|
| 3509 | #endif |
|---|
| 3510 | // vsubsample should divide 255 evenly; otherwise we won't reach full opacity |
|---|
| 3511 | |
|---|
| 3512 | // now we have to blow out the windings into explicit edge lists |
|---|
| 3513 | n = 0; |
|---|
| 3514 | for (i=0; i < windings; ++i) |
|---|
| 3515 | n += wcount[i]; |
|---|
| 3516 | |
|---|
| 3517 | e = (stbtt__edge *) STBTT_malloc(sizeof(*e) * (n+1), userdata); // add an extra one as a sentinel |
|---|
| 3518 | if (e == 0) return; |
|---|
| 3519 | n = 0; |
|---|
| 3520 | |
|---|
| 3521 | m=0; |
|---|
| 3522 | for (i=0; i < windings; ++i) { |
|---|
| 3523 | stbtt__point *p = pts + m; |
|---|
| 3524 | m += wcount[i]; |
|---|
| 3525 | j = wcount[i]-1; |
|---|
| 3526 | for (k=0; k < wcount[i]; j=k++) { |
|---|
| 3527 | int a=k,b=j; |
|---|
| 3528 | // skip the edge if horizontal |
|---|
| 3529 | if (p[j].y == p[k].y) |
|---|
| 3530 | continue; |
|---|
| 3531 | // add edge from j to k to the list |
|---|
| 3532 | e[n].invert = 0; |
|---|
| 3533 | if (invert ? p[j].y > p[k].y : p[j].y < p[k].y) { |
|---|
| 3534 | e[n].invert = 1; |
|---|
| 3535 | a=j,b=k; |
|---|
| 3536 | } |
|---|
| 3537 | e[n].x0 = p[a].x * scale_x + shift_x; |
|---|
| 3538 | e[n].y0 = (p[a].y * y_scale_inv + shift_y) * vsubsample; |
|---|
| 3539 | e[n].x1 = p[b].x * scale_x + shift_x; |
|---|
| 3540 | e[n].y1 = (p[b].y * y_scale_inv + shift_y) * vsubsample; |
|---|
| 3541 | ++n; |
|---|
| 3542 | } |
|---|
| 3543 | } |
|---|
| 3544 | |
|---|
| 3545 | // now sort the edges by their highest point (should snap to integer, and then by x) |
|---|
| 3546 | //STBTT_sort(e, n, sizeof(e[0]), stbtt__edge_compare); |
|---|
| 3547 | stbtt__sort_edges(p: e, n); |
|---|
| 3548 | |
|---|
| 3549 | // now, traverse the scanlines and find the intersections on each scanline, use xor winding rule |
|---|
| 3550 | stbtt__rasterize_sorted_edges(result, e, n, vsubsample, off_x, off_y, userdata); |
|---|
| 3551 | |
|---|
| 3552 | STBTT_free(e, userdata); |
|---|
| 3553 | } |
|---|
| 3554 | |
|---|
| 3555 | static void stbtt__add_point(stbtt__point *points, int n, float x, float y) |
|---|
| 3556 | { |
|---|
| 3557 | if (!points) return; // during first pass, it's unallocated |
|---|
| 3558 | points[n].x = x; |
|---|
| 3559 | points[n].y = y; |
|---|
| 3560 | } |
|---|
| 3561 | |
|---|
| 3562 | // tessellate until threshold p is happy... @TODO warped to compensate for non-linear stretching |
|---|
| 3563 | static int stbtt__tesselate_curve(stbtt__point *points, int *num_points, float x0, float y0, float x1, float y1, float x2, float y2, float objspace_flatness_squared, int n) |
|---|
| 3564 | { |
|---|
| 3565 | // midpoint |
|---|
| 3566 | float mx = (x0 + 2*x1 + x2)/4; |
|---|
| 3567 | float my = (y0 + 2*y1 + y2)/4; |
|---|
| 3568 | // versus directly drawn line |
|---|
| 3569 | float dx = (x0+x2)/2 - mx; |
|---|
| 3570 | float dy = (y0+y2)/2 - my; |
|---|
| 3571 | if (n > 16) // 65536 segments on one curve better be enough! |
|---|
| 3572 | return 1; |
|---|
| 3573 | if (dx*dx+dy*dy > objspace_flatness_squared) { // half-pixel error allowed... need to be smaller if AA |
|---|
| 3574 | stbtt__tesselate_curve(points, num_points, x0,y0, x1: (x0+x1)/2.0f,y1: (y0+y1)/2.0f, x2: mx,y2: my, objspace_flatness_squared,n: n+1); |
|---|
| 3575 | stbtt__tesselate_curve(points, num_points, x0: mx,y0: my, x1: (x1+x2)/2.0f,y1: (y1+y2)/2.0f, x2,y2, objspace_flatness_squared,n: n+1); |
|---|
| 3576 | } else { |
|---|
| 3577 | stbtt__add_point(points, n: *num_points,x: x2,y: y2); |
|---|
| 3578 | *num_points = *num_points+1; |
|---|
| 3579 | } |
|---|
| 3580 | return 1; |
|---|
| 3581 | } |
|---|
| 3582 | |
|---|
| 3583 | static void stbtt__tesselate_cubic(stbtt__point *points, int *num_points, float x0, float y0, float x1, float y1, float x2, float y2, float x3, float y3, float objspace_flatness_squared, int n) |
|---|
| 3584 | { |
|---|
| 3585 | // @TODO this "flatness" calculation is just made-up nonsense that seems to work well enough |
|---|
| 3586 | float dx0 = x1-x0; |
|---|
| 3587 | float dy0 = y1-y0; |
|---|
| 3588 | float dx1 = x2-x1; |
|---|
| 3589 | float dy1 = y2-y1; |
|---|
| 3590 | float dx2 = x3-x2; |
|---|
| 3591 | float dy2 = y3-y2; |
|---|
| 3592 | float dx = x3-x0; |
|---|
| 3593 | float dy = y3-y0; |
|---|
| 3594 | float longlen = (float) (STBTT_sqrt(dx0*dx0+dy0*dy0)+STBTT_sqrt(dx1*dx1+dy1*dy1)+STBTT_sqrt(dx2*dx2+dy2*dy2)); |
|---|
| 3595 | float shortlen = (float) STBTT_sqrt(dx*dx+dy*dy); |
|---|
| 3596 | float flatness_squared = longlen*longlen-shortlen*shortlen; |
|---|
| 3597 | |
|---|
| 3598 | if (n > 16) // 65536 segments on one curve better be enough! |
|---|
| 3599 | return; |
|---|
| 3600 | |
|---|
| 3601 | if (flatness_squared > objspace_flatness_squared) { |
|---|
| 3602 | float x01 = (x0+x1)/2; |
|---|
| 3603 | float y01 = (y0+y1)/2; |
|---|
| 3604 | float x12 = (x1+x2)/2; |
|---|
| 3605 | float y12 = (y1+y2)/2; |
|---|
| 3606 | float x23 = (x2+x3)/2; |
|---|
| 3607 | float y23 = (y2+y3)/2; |
|---|
| 3608 | |
|---|
| 3609 | float xa = (x01+x12)/2; |
|---|
| 3610 | float ya = (y01+y12)/2; |
|---|
| 3611 | float xb = (x12+x23)/2; |
|---|
| 3612 | float yb = (y12+y23)/2; |
|---|
| 3613 | |
|---|
| 3614 | float mx = (xa+xb)/2; |
|---|
| 3615 | float my = (ya+yb)/2; |
|---|
| 3616 | |
|---|
| 3617 | stbtt__tesselate_cubic(points, num_points, x0,y0, x1: x01,y1: y01, x2: xa,y2: ya, x3: mx,y3: my, objspace_flatness_squared,n: n+1); |
|---|
| 3618 | stbtt__tesselate_cubic(points, num_points, x0: mx,y0: my, x1: xb,y1: yb, x2: x23,y2: y23, x3,y3, objspace_flatness_squared,n: n+1); |
|---|
| 3619 | } else { |
|---|
| 3620 | stbtt__add_point(points, n: *num_points,x: x3,y: y3); |
|---|
| 3621 | *num_points = *num_points+1; |
|---|
| 3622 | } |
|---|
| 3623 | } |
|---|
| 3624 | |
|---|
| 3625 | // returns number of contours |
|---|
| 3626 | static stbtt__point *stbtt_FlattenCurves(stbtt_vertex *vertices, int num_verts, float objspace_flatness, int **contour_lengths, int *num_contours, void *userdata) |
|---|
| 3627 | { |
|---|
| 3628 | stbtt__point *points=0; |
|---|
| 3629 | int num_points=0; |
|---|
| 3630 | |
|---|
| 3631 | float objspace_flatness_squared = objspace_flatness * objspace_flatness; |
|---|
| 3632 | int i,n=0,start=0, pass; |
|---|
| 3633 | |
|---|
| 3634 | // count how many "moves" there are to get the contour count |
|---|
| 3635 | for (i=0; i < num_verts; ++i) |
|---|
| 3636 | if (vertices[i].type == STBTT_vmove) |
|---|
| 3637 | ++n; |
|---|
| 3638 | |
|---|
| 3639 | *num_contours = n; |
|---|
| 3640 | if (n == 0) return 0; |
|---|
| 3641 | |
|---|
| 3642 | *contour_lengths = (int *) STBTT_malloc(sizeof(**contour_lengths) * n, userdata); |
|---|
| 3643 | |
|---|
| 3644 | if (*contour_lengths == 0) { |
|---|
| 3645 | *num_contours = 0; |
|---|
| 3646 | return 0; |
|---|
| 3647 | } |
|---|
| 3648 | |
|---|
| 3649 | // make two passes through the points so we don't need to realloc |
|---|
| 3650 | for (pass=0; pass < 2; ++pass) { |
|---|
| 3651 | float x=0,y=0; |
|---|
| 3652 | if (pass == 1) { |
|---|
| 3653 | points = (stbtt__point *) STBTT_malloc(num_points * sizeof(points[0]), userdata); |
|---|
| 3654 | if (points == NULL) goto error; |
|---|
| 3655 | } |
|---|
| 3656 | num_points = 0; |
|---|
| 3657 | n= -1; |
|---|
| 3658 | for (i=0; i < num_verts; ++i) { |
|---|
| 3659 | switch (vertices[i].type) { |
|---|
| 3660 | case STBTT_vmove: |
|---|
| 3661 | // start the next contour |
|---|
| 3662 | if (n >= 0) |
|---|
| 3663 | (*contour_lengths)[n] = num_points - start; |
|---|
| 3664 | ++n; |
|---|
| 3665 | start = num_points; |
|---|
| 3666 | |
|---|
| 3667 | x = vertices[i].x, y = vertices[i].y; |
|---|
| 3668 | stbtt__add_point(points, n: num_points++, x,y); |
|---|
| 3669 | break; |
|---|
| 3670 | case STBTT_vline: |
|---|
| 3671 | x = vertices[i].x, y = vertices[i].y; |
|---|
| 3672 | stbtt__add_point(points, n: num_points++, x, y); |
|---|
| 3673 | break; |
|---|
| 3674 | case STBTT_vcurve: |
|---|
| 3675 | stbtt__tesselate_curve(points, num_points: &num_points, x0: x,y0: y, |
|---|
| 3676 | x1: vertices[i].cx, y1: vertices[i].cy, |
|---|
| 3677 | x2: vertices[i].x, y2: vertices[i].y, |
|---|
| 3678 | objspace_flatness_squared, n: 0); |
|---|
| 3679 | x = vertices[i].x, y = vertices[i].y; |
|---|
| 3680 | break; |
|---|
| 3681 | case STBTT_vcubic: |
|---|
| 3682 | stbtt__tesselate_cubic(points, num_points: &num_points, x0: x,y0: y, |
|---|
| 3683 | x1: vertices[i].cx, y1: vertices[i].cy, |
|---|
| 3684 | x2: vertices[i].cx1, y2: vertices[i].cy1, |
|---|
| 3685 | x3: vertices[i].x, y3: vertices[i].y, |
|---|
| 3686 | objspace_flatness_squared, n: 0); |
|---|
| 3687 | x = vertices[i].x, y = vertices[i].y; |
|---|
| 3688 | break; |
|---|
| 3689 | } |
|---|
| 3690 | } |
|---|
| 3691 | (*contour_lengths)[n] = num_points - start; |
|---|
| 3692 | } |
|---|
| 3693 | |
|---|
| 3694 | return points; |
|---|
| 3695 | error: |
|---|
| 3696 | STBTT_free(points, userdata); |
|---|
| 3697 | STBTT_free(*contour_lengths, userdata); |
|---|
| 3698 | *contour_lengths = 0; |
|---|
| 3699 | *num_contours = 0; |
|---|
| 3700 | return NULL; |
|---|
| 3701 | } |
|---|
| 3702 | |
|---|
| 3703 | STBTT_DEF void stbtt_Rasterize(stbtt__bitmap *result, float flatness_in_pixels, stbtt_vertex *vertices, int num_verts, float scale_x, float scale_y, float shift_x, float shift_y, int x_off, int y_off, int invert, void *userdata) |
|---|
| 3704 | { |
|---|
| 3705 | float scale = scale_x > scale_y ? scale_y : scale_x; |
|---|
| 3706 | int winding_count = 0; |
|---|
| 3707 | int *winding_lengths = NULL; |
|---|
| 3708 | stbtt__point *windings = stbtt_FlattenCurves(vertices, num_verts, objspace_flatness: flatness_in_pixels / scale, contour_lengths: &winding_lengths, num_contours: &winding_count, userdata); |
|---|
| 3709 | if (windings) { |
|---|
| 3710 | stbtt__rasterize(result, pts: windings, wcount: winding_lengths, windings: winding_count, scale_x, scale_y, shift_x, shift_y, off_x: x_off, off_y: y_off, invert, userdata); |
|---|
| 3711 | STBTT_free(winding_lengths, userdata); |
|---|
| 3712 | STBTT_free(windings, userdata); |
|---|
| 3713 | } |
|---|
| 3714 | } |
|---|
| 3715 | |
|---|
| 3716 | STBTT_DEF void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata) |
|---|
| 3717 | { |
|---|
| 3718 | STBTT_free(bitmap, userdata); |
|---|
| 3719 | } |
|---|
| 3720 | |
|---|
| 3721 | STBTT_DEF unsigned char *stbtt_GetGlyphBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int glyph, int *width, int *height, int *xoff, int *yoff) |
|---|
| 3722 | { |
|---|
| 3723 | int ix0,iy0,ix1,iy1; |
|---|
| 3724 | stbtt__bitmap gbm; |
|---|
| 3725 | stbtt_vertex *vertices; |
|---|
| 3726 | int num_verts = stbtt_GetGlyphShape(info, glyph_index: glyph, pvertices: &vertices); |
|---|
| 3727 | |
|---|
| 3728 | if (scale_x == 0) scale_x = scale_y; |
|---|
| 3729 | if (scale_y == 0) { |
|---|
| 3730 | if (scale_x == 0) { |
|---|
| 3731 | STBTT_free(vertices, info->userdata); |
|---|
| 3732 | return NULL; |
|---|
| 3733 | } |
|---|
| 3734 | scale_y = scale_x; |
|---|
| 3735 | } |
|---|
| 3736 | |
|---|
| 3737 | stbtt_GetGlyphBitmapBoxSubpixel(font: info, glyph, scale_x, scale_y, shift_x, shift_y, ix0: &ix0,iy0: &iy0,ix1: &ix1,iy1: &iy1); |
|---|
| 3738 | |
|---|
| 3739 | // now we get the size |
|---|
| 3740 | gbm.w = (ix1 - ix0); |
|---|
| 3741 | gbm.h = (iy1 - iy0); |
|---|
| 3742 | gbm.pixels = NULL; // in case we error |
|---|
| 3743 | |
|---|
| 3744 | if (width ) *width = gbm.w; |
|---|
| 3745 | if (height) *height = gbm.h; |
|---|
| 3746 | if (xoff ) *xoff = ix0; |
|---|
| 3747 | if (yoff ) *yoff = iy0; |
|---|
| 3748 | |
|---|
| 3749 | if (gbm.w && gbm.h) { |
|---|
| 3750 | gbm.pixels = (unsigned char *) STBTT_malloc(gbm.w * gbm.h, info->userdata); |
|---|
| 3751 | if (gbm.pixels) { |
|---|
| 3752 | gbm.stride = gbm.w; |
|---|
| 3753 | |
|---|
| 3754 | stbtt_Rasterize(result: &gbm, flatness_in_pixels: 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, x_off: ix0, y_off: iy0, invert: 1, userdata: info->userdata); |
|---|
| 3755 | } |
|---|
| 3756 | } |
|---|
| 3757 | STBTT_free(vertices, info->userdata); |
|---|
| 3758 | return gbm.pixels; |
|---|
| 3759 | } |
|---|
| 3760 | |
|---|
| 3761 | STBTT_DEF unsigned char *stbtt_GetGlyphBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int glyph, int *width, int *height, int *xoff, int *yoff) |
|---|
| 3762 | { |
|---|
| 3763 | return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y, shift_x: 0.0f, shift_y: 0.0f, glyph, width, height, xoff, yoff); |
|---|
| 3764 | } |
|---|
| 3765 | |
|---|
| 3766 | STBTT_DEF void stbtt_MakeGlyphBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int glyph) |
|---|
| 3767 | { |
|---|
| 3768 | int ix0,iy0; |
|---|
| 3769 | stbtt_vertex *vertices; |
|---|
| 3770 | int num_verts = stbtt_GetGlyphShape(info, glyph_index: glyph, pvertices: &vertices); |
|---|
| 3771 | stbtt__bitmap gbm; |
|---|
| 3772 | |
|---|
| 3773 | stbtt_GetGlyphBitmapBoxSubpixel(font: info, glyph, scale_x, scale_y, shift_x, shift_y, ix0: &ix0,iy0: &iy0,ix1: 0,iy1: 0); |
|---|
| 3774 | gbm.pixels = output; |
|---|
| 3775 | gbm.w = out_w; |
|---|
| 3776 | gbm.h = out_h; |
|---|
| 3777 | gbm.stride = out_stride; |
|---|
| 3778 | |
|---|
| 3779 | if (gbm.w && gbm.h) |
|---|
| 3780 | stbtt_Rasterize(result: &gbm, flatness_in_pixels: 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, x_off: ix0,y_off: iy0, invert: 1, userdata: info->userdata); |
|---|
| 3781 | |
|---|
| 3782 | STBTT_free(vertices, info->userdata); |
|---|
| 3783 | } |
|---|
| 3784 | |
|---|
| 3785 | STBTT_DEF void stbtt_MakeGlyphBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int glyph) |
|---|
| 3786 | { |
|---|
| 3787 | stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, shift_x: 0.0f,shift_y: 0.0f, glyph); |
|---|
| 3788 | } |
|---|
| 3789 | |
|---|
| 3790 | STBTT_DEF unsigned char *stbtt_GetCodepointBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint, int *width, int *height, int *xoff, int *yoff) |
|---|
| 3791 | { |
|---|
| 3792 | return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y,shift_x,shift_y, glyph: stbtt_FindGlyphIndex(info,unicode_codepoint: codepoint), width,height,xoff,yoff); |
|---|
| 3793 | } |
|---|
| 3794 | |
|---|
| 3795 | STBTT_DEF void stbtt_MakeCodepointBitmapSubpixelPrefilter(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int oversample_x, int oversample_y, float *sub_x, float *sub_y, int codepoint) |
|---|
| 3796 | { |
|---|
| 3797 | stbtt_MakeGlyphBitmapSubpixelPrefilter(info, output, out_w, out_h, out_stride, scale_x, scale_y, shift_x, shift_y, oversample_x, oversample_y, sub_x, sub_y, glyph: stbtt_FindGlyphIndex(info,unicode_codepoint: codepoint)); |
|---|
| 3798 | } |
|---|
| 3799 | |
|---|
| 3800 | STBTT_DEF void stbtt_MakeCodepointBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint) |
|---|
| 3801 | { |
|---|
| 3802 | stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, shift_x, shift_y, glyph: stbtt_FindGlyphIndex(info,unicode_codepoint: codepoint)); |
|---|
| 3803 | } |
|---|
| 3804 | |
|---|
| 3805 | STBTT_DEF unsigned char *stbtt_GetCodepointBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int codepoint, int *width, int *height, int *xoff, int *yoff) |
|---|
| 3806 | { |
|---|
| 3807 | return stbtt_GetCodepointBitmapSubpixel(info, scale_x, scale_y, shift_x: 0.0f,shift_y: 0.0f, codepoint, width,height,xoff,yoff); |
|---|
| 3808 | } |
|---|
| 3809 | |
|---|
| 3810 | STBTT_DEF void stbtt_MakeCodepointBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int codepoint) |
|---|
| 3811 | { |
|---|
| 3812 | stbtt_MakeCodepointBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, shift_x: 0.0f,shift_y: 0.0f, codepoint); |
|---|
| 3813 | } |
|---|
| 3814 | |
|---|
| 3815 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 3816 | // |
|---|
| 3817 | // bitmap baking |
|---|
| 3818 | // |
|---|
| 3819 | // This is SUPER-CRAPPY packing to keep source code small |
|---|
| 3820 | |
|---|
| 3821 | static int stbtt_BakeFontBitmap_internal(unsigned char *data, int offset, // font location (use offset=0 for plain .ttf) |
|---|
| 3822 | float pixel_height, // height of font in pixels |
|---|
| 3823 | unsigned char *pixels, int pw, int ph, // bitmap to be filled in |
|---|
| 3824 | int first_char, int num_chars, // characters to bake |
|---|
| 3825 | stbtt_bakedchar *chardata) |
|---|
| 3826 | { |
|---|
| 3827 | float scale; |
|---|
| 3828 | int x,y,bottom_y, i; |
|---|
| 3829 | stbtt_fontinfo f; |
|---|
| 3830 | f.userdata = NULL; |
|---|
| 3831 | if (!stbtt_InitFont(info: &f, data, offset)) |
|---|
| 3832 | return -1; |
|---|
| 3833 | STBTT_memset(s: pixels, c: 0, n: pw*ph); // background of 0 around pixels |
|---|
| 3834 | x=y=1; |
|---|
| 3835 | bottom_y = 1; |
|---|
| 3836 | |
|---|
| 3837 | scale = stbtt_ScaleForPixelHeight(info: &f, height: pixel_height); |
|---|
| 3838 | |
|---|
| 3839 | for (i=0; i < num_chars; ++i) { |
|---|
| 3840 | int advance, lsb, x0,y0,x1,y1,gw,gh; |
|---|
| 3841 | int g = stbtt_FindGlyphIndex(info: &f, unicode_codepoint: first_char + i); |
|---|
| 3842 | stbtt_GetGlyphHMetrics(info: &f, glyph_index: g, advanceWidth: &advance, leftSideBearing: &lsb); |
|---|
| 3843 | stbtt_GetGlyphBitmapBox(font: &f, glyph: g, scale_x: scale,scale_y: scale, ix0: &x0,iy0: &y0,ix1: &x1,iy1: &y1); |
|---|
| 3844 | gw = x1-x0; |
|---|
| 3845 | gh = y1-y0; |
|---|
| 3846 | if (x + gw + 1 >= pw) |
|---|
| 3847 | y = bottom_y, x = 1; // advance to next row |
|---|
| 3848 | if (y + gh + 1 >= ph) // check if it fits vertically AFTER potentially moving to next row |
|---|
| 3849 | return -i; |
|---|
| 3850 | STBTT_assert(x+gw < pw); |
|---|
| 3851 | STBTT_assert(y+gh < ph); |
|---|
| 3852 | stbtt_MakeGlyphBitmap(info: &f, output: pixels+x+y*pw, out_w: gw,out_h: gh,out_stride: pw, scale_x: scale,scale_y: scale, glyph: g); |
|---|
| 3853 | chardata[i].x0 = (stbtt_int16) x; |
|---|
| 3854 | chardata[i].y0 = (stbtt_int16) y; |
|---|
| 3855 | chardata[i].x1 = (stbtt_int16) (x + gw); |
|---|
| 3856 | chardata[i].y1 = (stbtt_int16) (y + gh); |
|---|
| 3857 | chardata[i].xadvance = scale * advance; |
|---|
| 3858 | chardata[i].xoff = (float) x0; |
|---|
| 3859 | chardata[i].yoff = (float) y0; |
|---|
| 3860 | x = x + gw + 1; |
|---|
| 3861 | if (y+gh+1 > bottom_y) |
|---|
| 3862 | bottom_y = y+gh+1; |
|---|
| 3863 | } |
|---|
| 3864 | return bottom_y; |
|---|
| 3865 | } |
|---|
| 3866 | |
|---|
| 3867 | STBTT_DEF void stbtt_GetBakedQuad(const stbtt_bakedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int opengl_fillrule) |
|---|
| 3868 | { |
|---|
| 3869 | float d3d_bias = opengl_fillrule ? 0 : -0.5f; |
|---|
| 3870 | float ipw = 1.0f / pw, iph = 1.0f / ph; |
|---|
| 3871 | const stbtt_bakedchar *b = chardata + char_index; |
|---|
| 3872 | int round_x = STBTT_ifloor((*xpos + b->xoff) + 0.5f); |
|---|
| 3873 | int round_y = STBTT_ifloor((*ypos + b->yoff) + 0.5f); |
|---|
| 3874 | |
|---|
| 3875 | q->x0 = round_x + d3d_bias; |
|---|
| 3876 | q->y0 = round_y + d3d_bias; |
|---|
| 3877 | q->x1 = round_x + b->x1 - b->x0 + d3d_bias; |
|---|
| 3878 | q->y1 = round_y + b->y1 - b->y0 + d3d_bias; |
|---|
| 3879 | |
|---|
| 3880 | q->s0 = b->x0 * ipw; |
|---|
| 3881 | q->t0 = b->y0 * iph; |
|---|
| 3882 | q->s1 = b->x1 * ipw; |
|---|
| 3883 | q->t1 = b->y1 * iph; |
|---|
| 3884 | |
|---|
| 3885 | *xpos += b->xadvance; |
|---|
| 3886 | } |
|---|
| 3887 | |
|---|
| 3888 | ////////////////////////////////////////////////////////////////////////////// |
|---|
| 3889 | // |
|---|
| 3890 | // rectangle packing replacement routines if you don't have stb_rect_pack.h |
|---|
| 3891 | // |
|---|
| 3892 | |
|---|
| 3893 | #ifndef STB_RECT_PACK_VERSION |
|---|
| 3894 | |
|---|
| 3895 | typedef int stbrp_coord; |
|---|
| 3896 | |
|---|
| 3897 | //////////////////////////////////////////////////////////////////////////////////// |
|---|
| 3898 | // // |
|---|
| 3899 | // // |
|---|
| 3900 | // COMPILER WARNING ?!?!? // |
|---|
| 3901 | // // |
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| 3902 | // // |
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| 3903 | // if you get a compile warning due to these symbols being defined more than // |
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| 3904 | // once, move #include "stb_rect_pack.h" before #include "stb_truetype.h" // |
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| 3905 | // // |
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| 3906 | //////////////////////////////////////////////////////////////////////////////////// |
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| 3907 | |
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| 3908 | typedef struct |
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| 3909 | { |
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| 3910 | int width,height; |
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| 3911 | int x,y,bottom_y; |
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| 3912 | } stbrp_context; |
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| 3913 | |
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| 3914 | typedef struct |
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| 3915 | { |
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| 3916 | unsigned char x; |
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| 3917 | } stbrp_node; |
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| 3918 | |
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| 3919 | struct stbrp_rect |
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| 3920 | { |
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| 3921 | stbrp_coord x,y; |
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| 3922 | int id,w,h,was_packed; |
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| 3923 | }; |
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| 3924 | |
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| 3925 | static void stbrp_init_target(stbrp_context *con, int pw, int ph, stbrp_node *nodes, int num_nodes) |
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| 3926 | { |
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| 3927 | con->width = pw; |
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| 3928 | con->height = ph; |
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| 3929 | con->x = 0; |
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| 3930 | con->y = 0; |
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| 3931 | con->bottom_y = 0; |
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| 3932 | STBTT__NOTUSED(nodes); |
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| 3933 | STBTT__NOTUSED(num_nodes); |
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| 3934 | } |
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| 3935 | |
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| 3936 | static void stbrp_pack_rects(stbrp_context *con, stbrp_rect *rects, int num_rects) |
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| 3937 | { |
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| 3938 | int i; |
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| 3939 | for (i=0; i < num_rects; ++i) { |
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| 3940 | if (con->x + rects[i].w > con->width) { |
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| 3941 | con->x = 0; |
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| 3942 | con->y = con->bottom_y; |
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| 3943 | } |
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| 3944 | if (con->y + rects[i].h > con->height) |
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| 3945 | break; |
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| 3946 | rects[i].x = con->x; |
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| 3947 | rects[i].y = con->y; |
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| 3948 | rects[i].was_packed = 1; |
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| 3949 | con->x += rects[i].w; |
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| 3950 | if (con->y + rects[i].h > con->bottom_y) |
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| 3951 | con->bottom_y = con->y + rects[i].h; |
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| 3952 | } |
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| 3953 | for ( ; i < num_rects; ++i) |
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| 3954 | rects[i].was_packed = 0; |
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| 3955 | } |
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| 3956 | #endif |
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| 3957 | |
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| 3958 | ////////////////////////////////////////////////////////////////////////////// |
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| 3959 | // |
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| 3960 | // bitmap baking |
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| 3961 | // |
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| 3962 | // This is SUPER-AWESOME (tm Ryan Gordon) packing using stb_rect_pack.h. If |
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| 3963 | // stb_rect_pack.h isn't available, it uses the BakeFontBitmap strategy. |
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| 3964 | |
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| 3965 | STBTT_DEF int stbtt_PackBegin(stbtt_pack_context *spc, unsigned char *pixels, int pw, int ph, int stride_in_bytes, int padding, void *alloc_context) |
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| 3966 | { |
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| 3967 | stbrp_context *context = (stbrp_context *) STBTT_malloc(sizeof(*context) ,alloc_context); |
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| 3968 | int num_nodes = pw - padding; |
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| 3969 | stbrp_node *nodes = (stbrp_node *) STBTT_malloc(sizeof(*nodes ) * num_nodes,alloc_context); |
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| 3970 | |
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| 3971 | if (context == NULL || nodes == NULL) { |
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| 3972 | if (context != NULL) STBTT_free(context, alloc_context); |
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| 3973 | if (nodes != NULL) STBTT_free(nodes , alloc_context); |
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| 3974 | return 0; |
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| 3975 | } |
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| 3976 | |
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| 3977 | spc->user_allocator_context = alloc_context; |
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| 3978 | spc->width = pw; |
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| 3979 | spc->height = ph; |
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| 3980 | spc->pixels = pixels; |
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| 3981 | spc->pack_info = context; |
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| 3982 | spc->nodes = nodes; |
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| 3983 | spc->padding = padding; |
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| 3984 | spc->stride_in_bytes = stride_in_bytes != 0 ? stride_in_bytes : pw; |
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| 3985 | spc->h_oversample = 1; |
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| 3986 | spc->v_oversample = 1; |
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| 3987 | spc->skip_missing = 0; |
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| 3988 | |
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| 3989 | stbrp_init_target(context, width: pw-padding, height: ph-padding, nodes, num_nodes); |
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| 3990 | |
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| 3991 | if (pixels) |
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| 3992 | STBTT_memset(s: pixels, c: 0, n: pw*ph); // background of 0 around pixels |
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| 3993 | |
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| 3994 | return 1; |
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| 3995 | } |
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| 3996 | |
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| 3997 | STBTT_DEF void stbtt_PackEnd (stbtt_pack_context *spc) |
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| 3998 | { |
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| 3999 | STBTT_free(spc->nodes , spc->user_allocator_context); |
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| 4000 | STBTT_free(spc->pack_info, spc->user_allocator_context); |
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| 4001 | } |
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| 4002 | |
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| 4003 | STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h_oversample, unsigned int v_oversample) |
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| 4004 | { |
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| 4005 | STBTT_assert( |
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