1/*
2 * Copyright (C) 2015 The Qt Company Ltd
3 *
4 * This is part of HarfBuzz, an OpenType Layout engine library.
5 *
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
11 *
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
16 * DAMAGE.
17 *
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
23 */
24
25#ifndef HARFBUZZ_SHAPER_H
26#define HARFBUZZ_SHAPER_H
27
28#include "harfbuzz-global.h"
29#include "harfbuzz-gdef.h"
30#include "harfbuzz-gpos.h"
31#include "harfbuzz-gsub.h"
32#include "harfbuzz-external.h"
33#include "harfbuzz-stream-private.h"
34
35HB_BEGIN_HEADER
36
37/*
38 using anything else than signed or unsigned for bitfields in C is non standard,
39 but accepted by almost all compilers. And it gives a significant reduction in
40 memory consumption as HB_CharAttributes and HB_GlyphAttributes will not have
41 a 4 byte alignment
42*/
43#ifdef __xlC__
44typedef unsigned hb_bitfield;
45#else
46typedef hb_uint8 hb_bitfield;
47#endif
48
49typedef enum {
50 HB_Script_Common,
51 HB_Script_Greek,
52 HB_Script_Cyrillic,
53 HB_Script_Armenian,
54 HB_Script_Hebrew,
55 HB_Script_Arabic,
56 HB_Script_Syriac,
57 HB_Script_Thaana,
58 HB_Script_Devanagari,
59 HB_Script_Bengali,
60 HB_Script_Gurmukhi,
61 HB_Script_Gujarati,
62 HB_Script_Oriya,
63 HB_Script_Tamil,
64 HB_Script_Telugu,
65 HB_Script_Kannada,
66 HB_Script_Malayalam,
67 HB_Script_Sinhala,
68 HB_Script_Thai,
69 HB_Script_Lao,
70 HB_Script_Tibetan,
71 HB_Script_Myanmar,
72 HB_Script_Georgian,
73 HB_Script_Hangul,
74 HB_Script_Ogham,
75 HB_Script_Runic,
76 HB_Script_Khmer,
77 HB_Script_Nko,
78 HB_Script_Inherited,
79 HB_ScriptCount = HB_Script_Inherited
80 /*
81 HB_Script_Latin = Common,
82 HB_Script_Ethiopic = Common,
83 HB_Script_Cherokee = Common,
84 HB_Script_CanadianAboriginal = Common,
85 HB_Script_Mongolian = Common,
86 HB_Script_Hiragana = Common,
87 HB_Script_Katakana = Common,
88 HB_Script_Bopomofo = Common,
89 HB_Script_Han = Common,
90 HB_Script_Yi = Common,
91 HB_Script_OldItalic = Common,
92 HB_Script_Gothic = Common,
93 HB_Script_Deseret = Common,
94 HB_Script_Tagalog = Common,
95 HB_Script_Hanunoo = Common,
96 HB_Script_Buhid = Common,
97 HB_Script_Tagbanwa = Common,
98 HB_Script_Limbu = Common,
99 HB_Script_TaiLe = Common,
100 HB_Script_LinearB = Common,
101 HB_Script_Ugaritic = Common,
102 HB_Script_Shavian = Common,
103 HB_Script_Osmanya = Common,
104 HB_Script_Cypriot = Common,
105 HB_Script_Braille = Common,
106 HB_Script_Buginese = Common,
107 HB_Script_Coptic = Common,
108 HB_Script_NewTaiLue = Common,
109 HB_Script_Glagolitic = Common,
110 HB_Script_Tifinagh = Common,
111 HB_Script_SylotiNagri = Common,
112 HB_Script_OldPersian = Common,
113 HB_Script_Kharoshthi = Common,
114 HB_Script_Balinese = Common,
115 HB_Script_Cuneiform = Common,
116 HB_Script_Phoenician = Common,
117 HB_Script_PhagsPa = Common,
118 */
119} HB_Script;
120
121typedef struct
122{
123 hb_uint32 pos;
124 hb_uint32 length;
125 HB_Script script;
126 hb_uint8 bidiLevel;
127} HB_ScriptItem;
128
129
130typedef struct {
131 hb_bitfield graphemeBoundary : 1; /* Valid cursor position (for left/right arrow) */
132 hb_bitfield wordBreak : 1;
133 hb_bitfield sentenceBoundary : 1;
134 hb_bitfield lineBreak : 1;
135 hb_bitfield whiteSpace : 1; /* A unicode whitespace character */
136 hb_bitfield wordStart : 1;
137 hb_bitfield wordEnd : 1;
138 hb_bitfield mandatoryBreak : 1;
139} HB_CharAttributes;
140
141void HB_GetTailoredCharAttributes(const HB_UChar16 *string, hb_uint32 stringLength,
142 const HB_ScriptItem *items, hb_uint32 numItems,
143 HB_CharAttributes *attributes);
144
145
146typedef enum {
147 HB_LeftToRight = 0,
148 HB_RightToLeft = 1
149} HB_StringToGlyphsFlags;
150
151typedef enum {
152 HB_ShaperFlag_Default = 0,
153 HB_ShaperFlag_NoKerning = 1,
154 HB_ShaperFlag_UseDesignMetrics = 2
155} HB_ShaperFlag;
156
157/*
158 highest value means highest priority for justification. Justification is done by first inserting kashidas
159 starting with the highest priority positions, then stretching spaces, afterwards extending inter char
160 spacing, and last spacing between arabic words.
161 NoJustification is for example set for arabic where no Kashida can be inserted or for diacritics.
162*/
163typedef enum {
164 HB_NoJustification= 0, /* Justification can't be applied after this glyph */
165 HB_Arabic_Space = 1, /* This glyph represents a space inside arabic text */
166 HB_Character = 2, /* Inter-character justification point follows this glyph */
167 HB_Space = 4, /* This glyph represents a blank outside an Arabic run */
168 HB_Arabic_Normal = 7, /* Normal Middle-Of-Word glyph that connects to the right (begin) */
169 HB_Arabic_Waw = 8, /* Next character is final form of Waw/Ain/Qaf/Fa */
170 HB_Arabic_BaRa = 9, /* Next two chars are Ba + Ra/Ya/AlefMaksura */
171 HB_Arabic_Alef = 10, /* Next character is final form of Alef/Tah/Lam/Kaf/Gaf */
172 HB_Arabic_HaaDal = 11, /* Next character is final form of Haa/Dal/Taa Marbutah */
173 HB_Arabic_Seen = 12, /* Initial or Medial form Of Seen/Sad */
174 HB_Arabic_Kashida = 13 /* Kashida(U+640) in middle of word */
175} HB_JustificationClass;
176
177/* This structure is binary compatible with Uniscribe's SCRIPT_VISATTR. Would be nice to keep
178 * it like that. If this is a problem please tell Trolltech :)
179 */
180typedef struct {
181 hb_bitfield justification :4; /* Justification class */
182 hb_bitfield clusterStart :1; /* First glyph of representation of cluster */
183 hb_bitfield mark :1; /* needs to be positioned around base char */
184 hb_bitfield zeroWidth :1; /* ZWJ, ZWNJ etc, with no width */
185 hb_bitfield dontPrint :1;
186 hb_bitfield combiningClass :8;
187} HB_GlyphAttributes;
188
189typedef HB_Error (*HB_GetFontTableFunc)(void *font, HB_Tag tag, HB_Byte *buffer, HB_UInt *length);
190
191typedef struct HB_FaceRec_ {
192 HB_Bool isSymbolFont;
193
194 HB_GDEF gdef;
195 HB_GSUB gsub;
196 HB_GPOS gpos;
197 HB_Bool supported_scripts[HB_ScriptCount];
198 HB_Buffer buffer;
199 HB_Script current_script;
200 int current_flags; /* HB_ShaperFlags */
201 HB_Bool has_opentype_kerning;
202 HB_Bool glyphs_substituted;
203 HB_GlyphAttributes *tmpAttributes;
204 unsigned int *tmpLogClusters;
205 int length;
206 int orig_nglyphs;
207 void *font_for_init;
208 HB_GetFontTableFunc get_font_table_func;
209} HB_FaceRec;
210
211
212
213HB_Face HB_NewFace(void *font, HB_GetFontTableFunc tableFunc);
214HB_Face HB_AllocFace(void *font, HB_GetFontTableFunc tableFunc);
215HB_Face HB_LoadFace(HB_Face face);
216void HB_FreeFace(HB_Face face);
217
218typedef struct {
219 HB_Fixed x, y;
220 HB_Fixed width, height;
221 HB_Fixed xOffset, yOffset;
222} HB_GlyphMetrics;
223
224typedef enum {
225 HB_FontAscent
226} HB_FontMetric;
227
228typedef struct {
229 HB_Bool (*convertStringToGlyphIndices)(HB_Font font, const HB_UChar16 *string, hb_uint32 length, HB_Glyph *glyphs, hb_uint32 *numGlyphs, HB_Bool rightToLeft);
230 void (*getGlyphAdvances)(HB_Font font, const HB_Glyph *glyphs, hb_uint32 numGlyphs, HB_Fixed *advances, int flags /*HB_ShaperFlag*/);
231 HB_Bool (*canRender)(HB_Font font, const HB_UChar16 *string, hb_uint32 length);
232 /* implementation needs to make sure to load a scaled glyph, so /no/ FT_LOAD_NO_SCALE */
233 HB_Error (*getPointInOutline)(HB_Font font, HB_Glyph glyph, int flags /*HB_ShaperFlag*/, hb_uint32 point, HB_Fixed *xpos, HB_Fixed *ypos, hb_uint32 *nPoints);
234 void (*getGlyphMetrics)(HB_Font font, HB_Glyph glyph, HB_GlyphMetrics *metrics);
235 HB_Fixed (*getFontMetric)(HB_Font font, HB_FontMetric metric);
236} HB_FontClass;
237
238typedef struct HB_Font_ {
239 const HB_FontClass *klass;
240
241 /* Metrics */
242 HB_UShort x_ppem, y_ppem;
243 HB_16Dot16 x_scale, y_scale;
244
245 void *userData;
246} HB_FontRec;
247
248typedef struct HB_ShaperItem_ HB_ShaperItem;
249
250struct HB_ShaperItem_ {
251 const HB_UChar16 *string; /* input: the Unicode UTF16 text to be shaped */
252 hb_uint32 stringLength; /* input: the length of the input in 16-bit words */
253 HB_ScriptItem item; /* input: the current run to be shaped: a run of text all in the same script that is a substring of <string> */
254 HB_Font font; /* input: the font: scale, units and function pointers supplying glyph indices and metrics */
255 HB_Face face; /* input: the shaper state; current script, access to the OpenType tables , etc. */
256 int shaperFlags; /* input (unused) should be set to 0; intended to support flags defined in HB_ShaperFlag */
257 HB_Bool glyphIndicesPresent; /* input: true if the <glyphs> array contains glyph indices ready to be shaped */
258 hb_uint32 initialGlyphCount; /* input: if glyphIndicesPresent is true, the number of glyph indices in the <glyphs> array */
259
260 hb_uint32 num_glyphs; /* input: capacity of output arrays <glyphs>, <attributes>, <advances>, <offsets>, and <log_clusters>; */
261 /* output: required capacity (may be larger than actual capacity) */
262
263 HB_Glyph *glyphs; /* output: <num_glyphs> indices of shaped glyphs */
264 HB_GlyphAttributes *attributes; /* output: <num_glyphs> glyph attributes */
265 HB_Fixed *advances; /* output: <num_glyphs> advances */
266 HB_FixedPoint *offsets; /* output: <num_glyphs> offsets */
267 unsigned short *log_clusters; /* output: for each output glyph, the index in the input of the start of its logical cluster */
268
269 /* internal */
270 HB_Bool kerning_applied; /* output: true if kerning was applied by the shaper */
271};
272
273HB_Bool HB_ShapeItem(HB_ShaperItem *item);
274
275HB_END_HEADER
276
277#endif
278

source code of qtbase/src/3rdparty/harfbuzz/src/harfbuzz-shaper.h