| 1 | /* |
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| 2 | * Copyright 2021 Google LLC |
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| 3 | * |
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| 4 | * Use of this source code is governed by a BSD-style license that can be |
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| 5 | * found in the LICENSE file. |
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| 6 | */ |
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| 7 | |
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| 8 | #ifndef sktext_gpu_Slug_DEFINED |
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| 9 | #define sktext_gpu_Slug_DEFINED |
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| 10 | |
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| 11 | #include "include/core/SkRect.h" |
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| 12 | #include "include/core/SkRefCnt.h" |
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| 13 | #include "include/private/base/SkAPI.h" |
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| 14 | |
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| 15 | #include <cstddef> |
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| 16 | #include <cstdint> |
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| 17 | |
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| 18 | class SkCanvas; |
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| 19 | class SkData; |
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| 20 | class SkPaint; |
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| 21 | class SkReadBuffer; |
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| 22 | class SkStrikeClient; |
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| 23 | class SkTextBlob; |
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| 24 | class SkWriteBuffer; |
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| 25 | struct SkPoint; |
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| 26 | |
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| 27 | namespace sktext::gpu { |
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| 28 | // Slug encapsulates an SkTextBlob at a specific origin, using a specific paint. It can be |
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| 29 | // manipulated using matrix and clip changes to the canvas. If the canvas is transformed, then |
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| 30 | // the Slug will also transform with smaller glyphs using bi-linear interpolation to render. You |
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| 31 | // can think of a Slug as making a rubber stamp out of a SkTextBlob. |
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| 32 | class SK_API Slug : public SkRefCnt { |
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| 33 | public: |
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| 34 | // Return nullptr if the blob would not draw. This is not because of clipping, but because of |
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| 35 | // some paint optimization. The Slug is captured as if drawn using drawTextBlob. |
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| 36 | static sk_sp<Slug> ConvertBlob( |
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| 37 | SkCanvas* canvas, const SkTextBlob& blob, SkPoint origin, const SkPaint& paint); |
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| 38 | |
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| 39 | // Serialize the slug. |
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| 40 | sk_sp<SkData> serialize() const; |
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| 41 | size_t serialize(void* buffer, size_t size) const; |
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| 42 | |
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| 43 | // Set the client parameter to the appropriate SkStrikeClient when typeface ID translation |
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| 44 | // is needed. |
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| 45 | static sk_sp<Slug> Deserialize( |
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| 46 | const void* data, size_t size, const SkStrikeClient* client = nullptr); |
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| 47 | static sk_sp<Slug> MakeFromBuffer(SkReadBuffer& buffer); |
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| 48 | |
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| 49 | |
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| 50 | // Draw the Slug obeying the canvas's mapping and clipping. |
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| 51 | void draw(SkCanvas* canvas) const; |
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| 52 | |
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| 53 | virtual SkRect sourceBounds() const = 0; |
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| 54 | virtual SkRect sourceBoundsWithOrigin () const = 0; |
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| 55 | |
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| 56 | // The paint passed into ConvertBlob; this paint is used instead of the paint resulting from |
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| 57 | // the call to aboutToDraw because when we call draw(), the initial paint is needed to call |
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| 58 | // aboutToDraw again to get the layer right. |
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| 59 | virtual const SkPaint& initialPaint() const = 0; |
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| 60 | |
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| 61 | virtual void doFlatten(SkWriteBuffer&) const = 0; |
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| 62 | |
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| 63 | uint32_t uniqueID() const { return fUniqueID; } |
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| 64 | |
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| 65 | private: |
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| 66 | static uint32_t NextUniqueID(); |
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| 67 | const uint32_t fUniqueID{NextUniqueID()}; |
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| 68 | }; |
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| 69 | } // namespace sktext::gpu |
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| 70 | |
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| 71 | #endif // sktext_gpu_Slug_DEFINED |
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| 72 | |
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