| /* |
| * Copyright 2015 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef GrTextUtils_DEFINED |
| #define GrTextUtils_DEFINED |
| |
| #include "GrColor.h" |
| #include "GrColorSpaceInfo.h" |
| #include "SkColorFilter.h" |
| #include "SkGr.h" |
| #include "SkPaint.h" |
| #include "SkScalar.h" |
| #include "SkTLazy.h" |
| |
| class GrAtlasGlyphCache; |
| class GrAtlasTextBlob; |
| class GrAtlasTextStrike; |
| class GrClip; |
| class GrColorSpaceXform; |
| class GrContext; |
| class GrPaint; |
| class GrRenderTargetContext; |
| class GrShaderCaps; |
| class SkColorSpace; |
| class SkDrawFilter; |
| class SkGlyph; |
| class SkMatrix; |
| struct SkIRect; |
| struct SkPoint; |
| class SkGlyphCache; |
| class SkTextBlobRunIterator; |
| class SkSurfaceProps; |
| |
| /** |
| * A class to house a bunch of common text utilities. This class should *ONLY* have static |
| * functions. It is not a namespace only because we wish to friend SkPaint |
| */ |
| class GrTextUtils { |
| public: |
| /** |
| * This is used to wrap a SkPaint and its post-color filter color. It is also used by RunPaint |
| * (below). This keeps a pointer to the SkPaint it is initialized with and expects it to remain |
| * const. It is also used to transform to GrPaint. |
| */ |
| class Paint { |
| public: |
| explicit Paint(const SkPaint* paint, const GrColorSpaceInfo* dstColorSpaceInfo) |
| : fPaint(paint), fDstColorSpaceInfo(dstColorSpaceInfo) { |
| this->initFilteredColor(); |
| } |
| |
| // These expose the paint's color run through its color filter (if any). This is only valid |
| // when drawing grayscale/lcd glyph masks and not when drawing color glyphs. |
| GrColor filteredPremulColor() const { return fFilteredPremulColor; } |
| SkColor luminanceColor() const { return fPaint->computeLuminanceColor(); } |
| |
| const SkPaint& skPaint() const { return *fPaint; } |
| operator const SkPaint&() const { return this->skPaint(); } |
| |
| bool toGrPaint(GrMaskFormat, GrRenderTargetContext*, const SkMatrix& viewMatrix, |
| GrPaint*) const; |
| |
| // Just for RunPaint's constructor |
| const GrColorSpaceInfo* dstColorSpaceInfo() const { return fDstColorSpaceInfo; } |
| |
| protected: |
| void initFilteredColor(); |
| Paint() = default; |
| const SkPaint* fPaint; |
| const GrColorSpaceInfo* fDstColorSpaceInfo; |
| // This is the paint's color run through its color filter, if present. This color should |
| // be used except when rendering bitmap text, in which case the bitmap must be filtered in |
| // the fragment shader. |
| GrColor fFilteredPremulColor; |
| }; |
| |
| /** |
| * An extension of Paint that incorporated per-run modifications to the paint text settings and |
| * application of a draw filter. It expects its constructor arguments to remain alive and const |
| * during its lifetime. |
| */ |
| class RunPaint : public Paint { |
| public: |
| RunPaint(const Paint* paint, SkDrawFilter* filter, const SkSurfaceProps& props) |
| : fOriginalPaint(paint), fFilter(filter), fProps(props) { |
| // Initially we represent the original paint. |
| fPaint = &fOriginalPaint->skPaint(); |
| fDstColorSpaceInfo = fOriginalPaint->dstColorSpaceInfo(); |
| fFilteredPremulColor = fOriginalPaint->filteredPremulColor(); |
| } |
| |
| bool modifyForRun(const SkTextBlobRunIterator&); |
| |
| private: |
| SkTLazy<SkPaint> fModifiedPaint; |
| const Paint* fOriginalPaint; |
| SkDrawFilter* fFilter; |
| const SkSurfaceProps& fProps; |
| }; |
| |
| // Functions for appending BMP text to GrAtlasTextBlob |
| static void DrawBmpText(GrAtlasTextBlob*, int runIndex, GrAtlasGlyphCache*, |
| const SkSurfaceProps&, const Paint& paint, uint32_t scalerContextFlags, |
| const SkMatrix& viewMatrix, const char text[], size_t byteLength, |
| SkScalar x, SkScalar y); |
| |
| static void DrawBmpPosText(GrAtlasTextBlob*, int runIndex, GrAtlasGlyphCache*, |
| const SkSurfaceProps&, const Paint& paint, |
| uint32_t scalerContextFlags, const SkMatrix& viewMatrix, |
| const char text[], size_t byteLength, const SkScalar pos[], |
| int scalarsPerPosition, const SkPoint& offset); |
| |
| // functions for appending distance field text |
| static bool CanDrawAsDistanceFields(const SkPaint& skPaint, const SkMatrix& viewMatrix, |
| const SkSurfaceProps& props, const GrShaderCaps& caps); |
| |
| static void DrawDFText(GrAtlasTextBlob* blob, int runIndex, GrAtlasGlyphCache*, |
| const SkSurfaceProps&, const Paint& paint, uint32_t scalerContextFlags, |
| const SkMatrix& viewMatrix, const char text[], size_t byteLength, |
| SkScalar x, SkScalar y); |
| |
| static void DrawDFPosText(GrAtlasTextBlob* blob, int runIndex, GrAtlasGlyphCache*, |
| const SkSurfaceProps&, const Paint& paint, |
| uint32_t scalerContextFlags, const SkMatrix& viewMatrix, |
| const char text[], size_t byteLength, const SkScalar pos[], |
| int scalarsPerPosition, const SkPoint& offset); |
| |
| // Functions for drawing text as paths |
| static void DrawTextAsPath(GrContext*, GrRenderTargetContext*, const GrClip& clip, |
| const SkPaint& paint, const SkMatrix& viewMatrix, const char text[], |
| size_t byteLength, SkScalar x, SkScalar y, |
| const SkIRect& clipBounds); |
| |
| static void DrawPosTextAsPath(GrContext* context, GrRenderTargetContext* rtc, |
| const SkSurfaceProps& props, const GrClip& clip, |
| const SkPaint& paint, const SkMatrix& viewMatrix, |
| const char text[], size_t byteLength, const SkScalar pos[], |
| int scalarsPerPosition, const SkPoint& offset, |
| const SkIRect& clipBounds); |
| |
| static bool ShouldDisableLCD(const SkPaint& paint); |
| |
| |
| private: |
| static uint32_t FilterTextFlags(const SkSurfaceProps& surfaceProps, const SkPaint& paint); |
| |
| static void InitDistanceFieldPaint(GrAtlasTextBlob* blob, |
| SkPaint* skPaint, |
| SkScalar* textRatio, |
| const SkMatrix& viewMatrix); |
| |
| static void BmpAppendGlyph(GrAtlasTextBlob*, int runIndex, GrAtlasGlyphCache*, |
| GrAtlasTextStrike**, const SkGlyph&, int left, int top, |
| GrColor color, SkGlyphCache*); |
| |
| static bool DfAppendGlyph(GrAtlasTextBlob*, int runIndex, GrAtlasGlyphCache*, |
| GrAtlasTextStrike**, const SkGlyph&, |
| SkScalar sx, SkScalar sy, GrColor color, |
| SkGlyphCache* cache, |
| SkScalar textRatio, const SkMatrix& viewMatrix); |
| }; |
| |
| #endif |