| /* |
| * Copyright 2013 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef GrDistanceFieldTextContext_DEFINED |
| #define GrDistanceFieldTextContext_DEFINED |
| |
| #include "GrTextContext.h" |
| |
| class GrGeometryProcessor; |
| class GrTextStrike; |
| |
| /* |
| * This class implements GrTextContext using distance field fonts |
| */ |
| class GrDistanceFieldTextContext : public GrTextContext { |
| public: |
| static GrDistanceFieldTextContext* Create(GrContext*, SkGpuDevice*, const SkDeviceProperties&, |
| bool enable); |
| |
| virtual ~GrDistanceFieldTextContext(); |
| |
| private: |
| enum { |
| kMinRequestedGlyphs = 1, |
| kDefaultRequestedGlyphs = 64, |
| kMinRequestedVerts = kMinRequestedGlyphs * 4, |
| kDefaultRequestedVerts = kDefaultRequestedGlyphs * 4, |
| }; |
| |
| GrTextStrike* fStrike; |
| SkScalar fTextRatio; |
| bool fUseLCDText; |
| bool fEnableDFRendering; |
| SkAutoTUnref<GrGeometryProcessor> fCachedGeometryProcessor; |
| // Used to check whether fCachedEffect is still valid. |
| uint32_t fEffectTextureUniqueID; |
| SkColor fEffectColor; |
| uint32_t fEffectFlags; |
| GrTexture* fGammaTexture; |
| void* fVertices; |
| int fCurrVertex; |
| int fAllocVertexCount; |
| int fTotalVertexCount; |
| GrTexture* fCurrTexture; |
| SkRect fVertexBounds; |
| SkMatrix fViewMatrix; |
| |
| GrDistanceFieldTextContext(GrContext*, SkGpuDevice*, const SkDeviceProperties&, bool enable); |
| |
| bool canDraw(const GrRenderTarget*, const GrClip&, const GrPaint&, |
| const SkPaint&, const SkMatrix& viewMatrix) SK_OVERRIDE; |
| |
| void onDrawText(GrRenderTarget*, const GrClip&, const GrPaint&, const SkPaint&, |
| const SkMatrix& viewMatrix, |
| const char text[], size_t byteLength, |
| SkScalar x, SkScalar y, const SkIRect& regionClipBounds) SK_OVERRIDE; |
| void onDrawPosText(GrRenderTarget*, const GrClip&, const GrPaint&, const SkPaint&, |
| const SkMatrix& viewMatrix, |
| const char text[], size_t byteLength, |
| const SkScalar pos[], int scalarsPerPosition, |
| const SkPoint& offset, const SkIRect& regionClipBounds) SK_OVERRIDE; |
| |
| void init(GrRenderTarget*, const GrClip&, const GrPaint&, const SkPaint&, |
| const SkIRect& regionClipBounds); |
| bool appendGlyph(GrGlyph::PackedID, SkScalar left, SkScalar top, GrFontScaler*); |
| bool uploadGlyph(GrGlyph*, GrFontScaler*); |
| void setupCoverageEffect(const SkColor& filteredColor); |
| void flush(); // automatically called by destructor |
| void finish(); |
| }; |
| |
| #endif |