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/*
* 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 GrTextStrike;
/*
* This class implements GrTextContext using distance field fonts
*/
class GrDistanceFieldTextContext : public GrTextContext {
public:
GrDistanceFieldTextContext(GrContext*, const SkDeviceProperties&, bool enable);
virtual ~GrDistanceFieldTextContext();
virtual void drawText(const GrPaint&, const SkPaint&, const char text[], size_t byteLength,
SkScalar x, SkScalar y) SK_OVERRIDE;
virtual void drawPosText(const GrPaint&, const SkPaint&,
const char text[], size_t byteLength,
const SkScalar pos[], SkScalar constY,
int scalarsPerPosition) SK_OVERRIDE;
virtual bool canDraw(const SkPaint& paint) SK_OVERRIDE;
private:
GrTextStrike* fStrike;
SkScalar fTextRatio;
bool fUseLCDText;
bool fEnableDFRendering;
SkAutoTUnref<GrEffect> fCachedEffect;
// Used to check whether fCachedEffect is still valid.
uint32_t fEffectTextureUniqueID;
SkColor fEffectColor;
uint32_t fEffectFlags;
GrTexture* fGammaTexture;
void init(const GrPaint&, const SkPaint&);
void drawPackedGlyph(GrGlyph::PackedID, SkFixed left, SkFixed top, GrFontScaler*);
void flushGlyphs(); // automatically called by destructor
void setupCoverageEffect(const SkColor& filteredColor);
void finish();
enum {
kMinRequestedGlyphs = 1,
kDefaultRequestedGlyphs = 64,
kMinRequestedVerts = kMinRequestedGlyphs * 4,
kDefaultRequestedVerts = kDefaultRequestedGlyphs * 4,
};
void* fVertices;
int32_t fMaxVertices;
GrTexture* fCurrTexture;
int fCurrVertex;
SkRect fVertexBounds;
};
#endif
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