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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrStencilAndCoverTextContext_DEFINED
#define GrStencilAndCoverTextContext_DEFINED
#include "GrTextContext.h"
#include "GrDrawState.h"
#include "GrDrawTarget.h"
#include "SkStrokeRec.h"
class GrTextStrike;
class GrPath;
class GrPathRange;
/*
* This class implements text rendering using stencil and cover path rendering
* (by the means of GrDrawTarget::drawPath).
* This class exposes the functionality through GrTextContext interface.
*/
class GrStencilAndCoverTextContext : public GrTextContext {
public:
GrStencilAndCoverTextContext(GrContext*, const SkDeviceProperties&);
virtual ~GrStencilAndCoverTextContext();
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:
static const int kGlyphBufferSize = 1024;
enum RenderMode {
/**
* This is the render mode used by drawText(), which is mainly used by
* the Skia unit tests. It tries match the other text backends exactly,
* with the exception of not implementing LCD text, and doing anti-
* aliasing with the built-in MSAA.
*/
kMaxAccuracy_RenderMode,
/**
* This is the render mode used by drawPosText(). It ignores hinting and
* LCD text, even if the client provided positions for hinted glyphs,
* and renders from a canonically-sized, generic set of paths for the
* given typeface. In the future we should work out a system for the
* client to know it should not provide hinted glyph positions. This
* render mode also tries to use GPU stroking for fake bold, even when
* SK_USE_FREETYPE_EMBOLDEN is set.
*/
kMaxPerformance_RenderMode,
};
void init(const GrPaint&, const SkPaint&, size_t textByteLength,
RenderMode, SkScalar textTranslateY = 0);
void initGlyphs(SkGlyphCache* cache);
void appendGlyph(uint16_t glyphID, float x);
void appendGlyph(uint16_t glyphID, float x, float y);
void flush();
void finish();
GrDrawState::AutoRestoreEffects fStateRestore;
SkScalar fTextRatio;
float fTextInverseRatio;
SkGlyphCache* fGlyphCache;
GrPathRange* fGlyphs;
uint32_t fIndexBuffer[kGlyphBufferSize];
float fTransformBuffer[2 * kGlyphBufferSize];
GrDrawTarget::PathTransformType fTransformType;
int fPendingGlyphCount;
SkMatrix fContextInitialMatrix;
bool fNeedsDeviceSpaceGlyphs;
};
#endif
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