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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 "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:
static GrStencilAndCoverTextContext* Create(GrContext*, SkGpuDevice*,
const SkDeviceProperties&);
virtual ~GrStencilAndCoverTextContext();
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,
};
GrPipelineBuilder fPipelineBuilder;
GrPipelineBuilder::AutoRestoreFragmentProcessors fStateRestore;
SkScalar fTextRatio;
float fTextInverseRatio;
SkGlyphCache* fGlyphCache;
GrPathRange* fGlyphs;
SkStrokeRec fStroke;
uint16_t fGlyphIndices[kGlyphBufferSize];
SkPoint fGlyphPositions[kGlyphBufferSize];
int fQueuedGlyphCount;
int fFallbackGlyphsIdx;
SkMatrix fContextInitialMatrix;
SkMatrix fViewMatrix;
SkMatrix fLocalMatrix;
bool fUsingDeviceSpaceGlyphs;
GrStencilAndCoverTextContext(GrContext*, SkGpuDevice*, const SkDeviceProperties&);
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&,
size_t textByteLength, RenderMode, const SkMatrix& viewMatrix,
const SkIRect& regionClipBounds);
bool mapToFallbackContext(SkMatrix* inverse);
void appendGlyph(const SkGlyph&, const SkPoint&);
void flush();
void finish();
};
#endif
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