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/*
* 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 GrAtlasTextContext_DEFINED
#define GrAtlasTextContext_DEFINED
#include "GrTextContext.h"
#include "GrAtlasTextBlob.h"
#include "GrDistanceFieldAdjustTable.h"
#include "GrGeometryProcessor.h"
#include "SkTextBlobRunIterator.h"
#ifdef GR_TEST_UTILS
#include "GrBatchTest.h"
#endif
class GrDrawBatch;
class GrDrawContext;
class GrDrawTarget;
class GrPipelineBuilder;
class GrTextBlobCache;
class SkGlyph;
/*
* This class implements GrTextContext using standard bitmap fonts, and can also process textblobs.
*/
class GrAtlasTextContext : public GrTextContext {
public:
static GrAtlasTextContext* Create(GrContext*, const SkSurfaceProps&);
private:
GrAtlasTextContext(GrContext*, const SkSurfaceProps&);
~GrAtlasTextContext() override {}
bool canDraw(const SkPaint&, const SkMatrix& viewMatrix) override;
void onDrawText(GrDrawContext*, const GrClip&, const GrPaint&, const SkPaint&,
const SkMatrix& viewMatrix, const char text[], size_t byteLength,
SkScalar x, SkScalar y, const SkIRect& regionClipBounds) override;
void onDrawPosText(GrDrawContext*, 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) override;
void drawTextBlob(GrDrawContext*, const GrClip&, const SkPaint&,
const SkMatrix& viewMatrix, const SkTextBlob*, SkScalar x, SkScalar y,
SkDrawFilter*, const SkIRect& clipBounds) override;
typedef GrAtlasTextBlob::Run Run;
typedef Run::SubRunInfo PerSubRunInfo;
inline bool canDrawAsDistanceFields(const SkPaint&, const SkMatrix& viewMatrix);
GrAtlasTextBlob* setupDFBlob(int glyphCount, const SkPaint& origPaint,
const SkMatrix& viewMatrix, SkPaint* dfPaint,
SkScalar* textRatio);
void bmpAppendGlyph(GrAtlasTextBlob*, int runIndex, const SkGlyph&, int left, int top,
GrColor color, GrFontScaler*);
bool dfAppendGlyph(GrAtlasTextBlob*, int runIndex, const SkGlyph&, SkScalar sx, SkScalar sy,
GrColor color, GrFontScaler*, SkScalar textRatio,
const SkMatrix& viewMatrix);
// A helper for drawing BitmapText in a run of distance fields
inline void fallbackDrawPosText(GrAtlasTextBlob*, int runIndex,
GrColor color,
const SkPaint&, const SkMatrix& viewMatrix,
const SkTDArray<char>& fallbackTxt,
const SkTDArray<SkScalar>& fallbackPos,
int scalarsPerPosition,
const SkPoint& offset);
void internalDrawDFText(GrAtlasTextBlob*, int runIndex,
const SkPaint&,
GrColor color, const SkMatrix& viewMatrix,
const char text[], size_t byteLength,
SkScalar x, SkScalar y,
SkScalar textRatio, const SkPaint& origPaint);
void internalDrawDFPosText(GrAtlasTextBlob*, int runIndex,
const SkPaint&,
GrColor color, const SkMatrix& viewMatrix,
const char text[], size_t byteLength,
const SkScalar pos[], int scalarsPerPosition,
const SkPoint& offset,
SkScalar textRatio,
const SkPaint& origPaint);
// sets up the descriptor on the blob and returns a detached cache. Client must attach
inline static GrColor ComputeCanonicalColor(const SkPaint&, bool lcd);
void regenerateTextBlob(GrAtlasTextBlob* bmp, const SkPaint& skPaint, GrColor,
const SkMatrix& viewMatrix,
const SkTextBlob* blob, SkScalar x, SkScalar y,
SkDrawFilter* drawFilter,
const GrClip&);
inline static bool HasLCD(const SkTextBlob*);
inline void initDistanceFieldPaint(GrAtlasTextBlob*, SkPaint*, SkScalar* textRatio,
const SkMatrix&);
// Test methods
// TODO this is really ugly. It'd be much nicer if positioning could be moved to batch
inline GrAtlasTextBlob* createDrawTextBlob(const GrPaint&,
const SkPaint&, const SkMatrix& viewMatrix,
const char text[], size_t byteLength,
SkScalar x, SkScalar y);
inline GrAtlasTextBlob* createDrawPosTextBlob(const GrPaint&,
const SkPaint&, const SkMatrix& viewMatrix,
const char text[], size_t byteLength,
const SkScalar pos[], int scalarsPerPosition,
const SkPoint& offset);
const GrDistanceFieldAdjustTable* dfAdjustTable() const { return fDistanceAdjustTable; }
GrBatchTextStrike* fCurrStrike;
GrTextBlobCache* fCache;
SkAutoTUnref<const GrDistanceFieldAdjustTable> fDistanceAdjustTable;
#ifdef GR_TEST_UTILS
DRAW_BATCH_TEST_FRIEND(TextBlobBatch);
#endif
typedef GrTextContext INHERITED;
};
#endif
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