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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 "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.
* TODO replace GrBitmapTextContext
*/
class GrAtlasTextContext : public GrTextContext {
public:
static GrAtlasTextContext* Create(GrContext*, const SkSurfaceProps&);
private:
GrAtlasTextContext(GrContext*, const SkSurfaceProps&);
~GrAtlasTextContext() override {}
bool canDraw(const GrRenderTarget*, const GrClip&, const GrPaint&,
const SkPaint&, const SkMatrix& viewMatrix) override;
void onDrawText(GrDrawContext*, GrRenderTarget*, 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*, 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) override;
void drawTextBlob(GrDrawContext*, GrRenderTarget*, 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*, const SkIRect& clipRect);
bool dfAppendGlyph(GrAtlasTextBlob*, int runIndex, const SkGlyph&, SkScalar sx, SkScalar sy,
GrColor color, GrFontScaler*, const SkIRect& clipRect, SkScalar textRatio,
const SkMatrix& viewMatrix);
inline void appendGlyphPath(GrAtlasTextBlob*, GrGlyph*, GrFontScaler*, const SkGlyph&,
SkScalar x, SkScalar y, SkScalar scale = 1.0f,
bool applyVM = false);
inline void appendGlyphCommon(GrAtlasTextBlob*, Run*, Run::SubRunInfo*,
const SkRect& positions, GrColor color,
size_t vertexStride, bool useVertexColor,
GrGlyph*);
inline void flushRunAsPaths(GrDrawContext*, GrRenderTarget*,
const SkTextBlobRunIterator&, const GrClip& clip,
const SkPaint&, SkDrawFilter*,
const SkMatrix& viewMatrix, const SkIRect& clipBounds, SkScalar x,
SkScalar y);
inline GrDrawBatch* createBatch(GrAtlasTextBlob*, const PerSubRunInfo&,
int glyphCount, int run, int subRun,
GrColor, SkScalar transX, SkScalar transY,
const SkPaint&);
inline void flushRun(GrDrawContext*, GrPipelineBuilder*, GrAtlasTextBlob*, int run, GrColor,
SkScalar transX, SkScalar transY, const SkPaint&);
inline void flushBigGlyphs(GrAtlasTextBlob* cacheBlob, GrDrawContext*, GrRenderTarget*,
const GrClip& clip, const SkPaint& skPaint,
SkScalar transX, SkScalar transY, const SkIRect& clipBounds);
// We have to flush SkTextBlobs differently from drawText / drawPosText
void flush(const SkTextBlob*, GrAtlasTextBlob*, GrDrawContext*, GrRenderTarget*,
const SkPaint&, const GrPaint&, SkDrawFilter*, const GrClip&,
const SkMatrix& viewMatrix, const SkIRect& clipBounds, SkScalar x, SkScalar y,
SkScalar transX, SkScalar transY);
void flush(GrAtlasTextBlob*, GrDrawContext*, GrRenderTarget*, const SkPaint&,
const GrPaint&, const GrClip&, const SkIRect& clipBounds);
// A helper for drawing BitmapText in a run of distance fields
inline void fallbackDrawPosText(GrAtlasTextBlob*, int runIndex,
GrRenderTarget*, const GrClip&, GrColor color,
const SkPaint&, const SkMatrix& viewMatrix,
const SkTDArray<char>& fallbackTxt,
const SkTDArray<SkScalar>& fallbackPos,
int scalarsPerPosition,
const SkPoint& offset,
const SkIRect& clipRect);
void internalDrawBMPText(GrAtlasTextBlob*, int runIndex, SkGlyphCache*, const SkPaint&,
GrColor color, const SkMatrix& viewMatrix,
const char text[], size_t byteLength,
SkScalar x, SkScalar y, const SkIRect& clipRect);
void internalDrawBMPPosText(GrAtlasTextBlob*, int runIndex, SkGlyphCache*, const SkPaint&,
GrColor color, const SkMatrix& viewMatrix,
const char text[], size_t byteLength,
const SkScalar pos[], int scalarsPerPosition,
const SkPoint& offset, const SkIRect& clipRect);
void internalDrawDFText(GrAtlasTextBlob*, int runIndex, const SkPaint&,
GrColor color, const SkMatrix& viewMatrix,
const char text[], size_t byteLength,
SkScalar x, SkScalar y, const SkIRect& clipRect,
SkScalar textRatio,
SkTDArray<char>* fallbackTxt,
SkTDArray<SkScalar>* fallbackPos,
SkPoint* offset, 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, const SkIRect& clipRect,
SkScalar textRatio,
SkTDArray<char>* fallbackTxt,
SkTDArray<SkScalar>* fallbackPos);
// sets up the descriptor on the blob and returns a detached cache. Client must attach
inline static GrColor ComputeCanonicalColor(const SkPaint&, bool lcd);
inline SkGlyphCache* setupCache(Run*, const SkPaint&, const SkMatrix* viewMatrix, bool noGamma);
static inline bool MustRegenerateBlob(SkScalar* outTransX, SkScalar* outTransY,
const GrAtlasTextBlob&, const SkPaint&, GrColor,
const SkMaskFilter::BlurRec&,
const SkMatrix& viewMatrix, SkScalar x, SkScalar y);
void regenerateTextBlob(GrAtlasTextBlob* bmp, const SkPaint& skPaint, GrColor,
const SkMatrix& viewMatrix,
const SkTextBlob* blob, SkScalar x, SkScalar y,
SkDrawFilter* drawFilter, const SkIRect& clipRect, GrRenderTarget*,
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(GrRenderTarget*, const GrClip&, const GrPaint&,
const SkPaint&, const SkMatrix& viewMatrix,
const char text[], size_t byteLength,
SkScalar x, SkScalar y,
const SkIRect& regionClipBounds);
inline GrAtlasTextBlob* createDrawPosTextBlob(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);
// Distance field text needs this table to compute a value for use in the fragment shader.
// Because the GrAtlasTextContext can go out of scope before the final flush, this needs to be
// refcnted and malloced
struct DistanceAdjustTable : public SkNVRefCnt<DistanceAdjustTable> {
DistanceAdjustTable() { this->buildDistanceAdjustTable(); }
~DistanceAdjustTable() { delete[] fTable; }
const SkScalar& operator[] (int i) const {
return fTable[i];
}
private:
void buildDistanceAdjustTable();
SkScalar* fTable;
};
GrBatchTextStrike* fCurrStrike;
GrTextBlobCache* fCache;
SkAutoTUnref<const DistanceAdjustTable> fDistanceAdjustTable;
friend class GrTextBlobCache;
friend class TextBatch;
#ifdef GR_TEST_UTILS
DRAW_BATCH_TEST_FRIEND(TextBlobBatch);
#endif
typedef GrTextContext INHERITED;
};
#endif
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