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/*
* Copyright 2010 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrTextContext_DEFINED
#define GrTextContext_DEFINED
#include "GrClip.h"
#include "GrGlyph.h"
#include "GrPaint.h"
#include "SkDeviceProperties.h"
#include "SkPostConfig.h"
class GrClip;
class GrContext;
class GrDrawTarget;
class GrFontScaler;
class SkDrawFilter;
class SkGpuDevice;
class SkTextBlob;
// For testing textblobs on GPU.
//#define USE_BITMAP_TEXTBLOBS
/*
* This class wraps the state for a single text render
*/
class GrTextContext {
public:
virtual ~GrTextContext();
void drawText(GrRenderTarget* rt, const GrClip&, const GrPaint&, const SkPaint&,
const SkMatrix& viewMatrix, const char text[], size_t byteLength, SkScalar x,
SkScalar y, const SkIRect& clipBounds);
void drawPosText(GrRenderTarget* rt, 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& clipBounds);
virtual void drawTextBlob(GrRenderTarget*, const GrClip&, const SkPaint&,
const SkMatrix& viewMatrix, const SkTextBlob*, SkScalar x, SkScalar y,
SkDrawFilter*, const SkIRect& clipBounds);
protected:
GrTextContext* fFallbackTextContext;
GrContext* fContext;
// TODO we probably don't really need to store a back pointer to the owning SkGpuDevice, except
// we need to be able to call drawPath on it in the event no other text context can draw the
// text. We might be able to move this logic to context though. This is unreffed because
// GrTextContext is completely owned by SkGpuDevice
SkGpuDevice* fGpuDevice;
SkDeviceProperties fDeviceProperties;
SkAutoTUnref<GrRenderTarget> fRenderTarget;
GrClip fClip;
GrDrawTarget* fDrawTarget;
SkIRect fClipRect;
SkIRect fRegionClipBounds;
GrPaint fPaint;
SkPaint fSkPaint;
GrTextContext(GrContext*, SkGpuDevice*, const SkDeviceProperties&);
virtual bool canDraw(const GrRenderTarget*, const GrClip&, const GrPaint&,
const SkPaint&, const SkMatrix& viewMatrix) = 0;
virtual void onDrawText(GrRenderTarget*, const GrClip&, const GrPaint&, const SkPaint&,
const SkMatrix& viewMatrix, const char text[], size_t byteLength,
SkScalar x, SkScalar y, const SkIRect& clipBounds) = 0;
virtual 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& clipBounds) = 0;
void drawTextAsPath(const SkPaint& origPaint, const SkMatrix& viewMatrix,
const char text[], size_t byteLength, SkScalar x, SkScalar y,
const SkIRect& clipBounds);
void drawPosTextAsPath(const SkPaint& origPaint, const SkMatrix& viewMatrix,
const char text[], size_t byteLength,
const SkScalar pos[], int scalarsPerPosition,
const SkPoint& offset, const SkIRect& clipBounds);
void init(GrRenderTarget*, const GrClip&, const GrPaint&, const SkPaint&,
const SkIRect& regionClipBounds);
void finish() { fDrawTarget = NULL; }
static GrFontScaler* GetGrFontScaler(SkGlyphCache* cache);
// sets extent in stopVector and returns glyph count
static int MeasureText(SkGlyphCache* cache, SkDrawCacheProc glyphCacheProc,
const char text[], size_t byteLength, SkVector* stopVector);
friend class BitmapTextBatch;
};
#endif
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