1 /* 2 * Copyright 2010 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef GrTextContext_DEFINED 9 #define GrTextContext_DEFINED 10 11 #include "GrClip.h" 12 #include "GrGlyph.h" 13 #include "GrPaint.h" 14 #include "SkDeviceProperties.h" 15 #include "SkPostConfig.h" 16 17 class GrClip; 18 class GrContext; 19 class GrDrawTarget; 20 class GrFontScaler; 21 class SkDrawFilter; 22 class SkGpuDevice; 23 class SkTextBlob; 24 25 /* 26 * This class wraps the state for a single text render 27 */ 28 class GrTextContext { 29 public: 30 virtual ~GrTextContext(); 31 32 void drawText(GrRenderTarget* rt, const GrClip&, const GrPaint&, const SkPaint&, 33 const SkMatrix& viewMatrix, const char text[], size_t byteLength, SkScalar x, 34 SkScalar y, const SkIRect& clipBounds); 35 void drawPosText(GrRenderTarget* rt, const GrClip&, const GrPaint&, const SkPaint&, 36 const SkMatrix& viewMatrix, 37 const char text[], size_t byteLength, 38 const SkScalar pos[], int scalarsPerPosition, 39 const SkPoint& offset, const SkIRect& clipBounds); 40 virtual void drawTextBlob(GrRenderTarget*, const GrClip&, const SkPaint&, 41 const SkMatrix& viewMatrix, const SkTextBlob*, SkScalar x, SkScalar y, 42 SkDrawFilter*, const SkIRect& clipBounds); 43 44 protected: 45 GrTextContext* fFallbackTextContext; 46 GrContext* fContext; 47 // TODO we probably don't really need to store a back pointer to the owning SkGpuDevice, except 48 // we need to be able to call drawPath on it in the event no other text context can draw the 49 // text. We might be able to move this logic to context though. This is unreffed because 50 // GrTextContext is completely owned by SkGpuDevice 51 SkGpuDevice* fGpuDevice; 52 SkDeviceProperties fDeviceProperties; 53 54 SkAutoTUnref<GrRenderTarget> fRenderTarget; 55 GrClip fClip; 56 GrDrawTarget* fDrawTarget; 57 SkIRect fClipRect; 58 SkIRect fRegionClipBounds; 59 GrPaint fPaint; 60 SkPaint fSkPaint; 61 62 GrTextContext(GrContext*, SkGpuDevice*, const SkDeviceProperties&); 63 64 virtual bool canDraw(const GrRenderTarget*, const GrClip&, const GrPaint&, 65 const SkPaint&, const SkMatrix& viewMatrix) = 0; 66 67 virtual void onDrawText(GrRenderTarget*, const GrClip&, const GrPaint&, const SkPaint&, 68 const SkMatrix& viewMatrix, const char text[], size_t byteLength, 69 SkScalar x, SkScalar y, const SkIRect& clipBounds) = 0; 70 virtual void onDrawPosText(GrRenderTarget*, const GrClip&, const GrPaint&, const SkPaint&, 71 const SkMatrix& viewMatrix, 72 const char text[], size_t byteLength, 73 const SkScalar pos[], int scalarsPerPosition, 74 const SkPoint& offset, const SkIRect& clipBounds) = 0; 75 76 void drawTextAsPath(const SkPaint& origPaint, const SkMatrix& viewMatrix, 77 const char text[], size_t byteLength, SkScalar x, SkScalar y, 78 const SkIRect& clipBounds); 79 void drawPosTextAsPath(const SkPaint& origPaint, const SkMatrix& viewMatrix, 80 const char text[], size_t byteLength, 81 const SkScalar pos[], int scalarsPerPosition, 82 const SkPoint& offset, const SkIRect& clipBounds); 83 84 void init(GrRenderTarget*, const GrClip&, const GrPaint&, const SkPaint&, 85 const SkIRect& regionClipBounds); 86 void finish() { fDrawTarget = NULL; } 87 88 static GrFontScaler* GetGrFontScaler(SkGlyphCache* cache); 89 // sets extent in stopVector and returns glyph count 90 static int MeasureText(SkGlyphCache* cache, SkDrawCacheProc glyphCacheProc, 91 const char text[], size_t byteLength, SkVector* stopVector); 92 93 friend class BitmapTextBatch; 94 }; 95 96 #endif 97
