src/gpu/GrBitmapTextContext.h

   1 /*
   2  * Copyright 2013 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 GrBitmapTextContext_DEFINED
   9 #define GrBitmapTextContext_DEFINED
  10
  11 #include "GrTextContext.h"
  12
  13 #include "GrGeometryProcessor.h"
  14
  15 class GrTextStrike;
  16
  17 /*
  18  * This class implements GrTextContext using standard bitmap fonts
  19  */
  20 class GrBitmapTextContext : public GrTextContext {
  21 public:
  22     static GrBitmapTextContext* Create(GrContext*, SkGpuDevice*,  const SkDeviceProperties&);
  23
  24     virtual ~GrBitmapTextContext() {}
  25
  26 private:
  27     GrTextStrike*                     fStrike;
  28     void*                             fVertices;
  29     int                               fCurrVertex;
  30     int                               fAllocVertexCount;
  31     int                               fTotalVertexCount;
  32     SkRect                            fVertexBounds;
  33     GrTexture*                        fCurrTexture;
  34     GrMaskFormat                      fCurrMaskFormat;
  35     SkAutoTUnref<const GrGeometryProcessor> fCachedGeometryProcessor;
  36     // Used to check whether fCachedEffect is still valid.
  37     uint32_t                          fEffectTextureUniqueID;
  38     SkMatrix                          fLocalMatrix;
  39
  40     GrBitmapTextContext(GrContext*, SkGpuDevice*, const SkDeviceProperties&);
  41
  42     bool canDraw(const GrRenderTarget*, const GrClip&, const GrPaint&,
  43                  const SkPaint&, const SkMatrix& viewMatrix) SK_OVERRIDE;
  44
  45     void onDrawText(GrRenderTarget*, const GrClip&, const GrPaint&, const SkPaint&,
  46                     const SkMatrix& viewMatrix, const char text[], size_t byteLength,
  47                     SkScalar x, SkScalar y, const SkIRect& regionClipBounds) SK_OVERRIDE;
  48     void onDrawPosText(GrRenderTarget*, const GrClip&, const GrPaint&, const SkPaint&,
  49                        const SkMatrix& viewMatrix,
  50                        const char text[], size_t byteLength,
  51                        const SkScalar pos[], int scalarsPerPosition,
  52                        const SkPoint& offset, const SkIRect& regionClipBounds) SK_OVERRIDE;
  53
  54     void init(GrRenderTarget*, const GrClip&, const GrPaint&, const SkPaint&,
  55               const SkIRect& regionClipBounds);
  56     void appendGlyph(GrGlyph::PackedID, SkFixed left, SkFixed top, GrFontScaler*);
  57     bool uploadGlyph(GrGlyph*, GrFontScaler*);
  58     void flush();                 // automatically called by destructor
  59     void finish();
  60 };
  61
  62 #endif