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      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 GrDistanceFieldTextContext_DEFINED
      9 #define GrDistanceFieldTextContext_DEFINED
     10 
     11 #include "GrTextContext.h"
     12 
     13 class GrTextStrike;
     14 
     15 /*
     16  * This class implements GrTextContext using distance field fonts
     17  */
     18 class GrDistanceFieldTextContext : public GrTextContext {
     19 public:
     20     GrDistanceFieldTextContext(GrContext*, const GrPaint&, SkColor, SkScalar textRatio);
     21     virtual ~GrDistanceFieldTextContext();
     22 
     23     virtual void drawPackedGlyph(GrGlyph::PackedID, GrFixed left, GrFixed top,
     24                                  GrFontScaler*) SK_OVERRIDE;
     25 
     26 private:
     27     GrTextStrike*           fStrike;
     28     SkScalar                fTextRatio;
     29 
     30     void flushGlyphs();                 // automatically called by destructor
     31 
     32     enum {
     33         kMinRequestedGlyphs      = 1,
     34         kDefaultRequestedGlyphs  = 64,
     35         kMinRequestedVerts       = kMinRequestedGlyphs * 4,
     36         kDefaultRequestedVerts   = kDefaultRequestedGlyphs * 4,
     37     };
     38 
     39     SkColor                 fSkPaintColor;
     40     SkPoint*                fVertices;
     41     int32_t                 fMaxVertices;
     42     GrTexture*              fCurrTexture;
     43     int                     fCurrVertex;
     44 };
     45 
     46 #endif
     47