michael@0: /*
michael@0:  * Copyright 2013 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #ifndef GrDistanceFieldTextContext_DEFINED
michael@0: #define GrDistanceFieldTextContext_DEFINED
michael@0: 
michael@0: #include "GrTextContext.h"
michael@0: 
michael@0: class GrTextStrike;
michael@0: 
michael@0: /*
michael@0:  * This class implements GrTextContext using distance field fonts
michael@0:  */
michael@0: class GrDistanceFieldTextContext : public GrTextContext {
michael@0: public:
michael@0:     GrDistanceFieldTextContext(GrContext*, const SkDeviceProperties&);
michael@0:     virtual ~GrDistanceFieldTextContext();
michael@0: 
michael@0:     virtual void drawText(const GrPaint&, const SkPaint&, const char text[], size_t byteLength,
michael@0:                           SkScalar x, SkScalar y) SK_OVERRIDE;
michael@0:     virtual void drawPosText(const GrPaint&, const SkPaint&,
michael@0:                              const char text[], size_t byteLength,
michael@0:                              const SkScalar pos[], SkScalar constY,
michael@0:                              int scalarsPerPosition) SK_OVERRIDE;
michael@0: 
michael@0:     virtual bool canDraw(const SkPaint& paint) SK_OVERRIDE;
michael@0: 
michael@0: private:
michael@0:     GrTextStrike*           fStrike;
michael@0:     SkScalar                fTextRatio;
michael@0: 
michael@0:     void init(const GrPaint&, const SkPaint&);
michael@0:     void drawPackedGlyph(GrGlyph::PackedID, GrFixed left, GrFixed top, GrFontScaler*);
michael@0:     void flushGlyphs();                 // automatically called by destructor
michael@0:     void finish();
michael@0: 
michael@0:     enum {
michael@0:         kMinRequestedGlyphs      = 1,
michael@0:         kDefaultRequestedGlyphs  = 64,
michael@0:         kMinRequestedVerts       = kMinRequestedGlyphs * 4,
michael@0:         kDefaultRequestedVerts   = kDefaultRequestedGlyphs * 4,
michael@0:     };
michael@0: 
michael@0:     SkPoint*                fVertices;
michael@0:     int32_t                 fMaxVertices;
michael@0:     GrTexture*              fCurrTexture;
michael@0:     int                     fCurrVertex;
michael@0: };
michael@0: 
michael@0: #endif