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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 GrFontScaler_DEFINED
#define GrFontScaler_DEFINED
#include "GrGlyph.h"
#include "GrTypes.h"
#include "SkDescriptor.h"
class SkGlyph;
class SkPath;
/*
* Wrapper class to turn a font cache descriptor into a key
* for GrFontScaler-related lookups
*/
class GrFontDescKey : public SkRefCnt {
public:
explicit GrFontDescKey(const SkDescriptor& desc) : fDesc(desc), fHash(desc.getChecksum()) {}
uint32_t getHash() const { return fHash; }
bool operator==(const GrFontDescKey& rh) const {
return fHash == rh.fHash && fDesc.getDesc()->equals(*rh.fDesc.getDesc());
}
private:
SkAutoDescriptor fDesc;
uint32_t fHash;
typedef SkRefCnt INHERITED;
};
/*
* This is Gr's interface to the host platform's font scaler.
*
* The client is responsible for instantiating this. The instance is created
* for a specific font+size+matrix.
*/
class GrFontScaler : public SkRefCnt {
public:
explicit GrFontScaler(SkGlyphCache* strike);
virtual ~GrFontScaler();
const GrFontDescKey* getKey();
GrMaskFormat getMaskFormat() const;
GrMaskFormat getPackedGlyphMaskFormat(const SkGlyph&) const;
bool getPackedGlyphBounds(const SkGlyph&, SkIRect* bounds);
bool getPackedGlyphImage(const SkGlyph&, int width, int height, int rowBytes,
GrMaskFormat expectedMaskFormat, void* image);
bool getPackedGlyphDFBounds(const SkGlyph&, SkIRect* bounds);
bool getPackedGlyphDFImage(const SkGlyph&, int width, int height, void* image);
const SkPath* getGlyphPath(const SkGlyph&);
const SkGlyph& grToSkGlyph(GrGlyph::PackedID);
private:
SkGlyphCache* fStrike;
GrFontDescKey* fKey;
typedef SkRefCnt INHERITED;
};
#endif
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