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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 SkPath;
/*
* Wrapper class to turn a font cache descriptor into a key
* for GrFontScaler-related lookups
*/
class GrFontDescKey : public SkRefCnt {
public:
SK_DECLARE_INST_COUNT(GrFontDescKey)
typedef uint32_t Hash;
explicit GrFontDescKey(const SkDescriptor& desc);
virtual ~GrFontDescKey();
Hash getHash() const { return fHash; }
bool operator<(const GrFontDescKey& rh) const {
return fHash < rh.fHash || (fHash == rh.fHash && this->lt(rh));
}
bool operator==(const GrFontDescKey& rh) const {
return fHash == rh.fHash && this->eq(rh);
}
private:
// helper functions for comparisons
bool lt(const GrFontDescKey& rh) const;
bool eq(const GrFontDescKey& rh) const;
SkDescriptor* fDesc;
enum {
kMaxStorageInts = 16
};
uint32_t fStorage[kMaxStorageInts];
const Hash 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:
SK_DECLARE_INST_COUNT(GrFontScaler)
explicit GrFontScaler(SkGlyphCache* strike);
virtual ~GrFontScaler();
const GrFontDescKey* getKey();
GrMaskFormat getMaskFormat() const;
GrMaskFormat getPackedGlyphMaskFormat(GrGlyph::PackedID) const;
bool getPackedGlyphBounds(GrGlyph::PackedID, SkIRect* bounds);
bool getPackedGlyphImage(GrGlyph::PackedID, int width, int height,
int rowBytes, void* image);
bool getPackedGlyphDFBounds(GrGlyph::PackedID, SkIRect* bounds);
bool getPackedGlyphDFImage(GrGlyph::PackedID, int width, int height,
void* image);
bool getGlyphPath(uint16_t glyphID, SkPath*);
private:
SkGlyphCache* fStrike;
GrFontDescKey* fKey;
typedef SkRefCnt INHERITED;
};
#endif
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