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1 /* | |
2 * Copyright 2010 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 GrFontScaler_DEFINED | |
9 #define GrFontScaler_DEFINED | |
10 | |
11 #include "GrGlyph.h" | |
12 #include "GrTypes.h" | |
13 | |
14 #include "SkDescriptor.h" | |
15 | |
16 class SkPath; | |
17 | |
18 /* | |
19 * Wrapper class to turn a font cache descriptor into a key | |
20 * for GrFontScaler-related lookups | |
21 */ | |
22 class GrFontDescKey : public SkRefCnt { | |
23 public: | |
24 SK_DECLARE_INST_COUNT(GrFontDescKey) | |
25 | |
26 typedef uint32_t Hash; | |
27 | |
28 explicit GrFontDescKey(const SkDescriptor& desc); | |
29 virtual ~GrFontDescKey(); | |
30 | |
31 Hash getHash() const { return fHash; } | |
32 | |
33 bool operator<(const GrFontDescKey& rh) const { | |
34 return fHash < rh.fHash || (fHash == rh.fHash && this->lt(rh)); | |
35 } | |
36 bool operator==(const GrFontDescKey& rh) const { | |
37 return fHash == rh.fHash && this->eq(rh); | |
38 } | |
39 | |
40 private: | |
41 // helper functions for comparisons | |
42 bool lt(const GrFontDescKey& rh) const; | |
43 bool eq(const GrFontDescKey& rh) const; | |
44 | |
45 SkDescriptor* fDesc; | |
46 enum { | |
47 kMaxStorageInts = 16 | |
48 }; | |
49 uint32_t fStorage[kMaxStorageInts]; | |
50 const Hash fHash; | |
51 | |
52 typedef SkRefCnt INHERITED; | |
53 }; | |
54 | |
55 /* | |
56 * This is Gr's interface to the host platform's font scaler. | |
57 * | |
58 * The client is responsible for instantiating this. The instance is created | |
59 * for a specific font+size+matrix. | |
60 */ | |
61 class GrFontScaler : public SkRefCnt { | |
62 public: | |
63 SK_DECLARE_INST_COUNT(GrFontScaler) | |
64 | |
65 explicit GrFontScaler(SkGlyphCache* strike); | |
66 virtual ~GrFontScaler(); | |
67 | |
68 const GrFontDescKey* getKey(); | |
69 GrMaskFormat getMaskFormat() const; | |
70 GrMaskFormat getPackedGlyphMaskFormat(GrGlyph::PackedID) const; | |
71 bool getPackedGlyphBounds(GrGlyph::PackedID, SkIRect* bounds); | |
72 bool getPackedGlyphImage(GrGlyph::PackedID, int width, int height, | |
73 int rowBytes, void* image); | |
74 bool getPackedGlyphDFBounds(GrGlyph::PackedID, SkIRect* bounds); | |
75 bool getPackedGlyphDFImage(GrGlyph::PackedID, int width, int height, | |
76 void* image); | |
77 bool getGlyphPath(uint16_t glyphID, SkPath*); | |
78 | |
79 private: | |
80 SkGlyphCache* fStrike; | |
81 GrFontDescKey* fKey; | |
82 | |
83 typedef SkRefCnt INHERITED; | |
84 }; | |
85 | |
86 #endif | |
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