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1 /* | |
2 * Copyright 2015 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 GrBatchFontCache_DEFINED | |
9 #define GrBatchFontCache_DEFINED | |
10 | |
11 #include "GrBatchAtlas.h" | |
12 #include "GrDrawTarget.h" | |
13 #include "GrFontScaler.h" | |
14 #include "GrGlyph.h" | |
15 #include "SkTDynamicHash.h" | |
16 #include "SkVarAlloc.h" | |
17 | |
18 class GrBatchFontCache; | |
19 class GrBatchTarget; | |
20 class GrGpu; | |
21 | |
22 /** | |
23 * The GrBatchTextStrike manages a pool of CPU backing memory for Glyph Masks.
This backing memory | |
24 * is abstracted by GrGlyph, and indexed by a PackedID and GrFontScaler. The G
rFontScaler is what | |
25 * actually creates the mask. | |
26 */ | |
27 class GrBatchTextStrike { | |
28 public: | |
29 GrBatchTextStrike(GrBatchFontCache*, const GrFontDescKey* fontScalerKey); | |
30 ~GrBatchTextStrike(); | |
31 | |
32 const GrFontDescKey* getFontScalerKey() const { return fFontScalerKey; } | |
33 GrBatchFontCache* getBatchFontCache() const { return fBatchFontCache; } | |
34 | |
35 inline GrGlyph* getGlyph(GrGlyph::PackedID packed, GrFontScaler* scaler) { | |
36 GrGlyph* glyph = fCache.find(packed); | |
37 if (NULL == glyph) { | |
38 glyph = this->generateGlyph(packed, scaler); | |
39 } | |
40 return glyph; | |
41 } | |
42 | |
43 // returns true if glyph (or glyph+padding for distance field) | |
44 // is too large to ever fit in texture atlas subregions (GrPlots) | |
45 bool glyphTooLargeForAtlas(GrGlyph*); | |
46 // returns true if glyph successfully added to texture atlas, false otherwis
e | |
47 bool addGlyphToAtlas(GrBatchTarget*, GrGlyph*, GrFontScaler*); | |
48 | |
49 // testing | |
50 int countGlyphs() const { return fCache.count(); } | |
51 | |
52 // remove any references to this plot | |
53 void removeID(GrBatchAtlas::AtlasID); | |
54 | |
55 static const GrFontDescKey& GetKey(const GrBatchTextStrike& ts) { | |
56 return *(ts.fFontScalerKey); | |
57 } | |
58 static uint32_t Hash(const GrFontDescKey& key) { | |
59 return key.getHash(); | |
60 } | |
61 | |
62 private: | |
63 SkTDynamicHash<GrGlyph, GrGlyph::PackedID> fCache; | |
64 SkAutoTUnref<const GrFontDescKey> fFontScalerKey; | |
65 SkVarAlloc fPool; | |
66 | |
67 GrBatchFontCache* fBatchFontCache; | |
68 int fAtlasedGlyphs; | |
69 | |
70 GrGlyph* generateGlyph(GrGlyph::PackedID packed, GrFontScaler* scaler); | |
71 | |
72 friend class GrBatchFontCache; | |
73 }; | |
74 | |
75 /* | |
76 * GrBatchFontCache manages strikes which are indexed by a GrFontScaler. These
strikes can then be | |
77 * used to individual Glyph Masks. The GrBatchFontCache also manages GrBatchAtl
ases, though this is | |
78 * more or less transparent to the client(aside from atlasGeneration, described
below) | |
79 */ | |
80 class GrBatchFontCache { | |
81 public: | |
82 GrBatchFontCache(); | |
83 ~GrBatchFontCache(); | |
84 | |
85 // Initializes the GrBatchFontCache on the owning GrContext | |
86 void init(GrContext*); | |
87 | |
88 inline GrBatchTextStrike* getStrike(GrFontScaler* scaler) { | |
89 | |
90 GrBatchTextStrike* strike = fCache.find(*(scaler->getKey())); | |
91 if (NULL == strike) { | |
92 strike = this->generateStrike(scaler); | |
93 } | |
94 return strike; | |
95 } | |
96 | |
97 bool hasGlyph(GrGlyph* glyph); | |
98 | |
99 // To ensure the GrBatchAtlas does not evict the Glyph Mask from its texture
backing store, | |
100 // the client must pass in the currentToken from the GrBatchTarget along wit
h the GrGlyph | |
101 void setGlyphRefToken(GrGlyph*, GrBatchAtlas::BatchToken); | |
102 | |
103 // add to texture atlas that matches this format | |
104 bool addToAtlas(GrBatchTextStrike*, GrBatchAtlas::AtlasID*, GrBatchTarget*, | |
105 GrMaskFormat, int width, int height, const void* image, | |
106 SkIPoint16* loc); | |
107 | |
108 // Some clients may wish to verify the integrity of the texture backing stor
e of the | |
109 // GrBatchAtlas. The atlasGeneration returned below is a monitonically incr
easing number which | |
110 // changes everytime something is removed from the texture backing store. | |
111 uint64_t atlasGeneration(GrMaskFormat) const; | |
112 | |
113 void freeAll(); | |
114 | |
115 GrTexture* getTexture(GrMaskFormat); | |
116 GrPixelConfig getPixelConfig(GrMaskFormat) const; | |
117 | |
118 void dump() const; | |
119 | |
120 private: | |
121 // There is a 1:1 mapping between GrMaskFormats and atlas indices | |
122 static int MaskFormatToAtlasIndex(GrMaskFormat); | |
123 static GrMaskFormat AtlasIndexToMaskFormat(int atlasIndex); | |
124 | |
125 GrBatchTextStrike* generateStrike(GrFontScaler*); | |
126 | |
127 inline GrBatchAtlas* getAtlas(GrMaskFormat) const; | |
128 | |
129 static void HandleEviction(GrBatchAtlas::AtlasID, void*); | |
130 | |
131 SkTDynamicHash<GrBatchTextStrike, GrFontDescKey> fCache; | |
132 | |
133 GrBatchAtlas* fAtlases[kMaskFormatCount]; | |
134 GrBatchTextStrike* fPreserveStrike; | |
135 }; | |
136 | |
137 #endif | |
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