src/gpu/GrTextStrike.h - Issue 780923002: Ganesh text rendering cleanup.

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Issue 780923002: Ganesh text rendering cleanup. (Closed) Base URL: https://skia.googlesource.com/skia.git@master

Patch Set: Created 6 years ago

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1

2 /*

3 * Copyright 2010 Google Inc.

4 *

5 * Use of this source code is governed by a BSD-style license that can be

6 * found in the LICENSE file.

7 */

8

9

10

11 #ifndef GrTextStrike_DEFINED

12 #define GrTextStrike_DEFINED

13

14 #include "GrAtlas.h"

15 #include "GrDrawTarget.h"

16 #include "GrFontScaler.h"

17 #include "GrGlyph.h"

18 #include "SkTDynamicHash.h"

19 #include "SkVarAlloc.h"

20

21 class GrFontCache;

22 class GrGpu;

23 class GrFontPurgeListener;

24

25 /**

26 * The textstrike maps a hostfontscaler instance to a dictionary of

27 * glyphid->strike

28 */

29 class GrTextStrike {

30 public:

31 GrTextStrike(GrFontCache, const GrFontDescKey fontScalerKey);

32 ~GrTextStrike();

33

34 const GrFontDescKey* getFontScalerKey() const { return fFontScalerKey; }

35 GrFontCache* getFontCache() const { return fFontCache; }

36

37 inline GrGlyph* getGlyph(GrGlyph::PackedID, GrFontScaler*);

38 // returns true if glyph (or glyph+padding for distance field)

39 // is too large to ever fit in texture atlas subregions (GrPlots)

40 bool glyphTooLargeForAtlas(GrGlyph*);

41 // returns true if glyph successfully added to texture atlas, false otherwis e

42 bool addGlyphToAtlas(GrGlyph, GrFontScaler);

43

44 // testing

45 int countGlyphs() const { return fCache.count(); }

46

47 // remove any references to this plot

48 void removePlot(const GrPlot* plot);

49

50 static const GrFontDescKey& GetKey(const GrTextStrike& ts) {

51 return *(ts.fFontScalerKey);

52 }

53 static uint32_t Hash(const GrFontDescKey& key) {

54 return key.getHash();

55 }

56

57 public:

58 // for easy removal from list

59 GrTextStrike* fPrev;

60 GrTextStrike* fNext;

61

62 private:

63 SkTDynamicHash<GrGlyph, GrGlyph::PackedID> fCache;

64 const GrFontDescKey* fFontScalerKey;

65 SkVarAlloc fPool;

66

67 GrFontCache* fFontCache;

68 bool fUseDistanceField;

69

70 GrAtlas::ClientPlotUsage fPlotUsage;

71

72 GrGlyph* generateGlyph(GrGlyph::PackedID packed, GrFontScaler* scaler);

73

74 friend class GrFontCache;

75 };

76

77 class GrFontCache {

78 public:

79 GrFontCache(GrGpu*);

80 ~GrFontCache();

81

82 inline GrTextStrike* getStrike(GrFontScaler*, bool useDistanceField);

83

84 // add to texture atlas that matches this format

85 GrPlot* addToAtlas(GrMaskFormat format, GrAtlas::ClientPlotUsage* usage,

86 int width, int height, const void* image,

87 SkIPoint16* loc);

88

89 void freeAll();

90

91 // make an unused plot available for this glyph

92 bool freeUnusedPlot(GrTextStrike* preserveStrike, const GrGlyph* glyph);

93

94 // testing

95 int countStrikes() const { return fCache.count(); }

96 GrTextStrike* getHeadStrike() const { return fHead; }

97

98 void updateTextures() {

99 for (int i = 0; i < kAtlasCount; ++i) {

100 if (fAtlases[i]) {

101 fAtlases[i]->uploadPlotsToTexture();

102 }

103 }

104 }

105

106 #ifdef SK_DEBUG

107 void validate() const;

108 #else

109 void validate() const {}

110 #endif

111

112 void dump() const;

113

114 enum AtlasType {

115 kA8_AtlasType, //!< 1-byte per pixel

116 k565_AtlasType, //!< 2-bytes per pixel

117 k8888_AtlasType, //!< 4-bytes per pixel

118

119 kLast_AtlasType = k8888_AtlasType

120 };

121 static const int kAtlasCount = kLast_AtlasType + 1;

122

123 private:

124 friend class GrFontPurgeListener;

125

126 SkTDynamicHash<GrTextStrike, GrFontDescKey> fCache;

127 // for LRU

128 GrTextStrike* fHead;

129 GrTextStrike* fTail;

130

131 GrGpu* fGpu;

132 GrAtlas* fAtlases[kAtlasCount];

133

134 GrTextStrike* generateStrike(GrFontScaler*);

135 inline void detachStrikeFromList(GrTextStrike*);

136 void purgeStrike(GrTextStrike* strike);

137 };

138

139 #endif

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