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1 /* | 1 /* |
2 * Copyright 2013 Google Inc. | 2 * Copyright 2013 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #include "GrDistanceFieldTextContext.h" | 8 #include "GrDistanceFieldTextContext.h" |
9 #include "GrAtlas.h" | 9 #include "GrAtlas.h" |
10 #include "GrBitmapTextContext.h" | 10 #include "GrBitmapTextContext.h" |
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25 #include "SkGlyphCache.h" | 25 #include "SkGlyphCache.h" |
26 #include "SkGpuDevice.h" | 26 #include "SkGpuDevice.h" |
27 #include "SkPath.h" | 27 #include "SkPath.h" |
28 #include "SkRTConf.h" | 28 #include "SkRTConf.h" |
29 #include "SkStrokeRec.h" | 29 #include "SkStrokeRec.h" |
30 #include "effects/GrDistanceFieldTextureEffect.h" | 30 #include "effects/GrDistanceFieldTextureEffect.h" |
31 | 31 |
32 SK_CONF_DECLARE(bool, c_DumpFontCache, "gpu.dumpFontCache", false, | 32 SK_CONF_DECLARE(bool, c_DumpFontCache, "gpu.dumpFontCache", false, |
33 "Dump the contents of the font cache before every purge."); | 33 "Dump the contents of the font cache before every purge."); |
34 | 34 |
35 static const int kSmallDFFontSize = 32; | 35 static const int kMinDFFontSize = 18; |
36 static const int kSmallDFFontLimit = 32; | 36 static const int kSmallDFFontSize = 40; |
37 static const int kMediumDFFontSize = 72; | 37 static const int kSmallDFFontLimit = 40; |
38 static const int kMediumDFFontLimit = 72; | 38 static const int kMediumDFFontSize = 81; |
| 39 static const int kMediumDFFontLimit = 81; |
39 static const int kLargeDFFontSize = 162; | 40 static const int kLargeDFFontSize = 162; |
40 | 41 |
41 static const int kVerticesPerGlyph = 4; | 42 static const int kVerticesPerGlyph = 4; |
42 static const int kIndicesPerGlyph = 6; | 43 static const int kIndicesPerGlyph = 6; |
43 | 44 |
44 GrDistanceFieldTextContext::GrDistanceFieldTextContext(GrContext* context, | 45 GrDistanceFieldTextContext::GrDistanceFieldTextContext(GrContext* context, |
45 const SkDeviceProperties&
properties, | 46 const SkDeviceProperties&
properties, |
46 bool enable) | 47 bool enable) |
47 : GrTextContext(context, pro
perties) { | 48 : GrTextContext(context, pro
perties) { |
48 #if SK_FORCE_DISTANCE_FIELD_TEXT | 49 #if SK_FORCE_DISTANCE_FIELD_TEXT |
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81 } | 82 } |
82 | 83 |
83 bool GrDistanceFieldTextContext::canDraw(const SkPaint& paint, const SkMatrix& v
iewMatrix) { | 84 bool GrDistanceFieldTextContext::canDraw(const SkPaint& paint, const SkMatrix& v
iewMatrix) { |
84 // TODO: support perspective (need getMaxScale replacement) | 85 // TODO: support perspective (need getMaxScale replacement) |
85 if (viewMatrix.hasPerspective()) { | 86 if (viewMatrix.hasPerspective()) { |
86 return false; | 87 return false; |
87 } | 88 } |
88 | 89 |
89 SkScalar maxScale = viewMatrix.getMaxScale(); | 90 SkScalar maxScale = viewMatrix.getMaxScale(); |
90 SkScalar scaledTextSize = maxScale*paint.getTextSize(); | 91 SkScalar scaledTextSize = maxScale*paint.getTextSize(); |
| 92 // Hinted text looks far better at small resolutions |
91 // Scaling up beyond 2x yields undesireable artifacts | 93 // Scaling up beyond 2x yields undesireable artifacts |
92 if (scaledTextSize > 2*kLargeDFFontSize) { | 94 if (scaledTextSize < kMinDFFontSize || scaledTextSize > 2*kLargeDFFontSize)
{ |
93 return false; | 95 return false; |
94 } | 96 } |
95 | 97 |
96 if (!fEnableDFRendering && !paint.isDistanceFieldTextTEMP() && | 98 if (!fEnableDFRendering && !paint.isDistanceFieldTextTEMP() && |
97 scaledTextSize < kLargeDFFontSize) { | 99 scaledTextSize < kLargeDFFontSize) { |
98 return false; | 100 return false; |
99 } | 101 } |
100 | 102 |
101 // rasterizers and mask filters modify alpha, which doesn't | 103 // rasterizers and mask filters modify alpha, which doesn't |
102 // translate well to distance | 104 // translate well to distance |
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135 | 137 |
136 fVertices = NULL; | 138 fVertices = NULL; |
137 fCurrVertex = 0; | 139 fCurrVertex = 0; |
138 fAllocVertexCount = 0; | 140 fAllocVertexCount = 0; |
139 fTotalVertexCount = 0; | 141 fTotalVertexCount = 0; |
140 | 142 |
141 if (scaledTextSize <= kSmallDFFontLimit) { | 143 if (scaledTextSize <= kSmallDFFontLimit) { |
142 fTextRatio = textSize / kSmallDFFontSize; | 144 fTextRatio = textSize / kSmallDFFontSize; |
143 fSkPaint.setTextSize(SkIntToScalar(kSmallDFFontSize)); | 145 fSkPaint.setTextSize(SkIntToScalar(kSmallDFFontSize)); |
144 #if DEBUG_TEXT_SIZE | 146 #if DEBUG_TEXT_SIZE |
145 fSkPaint.setColor(SkColorSetARGB(0xFF, 0x00, 0x00, 0xFF)); | 147 fSkPaint.setColor(SkColorSetARGB(0xFF, 0x00, 0x00, 0x7F)); |
146 fPaint.setColor(GrColorPackRGBA(0x00, 0x00, 0xFF, 0xFF)); | 148 fPaint.setColor(GrColorPackRGBA(0x00, 0x00, 0x7F, 0xFF)); |
147 #endif | 149 #endif |
148 } else if (scaledTextSize <= kMediumDFFontLimit) { | 150 } else if (scaledTextSize <= kMediumDFFontLimit) { |
149 fTextRatio = textSize / kMediumDFFontSize; | 151 fTextRatio = textSize / kMediumDFFontSize; |
150 fSkPaint.setTextSize(SkIntToScalar(kMediumDFFontSize)); | 152 fSkPaint.setTextSize(SkIntToScalar(kMediumDFFontSize)); |
151 #if DEBUG_TEXT_SIZE | 153 #if DEBUG_TEXT_SIZE |
152 fSkPaint.setColor(SkColorSetARGB(0xFF, 0x00, 0xFF, 0x00)); | 154 fSkPaint.setColor(SkColorSetARGB(0xFF, 0x00, 0x3F, 0x00)); |
153 fPaint.setColor(GrColorPackRGBA(0x00, 0xFF, 0x00, 0xFF)); | 155 fPaint.setColor(GrColorPackRGBA(0x00, 0x3F, 0x00, 0xFF)); |
154 #endif | 156 #endif |
155 } else { | 157 } else { |
156 fTextRatio = textSize / kLargeDFFontSize; | 158 fTextRatio = textSize / kLargeDFFontSize; |
157 fSkPaint.setTextSize(SkIntToScalar(kLargeDFFontSize)); | 159 fSkPaint.setTextSize(SkIntToScalar(kLargeDFFontSize)); |
158 #if DEBUG_TEXT_SIZE | 160 #if DEBUG_TEXT_SIZE |
159 fSkPaint.setColor(SkColorSetARGB(0xFF, 0xFF, 0x00, 0x00)); | 161 fSkPaint.setColor(SkColorSetARGB(0xFF, 0x7F, 0x00, 0x00)); |
160 fPaint.setColor(GrColorPackRGBA(0xFF, 0x00, 0x00, 0xFF)); | 162 fPaint.setColor(GrColorPackRGBA(0x7F, 0x00, 0x00, 0xFF)); |
161 #endif | 163 #endif |
162 } | 164 } |
163 | 165 |
164 fUseLCDText = fSkPaint.isLCDRenderText(); | 166 fUseLCDText = fSkPaint.isLCDRenderText(); |
165 | 167 |
166 fSkPaint.setLCDRenderText(false); | 168 fSkPaint.setLCDRenderText(false); |
167 fSkPaint.setAutohinted(false); | 169 fSkPaint.setAutohinted(false); |
168 fSkPaint.setHinting(SkPaint::kNormal_Hinting); | 170 fSkPaint.setHinting(SkPaint::kNormal_Hinting); |
169 fSkPaint.setSubpixelText(true); | 171 fSkPaint.setSubpixelText(true); |
170 } | 172 } |
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720 } | 722 } |
721 } | 723 } |
722 | 724 |
723 inline void GrDistanceFieldTextContext::finish() { | 725 inline void GrDistanceFieldTextContext::finish() { |
724 this->flush(); | 726 this->flush(); |
725 fTotalVertexCount = 0; | 727 fTotalVertexCount = 0; |
726 | 728 |
727 GrTextContext::finish(); | 729 GrTextContext::finish(); |
728 } | 730 } |
729 | 731 |
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