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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 "GrDrawTarget.h" | 10 #include "GrDrawTarget.h" |
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48 | 48 |
49 fVertices = NULL; | 49 fVertices = NULL; |
50 fMaxVertices = 0; | 50 fMaxVertices = 0; |
51 } | 51 } |
52 | 52 |
53 GrDistanceFieldTextContext::~GrDistanceFieldTextContext() { | 53 GrDistanceFieldTextContext::~GrDistanceFieldTextContext() { |
54 this->flushGlyphs(); | 54 this->flushGlyphs(); |
55 } | 55 } |
56 | 56 |
57 bool GrDistanceFieldTextContext::canDraw(const SkPaint& paint) { | 57 bool GrDistanceFieldTextContext::canDraw(const SkPaint& paint) { |
58 return (kForceDistanceFieldFonts || paint.isDistanceFieldTextTEMP()) && | 58 if (!kForceDistanceFieldFonts && !paint.isDistanceFieldTextTEMP()) { |
59 !paint.getRasterizer() && !paint.getMaskFilter() && | 59 return false; |
60 paint.getStyle() == SkPaint::kFill_Style && | 60 } |
61 fContext->getTextTarget()->caps()->shaderDerivativeSupport() && | 61 |
62 !SkDraw::ShouldDrawTextAsPaths(paint, fContext->getMatrix()); | 62 // rasterizers and mask filters modify alpha, which doesn't |
| 63 // translate well to distance |
| 64 if (paint.getRasterizer() || paint.getMaskFilter() || |
| 65 !fContext->getTextTarget()->caps()->shaderDerivativeSupport()) { |
| 66 return false; |
| 67 } |
| 68 |
| 69 // TODO: add some stroking support |
| 70 if (paint.getStyle() != SkPaint::kFill_Style) { |
| 71 return false; |
| 72 } |
| 73 |
| 74 // TODO: choose an appropriate maximum scale for distance fields and |
| 75 // enable perspective |
| 76 if (SkDraw::ShouldDrawTextAsPaths(paint, fContext->getMatrix())) { |
| 77 return false; |
| 78 } |
| 79 |
| 80 // distance fields cannot represent color fonts |
| 81 SkScalerContext::Rec rec; |
| 82 SkScalerContext::MakeRec(paint, &fDeviceProperties, NULL, &rec); |
| 83 return rec.getFormat() != SkMask::kARGB32_Format; |
63 } | 84 } |
64 | 85 |
65 static inline GrColor skcolor_to_grcolor_nopremultiply(SkColor c) { | 86 static inline GrColor skcolor_to_grcolor_nopremultiply(SkColor c) { |
66 unsigned r = SkColorGetR(c); | 87 unsigned r = SkColorGetR(c); |
67 unsigned g = SkColorGetG(c); | 88 unsigned g = SkColorGetG(c); |
68 unsigned b = SkColorGetB(c); | 89 unsigned b = SkColorGetB(c); |
69 return GrColorPackRGBA(r, g, b, 0xff); | 90 return GrColorPackRGBA(r, g, b, 0xff); |
70 } | 91 } |
71 | 92 |
72 void GrDistanceFieldTextContext::flushGlyphs() { | 93 void GrDistanceFieldTextContext::flushGlyphs() { |
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472 SkScalarToFixed(y) - (glyph.fAdvanceY >> a
lignShift) | 493 SkScalarToFixed(y) - (glyph.fAdvanceY >> a
lignShift) |
473 + SK_FixedHalf, //d1g.fHalfSampleY, | 494 + SK_FixedHalf, //d1g.fHalfSampleY, |
474 fontScaler); | 495 fontScaler); |
475 } | 496 } |
476 pos += scalarsPerPosition; | 497 pos += scalarsPerPosition; |
477 } | 498 } |
478 } | 499 } |
479 | 500 |
480 this->finish(); | 501 this->finish(); |
481 } | 502 } |
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