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| (Empty) |
| 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 #include "GrGLBlend.h" | |
| 8 #include "gl/builders/GrGLFragmentShaderBuilder.h" | |
| 9 | |
| 10 static bool append_porterduff_term(GrGLFragmentBuilder* fsBuilder, SkXfermode::C
oeff coeff, | |
| 11 const char* colorName, const char* srcColorNa
me, | |
| 12 const char* dstColorName, bool hasPrevious) { | |
| 13 if (SkXfermode::kZero_Coeff == coeff) { | |
| 14 return hasPrevious; | |
| 15 } else { | |
| 16 if (hasPrevious) { | |
| 17 fsBuilder->codeAppend(" + "); | |
| 18 } | |
| 19 fsBuilder->codeAppendf("%s", colorName); | |
| 20 switch (coeff) { | |
| 21 case SkXfermode::kOne_Coeff: | |
| 22 break; | |
| 23 case SkXfermode::kSC_Coeff: | |
| 24 fsBuilder->codeAppendf(" * %s", srcColorName); | |
| 25 break; | |
| 26 case SkXfermode::kISC_Coeff: | |
| 27 fsBuilder->codeAppendf(" * (vec4(1.0) - %s)", srcColorName); | |
| 28 break; | |
| 29 case SkXfermode::kDC_Coeff: | |
| 30 fsBuilder->codeAppendf(" * %s", dstColorName); | |
| 31 break; | |
| 32 case SkXfermode::kIDC_Coeff: | |
| 33 fsBuilder->codeAppendf(" * (vec4(1.0) - %s)", dstColorName); | |
| 34 break; | |
| 35 case SkXfermode::kSA_Coeff: | |
| 36 fsBuilder->codeAppendf(" * %s.a", srcColorName); | |
| 37 break; | |
| 38 case SkXfermode::kISA_Coeff: | |
| 39 fsBuilder->codeAppendf(" * (1.0 - %s.a)", srcColorName); | |
| 40 break; | |
| 41 case SkXfermode::kDA_Coeff: | |
| 42 fsBuilder->codeAppendf(" * %s.a", dstColorName); | |
| 43 break; | |
| 44 case SkXfermode::kIDA_Coeff: | |
| 45 fsBuilder->codeAppendf(" * (1.0 - %s.a)", dstColorName); | |
| 46 break; | |
| 47 default: | |
| 48 SkFAIL("Unsupported Blend Coeff"); | |
| 49 } | |
| 50 return true; | |
| 51 } | |
| 52 } | |
| 53 | |
| 54 void GrGLBlend::AppendPorterDuffBlend(GrGLFragmentBuilder* fsBuilder, const char
* srcColor, | |
| 55 const char* dstColor, const char* outColor
, | |
| 56 SkXfermode::Mode mode) { | |
| 57 | |
| 58 SkXfermode::Coeff srcCoeff, dstCoeff; | |
| 59 SkXfermode::ModeAsCoeff(mode, &srcCoeff, &dstCoeff); | |
| 60 | |
| 61 fsBuilder->codeAppendf("%s = ", outColor); | |
| 62 // append src blend | |
| 63 bool didAppend = append_porterduff_term(fsBuilder, srcCoeff, srcColor, srcCo
lor, dstColor, | |
| 64 false); | |
| 65 // append dst blend | |
| 66 if(!append_porterduff_term(fsBuilder, dstCoeff, dstColor, srcColor, dstColor
, didAppend)) { | |
| 67 fsBuilder->codeAppend("vec4(0, 0, 0, 0)"); | |
| 68 } | |
| 69 fsBuilder->codeAppend(";"); | |
| 70 } | |
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Chromium Code Reviews
Issue 1334293003:
Create fragment processor for performing input color blend with child processor (Closed)
Base URL: https://skia.googlesource.com/skia.git@master