1 /* 2 * Copyright 2012 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 #include "GrConfigConversionEffect.h" 9 #include "GrContext.h" 10 #include "GrTBackendEffectFactory.h" 11 #include "GrSimpleTextureEffect.h" 12 #include "gl/GrGLEffect.h" 13 #include "gl/GrGLEffectMatrix.h" 14 #include "SkMatrix.h" 15 16 class GrGLConfigConversionEffect : public GrGLEffect { 17 public: 18 GrGLConfigConversionEffect(const GrBackendEffectFactory& factory, 19 const GrDrawEffect& drawEffect) 20 : INHERITED (factory) 21 , fEffectMatrix(drawEffect.castEffect<GrConfigConversionEffect>().coordsType()) { 22 const GrConfigConversionEffect& effect = drawEffect.castEffect<GrConfigConversionEffect>(); 23 fSwapRedAndBlue = effect.swapsRedAndBlue(); 24 fPMConversion = effect.pmConversion(); 25 } 26 27 virtual void emitCode(GrGLShaderBuilder* builder, 28 const GrDrawEffect&, 29 EffectKey key, 30 const char* outputColor, 31 const char* inputColor, 32 const TextureSamplerArray& samplers) SK_OVERRIDE { 33 const char* coords; 34 GrSLType coordsType = fEffectMatrix.emitCode(builder, key, &coords); 35 builder->fsCodeAppendf("\t\t%s = ", outputColor); 36 builder->appendTextureLookup(GrGLShaderBuilder::kFragment_ShaderType, 37 samplers[0], 38 coords, 39 coordsType); 40 builder->fsCodeAppend(";\n"); 41 if (GrConfigConversionEffect::kNone_PMConversion == fPMConversion) { 42 GrAssert(fSwapRedAndBlue); 43 builder->fsCodeAppendf("\t%s = %s.bgra;\n", outputColor, outputColor); 44 } else { 45 const char* swiz = fSwapRedAndBlue ? "bgr" : "rgb"; 46 switch (fPMConversion) { 47 case GrConfigConversionEffect::kMulByAlpha_RoundUp_PMConversion: 48 builder->fsCodeAppendf( 49 "\t\t%s = vec4(ceil(%s.%s * %s.a * 255.0) / 255.0, %s.a);\n", 50 outputColor, outputColor, swiz, outputColor, outputColor); 51 break; 52 case GrConfigConversionEffect::kMulByAlpha_RoundDown_PMConversion: 53 // Add a compensation(0.001) here to avoid the side effect of the floor operation. 54 // In Intel GPUs, the integer value converted from floor(%s.r * 255.0) / 255.0 55 // is less than the integer value converted from %s.r by 1 when the %s.r is 56 // converted from the integer value 2^n, such as 1, 2, 4, 8, etc. 57 builder->fsCodeAppendf( 58 "\t\t%s = vec4(floor(%s.%s * %s.a * 255.0 + 0.001) / 255.0, %s.a);\n", 59 outputColor, outputColor, swiz, outputColor, outputColor); 60 break; 61 case GrConfigConversionEffect::kDivByAlpha_RoundUp_PMConversion: 62 builder->fsCodeAppendf("\t\t%s = %s.a <= 0.0 ? vec4(0,0,0,0) : vec4(ceil(%s.%s / %s.a * 255.0) / 255.0, %s.a);\n", 63 outputColor, outputColor, outputColor, swiz, outputColor, outputColor); 64 break; 65 case GrConfigConversionEffect::kDivByAlpha_RoundDown_PMConversion: 66 builder->fsCodeAppendf("\t\t%s = %s.a <= 0.0 ? vec4(0,0,0,0) : vec4(floor(%s.%s / %s.a * 255.0) / 255.0, %s.a);\n", 67 outputColor, outputColor, outputColor, swiz, outputColor, outputColor); 68 break; 69 default: 70 GrCrash("Unknown conversion op."); 71 break; 72 } 73 } 74 SkString modulate; 75 GrGLSLMulVarBy4f(&modulate, 2, outputColor, inputColor); 76 builder->fsCodeAppend(modulate.c_str()); 77 } 78 79 void setData(const GrGLUniformManager& uman, const GrDrawEffect& drawEffect) { 80 const GrConfigConversionEffect& conv = drawEffect.castEffect<GrConfigConversionEffect>(); 81 fEffectMatrix.setData(uman, conv.getMatrix(), drawEffect, conv.texture(0)); 82 } 83 84 static inline EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) { 85 const GrConfigConversionEffect& conv = drawEffect.castEffect<GrConfigConversionEffect>(); 86 EffectKey key = static_cast<EffectKey>(conv.swapsRedAndBlue()) | (conv.pmConversion() << 1); 87 key <<= GrGLEffectMatrix::kKeyBits; 88 EffectKey matrixKey = GrGLEffectMatrix::GenKey(conv.getMatrix(), 89 drawEffect, 90 conv.coordsType(), 91 conv.texture(0)); 92 GrAssert(!(matrixKey & key)); 93 return matrixKey | key; 94 } 95 96 private: 97 bool fSwapRedAndBlue; 98 GrConfigConversionEffect::PMConversion fPMConversion; 99 GrGLEffectMatrix fEffectMatrix; 100 101 typedef GrGLEffect INHERITED; 102 103 }; 104 105 /////////////////////////////////////////////////////////////////////////////// 106 107 GrConfigConversionEffect::GrConfigConversionEffect(GrTexture* texture, 108 bool swapRedAndBlue, 109 PMConversion pmConversion, 110 const SkMatrix& matrix) 111 : GrSingleTextureEffect(texture, matrix) 112 , fSwapRedAndBlue(swapRedAndBlue) 113 , fPMConversion(pmConversion) { 114 GrAssert(kRGBA_8888_GrPixelConfig == texture->config() || 115 kBGRA_8888_GrPixelConfig == texture->config()); 116 // Why did we pollute our texture cache instead of using a GrSingleTextureEffect? 117 GrAssert(swapRedAndBlue || kNone_PMConversion != pmConversion); 118 } 119 120 const GrBackendEffectFactory& GrConfigConversionEffect::getFactory() const { 121 return GrTBackendEffectFactory<GrConfigConversionEffect>::getInstance(); 122 } 123 124 bool GrConfigConversionEffect::onIsEqual(const GrEffect& s) const { 125 const GrConfigConversionEffect& other = CastEffect<GrConfigConversionEffect>(s); 126 return this->texture(0) == s.texture(0) && 127 other.fSwapRedAndBlue == fSwapRedAndBlue && 128 other.fPMConversion == fPMConversion; 129 } 130 131 void GrConfigConversionEffect::getConstantColorComponents(GrColor* color, 132 uint32_t* validFlags) const { 133 this->updateConstantColorComponentsForModulation(color, validFlags); 134 } 135 136 /////////////////////////////////////////////////////////////////////////////// 137 138 GR_DEFINE_EFFECT_TEST(GrConfigConversionEffect); 139 140 GrEffectRef* GrConfigConversionEffect::TestCreate(SkMWCRandom* random, 141 GrContext*, 142 const GrDrawTargetCaps&, 143 GrTexture* textures[]) { 144 PMConversion pmConv = static_cast<PMConversion>(random->nextULessThan(kPMConversionCnt)); 145 bool swapRB; 146 if (kNone_PMConversion == pmConv) { 147 swapRB = true; 148 } else { 149 swapRB = random->nextBool(); 150 } 151 AutoEffectUnref effect(SkNEW_ARGS(GrConfigConversionEffect, 152 (textures[GrEffectUnitTest::kSkiaPMTextureIdx], 153 swapRB, 154 pmConv, 155 GrEffectUnitTest::TestMatrix(random)))); 156 return CreateEffectRef(effect); 157 } 158 159 /////////////////////////////////////////////////////////////////////////////// 160 void GrConfigConversionEffect::TestForPreservingPMConversions(GrContext* context, 161 PMConversion* pmToUPMRule, 162 PMConversion* upmToPMRule) { 163 *pmToUPMRule = kNone_PMConversion; 164 *upmToPMRule = kNone_PMConversion; 165 SkAutoTMalloc<uint32_t> data(256 * 256 * 3); 166 uint32_t* srcData = data.get(); 167 uint32_t* firstRead = data.get() + 256 * 256; 168 uint32_t* secondRead = data.get() + 2 * 256 * 256; 169 170 // Fill with every possible premultiplied A, color channel value. There will be 256-y duplicate 171 // values in row y. We set r,g, and b to the same value since they are handled identically. 172 for (int y = 0; y < 256; ++y) { 173 for (int x = 0; x < 256; ++x) { 174 uint8_t* color = reinterpret_cast<uint8_t*>(&srcData[256*y + x]); 175 color[3] = y; 176 color[2] = GrMin(x, y); 177 color[1] = GrMin(x, y); 178 color[0] = GrMin(x, y); 179 } 180 } 181 182 GrTextureDesc desc; 183 desc.fFlags = kRenderTarget_GrTextureFlagBit | 184 kNoStencil_GrTextureFlagBit; 185 desc.fWidth = 256; 186 desc.fHeight = 256; 187 desc.fConfig = kRGBA_8888_GrPixelConfig; 188 189 SkAutoTUnref<GrTexture> readTex(context->createUncachedTexture(desc, NULL, 0)); 190 if (!readTex.get()) { 191 return; 192 } 193 SkAutoTUnref<GrTexture> tempTex(context->createUncachedTexture(desc, NULL, 0)); 194 if (!tempTex.get()) { 195 return; 196 } 197 desc.fFlags = kNone_GrTextureFlags; 198 SkAutoTUnref<GrTexture> dataTex(context->createUncachedTexture(desc, data, 0)); 199 if (!dataTex.get()) { 200 return; 201 } 202 203 static const PMConversion kConversionRules[][2] = { 204 {kDivByAlpha_RoundDown_PMConversion, kMulByAlpha_RoundUp_PMConversion}, 205 {kDivByAlpha_RoundUp_PMConversion, kMulByAlpha_RoundDown_PMConversion}, 206 }; 207 208 GrContext::AutoWideOpenIdentityDraw awoid(context, NULL); 209 210 bool failed = true; 211 212 for (size_t i = 0; i < GR_ARRAY_COUNT(kConversionRules) && failed; ++i) { 213 *pmToUPMRule = kConversionRules[i][0]; 214 *upmToPMRule = kConversionRules[i][1]; 215 216 static const SkRect kDstRect = SkRect::MakeWH(SkIntToScalar(256), SkIntToScalar(256)); 217 static const SkRect kSrcRect = SkRect::MakeWH(SK_Scalar1, SK_Scalar1); 218 // We do a PM->UPM draw from dataTex to readTex and read the data. Then we do a UPM->PM draw 219 // from readTex to tempTex followed by a PM->UPM draw to readTex and finally read the data. 220 // We then verify that two reads produced the same values. 221 222 AutoEffectUnref pmToUPM1(SkNEW_ARGS(GrConfigConversionEffect, (dataTex, 223 false, 224 *pmToUPMRule, 225 SkMatrix::I()))); 226 AutoEffectUnref upmToPM(SkNEW_ARGS(GrConfigConversionEffect, (readTex, 227 false, 228 *upmToPMRule, 229 SkMatrix::I()))); 230 AutoEffectUnref pmToUPM2(SkNEW_ARGS(GrConfigConversionEffect, (tempTex, 231 false, 232 *pmToUPMRule, 233 SkMatrix::I()))); 234 235 SkAutoTUnref<GrEffectRef> pmToUPMEffect1(CreateEffectRef(pmToUPM1)); 236 SkAutoTUnref<GrEffectRef> upmToPMEffect(CreateEffectRef(upmToPM)); 237 SkAutoTUnref<GrEffectRef> pmToUPMEffect2(CreateEffectRef(pmToUPM2)); 238 239 context->setRenderTarget(readTex->asRenderTarget()); 240 GrPaint paint1; 241 paint1.addColorEffect(pmToUPMEffect1); 242 context->drawRectToRect(paint1, kDstRect, kSrcRect); 243 244 readTex->readPixels(0, 0, 256, 256, kRGBA_8888_GrPixelConfig, firstRead); 245 246 context->setRenderTarget(tempTex->asRenderTarget()); 247 GrPaint paint2; 248 paint2.addColorEffect(upmToPMEffect); 249 context->drawRectToRect(paint2, kDstRect, kSrcRect); 250 context->setRenderTarget(readTex->asRenderTarget()); 251 252 GrPaint paint3; 253 paint3.addColorEffect(pmToUPMEffect2); 254 context->drawRectToRect(paint3, kDstRect, kSrcRect); 255 256 readTex->readPixels(0, 0, 256, 256, kRGBA_8888_GrPixelConfig, secondRead); 257 258 failed = false; 259 for (int y = 0; y < 256 && !failed; ++y) { 260 for (int x = 0; x <= y; ++x) { 261 if (firstRead[256 * y + x] != secondRead[256 * y + x]) { 262 failed = true; 263 break; 264 } 265 } 266 } 267 } 268 if (failed) { 269 *pmToUPMRule = kNone_PMConversion; 270 *upmToPMRule = kNone_PMConversion; 271 } 272 } 273 274 const GrEffectRef* GrConfigConversionEffect::Create(GrTexture* texture, 275 bool swapRedAndBlue, 276 PMConversion pmConversion, 277 const SkMatrix& matrix) { 278 if (!swapRedAndBlue && kNone_PMConversion == pmConversion) { 279 // If we returned a GrConfigConversionEffect that was equivalent to a GrSimpleTextureEffect 280 // then we may pollute our texture cache with redundant shaders. So in the case that no 281 // conversions were requested we instead return a GrSimpleTextureEffect. 282 return GrSimpleTextureEffect::Create(texture, matrix); 283 } else { 284 if (kRGBA_8888_GrPixelConfig != texture->config() && 285 kBGRA_8888_GrPixelConfig != texture->config() && 286 kNone_PMConversion != pmConversion) { 287 // The PM conversions assume colors are 0..255 288 return NULL; 289 } 290 AutoEffectUnref effect(SkNEW_ARGS(GrConfigConversionEffect, (texture, 291 swapRedAndBlue, 292 pmConversion, 293 matrix))); 294 return CreateEffectRef(effect); 295 } 296 } 297
