1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/gpu/effects/GrConfigConversionEffect.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,277 @@
1.4 +/*
1.5 + * Copyright 2012 Google Inc.
1.6 + *
1.7 + * Use of this source code is governed by a BSD-style license that can be
1.8 + * found in the LICENSE file.
1.9 + */
1.10 +
1.11 +#include "GrConfigConversionEffect.h"
1.12 +#include "GrContext.h"
1.13 +#include "GrTBackendEffectFactory.h"
1.14 +#include "GrSimpleTextureEffect.h"
1.15 +#include "gl/GrGLEffect.h"
1.16 +#include "SkMatrix.h"
1.17 +
1.18 +class GrGLConfigConversionEffect : public GrGLEffect {
1.19 +public:
1.20 + GrGLConfigConversionEffect(const GrBackendEffectFactory& factory,
1.21 + const GrDrawEffect& drawEffect)
1.22 + : INHERITED (factory) {
1.23 + const GrConfigConversionEffect& effect = drawEffect.castEffect<GrConfigConversionEffect>();
1.24 + fSwapRedAndBlue = effect.swapsRedAndBlue();
1.25 + fPMConversion = effect.pmConversion();
1.26 + }
1.27 +
1.28 + virtual void emitCode(GrGLShaderBuilder* builder,
1.29 + const GrDrawEffect&,
1.30 + EffectKey key,
1.31 + const char* outputColor,
1.32 + const char* inputColor,
1.33 + const TransformedCoordsArray& coords,
1.34 + const TextureSamplerArray& samplers) SK_OVERRIDE {
1.35 + builder->fsCodeAppendf("\t\t%s = ", outputColor);
1.36 + builder->fsAppendTextureLookup(samplers[0], coords[0].c_str(), coords[0].type());
1.37 + builder->fsCodeAppend(";\n");
1.38 + if (GrConfigConversionEffect::kNone_PMConversion == fPMConversion) {
1.39 + SkASSERT(fSwapRedAndBlue);
1.40 + builder->fsCodeAppendf("\t%s = %s.bgra;\n", outputColor, outputColor);
1.41 + } else {
1.42 + const char* swiz = fSwapRedAndBlue ? "bgr" : "rgb";
1.43 + switch (fPMConversion) {
1.44 + case GrConfigConversionEffect::kMulByAlpha_RoundUp_PMConversion:
1.45 + builder->fsCodeAppendf(
1.46 + "\t\t%s = vec4(ceil(%s.%s * %s.a * 255.0) / 255.0, %s.a);\n",
1.47 + outputColor, outputColor, swiz, outputColor, outputColor);
1.48 + break;
1.49 + case GrConfigConversionEffect::kMulByAlpha_RoundDown_PMConversion:
1.50 + // Add a compensation(0.001) here to avoid the side effect of the floor operation.
1.51 + // In Intel GPUs, the integer value converted from floor(%s.r * 255.0) / 255.0
1.52 + // is less than the integer value converted from %s.r by 1 when the %s.r is
1.53 + // converted from the integer value 2^n, such as 1, 2, 4, 8, etc.
1.54 + builder->fsCodeAppendf(
1.55 + "\t\t%s = vec4(floor(%s.%s * %s.a * 255.0 + 0.001) / 255.0, %s.a);\n",
1.56 + outputColor, outputColor, swiz, outputColor, outputColor);
1.57 + break;
1.58 + case GrConfigConversionEffect::kDivByAlpha_RoundUp_PMConversion:
1.59 + 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",
1.60 + outputColor, outputColor, outputColor, swiz, outputColor, outputColor);
1.61 + break;
1.62 + case GrConfigConversionEffect::kDivByAlpha_RoundDown_PMConversion:
1.63 + 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",
1.64 + outputColor, outputColor, outputColor, swiz, outputColor, outputColor);
1.65 + break;
1.66 + default:
1.67 + GrCrash("Unknown conversion op.");
1.68 + break;
1.69 + }
1.70 + }
1.71 + SkString modulate;
1.72 + GrGLSLMulVarBy4f(&modulate, 2, outputColor, inputColor);
1.73 + builder->fsCodeAppend(modulate.c_str());
1.74 + }
1.75 +
1.76 + static inline EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {
1.77 + const GrConfigConversionEffect& conv = drawEffect.castEffect<GrConfigConversionEffect>();
1.78 + return static_cast<EffectKey>(conv.swapsRedAndBlue()) | (conv.pmConversion() << 1);
1.79 + }
1.80 +
1.81 +private:
1.82 + bool fSwapRedAndBlue;
1.83 + GrConfigConversionEffect::PMConversion fPMConversion;
1.84 +
1.85 + typedef GrGLEffect INHERITED;
1.86 +
1.87 +};
1.88 +
1.89 +///////////////////////////////////////////////////////////////////////////////
1.90 +
1.91 +GrConfigConversionEffect::GrConfigConversionEffect(GrTexture* texture,
1.92 + bool swapRedAndBlue,
1.93 + PMConversion pmConversion,
1.94 + const SkMatrix& matrix)
1.95 + : GrSingleTextureEffect(texture, matrix)
1.96 + , fSwapRedAndBlue(swapRedAndBlue)
1.97 + , fPMConversion(pmConversion) {
1.98 + SkASSERT(kRGBA_8888_GrPixelConfig == texture->config() ||
1.99 + kBGRA_8888_GrPixelConfig == texture->config());
1.100 + // Why did we pollute our texture cache instead of using a GrSingleTextureEffect?
1.101 + SkASSERT(swapRedAndBlue || kNone_PMConversion != pmConversion);
1.102 +}
1.103 +
1.104 +const GrBackendEffectFactory& GrConfigConversionEffect::getFactory() const {
1.105 + return GrTBackendEffectFactory<GrConfigConversionEffect>::getInstance();
1.106 +}
1.107 +
1.108 +bool GrConfigConversionEffect::onIsEqual(const GrEffect& s) const {
1.109 + const GrConfigConversionEffect& other = CastEffect<GrConfigConversionEffect>(s);
1.110 + return this->texture(0) == s.texture(0) &&
1.111 + other.fSwapRedAndBlue == fSwapRedAndBlue &&
1.112 + other.fPMConversion == fPMConversion;
1.113 +}
1.114 +
1.115 +void GrConfigConversionEffect::getConstantColorComponents(GrColor* color,
1.116 + uint32_t* validFlags) const {
1.117 + this->updateConstantColorComponentsForModulation(color, validFlags);
1.118 +}
1.119 +
1.120 +///////////////////////////////////////////////////////////////////////////////
1.121 +
1.122 +GR_DEFINE_EFFECT_TEST(GrConfigConversionEffect);
1.123 +
1.124 +GrEffectRef* GrConfigConversionEffect::TestCreate(SkRandom* random,
1.125 + GrContext*,
1.126 + const GrDrawTargetCaps&,
1.127 + GrTexture* textures[]) {
1.128 + PMConversion pmConv = static_cast<PMConversion>(random->nextULessThan(kPMConversionCnt));
1.129 + bool swapRB;
1.130 + if (kNone_PMConversion == pmConv) {
1.131 + swapRB = true;
1.132 + } else {
1.133 + swapRB = random->nextBool();
1.134 + }
1.135 + AutoEffectUnref effect(SkNEW_ARGS(GrConfigConversionEffect,
1.136 + (textures[GrEffectUnitTest::kSkiaPMTextureIdx],
1.137 + swapRB,
1.138 + pmConv,
1.139 + GrEffectUnitTest::TestMatrix(random))));
1.140 + return CreateEffectRef(effect);
1.141 +}
1.142 +
1.143 +///////////////////////////////////////////////////////////////////////////////
1.144 +void GrConfigConversionEffect::TestForPreservingPMConversions(GrContext* context,
1.145 + PMConversion* pmToUPMRule,
1.146 + PMConversion* upmToPMRule) {
1.147 + *pmToUPMRule = kNone_PMConversion;
1.148 + *upmToPMRule = kNone_PMConversion;
1.149 + SkAutoTMalloc<uint32_t> data(256 * 256 * 3);
1.150 + uint32_t* srcData = data.get();
1.151 + uint32_t* firstRead = data.get() + 256 * 256;
1.152 + uint32_t* secondRead = data.get() + 2 * 256 * 256;
1.153 +
1.154 + // Fill with every possible premultiplied A, color channel value. There will be 256-y duplicate
1.155 + // values in row y. We set r,g, and b to the same value since they are handled identically.
1.156 + for (int y = 0; y < 256; ++y) {
1.157 + for (int x = 0; x < 256; ++x) {
1.158 + uint8_t* color = reinterpret_cast<uint8_t*>(&srcData[256*y + x]);
1.159 + color[3] = y;
1.160 + color[2] = GrMin(x, y);
1.161 + color[1] = GrMin(x, y);
1.162 + color[0] = GrMin(x, y);
1.163 + }
1.164 + }
1.165 +
1.166 + GrTextureDesc desc;
1.167 + desc.fFlags = kRenderTarget_GrTextureFlagBit |
1.168 + kNoStencil_GrTextureFlagBit;
1.169 + desc.fWidth = 256;
1.170 + desc.fHeight = 256;
1.171 + desc.fConfig = kRGBA_8888_GrPixelConfig;
1.172 +
1.173 + SkAutoTUnref<GrTexture> readTex(context->createUncachedTexture(desc, NULL, 0));
1.174 + if (!readTex.get()) {
1.175 + return;
1.176 + }
1.177 + SkAutoTUnref<GrTexture> tempTex(context->createUncachedTexture(desc, NULL, 0));
1.178 + if (!tempTex.get()) {
1.179 + return;
1.180 + }
1.181 + desc.fFlags = kNone_GrTextureFlags;
1.182 + SkAutoTUnref<GrTexture> dataTex(context->createUncachedTexture(desc, data, 0));
1.183 + if (!dataTex.get()) {
1.184 + return;
1.185 + }
1.186 +
1.187 + static const PMConversion kConversionRules[][2] = {
1.188 + {kDivByAlpha_RoundDown_PMConversion, kMulByAlpha_RoundUp_PMConversion},
1.189 + {kDivByAlpha_RoundUp_PMConversion, kMulByAlpha_RoundDown_PMConversion},
1.190 + };
1.191 +
1.192 + GrContext::AutoWideOpenIdentityDraw awoid(context, NULL);
1.193 +
1.194 + bool failed = true;
1.195 +
1.196 + for (size_t i = 0; i < GR_ARRAY_COUNT(kConversionRules) && failed; ++i) {
1.197 + *pmToUPMRule = kConversionRules[i][0];
1.198 + *upmToPMRule = kConversionRules[i][1];
1.199 +
1.200 + static const SkRect kDstRect = SkRect::MakeWH(SkIntToScalar(256), SkIntToScalar(256));
1.201 + static const SkRect kSrcRect = SkRect::MakeWH(SK_Scalar1, SK_Scalar1);
1.202 + // We do a PM->UPM draw from dataTex to readTex and read the data. Then we do a UPM->PM draw
1.203 + // from readTex to tempTex followed by a PM->UPM draw to readTex and finally read the data.
1.204 + // We then verify that two reads produced the same values.
1.205 +
1.206 + AutoEffectUnref pmToUPM1(SkNEW_ARGS(GrConfigConversionEffect, (dataTex,
1.207 + false,
1.208 + *pmToUPMRule,
1.209 + SkMatrix::I())));
1.210 + AutoEffectUnref upmToPM(SkNEW_ARGS(GrConfigConversionEffect, (readTex,
1.211 + false,
1.212 + *upmToPMRule,
1.213 + SkMatrix::I())));
1.214 + AutoEffectUnref pmToUPM2(SkNEW_ARGS(GrConfigConversionEffect, (tempTex,
1.215 + false,
1.216 + *pmToUPMRule,
1.217 + SkMatrix::I())));
1.218 +
1.219 + SkAutoTUnref<GrEffectRef> pmToUPMEffect1(CreateEffectRef(pmToUPM1));
1.220 + SkAutoTUnref<GrEffectRef> upmToPMEffect(CreateEffectRef(upmToPM));
1.221 + SkAutoTUnref<GrEffectRef> pmToUPMEffect2(CreateEffectRef(pmToUPM2));
1.222 +
1.223 + context->setRenderTarget(readTex->asRenderTarget());
1.224 + GrPaint paint1;
1.225 + paint1.addColorEffect(pmToUPMEffect1);
1.226 + context->drawRectToRect(paint1, kDstRect, kSrcRect);
1.227 +
1.228 + readTex->readPixels(0, 0, 256, 256, kRGBA_8888_GrPixelConfig, firstRead);
1.229 +
1.230 + context->setRenderTarget(tempTex->asRenderTarget());
1.231 + GrPaint paint2;
1.232 + paint2.addColorEffect(upmToPMEffect);
1.233 + context->drawRectToRect(paint2, kDstRect, kSrcRect);
1.234 + context->setRenderTarget(readTex->asRenderTarget());
1.235 +
1.236 + GrPaint paint3;
1.237 + paint3.addColorEffect(pmToUPMEffect2);
1.238 + context->drawRectToRect(paint3, kDstRect, kSrcRect);
1.239 +
1.240 + readTex->readPixels(0, 0, 256, 256, kRGBA_8888_GrPixelConfig, secondRead);
1.241 +
1.242 + failed = false;
1.243 + for (int y = 0; y < 256 && !failed; ++y) {
1.244 + for (int x = 0; x <= y; ++x) {
1.245 + if (firstRead[256 * y + x] != secondRead[256 * y + x]) {
1.246 + failed = true;
1.247 + break;
1.248 + }
1.249 + }
1.250 + }
1.251 + }
1.252 + if (failed) {
1.253 + *pmToUPMRule = kNone_PMConversion;
1.254 + *upmToPMRule = kNone_PMConversion;
1.255 + }
1.256 +}
1.257 +
1.258 +const GrEffectRef* GrConfigConversionEffect::Create(GrTexture* texture,
1.259 + bool swapRedAndBlue,
1.260 + PMConversion pmConversion,
1.261 + const SkMatrix& matrix) {
1.262 + if (!swapRedAndBlue && kNone_PMConversion == pmConversion) {
1.263 + // If we returned a GrConfigConversionEffect that was equivalent to a GrSimpleTextureEffect
1.264 + // then we may pollute our texture cache with redundant shaders. So in the case that no
1.265 + // conversions were requested we instead return a GrSimpleTextureEffect.
1.266 + return GrSimpleTextureEffect::Create(texture, matrix);
1.267 + } else {
1.268 + if (kRGBA_8888_GrPixelConfig != texture->config() &&
1.269 + kBGRA_8888_GrPixelConfig != texture->config() &&
1.270 + kNone_PMConversion != pmConversion) {
1.271 + // The PM conversions assume colors are 0..255
1.272 + return NULL;
1.273 + }
1.274 + AutoEffectUnref effect(SkNEW_ARGS(GrConfigConversionEffect, (texture,
1.275 + swapRedAndBlue,
1.276 + pmConversion,
1.277 + matrix)));
1.278 + return CreateEffectRef(effect);
1.279 + }
1.280 +}
