void GrConfigConversionEffect::TestForPreservingPMConversions(GrContext* context,
PMConversion* pmToUPMRule,
PMConversion* upmToPMRule) {
*pmToUPMRule = kNone_PMConversion;
*upmToPMRule = kNone_PMConversion;
SkAutoTMalloc<uint32_t> data(256 * 256 * 3);
uint32_t* srcData = data.get();
uint32_t* firstRead = data.get() + 256 * 256;
uint32_t* secondRead = data.get() + 2 * 256 * 256;
// Fill with every possible premultiplied A, color channel value. There will be 256-y duplicate
// values in row y. We set r,g, and b to the same value since they are handled identically.
for (int y = 0; y < 256; ++y) {
for (int x = 0; x < 256; ++x) {
uint8_t* color = reinterpret_cast<uint8_t*>(&srcData[256*y + x]);
color[3] = y;
color[2] = SkTMin(x, y);
color[1] = SkTMin(x, y);
color[0] = SkTMin(x, y);
}
}
GrSurfaceDesc desc;
desc.fFlags = kRenderTarget_GrSurfaceFlag;
desc.fWidth = 256;
desc.fHeight = 256;
desc.fConfig = kRGBA_8888_GrPixelConfig;
SkAutoTUnref<GrTexture> readTex(context->textureProvider()->createTexture(desc, true, nullptr, 0));
if (!readTex.get()) {
return;
}
SkAutoTUnref<GrTexture> tempTex(context->textureProvider()->createTexture(desc, true, nullptr, 0));
if (!tempTex.get()) {
return;
}
desc.fFlags = kNone_GrSurfaceFlags;
SkAutoTUnref<GrTexture> dataTex(context->textureProvider()->createTexture(desc, true, data, 0));
if (!dataTex.get()) {
return;
}
static const PMConversion kConversionRules[][2] = {
{kDivByAlpha_RoundDown_PMConversion, kMulByAlpha_RoundUp_PMConversion},
{kDivByAlpha_RoundUp_PMConversion, kMulByAlpha_RoundDown_PMConversion},
};
bool failed = true;
for (size_t i = 0; i < SK_ARRAY_COUNT(kConversionRules) && failed; ++i) {
*pmToUPMRule = kConversionRules[i][0];
*upmToPMRule = kConversionRules[i][1];
static const SkRect kDstRect = SkRect::MakeWH(SkIntToScalar(256), SkIntToScalar(256));
static const SkRect kSrcRect = SkRect::MakeWH(SK_Scalar1, SK_Scalar1);
// We do a PM->UPM draw from dataTex to readTex and read the data. Then we do a UPM->PM draw
// from readTex to tempTex followed by a PM->UPM draw to readTex and finally read the data.
// We then verify that two reads produced the same values.
GrPaint paint1;
GrPaint paint2;
GrPaint paint3;
SkAutoTUnref<GrFragmentProcessor> pmToUPM1(new GrConfigConversionEffect(
paint1.getProcessorDataManager(), dataTex, false, *pmToUPMRule, SkMatrix::I()));
SkAutoTUnref<GrFragmentProcessor> upmToPM(new GrConfigConversionEffect(
paint2.getProcessorDataManager(), readTex, false, *upmToPMRule, SkMatrix::I()));
SkAutoTUnref<GrFragmentProcessor> pmToUPM2(new GrConfigConversionEffect(
paint3.getProcessorDataManager(), tempTex, false, *pmToUPMRule, SkMatrix::I()));
paint1.addColorFragmentProcessor(pmToUPM1);
SkAutoTUnref<GrDrawContext> readDrawContext(context->drawContext());
if (!readDrawContext) {
failed = true;
break;
}
readDrawContext->drawNonAARectToRect(readTex->asRenderTarget(),
GrClip::WideOpen(),
paint1,
SkMatrix::I(),
kDstRect,
kSrcRect);
readTex->readPixels(0, 0, 256, 256, kRGBA_8888_GrPixelConfig, firstRead);
paint2.addColorFragmentProcessor(upmToPM);
SkAutoTUnref<GrDrawContext> tempDrawContext(context->drawContext());
if (!tempDrawContext) {
failed = true;
break;
}
tempDrawContext->drawNonAARectToRect(tempTex->asRenderTarget(),
GrClip::WideOpen(),
paint2,
SkMatrix::I(),
kDstRect,
kSrcRect);
paint3.addColorFragmentProcessor(pmToUPM2);
readDrawContext.reset(context->drawContext());
if (!readDrawContext) {
failed = true;
break;
}
readDrawContext->drawNonAARectToRect(readTex->asRenderTarget(),
GrClip::WideOpen(),
paint3,
SkMatrix::I(),
kDstRect,
kSrcRect);
readTex->readPixels(0, 0, 256, 256, kRGBA_8888_GrPixelConfig, secondRead);
failed = false;
for (int y = 0; y < 256 && !failed; ++y) {
for (int x = 0; x <= y; ++x) {
if (firstRead[256 * y + x] != secondRead[256 * y + x]) {
failed = true;
break;
}
}
}
}
if (failed) {
*pmToUPMRule = kNone_PMConversion;
*upmToPMRule = kNone_PMConversion;
}
}
void GrConfigConversionEffect::TestForPreservingPMConversions(GrContext* context,
PMConversion* pmToUPMRule,
PMConversion* upmToPMRule) {
*pmToUPMRule = kNone_PMConversion;
*upmToPMRule = kNone_PMConversion;
static constexpr int kSize = 256;
static constexpr GrPixelConfig kConfig = kRGBA_8888_GrPixelConfig;
SkAutoTMalloc<uint32_t> data(kSize * kSize * 3);
uint32_t* srcData = data.get();
uint32_t* firstRead = data.get() + kSize * kSize;
uint32_t* secondRead = data.get() + 2 * kSize * kSize;
// Fill with every possible premultiplied A, color channel value. There will be 256-y duplicate
// values in row y. We set r,g, and b to the same value since they are handled identically.
for (int y = 0; y < kSize; ++y) {
for (int x = 0; x < kSize; ++x) {
uint8_t* color = reinterpret_cast<uint8_t*>(&srcData[kSize*y + x]);
color[3] = y;
color[2] = SkTMin(x, y);
color[1] = SkTMin(x, y);
color[0] = SkTMin(x, y);
}
}
sk_sp<GrDrawContext> readDC(context->makeDrawContext(SkBackingFit::kExact, kSize, kSize,
kConfig, nullptr));
sk_sp<GrDrawContext> tempDC(context->makeDrawContext(SkBackingFit::kExact, kSize, kSize,
kConfig, nullptr));
if (!readDC || !tempDC) {
return;
}
GrSurfaceDesc desc;
desc.fWidth = kSize;
desc.fHeight = kSize;
desc.fConfig = kConfig;
SkAutoTUnref<GrTexture> dataTex(context->textureProvider()->createTexture(
desc, SkBudgeted::kYes, data, 0));
if (!dataTex.get()) {
return;
}
static const PMConversion kConversionRules[][2] = {
{kDivByAlpha_RoundDown_PMConversion, kMulByAlpha_RoundUp_PMConversion},
{kDivByAlpha_RoundUp_PMConversion, kMulByAlpha_RoundDown_PMConversion},
};
bool failed = true;
for (size_t i = 0; i < SK_ARRAY_COUNT(kConversionRules) && failed; ++i) {
*pmToUPMRule = kConversionRules[i][0];
*upmToPMRule = kConversionRules[i][1];
static const SkRect kDstRect = SkRect::MakeIWH(kSize, kSize);
static const SkRect kSrcRect = SkRect::MakeIWH(1, 1);
// We do a PM->UPM draw from dataTex to readTex and read the data. Then we do a UPM->PM draw
// from readTex to tempTex followed by a PM->UPM draw to readTex and finally read the data.
// We then verify that two reads produced the same values.
GrPaint paint1;
GrPaint paint2;
GrPaint paint3;
sk_sp<GrFragmentProcessor> pmToUPM1(new GrConfigConversionEffect(
dataTex, GrSwizzle::RGBA(), *pmToUPMRule, SkMatrix::I()));
sk_sp<GrFragmentProcessor> upmToPM(new GrConfigConversionEffect(
readDC->asTexture().get(), GrSwizzle::RGBA(), *upmToPMRule, SkMatrix::I()));
sk_sp<GrFragmentProcessor> pmToUPM2(new GrConfigConversionEffect(
tempDC->asTexture().get(), GrSwizzle::RGBA(), *pmToUPMRule, SkMatrix::I()));
paint1.addColorFragmentProcessor(std::move(pmToUPM1));
paint1.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
readDC->fillRectToRect(GrNoClip(), paint1, SkMatrix::I(), kDstRect, kSrcRect);
readDC->asTexture()->readPixels(0, 0, kSize, kSize, kConfig, firstRead);
paint2.addColorFragmentProcessor(std::move(upmToPM));
paint2.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
tempDC->fillRectToRect(GrNoClip(), paint2, SkMatrix::I(), kDstRect, kSrcRect);
paint3.addColorFragmentProcessor(std::move(pmToUPM2));
paint3.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
readDC->fillRectToRect(GrNoClip(), paint3, SkMatrix::I(), kDstRect, kSrcRect);
readDC->asTexture()->readPixels(0, 0, kSize, kSize, kConfig, secondRead);
failed = false;
for (int y = 0; y < kSize && !failed; ++y) {
for (int x = 0; x <= y; ++x) {
if (firstRead[kSize * y + x] != secondRead[kSize * y + x]) {
failed = true;
break;
}
}
}
}
if (failed) {
*pmToUPMRule = kNone_PMConversion;
*upmToPMRule = kNone_PMConversion;
}
}