sk_sp<SkSpecialImage> SkXfermodeImageFilter::filterImageGPU(SkSpecialImage* source, sk_sp<SkSpecialImage> background, const SkIPoint& backgroundOffset, sk_sp<SkSpecialImage> foreground, const SkIPoint& foregroundOffset, const SkIRect& bounds) const { SkASSERT(source->isTextureBacked()); GrContext* context = source->getContext(); sk_sp<GrTexture> backgroundTex, foregroundTex; if (background) { backgroundTex = background->asTextureRef(context); } if (foreground) { foregroundTex = foreground->asTextureRef(context); } GrPaint paint; // SRGBTODO: AllowSRGBInputs? sk_sp<GrFragmentProcessor> bgFP; if (backgroundTex) { SkMatrix backgroundMatrix; backgroundMatrix.setIDiv(backgroundTex->width(), backgroundTex->height()); backgroundMatrix.preTranslate(SkIntToScalar(-backgroundOffset.fX), SkIntToScalar(-backgroundOffset.fY)); bgFP = GrTextureDomainEffect::Make( backgroundTex.get(), nullptr, backgroundMatrix, GrTextureDomain::MakeTexelDomain(backgroundTex.get(), background->subset()), GrTextureDomain::kDecal_Mode, GrTextureParams::kNone_FilterMode); } else { bgFP = GrConstColorProcessor::Make(GrColor_TRANSPARENT_BLACK, GrConstColorProcessor::kIgnore_InputMode); } if (foregroundTex) { SkMatrix foregroundMatrix; foregroundMatrix.setIDiv(foregroundTex->width(), foregroundTex->height()); foregroundMatrix.preTranslate(SkIntToScalar(-foregroundOffset.fX), SkIntToScalar(-foregroundOffset.fY)); sk_sp<GrFragmentProcessor> foregroundFP; foregroundFP = GrTextureDomainEffect::Make( foregroundTex.get(), nullptr, foregroundMatrix, GrTextureDomain::MakeTexelDomain(foregroundTex.get(), foreground->subset()), GrTextureDomain::kDecal_Mode, GrTextureParams::kNone_FilterMode); paint.addColorFragmentProcessor(std::move(foregroundFP)); // A null fMode is interpreted to mean kSrcOver_Mode (to match raster). SkAutoTUnref<SkXfermode> mode(SkSafeRef(fMode.get())); if (!mode) { // It would be awesome to use SkXfermode::Create here but it knows better // than us and won't return a kSrcOver_Mode SkXfermode. That means we // have to get one the hard way. struct ProcCoeff rec; rec.fProc = SkXfermode::GetProc(SkXfermode::kSrcOver_Mode); SkXfermode::ModeAsCoeff(SkXfermode::kSrcOver_Mode, &rec.fSC, &rec.fDC); mode.reset(new SkProcCoeffXfermode(rec, SkXfermode::kSrcOver_Mode)); } sk_sp<GrFragmentProcessor> xferFP( mode->makeFragmentProcessorForImageFilter(std::move(bgFP))); // A null 'xferFP' here means kSrc_Mode was used in which case we can just proceed if (xferFP) { paint.addColorFragmentProcessor(std::move(xferFP)); } } else { paint.addColorFragmentProcessor(std::move(bgFP)); } paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode); sk_sp<GrDrawContext> drawContext(context->makeDrawContext(SkBackingFit::kApprox, bounds.width(), bounds.height(), kSkia8888_GrPixelConfig, sk_ref_sp(source->getColorSpace()))); if (!drawContext) { return nullptr; } SkMatrix matrix; matrix.setTranslate(SkIntToScalar(-bounds.left()), SkIntToScalar(-bounds.top())); drawContext->drawRect(GrNoClip(), paint, matrix, SkRect::Make(bounds)); return SkSpecialImage::MakeFromGpu(SkIRect::MakeWH(bounds.width(), bounds.height()), kNeedNewImageUniqueID_SpecialImage, drawContext->asTexture(), sk_ref_sp(drawContext->getColorSpace())); }