| /* |
| * Copyright 2013 The Android Open Source Project |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "include/effects/SkXfermodeImageFilter.h" |
| |
| #include "include/core/SkCanvas.h" |
| #include "include/private/SkColorData.h" |
| #include "src/core/SkImageFilter_Base.h" |
| #include "src/core/SkReadBuffer.h" |
| #include "src/core/SkSpecialImage.h" |
| #include "src/core/SkSpecialSurface.h" |
| #include "src/core/SkWriteBuffer.h" |
| #if SK_SUPPORT_GPU |
| #include "include/gpu/GrRecordingContext.h" |
| #include "src/gpu/GrCaps.h" |
| #include "src/gpu/GrColorSpaceXform.h" |
| #include "src/gpu/GrRecordingContextPriv.h" |
| #include "src/gpu/GrSurfaceDrawContext.h" |
| #include "src/gpu/GrTextureProxy.h" |
| #include "src/gpu/SkGr.h" |
| #include "src/gpu/effects/GrTextureEffect.h" |
| #include "src/gpu/effects/generated/GrConstColorProcessor.h" |
| #endif |
| #include "src/core/SkClipOpPriv.h" |
| |
| namespace { |
| |
| class SkXfermodeImageFilterImpl : public SkImageFilter_Base { |
| public: |
| SkXfermodeImageFilterImpl(SkBlendMode mode, sk_sp<SkImageFilter> inputs[2], |
| const CropRect* cropRect) |
| : INHERITED(inputs, 2, cropRect) |
| , fMode(mode) {} |
| |
| protected: |
| sk_sp<SkSpecialImage> onFilterImage(const Context&, SkIPoint* offset) const override; |
| |
| SkIRect onFilterBounds(const SkIRect&, const SkMatrix& ctm, |
| MapDirection, const SkIRect* inputRect) const override; |
| |
| #if SK_SUPPORT_GPU |
| sk_sp<SkSpecialImage> filterImageGPU(const Context& ctx, |
| sk_sp<SkSpecialImage> background, |
| const SkIPoint& backgroundOffset, |
| sk_sp<SkSpecialImage> foreground, |
| const SkIPoint& foregroundOffset, |
| const SkIRect& bounds) const; |
| #endif |
| |
| void flatten(SkWriteBuffer&) const override; |
| |
| void drawForeground(SkCanvas* canvas, SkSpecialImage*, const SkIRect&) const; |
| |
| private: |
| friend void SkXfermodeImageFilter::RegisterFlattenables(); |
| SK_FLATTENABLE_HOOKS(SkXfermodeImageFilterImpl) |
| |
| SkBlendMode fMode; |
| |
| using INHERITED = SkImageFilter_Base; |
| }; |
| |
| } // end namespace |
| |
| sk_sp<SkImageFilter> SkXfermodeImageFilter::Make(SkBlendMode mode, |
| sk_sp<SkImageFilter> background, |
| sk_sp<SkImageFilter> foreground, |
| const SkImageFilter::CropRect* cropRect) { |
| sk_sp<SkImageFilter> inputs[2] = { std::move(background), std::move(foreground) }; |
| return sk_sp<SkImageFilter>(new SkXfermodeImageFilterImpl(mode, inputs, cropRect)); |
| } |
| |
| void SkXfermodeImageFilter::RegisterFlattenables() { |
| SK_REGISTER_FLATTENABLE(SkXfermodeImageFilterImpl); |
| // TODO (michaelludwig) - Remove after grace period for SKPs to stop using old name |
| SkFlattenable::Register("SkXfermodeImageFilter_Base", SkXfermodeImageFilterImpl::CreateProc); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| static unsigned unflatten_blendmode(SkReadBuffer& buffer) { |
| unsigned mode = buffer.read32(); |
| (void)buffer.validate(mode <= (unsigned)SkBlendMode::kLastMode); |
| return mode; |
| } |
| |
| sk_sp<SkFlattenable> SkXfermodeImageFilterImpl::CreateProc(SkReadBuffer& buffer) { |
| SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 2); |
| unsigned mode = unflatten_blendmode(buffer); |
| if (!buffer.isValid()) { |
| return nullptr; |
| } |
| return SkXfermodeImageFilter::Make((SkBlendMode)mode, common.getInput(0), |
| common.getInput(1), &common.cropRect()); |
| } |
| |
| void SkXfermodeImageFilterImpl::flatten(SkWriteBuffer& buffer) const { |
| this->INHERITED::flatten(buffer); |
| buffer.write32((unsigned)fMode); |
| } |
| |
| sk_sp<SkSpecialImage> SkXfermodeImageFilterImpl::onFilterImage(const Context& ctx, |
| SkIPoint* offset) const { |
| SkIPoint backgroundOffset = SkIPoint::Make(0, 0); |
| sk_sp<SkSpecialImage> background(this->filterInput(0, ctx, &backgroundOffset)); |
| |
| SkIPoint foregroundOffset = SkIPoint::Make(0, 0); |
| sk_sp<SkSpecialImage> foreground(this->filterInput(1, ctx, &foregroundOffset)); |
| |
| SkIRect foregroundBounds = SkIRect::MakeEmpty(); |
| if (foreground) { |
| foregroundBounds = SkIRect::MakeXYWH(foregroundOffset.x(), foregroundOffset.y(), |
| foreground->width(), foreground->height()); |
| } |
| |
| SkIRect srcBounds = SkIRect::MakeEmpty(); |
| if (background) { |
| srcBounds = SkIRect::MakeXYWH(backgroundOffset.x(), backgroundOffset.y(), |
| background->width(), background->height()); |
| } |
| |
| srcBounds.join(foregroundBounds); |
| if (srcBounds.isEmpty()) { |
| return nullptr; |
| } |
| |
| SkIRect bounds; |
| if (!this->applyCropRect(ctx, srcBounds, &bounds)) { |
| return nullptr; |
| } |
| |
| offset->fX = bounds.left(); |
| offset->fY = bounds.top(); |
| |
| #if SK_SUPPORT_GPU |
| if (ctx.gpuBacked()) { |
| return this->filterImageGPU(ctx, background, backgroundOffset, |
| foreground, foregroundOffset, bounds); |
| } |
| #endif |
| |
| sk_sp<SkSpecialSurface> surf(ctx.makeSurface(bounds.size())); |
| if (!surf) { |
| return nullptr; |
| } |
| |
| SkCanvas* canvas = surf->getCanvas(); |
| SkASSERT(canvas); |
| |
| canvas->clear(0x0); // can't count on background to fully clear the background |
| canvas->translate(SkIntToScalar(-bounds.left()), SkIntToScalar(-bounds.top())); |
| |
| if (background) { |
| SkPaint paint; |
| paint.setBlendMode(SkBlendMode::kSrc); |
| background->draw(canvas, |
| SkIntToScalar(backgroundOffset.fX), SkIntToScalar(backgroundOffset.fY), |
| &paint); |
| } |
| |
| this->drawForeground(canvas, foreground.get(), foregroundBounds); |
| |
| return surf->makeImageSnapshot(); |
| } |
| |
| SkIRect SkXfermodeImageFilterImpl::onFilterBounds(const SkIRect& src, |
| const SkMatrix& ctm, |
| MapDirection dir, |
| const SkIRect* inputRect) const { |
| if (kReverse_MapDirection == dir) { |
| return INHERITED::onFilterBounds(src, ctm, dir, inputRect); |
| } |
| |
| SkASSERT(!inputRect); |
| SkASSERT(2 == this->countInputs()); |
| auto getBackground = [&]() { |
| return this->getInput(0) ? this->getInput(0)->filterBounds(src, ctm, dir, inputRect) : src; |
| }; |
| auto getForeground = [&]() { |
| return this->getInput(1) ? this->getInput(1)->filterBounds(src, ctm, dir, inputRect) : src; |
| }; |
| switch (fMode) { |
| case SkBlendMode::kClear: |
| return SkIRect::MakeEmpty(); |
| |
| case SkBlendMode::kSrc: |
| case SkBlendMode::kDstATop: |
| return getForeground(); |
| |
| case SkBlendMode::kDst: |
| case SkBlendMode::kSrcATop: |
| return getBackground(); |
| |
| case SkBlendMode::kSrcIn: |
| case SkBlendMode::kDstIn: { |
| auto result = getBackground(); |
| if (!result.intersect(getForeground())) { |
| return SkIRect::MakeEmpty(); |
| } |
| return result; |
| } |
| |
| default: { |
| auto result = getBackground(); |
| result.join(getForeground()); |
| return result; |
| } |
| } |
| } |
| |
| void SkXfermodeImageFilterImpl::drawForeground(SkCanvas* canvas, SkSpecialImage* img, |
| const SkIRect& fgBounds) const { |
| SkPaint paint; |
| paint.setBlendMode(fMode); |
| if (img) { |
| img->draw(canvas, SkIntToScalar(fgBounds.fLeft), SkIntToScalar(fgBounds.fTop), &paint); |
| } |
| |
| SkAutoCanvasRestore acr(canvas, true); |
| canvas->clipRect(SkRect::Make(fgBounds), kDifference_SkClipOp); |
| paint.setColor(0); |
| canvas->drawPaint(paint); |
| } |
| |
| #if SK_SUPPORT_GPU |
| |
| #include "src/gpu/effects/GrBlendFragmentProcessor.h" |
| |
| sk_sp<SkSpecialImage> SkXfermodeImageFilterImpl::filterImageGPU( |
| const Context& ctx, |
| sk_sp<SkSpecialImage> background, |
| const SkIPoint& backgroundOffset, |
| sk_sp<SkSpecialImage> foreground, |
| const SkIPoint& foregroundOffset, |
| const SkIRect& bounds) const { |
| SkASSERT(ctx.gpuBacked()); |
| |
| auto context = ctx.getContext(); |
| |
| GrSurfaceProxyView backgroundView, foregroundView; |
| |
| if (background) { |
| backgroundView = background->view(context); |
| } |
| |
| if (foreground) { |
| foregroundView = foreground->view(context); |
| } |
| |
| GrPaint paint; |
| std::unique_ptr<GrFragmentProcessor> fp; |
| const auto& caps = *ctx.getContext()->priv().caps(); |
| GrSamplerState sampler(GrSamplerState::WrapMode::kClampToBorder, |
| GrSamplerState::Filter::kNearest); |
| |
| if (backgroundView.asTextureProxy()) { |
| SkRect bgSubset = SkRect::Make(background->subset()); |
| SkMatrix bgMatrix = SkMatrix::Translate( |
| SkIntToScalar(bgSubset.left() - backgroundOffset.fX), |
| SkIntToScalar(bgSubset.top() - backgroundOffset.fY)); |
| fp = GrTextureEffect::MakeSubset(std::move(backgroundView), background->alphaType(), |
| bgMatrix, sampler, bgSubset, caps); |
| fp = GrColorSpaceXformEffect::Make(std::move(fp), background->getColorSpace(), |
| background->alphaType(), ctx.colorSpace(), |
| kPremul_SkAlphaType); |
| } else { |
| fp = GrConstColorProcessor::Make(SK_PMColor4fTRANSPARENT); |
| } |
| |
| if (foregroundView.asTextureProxy()) { |
| SkRect fgSubset = SkRect::Make(foreground->subset()); |
| SkMatrix fgMatrix = SkMatrix::Translate( |
| SkIntToScalar(fgSubset.left() - foregroundOffset.fX), |
| SkIntToScalar(fgSubset.top() - foregroundOffset.fY)); |
| auto fgFP = GrTextureEffect::MakeSubset(std::move(foregroundView), foreground->alphaType(), |
| fgMatrix, sampler, fgSubset, caps); |
| fgFP = GrColorSpaceXformEffect::Make(std::move(fgFP), foreground->getColorSpace(), |
| foreground->alphaType(), ctx.colorSpace(), |
| kPremul_SkAlphaType); |
| fp = GrBlendFragmentProcessor::Make(std::move(fgFP), std::move(fp), fMode); |
| } |
| |
| paint.setColorFragmentProcessor(std::move(fp)); |
| paint.setPorterDuffXPFactory(SkBlendMode::kSrc); |
| |
| auto surfaceDrawContext = GrSurfaceDrawContext::Make( |
| context, ctx.grColorType(), ctx.refColorSpace(), SkBackingFit::kApprox, bounds.size()); |
| if (!surfaceDrawContext) { |
| return nullptr; |
| } |
| |
| SkMatrix matrix; |
| matrix.setTranslate(SkIntToScalar(-bounds.left()), SkIntToScalar(-bounds.top())); |
| surfaceDrawContext->drawRect(nullptr, std::move(paint), GrAA::kNo, matrix, |
| SkRect::Make(bounds)); |
| |
| return SkSpecialImage::MakeDeferredFromGpu(context, |
| SkIRect::MakeWH(bounds.width(), bounds.height()), |
| kNeedNewImageUniqueID_SpecialImage, |
| surfaceDrawContext->readSurfaceView(), |
| surfaceDrawContext->colorInfo().colorType(), |
| surfaceDrawContext->colorInfo().refColorSpace()); |
| } |
| |
| #endif |