| /* |
| * Copyright 2013 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "include/effects/SkComposeImageFilter.h" |
| |
| #include "src/core/SkImageFilter_Base.h" |
| #include "src/core/SkReadBuffer.h" |
| #include "src/core/SkSpecialImage.h" |
| #include "src/core/SkWriteBuffer.h" |
| |
| namespace { |
| |
| class SkComposeImageFilterImpl final : public SkImageFilter_Base { |
| public: |
| explicit SkComposeImageFilterImpl(sk_sp<SkImageFilter> inputs[2]) |
| : INHERITED(inputs, 2, nullptr) { |
| SkASSERT(inputs[0].get()); |
| SkASSERT(inputs[1].get()); |
| } |
| |
| SkRect computeFastBounds(const SkRect& src) const override; |
| |
| protected: |
| sk_sp<SkSpecialImage> onFilterImage(SkSpecialImage* source, const Context&, |
| SkIPoint* offset) const override; |
| SkIRect onFilterBounds(const SkIRect&, const SkMatrix& ctm, |
| MapDirection, const SkIRect* inputRect) const override; |
| bool onCanHandleComplexCTM() const override { return true; } |
| |
| private: |
| friend void SkComposeImageFilter::RegisterFlattenables(); |
| SK_FLATTENABLE_HOOKS(SkComposeImageFilterImpl) |
| |
| typedef SkImageFilter_Base INHERITED; |
| }; |
| |
| } // end namespace |
| |
| sk_sp<SkImageFilter> SkComposeImageFilter::Make(sk_sp<SkImageFilter> outer, |
| sk_sp<SkImageFilter> inner) { |
| if (!outer) { |
| return inner; |
| } |
| if (!inner) { |
| return outer; |
| } |
| sk_sp<SkImageFilter> inputs[2] = { std::move(outer), std::move(inner) }; |
| return sk_sp<SkImageFilter>(new SkComposeImageFilterImpl(inputs)); |
| } |
| |
| void SkComposeImageFilter::RegisterFlattenables() { |
| SK_REGISTER_FLATTENABLE(SkComposeImageFilterImpl); |
| // TODO (michaelludwig) - Remove after grace period for SKPs to stop using old name |
| SkFlattenable::Register("SkComposeImageFilter", SkComposeImageFilterImpl::CreateProc); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| sk_sp<SkFlattenable> SkComposeImageFilterImpl::CreateProc(SkReadBuffer& buffer) { |
| SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 2); |
| return SkComposeImageFilter::Make(common.getInput(0), common.getInput(1)); |
| } |
| |
| SkRect SkComposeImageFilterImpl::computeFastBounds(const SkRect& src) const { |
| const SkImageFilter* outer = this->getInput(0); |
| const SkImageFilter* inner = this->getInput(1); |
| |
| return outer->computeFastBounds(inner->computeFastBounds(src)); |
| } |
| |
| sk_sp<SkSpecialImage> SkComposeImageFilterImpl::onFilterImage(SkSpecialImage* source, |
| const Context& ctx, |
| SkIPoint* offset) const { |
| // The bounds passed to the inner filter must be filtered by the outer |
| // filter, so that the inner filter produces the pixels that the outer |
| // filter requires as input. This matters if the outer filter moves pixels. |
| SkIRect innerClipBounds; |
| innerClipBounds = this->getInput(0)->filterBounds(ctx.clipBounds(), ctx.ctm(), |
| kReverse_MapDirection, &ctx.clipBounds()); |
| Context innerContext(ctx.ctm(), innerClipBounds, ctx.cache(), ctx.outputProperties()); |
| SkIPoint innerOffset = SkIPoint::Make(0, 0); |
| sk_sp<SkSpecialImage> inner(this->filterInput(1, source, innerContext, &innerOffset)); |
| if (!inner) { |
| return nullptr; |
| } |
| |
| SkMatrix outerMatrix(ctx.ctm()); |
| outerMatrix.postTranslate(SkIntToScalar(-innerOffset.x()), SkIntToScalar(-innerOffset.y())); |
| SkIRect clipBounds = ctx.clipBounds(); |
| clipBounds.offset(-innerOffset.x(), -innerOffset.y()); |
| Context outerContext(outerMatrix, clipBounds, ctx.cache(), ctx.outputProperties()); |
| |
| SkIPoint outerOffset = SkIPoint::Make(0, 0); |
| sk_sp<SkSpecialImage> outer(this->filterInput(0, inner.get(), outerContext, &outerOffset)); |
| if (!outer) { |
| return nullptr; |
| } |
| |
| *offset = innerOffset + outerOffset; |
| return outer; |
| } |
| |
| SkIRect SkComposeImageFilterImpl::onFilterBounds(const SkIRect& src, const SkMatrix& ctm, |
| MapDirection dir, const SkIRect* inputRect) const { |
| const SkImageFilter* outer = this->getInput(0); |
| const SkImageFilter* inner = this->getInput(1); |
| |
| const SkIRect innerRect = inner->filterBounds(src, ctm, dir, inputRect); |
| return outer->filterBounds(innerRect, ctm, dir, |
| kReverse_MapDirection == dir ? &innerRect : nullptr); |
| } |