/* * Copyright 2018 Google Inc. * * Use of this source code is governed by a BSD-style license that can be * found in the LICENSE file. */ #include "SkSGMaskEffect.h" #include "SkCanvas.h" namespace sksg { MaskEffect::MaskEffect(sk_sp<RenderNode> child, sk_sp<RenderNode> mask) : INHERITED(std::move(child)) , fMaskNode(std::move(mask)) { this->observeInval(fMaskNode); } MaskEffect::~MaskEffect() { this->unobserveInval(fMaskNode); } void MaskEffect::onRender(SkCanvas* canvas) const { if (this->bounds().isEmpty()) return; SkAutoCanvasRestore acr(canvas, false); canvas->saveLayer(this->bounds(), nullptr); fMaskNode->render(canvas); SkPaint p; p.setBlendMode(SkBlendMode::kSrcIn); canvas->saveLayer(this->bounds(), &p); this->INHERITED::onRender(canvas); } SkRect MaskEffect::onRevalidate(InvalidationController* ic, const SkMatrix& ctm) { SkASSERT(this->hasInval()); const auto maskBounds = fMaskNode->revalidate(ic, ctm); auto childBounds = this->INHERITED::onRevalidate(ic, ctm); return childBounds.intersect(maskBounds) ? childBounds : SkRect::MakeEmpty(); } } // namespace sksg