1 /* 2 * Copyright 2018 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "SkSGMaskEffect.h" 9 10 #include "SkCanvas.h" 11 12 namespace sksg { 13 14 MaskEffect::MaskEffect(sk_sp<RenderNode> child, sk_sp<RenderNode> mask) 15 : INHERITED(std::move(child)) 16 , fMaskNode(std::move(mask)) { 17 this->observeInval(fMaskNode); 18 } 19 20 MaskEffect::~MaskEffect() { 21 this->unobserveInval(fMaskNode); 22 } 23 24 void MaskEffect::onRender(SkCanvas* canvas) const { 25 if (this->bounds().isEmpty()) 26 return; 27 28 SkAutoCanvasRestore acr(canvas, false); 29 30 canvas->saveLayer(this->bounds(), nullptr); 31 fMaskNode->render(canvas); 32 33 34 SkPaint p; 35 p.setBlendMode(SkBlendMode::kSrcIn); 36 canvas->saveLayer(this->bounds(), &p); 37 38 this->INHERITED::onRender(canvas); 39 } 40 41 42 SkRect MaskEffect::onRevalidate(InvalidationController* ic, const SkMatrix& ctm) { 43 SkASSERT(this->hasInval()); 44 45 const auto maskBounds = fMaskNode->revalidate(ic, ctm); 46 auto childBounds = this->INHERITED::onRevalidate(ic, ctm); 47 48 return childBounds.intersect(maskBounds) ? childBounds : SkRect::MakeEmpty(); 49 } 50 51 } // namespace sksg 52
