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 "SkSGOpacityEffect.h"
9
10 namespace sksg {
11
OpacityEffect(sk_sp<RenderNode> child,float opacity)12 OpacityEffect::OpacityEffect(sk_sp<RenderNode> child, float opacity)
13 : INHERITED(std::move(child))
14 , fOpacity(opacity) {}
15
onRender(SkCanvas * canvas,const RenderContext * ctx) const16 void OpacityEffect::onRender(SkCanvas* canvas, const RenderContext* ctx) const {
17 // opacity <= 0 disables rendering
18 if (fOpacity <= 0)
19 return;
20
21 const auto local_context = ScopedRenderContext(canvas, ctx).modulateOpacity(fOpacity);
22
23 this->INHERITED::onRender(canvas, local_context);
24 }
25
onRevalidate(InvalidationController * ic,const SkMatrix & ctm)26 SkRect OpacityEffect::onRevalidate(InvalidationController* ic, const SkMatrix& ctm) {
27 SkASSERT(this->hasInval());
28
29 // opacity <= 0 disables rendering AND revalidation for the sub-DAG
30 return fOpacity > 0 ? this->INHERITED::onRevalidate(ic, ctm) : SkRect::MakeEmpty();
31 }
32
33 } // namespace sksg
34