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 "modules/sksg/include/SkSGOpacityEffect.h"
9
10namespace sksg {
11
12OpacityEffect::OpacityEffect(sk_sp<RenderNode> child, float opacity)
13 : INHERITED(std::move(child))
14 , fOpacity(opacity) {}
15
16void 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
26const RenderNode* OpacityEffect::onNodeAt(const SkPoint& p) const {
27 return (fOpacity > 0) ? this->INHERITED::onNodeAt(p) : nullptr;
28}
29
30SkRect OpacityEffect::onRevalidate(InvalidationController* ic, const SkMatrix& ctm) {
31 SkASSERT(this->hasInval());
32
33 // opacity <= 0 disables rendering AND revalidation for the sub-DAG
34 return fOpacity > 0 ? this->INHERITED::onRevalidate(ic, ctm) : SkRect::MakeEmpty();
35}
36
37} // namespace sksg
38