blob: 513909f6e67585af600b6f84f541718297e13f6b [file] [log] [blame]
/*
* 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 "modules/sksg/include/SkSGOpacityEffect.h"
namespace sksg {
OpacityEffect::OpacityEffect(sk_sp<RenderNode> child, float opacity)
: INHERITED(std::move(child))
, fOpacity(opacity) {}
void OpacityEffect::onRender(SkCanvas* canvas, const RenderContext* ctx) const {
// opacity <= 0 disables rendering
if (fOpacity <= 0)
return;
// opacity >= 1 has no effect
if (fOpacity >= 1) {
this->INHERITED::onRender(canvas, ctx);
return;
}
const auto local_context = ScopedRenderContext(canvas, ctx).modulateOpacity(fOpacity);
this->INHERITED::onRender(canvas, local_context);
}
const RenderNode* OpacityEffect::onNodeAt(const SkPoint& p) const {
return (fOpacity > 0) ? this->INHERITED::onNodeAt(p) : nullptr;
}
SkRect OpacityEffect::onRevalidate(InvalidationController* ic, const SkMatrix& ctm) {
SkASSERT(this->hasInval());
// opacity <= 0 disables rendering AND revalidation for the sub-DAG
return fOpacity > 0 ? this->INHERITED::onRevalidate(ic, ctm) : SkRect::MakeEmpty();
}
} // namespace sksg