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/*
* 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 "SkSGOpacityEffect.h"
#include "SkCanvas.h"
#include <math.h>
namespace sksg {
OpacityEffect::OpacityEffect(sk_sp<RenderNode> child, float opacity)
: INHERITED(std::move(child))
, fOpacity(opacity) {}
void OpacityEffect::onRender(SkCanvas* canvas) const {
// opacity <= 0 disables rendering
if (fOpacity <= 0)
return;
// TODO: we could avoid savelayer if there is no more than one drawing primitive
// in the sub-DAG.
SkAutoCanvasRestore acr(canvas, false);
if (fOpacity < 1) {
canvas->saveLayerAlpha(&this->bounds(), roundf(fOpacity * 255));
}
this->INHERITED::onRender(canvas);
}
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
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