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Diffstat (limited to 'experimental/sksg/effects/SkSGClipEffect.cpp')
-rw-r--r-- | experimental/sksg/effects/SkSGClipEffect.cpp | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/experimental/sksg/effects/SkSGClipEffect.cpp b/experimental/sksg/effects/SkSGClipEffect.cpp new file mode 100644 index 0000000000..b2d68fc8cf --- /dev/null +++ b/experimental/sksg/effects/SkSGClipEffect.cpp @@ -0,0 +1,50 @@ +/* + * 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 "SkSGClipEffect.h" + +#include "SkCanvas.h" +#include "SkPath.h" +#include "SkSGGeometryNode.h" + +namespace sksg { + +ClipEffect::ClipEffect(sk_sp<RenderNode> child, sk_sp<GeometryNode> clip, bool aa) + : INHERITED(std::move(child)) + , fClipNode(std::move(clip)) + , fAntiAlias(aa) { + this->observeInval(fClipNode); +} + +ClipEffect::~ClipEffect() { + this->unobserveInval(fClipNode); +} + +void ClipEffect::onRender(SkCanvas* canvas) const { + if (this->bounds().isEmpty()) + return; + + SkAutoCanvasRestore acr(canvas, !fNoop); + if (!fNoop) { + fClipNode->clip(canvas, fAntiAlias); + } + + this->INHERITED::onRender(canvas); +} + +SkRect ClipEffect::onRevalidate(InvalidationController* ic, const SkMatrix& ctm) { + SkASSERT(this->hasInval()); + + const auto clipBounds = fClipNode->revalidate(ic, ctm); + auto childBounds = this->INHERITED::onRevalidate(ic, ctm); + + fNoop = fClipNode->asPath().conservativelyContainsRect(childBounds); + + return childBounds.intersect(clipBounds) ? childBounds : SkRect::MakeEmpty(); +} + +} // namespace sksg |