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/SkSGClipEffect.h"
9
10 #include "include/core/SkCanvas.h"
11 #include "include/core/SkPath.h"
12 #include "include/private/base/SkAssert.h"
13 #include "modules/sksg/include/SkSGGeometryNode.h"
14 #include "modules/sksg/include/SkSGNode.h"
15
16 class SkMatrix;
17 struct SkPoint;
18
19 namespace sksg {
20 class InvalidationController;
21
ClipEffect(sk_sp<RenderNode> child,sk_sp<GeometryNode> clip,bool aa,bool force_clip)22 ClipEffect::ClipEffect(sk_sp<RenderNode> child, sk_sp<GeometryNode> clip, bool aa, bool force_clip)
23 : INHERITED(std::move(child))
24 , fClipNode(std::move(clip))
25 , fAntiAlias(aa)
26 , fForceClip(force_clip) {
27 this->observeInval(fClipNode);
28 }
29
~ClipEffect()30 ClipEffect::~ClipEffect() {
31 this->unobserveInval(fClipNode);
32 }
33
onRender(SkCanvas * canvas,const RenderContext * ctx) const34 void ClipEffect::onRender(SkCanvas* canvas, const RenderContext* ctx) const {
35 SkAutoCanvasRestore acr(canvas, !fNoop);
36 if (!fNoop) {
37 fClipNode->clip(canvas, fAntiAlias);
38 }
39
40 this->INHERITED::onRender(canvas, ctx);
41 }
42
onNodeAt(const SkPoint & p) const43 const RenderNode* ClipEffect::onNodeAt(const SkPoint& p) const {
44 return fClipNode->contains(p) ? this->INHERITED::onNodeAt(p) : nullptr;
45 }
46
onRevalidate(InvalidationController * ic,const SkMatrix & ctm)47 SkRect ClipEffect::onRevalidate(InvalidationController* ic, const SkMatrix& ctm) {
48 SkASSERT(this->hasInval());
49
50 const auto clipBounds = fClipNode->revalidate(ic, ctm);
51 auto childBounds = this->INHERITED::onRevalidate(ic, ctm);
52
53 // When the child node is fully contained within the clip, it is usually safe to elide.
54 // An exception is clip-dependent sizing for saveLayer buffers, where the clip is always
55 // significant. For those cases, we provide a mechanism to disable elision.
56 fNoop = !fForceClip && fClipNode->asPath().conservativelyContainsRect(childBounds);
57
58 return childBounds.intersect(clipBounds) ? childBounds : SkRect::MakeEmpty();
59 }
60
61 } // namespace sksg
62