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 "SkSGMaskEffect.h"
9
10 #include "SkCanvas.h"
11
12 namespace sksg {
13
MaskEffect(sk_sp<RenderNode> child,sk_sp<RenderNode> mask,Mode mode)14 MaskEffect::MaskEffect(sk_sp<RenderNode> child, sk_sp<RenderNode> mask, Mode mode)
15 : INHERITED(std::move(child))
16 , fMaskNode(std::move(mask))
17 , fMaskMode(mode) {
18 this->observeInval(fMaskNode);
19 }
20
~MaskEffect()21 MaskEffect::~MaskEffect() {
22 this->unobserveInval(fMaskNode);
23 }
24
onRender(SkCanvas * canvas,const RenderContext * ctx) const25 void MaskEffect::onRender(SkCanvas* canvas, const RenderContext* ctx) const {
26 if (this->bounds().isEmpty())
27 return;
28
29 SkAutoCanvasRestore acr(canvas, false);
30
31 canvas->saveLayer(this->bounds(), nullptr);
32 // Note: the paint overrides in ctx don't apply to the mask.
33 fMaskNode->render(canvas);
34
35
36 SkPaint p;
37 p.setBlendMode(fMaskMode == Mode::kNormal ? SkBlendMode::kSrcIn : SkBlendMode::kSrcOut);
38 canvas->saveLayer(this->bounds(), &p);
39
40 this->INHERITED::onRender(canvas, ctx);
41 }
42
43
onRevalidate(InvalidationController * ic,const SkMatrix & ctm)44 SkRect MaskEffect::onRevalidate(InvalidationController* ic, const SkMatrix& ctm) {
45 SkASSERT(this->hasInval());
46
47 const auto maskBounds = fMaskNode->revalidate(ic, ctm);
48 auto childBounds = this->INHERITED::onRevalidate(ic, ctm);
49
50 return (fMaskMode == Mode::kInvert || childBounds.intersect(maskBounds))
51 ? childBounds
52 : SkRect::MakeEmpty();
53 }
54
55 } // namespace sksg
56