| /* |
| * 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 "SkSGMaskEffect.h" |
| |
| #include "SkCanvas.h" |
| |
| namespace sksg { |
| |
| MaskEffect::MaskEffect(sk_sp<RenderNode> child, sk_sp<RenderNode> mask, Mode mode) |
| : INHERITED(std::move(child)) |
| , fMaskNode(std::move(mask)) |
| , fMaskMode(mode) { |
| this->observeInval(fMaskNode); |
| } |
| |
| MaskEffect::~MaskEffect() { |
| this->unobserveInval(fMaskNode); |
| } |
| |
| void MaskEffect::onRender(SkCanvas* canvas, const RenderContext* ctx) const { |
| if (this->bounds().isEmpty()) |
| return; |
| |
| SkAutoCanvasRestore acr(canvas, false); |
| |
| canvas->saveLayer(this->bounds(), nullptr); |
| // Note: the paint overrides in ctx don't apply to the mask. |
| fMaskNode->render(canvas); |
| |
| SkPaint p; |
| p.setBlendMode(fMaskMode == Mode::kNormal ? SkBlendMode::kSrcIn : SkBlendMode::kSrcOut); |
| canvas->saveLayer(this->bounds(), &p); |
| |
| this->INHERITED::onRender(canvas, ctx); |
| } |
| |
| const RenderNode* MaskEffect::onNodeAt(const SkPoint& p) const { |
| const auto mask_hit = (!!fMaskNode->nodeAt(p) == (fMaskMode == Mode::kNormal)); |
| |
| return mask_hit ? this->INHERITED::onNodeAt(p) : nullptr; |
| } |
| |
| SkRect MaskEffect::onRevalidate(InvalidationController* ic, const SkMatrix& ctm) { |
| SkASSERT(this->hasInval()); |
| |
| const auto maskBounds = fMaskNode->revalidate(ic, ctm); |
| auto childBounds = this->INHERITED::onRevalidate(ic, ctm); |
| |
| return (fMaskMode == Mode::kInvert || childBounds.intersect(maskBounds)) |
| ? childBounds |
| : SkRect::MakeEmpty(); |
| } |
| |
| } // namespace sksg |