| // Copyright 2013 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "flutter/flow/layers/shader_mask_layer.h" |
| |
| namespace flutter { |
| |
| ShaderMaskLayer::ShaderMaskLayer(sk_sp<SkShader> shader, |
| const SkRect& mask_rect, |
| SkBlendMode blend_mode) |
| : shader_(shader), mask_rect_(mask_rect), blend_mode_(blend_mode) {} |
| |
| #ifdef FLUTTER_ENABLE_DIFF_CONTEXT |
| |
| void ShaderMaskLayer::Diff(DiffContext* context, const Layer* old_layer) { |
| DiffContext::AutoSubtreeRestore subtree(context); |
| auto* prev = static_cast<const ShaderMaskLayer*>(old_layer); |
| if (!context->IsSubtreeDirty()) { |
| FML_DCHECK(prev); |
| if (shader_ != prev->shader_ || mask_rect_ != prev->mask_rect_ || |
| blend_mode_ != prev->blend_mode_) { |
| context->MarkSubtreeDirty(context->GetOldLayerPaintRegion(old_layer)); |
| } |
| } |
| |
| DiffChildren(context, prev); |
| |
| context->SetLayerPaintRegion(this, context->CurrentSubtreeRegion()); |
| } |
| |
| #endif // FLUTTER_ENABLE_DIFF_CONTEXT |
| |
| void ShaderMaskLayer::Preroll(PrerollContext* context, const SkMatrix& matrix) { |
| #if defined(LEGACY_FUCHSIA_EMBEDDER) |
| CheckForChildLayerBelow(context); |
| #endif |
| |
| Layer::AutoPrerollSaveLayerState save = |
| Layer::AutoPrerollSaveLayerState::Create(context); |
| ContainerLayer::Preroll(context, matrix); |
| } |
| |
| void ShaderMaskLayer::Paint(PaintContext& context) const { |
| TRACE_EVENT0("flutter", "ShaderMaskLayer::Paint"); |
| FML_DCHECK(needs_painting(context)); |
| |
| Layer::AutoSaveLayer save = |
| Layer::AutoSaveLayer::Create(context, paint_bounds(), nullptr); |
| PaintChildren(context); |
| |
| SkPaint paint; |
| paint.setBlendMode(blend_mode_); |
| paint.setShader(shader_); |
| context.leaf_nodes_canvas->translate(mask_rect_.left(), mask_rect_.top()); |
| context.leaf_nodes_canvas->drawRect( |
| SkRect::MakeWH(mask_rect_.width(), mask_rect_.height()), paint); |
| } |
| |
| } // namespace flutter |