| // 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/child_scene_layer.h" |
| |
| namespace flutter { |
| |
| ChildSceneLayer::ChildSceneLayer(zx_koid_t layer_id, |
| const SkPoint& offset, |
| const SkSize& size, |
| bool hit_testable) |
| : layer_id_(layer_id), |
| offset_(offset), |
| size_(size), |
| hit_testable_(hit_testable) {} |
| |
| void ChildSceneLayer::Preroll(PrerollContext* context, const SkMatrix& matrix) { |
| TRACE_EVENT0("flutter", "ChildSceneLayer::Preroll"); |
| |
| context->child_scene_layer_exists_below = true; |
| CheckForChildLayerBelow(context); |
| |
| // An alpha "hole punch" is required if the frame behind us is not opaque. |
| if (!context->is_opaque) { |
| set_paint_bounds( |
| SkRect::MakeXYWH(offset_.fX, offset_.fY, size_.fWidth, size_.fHeight)); |
| } |
| } |
| |
| void ChildSceneLayer::Paint(PaintContext& context) const { |
| TRACE_EVENT0("flutter", "ChildSceneLayer::Paint"); |
| FML_DCHECK(needs_painting()); |
| FML_DCHECK(needs_system_composite()); |
| |
| // If we are being rendered into our own frame using the system compositor, |
| // then it is neccesary to "punch a hole" in the canvas/frame behind us so |
| // that group opacity looks correct. |
| SkPaint paint; |
| paint.setColor(SK_ColorTRANSPARENT); |
| paint.setBlendMode(SkBlendMode::kSrc); |
| context.leaf_nodes_canvas->drawRect(paint_bounds(), paint); |
| } |
| |
| void ChildSceneLayer::UpdateScene(SceneUpdateContext& context) { |
| TRACE_EVENT0("flutter", "ChildSceneLayer::UpdateScene"); |
| FML_DCHECK(needs_system_composite()); |
| context.UpdateView(layer_id_, offset_, size_, hit_testable_); |
| } |
| |
| } // namespace flutter |