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21f6aa5270
We push a bit up the tree during preroll to learn whether there system composited layers below each layer. During update scene, we squash down to paint tasks, which we execute after publishing the new scene.
60 lines
1.8 KiB
C++
60 lines
1.8 KiB
C++
// Copyright 2015 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "flutter/flow/layers/layer_tree.h"
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#include "flutter/flow/layers/layer.h"
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#include "flutter/glue/trace_event.h"
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namespace flow {
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LayerTree::LayerTree()
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: frame_size_{},
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scene_version_(0),
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rasterizer_tracing_threshold_(0),
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checkerboard_raster_cache_images_(false) {}
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LayerTree::~LayerTree() {}
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void LayerTree::Raster(CompositorContext::ScopedFrame& frame,
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bool ignore_raster_cache) {
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Preroll(frame, ignore_raster_cache);
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Paint(frame);
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}
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void LayerTree::Preroll(CompositorContext::ScopedFrame& frame,
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bool ignore_raster_cache) {
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TRACE_EVENT0("flutter", "LayerTree::Preroll");
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frame.context().raster_cache().SetCheckboardCacheImages(
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checkerboard_raster_cache_images_);
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Layer::PrerollContext context = {
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ignore_raster_cache ? nullptr : &frame.context().raster_cache(),
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frame.gr_context(), SkRect::MakeEmpty(),
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};
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root_layer_->Preroll(&context, SkMatrix::I());
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}
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#if defined(OS_FUCHSIA)
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void LayerTree::UpdateScene(SceneUpdateContext& context,
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mozart::Node* container) {
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TRACE_EVENT0("flutter", "LayerTree::UpdateScene");
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if (root_layer_->needs_system_composite()) {
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root_layer_->UpdateScene(context, container);
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} else {
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context.AddLayerToCurrentPaintTask(root_layer_.get());
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}
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context.FinalizeCurrentPaintTaskIfNeeded(container, SkMatrix::I());
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}
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#endif
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void LayerTree::Paint(CompositorContext::ScopedFrame& frame) {
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Layer::PaintContext context = {frame.canvas(), frame.context().frame_time(),
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frame.context().engine_time()};
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TRACE_EVENT0("flutter", "LayerTree::Paint");
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root_layer_->Paint(context);
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}
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} // namespace flow
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