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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.
78 lines
2.4 KiB
C++
78 lines
2.4 KiB
C++
// Copyright 2016 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/content_handler/rasterizer.h"
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#include <utility>
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#include "apps/mozart/lib/skia/skia_vmo_surface.h"
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#include "lib/ftl/logging.h"
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#include "third_party/skia/include/core/SkCanvas.h"
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namespace flutter_runner {
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Rasterizer::Rasterizer() {}
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Rasterizer::~Rasterizer() {}
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void Rasterizer::SetScene(fidl::InterfaceHandle<mozart::Scene> scene) {
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scene_.Bind(std::move(scene));
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buffer_producer_.reset(new mozart::BufferProducer());
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}
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void Rasterizer::Draw(std::unique_ptr<flow::LayerTree> layer_tree,
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ftl::Closure callback) {
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FTL_DCHECK(layer_tree);
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if (!scene_) {
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callback();
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return;
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}
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const SkISize& frame_size = layer_tree->frame_size();
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auto update = mozart::SceneUpdate::New();
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// TODO(abarth): Support incremental updates.
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update->clear_resources = true;
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update->clear_nodes = true;
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if (frame_size.isEmpty()) {
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update->nodes.insert(mozart::kSceneRootNodeId, mozart::Node::New());
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// Publish the updated scene contents.
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// TODO(jeffbrown): We should set the metadata's presentation_time here too.
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scene_->Update(std::move(update));
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auto metadata = mozart::SceneMetadata::New();
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metadata->version = layer_tree->scene_version();
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scene_->Publish(std::move(metadata));
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callback();
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return;
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}
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flow::CompositorContext::ScopedFrame frame =
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compositor_context_.AcquireFrame(nullptr, nullptr);
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layer_tree->Preroll(frame);
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flow::SceneUpdateContext context(update.get(), buffer_producer_.get());
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auto root_node = mozart::Node::New();
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layer_tree->UpdateScene(context, root_node.get());
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update->nodes.insert(mozart::kSceneRootNodeId, std::move(root_node));
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// Publish the updated scene contents.
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// TODO(jeffbrown): We should set the metadata's presentation_time here too.
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scene_->Update(std::move(update));
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auto metadata = mozart::SceneMetadata::New();
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metadata->version = layer_tree->scene_version();
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scene_->Publish(std::move(metadata));
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// Draw the contents of the scene to a surface.
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// We do this after publishing to take advantage of pipelining.
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// The image buffer's fence is signalled automatically when the surface
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// goes out of scope.
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context.ExecutePaintTasks(frame);
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callback();
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}
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} // namespace flutter_runner
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