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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/paint_preview/browser/compositor_utils.h"
#include <utility>
#include "base/functional/bind.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/thread_pool.h"
#include "build/build_config.h"
#include "components/discardable_memory/service/discardable_shared_memory_manager.h"
#include "components/paint_preview/browser/paint_preview_compositor_service_impl.h"
#include "components/services/paint_preview_compositor/public/mojom/paint_preview_compositor.mojom.h"
#include "components/strings/grit/components_strings.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "content/public/browser/service_process_host.h"
#include "mojo/public/cpp/bindings/remote.h"
namespace paint_preview {
namespace {
void BindDiscardableSharedMemoryManagerOnIOThread(
mojo::PendingReceiver<
discardable_memory::mojom::DiscardableSharedMemoryManager> receiver) {
DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
discardable_memory::DiscardableSharedMemoryManager::Get()->Bind(
std::move(receiver));
}
} // namespace
std::unique_ptr<PaintPreviewCompositorService, base::OnTaskRunnerDeleter>
StartCompositorService(base::OnceClosure disconnect_handler) {
// Create a dedicated sequence for communicating with the compositor. This
// sequence will handle message serialization/deserialization of bitmaps so it
// affects user visible elements. This is an implementation detail and the
// caller should continue to communicate with the compositor via the sequence
// that called this.
auto compositor_task_runner = base::ThreadPool::CreateSequencedTaskRunner(
{base::TaskPriority::USER_VISIBLE,
base::ThreadPolicy::MUST_USE_FOREGROUND});
// The discardable memory manager isn't initialized here. This is handled in
// the constructor of PaintPreviewCompositorServiceImpl once the pending
// remote becomes bound.
mojo::PendingRemote<mojom::PaintPreviewCompositorCollection> pending_remote;
compositor_task_runner->PostTask(
FROM_HERE,
base::BindOnce(&CreateCompositorCollectionPending,
pending_remote.InitWithNewPipeAndPassReceiver()));
return std::unique_ptr<PaintPreviewCompositorServiceImpl,
base::OnTaskRunnerDeleter>(
new PaintPreviewCompositorServiceImpl(std::move(pending_remote),
compositor_task_runner,
std::move(disconnect_handler)),
base::OnTaskRunnerDeleter(
base::SequencedTaskRunner::GetCurrentDefault()));
}
mojo::Remote<mojom::PaintPreviewCompositorCollection>
CreateCompositorCollection() {
mojo::Remote<mojom::PaintPreviewCompositorCollection> collection;
CreateCompositorCollectionPending(collection.BindNewPipeAndPassReceiver());
BindDiscardableSharedMemoryManager(&collection);
return collection;
}
void CreateCompositorCollectionPending(
mojo::PendingReceiver<mojom::PaintPreviewCompositorCollection> collection) {
content::ServiceProcessHost::Launch<mojom::PaintPreviewCompositorCollection>(
std::move(collection),
content::ServiceProcessHost::Options()
.WithDisplayName(IDS_PAINT_PREVIEW_COMPOSITOR_SERVICE_DISPLAY_NAME)
.Pass());
}
void BindDiscardableSharedMemoryManager(
mojo::Remote<mojom::PaintPreviewCompositorCollection>* collection) {
mojo::PendingRemote<discardable_memory::mojom::DiscardableSharedMemoryManager>
discardable_memory_manager;
// Set up the discardable memory manager.
content::GetIOThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(
&BindDiscardableSharedMemoryManagerOnIOThread,
discardable_memory_manager.InitWithNewPipeAndPassReceiver()));
collection->get()->SetDiscardableSharedMemoryManager(
std::move(discardable_memory_manager));
}
} // namespace paint_preview
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