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// Copyright 2020 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/paint_preview_compositor_service_impl.h"
#include "base/functional/callback.h"
#include "base/task/bind_post_task.h"
#include "base/task/sequenced_task_runner.h"
#include "components/paint_preview/browser/compositor_utils.h"
#include "components/paint_preview/browser/paint_preview_compositor_client_impl.h"
#include "components/paint_preview/public/paint_preview_compositor_client.h"
namespace paint_preview {
PaintPreviewCompositorServiceImpl::PaintPreviewCompositorServiceImpl(
mojo::PendingRemote<mojom::PaintPreviewCompositorCollection> pending_remote,
scoped_refptr<base::SequencedTaskRunner> compositor_task_runner_,
base::OnceClosure disconnect_handler)
: default_task_runner_(base::SequencedTaskRunner::GetCurrentDefault()),
compositor_task_runner_(compositor_task_runner_),
compositor_service_(
new mojo::Remote<mojom::PaintPreviewCompositorCollection>(),
base::OnTaskRunnerDeleter(compositor_task_runner_)),
user_disconnect_closure_(std::move(disconnect_handler)) {
compositor_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(
[](mojo::Remote<mojom::PaintPreviewCompositorCollection>* remote,
mojo::PendingRemote<mojom::PaintPreviewCompositorCollection>
pending,
base::OnceClosure disconnect_closure) {
remote->Bind(std::move(pending));
BindDiscardableSharedMemoryManager(remote);
remote->set_disconnect_handler(std::move(disconnect_closure));
},
compositor_service_.get(), std::move(pending_remote),
base::BindPostTask(
default_task_runner_,
base::BindOnce(
&PaintPreviewCompositorServiceImpl::DisconnectHandler,
weak_ptr_factory_.GetWeakPtr()))));
}
// The destructor for the |compositor_service_| will automatically result in any
// active compositors being killed.
PaintPreviewCompositorServiceImpl::~PaintPreviewCompositorServiceImpl() {
DCHECK(default_task_runner_->RunsTasksInCurrentSequence());
}
std::unique_ptr<PaintPreviewCompositorClient, base::OnTaskRunnerDeleter>
PaintPreviewCompositorServiceImpl::CreateCompositor(
base::OnceClosure connected_closure) {
DCHECK(default_task_runner_->RunsTasksInCurrentSequence());
std::unique_ptr<PaintPreviewCompositorClientImpl, base::OnTaskRunnerDeleter>
compositor(new PaintPreviewCompositorClientImpl(
compositor_task_runner_, weak_ptr_factory_.GetWeakPtr()),
base::OnTaskRunnerDeleter(
base::SequencedTaskRunner::GetCurrentDefault()));
compositor_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(
[](mojo::Remote<mojom::PaintPreviewCompositorCollection>* remote,
mojo::Remote<mojom::PaintPreviewCompositor>* compositor,
base::OnceCallback<void(const base::UnguessableToken&)>
on_connected) {
// This binds the remote in compositor to the
// |compositor_task_runner_|.
remote->get()->CreateCompositor(
compositor->BindNewPipeAndPassReceiver(),
std::move(on_connected));
},
// These are both deleted on `compositor_task_runner_` using
// TaskRunnerDeleter and at this point neither can be scheduled for
// deletion so passing raw pointers is safe.
compositor_service_.get(), compositor->GetCompositor(),
// This builder ensures the callback it returns is called on the
// correct sequence.
compositor->BuildCompositorCreatedCallback(
std::move(connected_closure),
base::BindOnce(
&PaintPreviewCompositorServiceImpl::OnCompositorCreated,
weak_ptr_factory_.GetWeakPtr()))));
return compositor;
}
void PaintPreviewCompositorServiceImpl::OnMemoryPressure(
base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level) {
DCHECK(default_task_runner_->RunsTasksInCurrentSequence());
compositor_task_runner_->PostTask(
FROM_HERE,
base::BindOnce(
[](mojo::Remote<mojom::PaintPreviewCompositorCollection>* remote,
base::MemoryPressureListener::MemoryPressureLevel
memory_pressure_level) {
if (!remote->is_bound()) {
return;
}
remote->get()->OnMemoryPressure(memory_pressure_level);
},
// `compositor_service_` is only deleted on `compositor_task_runner_`
// using TaskRunnerDeleter. Since the parent object is alive at this
// point passing a pointer is safe.
compositor_service_.get(), memory_pressure_level));
}
bool PaintPreviewCompositorServiceImpl::HasActiveClients() const {
DCHECK(default_task_runner_->RunsTasksInCurrentSequence());
return !active_clients_.empty();
}
void PaintPreviewCompositorServiceImpl::SetDisconnectHandler(
base::OnceClosure disconnect_handler) {
DCHECK(default_task_runner_->RunsTasksInCurrentSequence());
user_disconnect_closure_ = std::move(disconnect_handler);
}
void PaintPreviewCompositorServiceImpl::MarkCompositorAsDeleted(
const base::UnguessableToken& token) {
DCHECK(default_task_runner_->RunsTasksInCurrentSequence());
active_clients_.erase(token);
}
const base::flat_set<base::UnguessableToken>&
PaintPreviewCompositorServiceImpl::ActiveClientsForTesting() const {
DCHECK(default_task_runner_->RunsTasksInCurrentSequence());
return active_clients_;
}
void PaintPreviewCompositorServiceImpl::OnCompositorCreated(
const base::UnguessableToken& token) {
DCHECK(default_task_runner_->RunsTasksInCurrentSequence());
active_clients_.insert(token);
}
void PaintPreviewCompositorServiceImpl::DisconnectHandler() {
DCHECK(default_task_runner_->RunsTasksInCurrentSequence());
if (user_disconnect_closure_)
std::move(user_disconnect_closure_).Run();
// Don't call `compositor_service_.reset()` so the remote stays bound and ptrs
// to it in callbacks remain valid. Disconnect calls will just drop silently.
}
} // namespace paint_preview
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