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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/accessibility/render_accessibility_host.h"
#include <atomic>
#include <memory>
#include "base/functional/bind.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/thread_pool.h"
#include "content/browser/renderer_host/render_frame_host_impl.h"
#include "content/public/browser/browser_thread.h"
#include "mojo/public/cpp/bindings/message.h"
namespace content {
namespace {
// True if inbound accessibility calls are to be ignored.
std::atomic_bool g_renderer_serialization_experiment_enabled{false};
base::RepeatingClosure& GetOnAccessibilityDataDiscardedCallback() {
static base::NoDestructor<base::RepeatingClosure> test_callback;
return *test_callback;
}
} // namespace
RenderAccessibilityHost::RenderAccessibilityHost(
base::WeakPtr<RenderFrameHostImpl> render_frame_host_impl,
ui::AXTreeID tree_id)
: render_frame_host_impl_(std::move(render_frame_host_impl)),
tree_id_(tree_id) {}
RenderAccessibilityHost::~RenderAccessibilityHost() = default;
// static
void RenderAccessibilityHost::SetRendererSerializationExperimentEnabled(
bool enabled) {
g_renderer_serialization_experiment_enabled.store(enabled,
std::memory_order_relaxed);
}
// static
void RenderAccessibilityHost::SetAccessibilityDataDiscardedCallbackForTesting(
base::RepeatingClosure closure) {
GetOnAccessibilityDataDiscardedCallback() = std::move(closure);
}
void RenderAccessibilityHost::HandleAXEvents(
const ui::AXUpdatesAndEvents& updates_and_events,
const ui::AXLocationAndScrollUpdates& location_and_scroll_updates,
uint32_t reset_token,
HandleAXEventsCallback callback) {
NOTREACHED() << "Non-const ref version of this method should be used as a "
"performance optimization.";
}
void RenderAccessibilityHost::HandleAXEvents(
ui::AXUpdatesAndEvents& updates_and_events,
ui::AXLocationAndScrollUpdates& location_and_scroll_updates,
uint32_t reset_token,
HandleAXEventsCallback callback) {
if (g_renderer_serialization_experiment_enabled.load(
std::memory_order_relaxed)) {
std::move(callback).Run();
if (GetOnAccessibilityDataDiscardedCallback()) {
GetOnAccessibilityDataDiscardedCallback().Run();
}
return;
}
// Post the HandleAXEvents task onto the UI thread, and then when that
// finishes, post back the response callback onto this runner (to satisfy
// the mojo contract).
GetUIThreadTaskRunner({})->PostTaskAndReply(
FROM_HERE,
base::BindOnce(&RenderFrameHostImpl::HandleAXEvents,
render_frame_host_impl_, tree_id_,
std::move(updates_and_events),
std::move(location_and_scroll_updates), reset_token,
mojo::GetBadMessageCallback()),
std::move(callback));
}
void RenderAccessibilityHost::HandleAXLocationChanges(
const ui::AXLocationAndScrollUpdates& changes,
uint32_t reset_token) {
NOTREACHED() << "Non-const ref version of this method should be used as a "
"performance optimization.";
}
void RenderAccessibilityHost::HandleAXLocationChanges(
ui::AXLocationAndScrollUpdates& changes,
uint32_t reset_token) {
if (g_renderer_serialization_experiment_enabled.load(
std::memory_order_relaxed)) {
return;
}
GetUIThreadTaskRunner({})->PostTask(
FROM_HERE,
base::BindOnce(&RenderFrameHostImpl::HandleAXLocationChanges,
render_frame_host_impl_, tree_id_, std::move(changes),
reset_token, mojo::GetBadMessageCallback()));
}
} // namespace content
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