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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 "ui/aura/native_window_occlusion_tracker.h"
#include "base/metrics/field_trial_params.h"
#include "build/build_config.h"
#include "ui/aura/window_tree_host.h"
#include "ui/base/ui_base_features.h"
#if BUILDFLAG(IS_WIN)
#include "ui/aura/native_window_occlusion_tracker_win.h"
#endif // BUILDFLAG(IS_WIN)
namespace aura {
// static
void NativeWindowOcclusionTracker::EnableNativeWindowOcclusionTracking(
WindowTreeHost* host) {
#if BUILDFLAG(IS_WIN)
if (host->IsNativeWindowOcclusionEnabled()) {
NativeWindowOcclusionTrackerWin::GetOrCreateInstance()->Enable(
host->window());
}
#endif // BUILDFLAG(IS_WIN)
}
// static
void NativeWindowOcclusionTracker::DisableNativeWindowOcclusionTracking(
WindowTreeHost* host) {
#if BUILDFLAG(IS_WIN)
if (host->IsNativeWindowOcclusionEnabled()) {
host->SetNativeWindowOcclusionState(Window::OcclusionState::UNKNOWN, {});
host->set_on_current_workspace(std::nullopt);
NativeWindowOcclusionTrackerWin::GetOrCreateInstance()->Disable(
host->window());
}
#endif // BUILDFLAG(IS_WIN)
}
// static
bool NativeWindowOcclusionTracker::IsNativeWindowOcclusionTrackingAlwaysEnabled(
WindowTreeHost* host) {
#if BUILDFLAG(IS_WIN)
// chromedriver uses the environment variable CHROME_HEADLESS. In this case it
// expected that native occlusion is not applied. CHROME_HEADLESS is also used
// by tests, but often we want native occlusion enabled, e.g. in performance
// tests. So, we do not perform the headless check if
// kAlwaysTrackNativeWindowOcclusionForTest is specified.
// TODO(crbug.com/333426475): Remove kAlwaysTrackNativeWindowOcclusionForTest
// after removing usage of CHROME_HEADLESS from tests.
static bool is_headless = getenv("CHROME_HEADLESS") != nullptr;
if ((is_headless &&
!base::FeatureList::IsEnabled(
features::kAlwaysTrackNativeWindowOcclusionForTest)) ||
!host->IsNativeWindowOcclusionEnabled() ||
!base::FeatureList::IsEnabled(
features::kApplyNativeOcclusionToCompositor)) {
return false;
}
if (!base::FeatureList::IsEnabled(features::kCalculateNativeWinOcclusion)) {
return false;
}
const std::string type =
features::kApplyNativeOcclusionToCompositorType.Get();
return type == features::kApplyNativeOcclusionToCompositorTypeRelease ||
type == features::kApplyNativeOcclusionToCompositorTypeThrottle ||
type ==
features::kApplyNativeOcclusionToCompositorTypeThrottleAndRelease;
#else
return false;
#endif // BUILDFLAG(IS_WIN)
}
} // namespace aura
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