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// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/views/widget/desktop_aura/desktop_screen.h"
#include "base/notreached.h"
#if defined(USE_X11)
#include "ui/views/widget/desktop_aura/desktop_screen_x11.h"
#endif
#if defined(USE_OZONE)
#include "ui/base/ui_base_features.h"
#include "ui/ozone/public/platform_screen.h"
#include "ui/views/linux_ui/device_scale_factor_observer.h"
#include "ui/views/linux_ui/linux_ui.h"
#include "ui/views/widget/desktop_aura/desktop_screen_ozone.h"
#endif
namespace views {
#if defined(USE_OZONE)
// Listens to device scale factor changes that can be provided via "external" to
// Ozone sources such as toolkits, etc, and provides Ozone with new values.
class DesktopScreenOzoneLinux : public DesktopScreenOzone,
public DeviceScaleFactorObserver {
public:
DesktopScreenOzoneLinux() {
auto* linux_ui = LinuxUI::instance();
if (linux_ui) {
display_scale_factor_observer_.Observe(linux_ui);
// Send current scale factor as starting to observe doesn't actually
// result in getting a OnDeviceScaleFactorChanged call.
SetDeviceScaleFactorToPlatformScreen(linux_ui->GetDeviceScaleFactor());
}
}
~DesktopScreenOzoneLinux() override = default;
private:
// DeviceScaleFactorObserver:
void OnDeviceScaleFactorChanged() override {
SetDeviceScaleFactorToPlatformScreen(
LinuxUI::instance()->GetDeviceScaleFactor());
}
void SetDeviceScaleFactorToPlatformScreen(float scale_factor) {
platform_screen()->SetDeviceScaleFactor(scale_factor);
}
base::ScopedObservation<LinuxUI,
DeviceScaleFactorObserver,
&LinuxUI::AddDeviceScaleFactorObserver,
&LinuxUI::RemoveDeviceScaleFactorObserver>
display_scale_factor_observer_{this};
};
#endif
std::unique_ptr<display::Screen> CreateDesktopScreen() {
#if defined(USE_OZONE)
if (features::IsUsingOzonePlatform())
return std::make_unique<DesktopScreenOzoneLinux>();
#endif
#if defined(USE_X11)
auto screen = std::make_unique<DesktopScreenX11>();
screen->Init();
return screen;
#else
NOTREACHED();
return nullptr;
#endif
}
} // namespace views
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