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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "ScreenHelperGTK.h"
#ifdef MOZ_X11
# include <gdk/gdkx.h>
#endif /* MOZ_X11 */
#ifdef MOZ_WAYLAND
# include <gdk/gdkwayland.h>
#endif /* MOZ_WAYLAND */
#include <dlfcn.h>
#include <gtk/gtk.h>
#include "gfxPlatformGtk.h"
#include "mozilla/dom/DOMTypes.h"
#include "mozilla/Logging.h"
#include "nsGtkUtils.h"
#include "nsTArray.h"
namespace mozilla {
namespace widget {
static LazyLogModule sScreenLog("WidgetScreen");
static void monitors_changed(GdkScreen* aScreen, gpointer aClosure) {
MOZ_LOG(sScreenLog, LogLevel::Debug, ("Received monitors-changed event"));
ScreenHelperGTK* self = static_cast<ScreenHelperGTK*>(aClosure);
self->RefreshScreens();
}
static void screen_resolution_changed(GdkScreen* aScreen, GParamSpec* aPspec,
ScreenHelperGTK* self) {
self->RefreshScreens();
}
static GdkFilterReturn root_window_event_filter(GdkXEvent* aGdkXEvent,
GdkEvent* aGdkEvent,
gpointer aClosure) {
#ifdef MOZ_X11
ScreenHelperGTK* self = static_cast<ScreenHelperGTK*>(aClosure);
XEvent* xevent = static_cast<XEvent*>(aGdkXEvent);
switch (xevent->type) {
case PropertyNotify: {
XPropertyEvent* propertyEvent = &xevent->xproperty;
if (propertyEvent->atom == self->NetWorkareaAtom()) {
MOZ_LOG(sScreenLog, LogLevel::Debug, ("Work area size changed"));
self->RefreshScreens();
}
} break;
default:
break;
}
#endif
return GDK_FILTER_CONTINUE;
}
ScreenHelperGTK::ScreenHelperGTK()
: mRootWindow(nullptr)
#ifdef MOZ_X11
,
mNetWorkareaAtom(0)
#endif
{
MOZ_LOG(sScreenLog, LogLevel::Debug, ("ScreenHelperGTK created"));
GdkScreen* defaultScreen = gdk_screen_get_default();
if (!defaultScreen) {
// Sometimes we don't initial X (e.g., xpcshell)
MOZ_LOG(sScreenLog, LogLevel::Debug,
("defaultScreen is nullptr, running headless"));
return;
}
mRootWindow = gdk_get_default_root_window();
MOZ_ASSERT(mRootWindow);
g_object_ref(mRootWindow);
// GDK_PROPERTY_CHANGE_MASK ==> PropertyChangeMask, for PropertyNotify
gdk_window_set_events(mRootWindow,
GdkEventMask(gdk_window_get_events(mRootWindow) |
GDK_PROPERTY_CHANGE_MASK));
g_signal_connect(defaultScreen, "monitors-changed",
G_CALLBACK(monitors_changed), this);
// Use _after to ensure this callback is run after gfxPlatformGtk.cpp's
// handler.
g_signal_connect_after(defaultScreen, "notify::resolution",
G_CALLBACK(screen_resolution_changed), this);
#ifdef MOZ_X11
gdk_window_add_filter(mRootWindow, root_window_event_filter, this);
if (GDK_IS_X11_DISPLAY(gdk_display_get_default())) {
mNetWorkareaAtom = XInternAtom(GDK_WINDOW_XDISPLAY(mRootWindow),
"_NET_WORKAREA", X11False);
}
#endif
RefreshScreens();
}
ScreenHelperGTK::~ScreenHelperGTK() {
if (mRootWindow) {
g_signal_handlers_disconnect_by_data(gdk_screen_get_default(), this);
gdk_window_remove_filter(mRootWindow, root_window_event_filter, this);
g_object_unref(mRootWindow);
mRootWindow = nullptr;
}
}
gint ScreenHelperGTK::GetGTKMonitorScaleFactor(gint aMonitorNum) {
// Since GDK 3.10
static auto sGdkScreenGetMonitorScaleFactorPtr =
(gint(*)(GdkScreen*, gint))dlsym(RTLD_DEFAULT,
"gdk_screen_get_monitor_scale_factor");
if (sGdkScreenGetMonitorScaleFactorPtr) {
GdkScreen* screen = gdk_screen_get_default();
return sGdkScreenGetMonitorScaleFactorPtr(screen, aMonitorNum);
}
return 1;
}
static uint32_t GetGTKPixelDepth() {
GdkVisual* visual = gdk_screen_get_system_visual(gdk_screen_get_default());
return gdk_visual_get_depth(visual);
}
static already_AddRefed<Screen> MakeScreen(GdkScreen* aScreen,
gint aMonitorNum) {
GdkRectangle monitor;
GdkRectangle workarea;
gdk_screen_get_monitor_geometry(aScreen, aMonitorNum, &monitor);
gdk_screen_get_monitor_workarea(aScreen, aMonitorNum, &workarea);
gint gdkScaleFactor = ScreenHelperGTK::GetGTKMonitorScaleFactor(aMonitorNum);
// gdk_screen_get_monitor_geometry / workarea returns application pixels
// (desktop pixels), so we need to convert it to device pixels with
// gdkScaleFactor.
LayoutDeviceIntRect rect(
monitor.x * gdkScaleFactor, monitor.y * gdkScaleFactor,
monitor.width * gdkScaleFactor, monitor.height * gdkScaleFactor);
LayoutDeviceIntRect availRect(
workarea.x * gdkScaleFactor, workarea.y * gdkScaleFactor,
workarea.width * gdkScaleFactor, workarea.height * gdkScaleFactor);
uint32_t pixelDepth = GetGTKPixelDepth();
// Use per-monitor scaling factor in gtk/wayland, or 1.0 otherwise.
DesktopToLayoutDeviceScale contentsScale(1.0);
#ifdef MOZ_WAYLAND
GdkDisplay* gdkDisplay = gdk_display_get_default();
if (!GDK_IS_X11_DISPLAY(gdkDisplay)) {
contentsScale.scale = gdkScaleFactor;
}
#endif
CSSToLayoutDeviceScale defaultCssScale(gdkScaleFactor *
gfxPlatformGtk::GetFontScaleFactor());
float dpi = 96.0f;
gint heightMM = gdk_screen_get_monitor_height_mm(aScreen, aMonitorNum);
if (heightMM > 0) {
dpi = rect.height / (heightMM / MM_PER_INCH_FLOAT);
}
MOZ_LOG(sScreenLog, LogLevel::Debug,
("New screen [%d %d %d %d (%d %d %d %d) %d %f %f %f]", rect.x, rect.y,
rect.width, rect.height, availRect.x, availRect.y, availRect.width,
availRect.height, pixelDepth, contentsScale.scale,
defaultCssScale.scale, dpi));
RefPtr<Screen> screen = new Screen(rect, availRect, pixelDepth, pixelDepth,
contentsScale, defaultCssScale, dpi);
return screen.forget();
}
void ScreenHelperGTK::RefreshScreens() {
MOZ_LOG(sScreenLog, LogLevel::Debug, ("Refreshing screens"));
AutoTArray<RefPtr<Screen>, 4> screenList;
GdkScreen* defaultScreen = gdk_screen_get_default();
gint numScreens = gdk_screen_get_n_monitors(defaultScreen);
MOZ_LOG(sScreenLog, LogLevel::Debug, ("GDK reports %d screens", numScreens));
for (gint i = 0; i < numScreens; i++) {
screenList.AppendElement(MakeScreen(defaultScreen, i));
}
ScreenManager& screenManager = ScreenManager::GetSingleton();
screenManager.Refresh(std::move(screenList));
}
} // namespace widget
} // namespace mozilla
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