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tenfourfox/widget/gtk/nsScreenManagerGtk.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "nsScreenManagerGtk.h"
#include "nsScreenGtk.h"
#include "nsIComponentManager.h"
#include "nsRect.h"
#include "nsAutoPtr.h"
#include "nsGtkUtils.h"
#define SCREEN_MANAGER_LIBRARY_LOAD_FAILED ((PRLibrary*)1)
#ifdef MOZ_X11
#include <gdk/gdkx.h>
// prototypes from Xinerama.h
typedef Bool (*_XnrmIsActive_fn)(Display *dpy);
typedef XineramaScreenInfo* (*_XnrmQueryScreens_fn)(Display *dpy, int *number);
#endif
#include <gtk/gtk.h>
void
monitors_changed(GdkScreen* aScreen, gpointer aClosure)
{
nsScreenManagerGtk *manager = static_cast<nsScreenManagerGtk*>(aClosure);
manager->Init();
}
static GdkFilterReturn
root_window_event_filter(GdkXEvent *aGdkXEvent, GdkEvent *aGdkEvent,
gpointer aClosure)
{
nsScreenManagerGtk *manager = static_cast<nsScreenManagerGtk*>(aClosure);
#ifdef MOZ_X11
XEvent *xevent = static_cast<XEvent*>(aGdkXEvent);
// See comments in nsScreenGtk::Init below.
switch (xevent->type) {
case PropertyNotify:
{
XPropertyEvent *propertyEvent = &xevent->xproperty;
if (propertyEvent->atom == manager->NetWorkareaAtom()) {
manager->Init();
}
}
break;
default:
break;
}
#endif
return GDK_FILTER_CONTINUE;
}
nsScreenManagerGtk :: nsScreenManagerGtk ( )
: mXineramalib(nullptr)
, mRootWindow(nullptr)
, mNetWorkareaAtom(0)
{
// nothing else to do. I guess we could cache a bunch of information
// here, but we want to ask the device at runtime in case anything
// has changed.
}
nsScreenManagerGtk :: ~nsScreenManagerGtk()
{
g_signal_handlers_disconnect_by_func(gdk_screen_get_default(),
FuncToGpointer(monitors_changed),
this);
if (mRootWindow) {
gdk_window_remove_filter(mRootWindow, root_window_event_filter, this);
g_object_unref(mRootWindow);
mRootWindow = nullptr;
}
/* XineramaIsActive() registers a callback function close_display()
* in X, which is to be called in XCloseDisplay(). This is the case
* if Xinerama is active, even if only with one screen.
*
* We can't unload libXinerama.so.1 here because this will make
* the address of close_display() registered in X to be invalid and
* it will crash when XCloseDisplay() is called later. */
}
// addref, release, QI
NS_IMPL_ISUPPORTS(nsScreenManagerGtk, nsIScreenManager)
// this function will make sure that everything has been initialized.
nsresult
nsScreenManagerGtk :: EnsureInit()
{
if (mCachedScreenArray.Count() > 0)
return NS_OK;
mRootWindow = gdk_get_default_root_window();
if (!mRootWindow) {
// Sometimes we don't initial X (e.g., xpcshell)
return NS_OK;
}
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(gdk_screen_get_default(), "monitors-changed",
G_CALLBACK(monitors_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", False);
#endif
return Init();
}
nsresult
nsScreenManagerGtk :: Init()
{
#ifdef MOZ_X11
XineramaScreenInfo *screenInfo = nullptr;
int numScreens;
bool useXinerama = GDK_IS_X11_DISPLAY(gdk_display_get_default());
if (useXinerama && !mXineramalib) {
mXineramalib = PR_LoadLibrary("libXinerama.so.1");
if (!mXineramalib) {
mXineramalib = SCREEN_MANAGER_LIBRARY_LOAD_FAILED;
}
}
if (mXineramalib && mXineramalib != SCREEN_MANAGER_LIBRARY_LOAD_FAILED) {
_XnrmIsActive_fn _XnrmIsActive = (_XnrmIsActive_fn)
PR_FindFunctionSymbol(mXineramalib, "XineramaIsActive");
_XnrmQueryScreens_fn _XnrmQueryScreens = (_XnrmQueryScreens_fn)
PR_FindFunctionSymbol(mXineramalib, "XineramaQueryScreens");
// get the number of screens via xinerama
Display *display = GDK_DISPLAY_XDISPLAY(gdk_display_get_default());
if (_XnrmIsActive && _XnrmQueryScreens && _XnrmIsActive(display)) {
screenInfo = _XnrmQueryScreens(display, &numScreens);
}
}
// screenInfo == nullptr if either Xinerama couldn't be loaded or
// isn't running on the current display
if (!screenInfo || numScreens == 1) {
numScreens = 1;
#endif
RefPtr<nsScreenGtk> screen;
if (mCachedScreenArray.Count() > 0) {
screen = static_cast<nsScreenGtk*>(mCachedScreenArray[0]);
} else {
screen = new nsScreenGtk();
if (!screen || !mCachedScreenArray.AppendObject(screen)) {
return NS_ERROR_OUT_OF_MEMORY;
}
}
screen->Init(mRootWindow);
#ifdef MOZ_X11
}
// If Xinerama is enabled and there's more than one screen, fill
// in the info for all of the screens. If that's not the case
// then nsScreenGTK() defaults to the screen width + height
else {
#ifdef DEBUG
printf("Xinerama superpowers activated for %d screens!\n", numScreens);
#endif
for (int i = 0; i < numScreens; ++i) {
RefPtr<nsScreenGtk> screen;
if (mCachedScreenArray.Count() > i) {
screen = static_cast<nsScreenGtk*>(mCachedScreenArray[i]);
} else {
screen = new nsScreenGtk();
if (!screen || !mCachedScreenArray.AppendObject(screen)) {
return NS_ERROR_OUT_OF_MEMORY;
}
}
// initialize this screen object
screen->Init(&screenInfo[i]);
}
}
// Remove any screens that are no longer present.
while (mCachedScreenArray.Count() > numScreens) {
mCachedScreenArray.RemoveObjectAt(mCachedScreenArray.Count() - 1);
}
if (screenInfo) {
XFree(screenInfo);
}
#endif
return NS_OK;
}
NS_IMETHODIMP
nsScreenManagerGtk :: ScreenForId ( uint32_t aId, nsIScreen **outScreen )
{
*outScreen = nullptr;
nsresult rv;
rv = EnsureInit();
if (NS_FAILED(rv)) {
NS_ERROR("nsScreenManagerGtk::EnsureInit() failed from ScreenForId");
return rv;
}
for (int32_t i = 0, i_end = mCachedScreenArray.Count(); i < i_end; ++i) {
uint32_t id;
rv = mCachedScreenArray[i]->GetId(&id);
if (NS_SUCCEEDED(rv) && id == aId) {
NS_IF_ADDREF(*outScreen = mCachedScreenArray[i]);
return NS_OK;
}
}
return NS_ERROR_FAILURE;
}
//
// ScreenForRect
//
// Returns the screen that contains the rectangle. If the rect overlaps
// multiple screens, it picks the screen with the greatest area of intersection.
//
// The coordinates are in CSS pixels (not app units) and in screen coordinates.
//
NS_IMETHODIMP
nsScreenManagerGtk :: ScreenForRect( int32_t aX, int32_t aY,
int32_t aWidth, int32_t aHeight,
nsIScreen **aOutScreen )
{
uint32_t scale = nsScreenGtk::GetDPIScale();
return ScreenForRectPix(aX*scale, aY*scale, aWidth*scale, aHeight*scale,
aOutScreen);
}
//
// ScreenForRectPix
//
// Returns the screen that contains the rectangle. If the rect overlaps
// multiple screens, it picks the screen with the greatest area of intersection.
//
// The coordinates are in device (X11) pixels.
//
nsresult
nsScreenManagerGtk :: ScreenForRectPix( int32_t aX, int32_t aY,
int32_t aWidth, int32_t aHeight,
nsIScreen **aOutScreen )
{
nsresult rv;
rv = EnsureInit();
if (NS_FAILED(rv)) {
NS_ERROR("nsScreenManagerGtk::EnsureInit() failed from ScreenForRect");
return rv;
}
// which screen ( index from zero ) should we return?
uint32_t which = 0;
// Optimize for the common case. If the number of screens is only
// one then this will fall through with which == 0 and will get the
// primary screen.
if (mCachedScreenArray.Count() > 1) {
// walk the list of screens and find the one that has the most
// surface area.
uint32_t area = 0;
nsIntRect windowRect(aX, aY, aWidth, aHeight);
for (int32_t i = 0, i_end = mCachedScreenArray.Count(); i < i_end; ++i) {
int32_t x, y, width, height;
x = y = width = height = 0;
mCachedScreenArray[i]->GetRect(&x, &y, &width, &height);
// calculate the surface area
nsIntRect screenRect(x, y, width, height);
screenRect.IntersectRect(screenRect, windowRect);
uint32_t tempArea = screenRect.width * screenRect.height;
if (tempArea >= area) {
which = i;
area = tempArea;
}
}
}
*aOutScreen = mCachedScreenArray.SafeObjectAt(which);
NS_IF_ADDREF(*aOutScreen);
return NS_OK;
} // ScreenForRect
//
// GetPrimaryScreen
//
// The screen with the menubar/taskbar. This shouldn't be needed very
// often.
//
NS_IMETHODIMP
nsScreenManagerGtk :: GetPrimaryScreen(nsIScreen * *aPrimaryScreen)
{
nsresult rv;
rv = EnsureInit();
if (NS_FAILED(rv)) {
NS_ERROR("nsScreenManagerGtk::EnsureInit() failed from GetPrimaryScreen");
return rv;
}
*aPrimaryScreen = mCachedScreenArray.SafeObjectAt(0);
NS_IF_ADDREF(*aPrimaryScreen);
return NS_OK;
} // GetPrimaryScreen
//
// GetNumberOfScreens
//
// Returns how many physical screens are available.
//
NS_IMETHODIMP
nsScreenManagerGtk :: GetNumberOfScreens(uint32_t *aNumberOfScreens)
{
nsresult rv;
rv = EnsureInit();
if (NS_FAILED(rv)) {
NS_ERROR("nsScreenManagerGtk::EnsureInit() failed from GetNumberOfScreens");
return rv;
}
*aNumberOfScreens = mCachedScreenArray.Count();
return NS_OK;
} // GetNumberOfScreens
NS_IMETHODIMP
nsScreenManagerGtk::GetSystemDefaultScale(float *aDefaultScale)
{
*aDefaultScale = nsScreenGtk::GetDPIScale();
return NS_OK;
}
NS_IMETHODIMP
nsScreenManagerGtk :: ScreenForNativeWidget (void *aWidget, nsIScreen **outScreen)
{
nsresult rv;
rv = EnsureInit();
if (NS_FAILED(rv)) {
NS_ERROR("nsScreenManagerGtk::EnsureInit() failed from ScreenForNativeWidget");
return rv;
}
if (mCachedScreenArray.Count() > 1) {
// I don't know how to go from GtkWindow to nsIScreen, especially
// given xinerama and stuff, so let's just do this
gint x, y, width, height;
#if (MOZ_WIDGET_GTK == 2)
gint depth;
#endif
x = y = width = height = 0;
#if (MOZ_WIDGET_GTK == 2)
gdk_window_get_geometry(GDK_WINDOW(aWidget), &x, &y, &width, &height,
&depth);
#else
gdk_window_get_geometry(GDK_WINDOW(aWidget), &x, &y, &width, &height);
#endif
gdk_window_get_origin(GDK_WINDOW(aWidget), &x, &y);
rv = ScreenForRectPix(x, y, width, height, outScreen);
} else {
rv = GetPrimaryScreen(outScreen);
}
return rv;
}
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