mirror of
https://github.com/mozilla/gecko-dev.git
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323 lines
9.1 KiB
C++
323 lines
9.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsScreenManagerGtk.h"
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#include "nsScreenGtk.h"
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#include "nsIComponentManager.h"
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#include "nsRect.h"
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#include "nsAutoPtr.h"
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#define SCREEN_MANAGER_LIBRARY_LOAD_FAILED ((PRLibrary*)1)
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#ifdef MOZ_X11
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#include <gdk/gdkx.h>
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// prototypes from Xinerama.h
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typedef Bool (*_XnrmIsActive_fn)(Display *dpy);
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typedef XineramaScreenInfo* (*_XnrmQueryScreens_fn)(Display *dpy, int *number);
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#endif
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#include <gtk/gtk.h>
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static GdkFilterReturn
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root_window_event_filter(GdkXEvent *aGdkXEvent, GdkEvent *aGdkEvent,
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gpointer aClosure)
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{
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nsScreenManagerGtk *manager = static_cast<nsScreenManagerGtk*>(aClosure);
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#ifdef MOZ_X11
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XEvent *xevent = static_cast<XEvent*>(aGdkXEvent);
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// See comments in nsScreenGtk::Init below.
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switch (xevent->type) {
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case ConfigureNotify:
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manager->Init();
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break;
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case PropertyNotify:
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{
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XPropertyEvent *propertyEvent = &xevent->xproperty;
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if (propertyEvent->atom == manager->NetWorkareaAtom()) {
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manager->Init();
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}
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}
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break;
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default:
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break;
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}
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#endif
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return GDK_FILTER_CONTINUE;
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}
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nsScreenManagerGtk :: nsScreenManagerGtk ( )
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: mXineramalib(nullptr)
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, mRootWindow(nullptr)
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{
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// nothing else to do. I guess we could cache a bunch of information
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// here, but we want to ask the device at runtime in case anything
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// has changed.
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}
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nsScreenManagerGtk :: ~nsScreenManagerGtk()
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{
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if (mRootWindow) {
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gdk_window_remove_filter(mRootWindow, root_window_event_filter, this);
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g_object_unref(mRootWindow);
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mRootWindow = nullptr;
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}
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/* XineramaIsActive() registers a callback function close_display()
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* in X, which is to be called in XCloseDisplay(). This is the case
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* if Xinerama is active, even if only with one screen.
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*
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* We can't unload libXinerama.so.1 here because this will make
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* the address of close_display() registered in X to be invalid and
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* it will crash when XCloseDisplay() is called later. */
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}
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// addref, release, QI
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NS_IMPL_ISUPPORTS1(nsScreenManagerGtk, nsIScreenManager)
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// this function will make sure that everything has been initialized.
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nsresult
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nsScreenManagerGtk :: EnsureInit()
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{
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if (mCachedScreenArray.Count() > 0)
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return NS_OK;
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mRootWindow = gdk_get_default_root_window();
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g_object_ref(mRootWindow);
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// GDK_STRUCTURE_MASK ==> StructureNotifyMask, for ConfigureNotify
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// GDK_PROPERTY_CHANGE_MASK ==> PropertyChangeMask, for PropertyNotify
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gdk_window_set_events(mRootWindow,
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GdkEventMask(gdk_window_get_events(mRootWindow) |
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GDK_STRUCTURE_MASK |
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GDK_PROPERTY_CHANGE_MASK));
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gdk_window_add_filter(mRootWindow, root_window_event_filter, this);
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#ifdef MOZ_X11
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mNetWorkareaAtom =
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XInternAtom(GDK_WINDOW_XDISPLAY(mRootWindow), "_NET_WORKAREA", False);
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#endif
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return Init();
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}
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nsresult
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nsScreenManagerGtk :: Init()
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{
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#ifdef MOZ_X11
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XineramaScreenInfo *screenInfo = nullptr;
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int numScreens;
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if (!mXineramalib) {
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mXineramalib = PR_LoadLibrary("libXinerama.so.1");
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if (!mXineramalib) {
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mXineramalib = SCREEN_MANAGER_LIBRARY_LOAD_FAILED;
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}
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}
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if (mXineramalib && mXineramalib != SCREEN_MANAGER_LIBRARY_LOAD_FAILED) {
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_XnrmIsActive_fn _XnrmIsActive = (_XnrmIsActive_fn)
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PR_FindFunctionSymbol(mXineramalib, "XineramaIsActive");
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_XnrmQueryScreens_fn _XnrmQueryScreens = (_XnrmQueryScreens_fn)
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PR_FindFunctionSymbol(mXineramalib, "XineramaQueryScreens");
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// get the number of screens via xinerama
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Display *display = GDK_DISPLAY_XDISPLAY(gdk_display_get_default());
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if (_XnrmIsActive && _XnrmQueryScreens && _XnrmIsActive(display)) {
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screenInfo = _XnrmQueryScreens(display, &numScreens);
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}
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}
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// screenInfo == nullptr if either Xinerama couldn't be loaded or
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// isn't running on the current display
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if (!screenInfo || numScreens == 1) {
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numScreens = 1;
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#endif
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nsRefPtr<nsScreenGtk> screen;
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if (mCachedScreenArray.Count() > 0) {
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screen = static_cast<nsScreenGtk*>(mCachedScreenArray[0]);
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} else {
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screen = new nsScreenGtk();
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if (!screen || !mCachedScreenArray.AppendObject(screen)) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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}
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screen->Init(mRootWindow);
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#ifdef MOZ_X11
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}
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// If Xinerama is enabled and there's more than one screen, fill
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// in the info for all of the screens. If that's not the case
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// then nsScreenGTK() defaults to the screen width + height
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else {
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#ifdef DEBUG
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printf("Xinerama superpowers activated for %d screens!\n", numScreens);
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#endif
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for (int i = 0; i < numScreens; ++i) {
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nsRefPtr<nsScreenGtk> screen;
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if (mCachedScreenArray.Count() > i) {
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screen = static_cast<nsScreenGtk*>(mCachedScreenArray[i]);
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} else {
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screen = new nsScreenGtk();
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if (!screen || !mCachedScreenArray.AppendObject(screen)) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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}
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// initialize this screen object
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screen->Init(&screenInfo[i]);
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}
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}
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// Remove any screens that are no longer present.
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while (mCachedScreenArray.Count() > numScreens) {
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mCachedScreenArray.RemoveObjectAt(mCachedScreenArray.Count() - 1);
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}
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if (screenInfo) {
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XFree(screenInfo);
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}
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#endif
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return NS_OK;
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}
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//
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// ScreenForRect
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//
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// Returns the screen that contains the rectangle. If the rect overlaps
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// multiple screens, it picks the screen with the greatest area of intersection.
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//
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// The coordinates are in pixels (not app units) and in screen coordinates.
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//
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NS_IMETHODIMP
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nsScreenManagerGtk :: ScreenForRect ( int32_t aX, int32_t aY,
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int32_t aWidth, int32_t aHeight,
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nsIScreen **aOutScreen )
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{
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nsresult rv;
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rv = EnsureInit();
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if (NS_FAILED(rv)) {
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NS_ERROR("nsScreenManagerGtk::EnsureInit() failed from ScreenForRect");
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return rv;
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}
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// which screen ( index from zero ) should we return?
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uint32_t which = 0;
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// Optimize for the common case. If the number of screens is only
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// one then this will fall through with which == 0 and will get the
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// primary screen.
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if (mCachedScreenArray.Count() > 1) {
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// walk the list of screens and find the one that has the most
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// surface area.
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uint32_t area = 0;
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nsIntRect windowRect(aX, aY, aWidth, aHeight);
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for (int32_t i = 0, i_end = mCachedScreenArray.Count(); i < i_end; ++i) {
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int32_t x, y, width, height;
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x = y = width = height = 0;
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mCachedScreenArray[i]->GetRect(&x, &y, &width, &height);
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// calculate the surface area
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nsIntRect screenRect(x, y, width, height);
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screenRect.IntersectRect(screenRect, windowRect);
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uint32_t tempArea = screenRect.width * screenRect.height;
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if (tempArea >= area) {
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which = i;
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area = tempArea;
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}
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}
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}
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*aOutScreen = mCachedScreenArray.SafeObjectAt(which);
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NS_IF_ADDREF(*aOutScreen);
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return NS_OK;
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} // ScreenForRect
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//
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// GetPrimaryScreen
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//
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// The screen with the menubar/taskbar. This shouldn't be needed very
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// often.
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//
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NS_IMETHODIMP
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nsScreenManagerGtk :: GetPrimaryScreen(nsIScreen * *aPrimaryScreen)
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{
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nsresult rv;
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rv = EnsureInit();
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if (NS_FAILED(rv)) {
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NS_ERROR("nsScreenManagerGtk::EnsureInit() failed from GetPrimaryScreen");
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return rv;
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}
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*aPrimaryScreen = mCachedScreenArray.SafeObjectAt(0);
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NS_IF_ADDREF(*aPrimaryScreen);
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return NS_OK;
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} // GetPrimaryScreen
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//
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// GetNumberOfScreens
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//
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// Returns how many physical screens are available.
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//
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NS_IMETHODIMP
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nsScreenManagerGtk :: GetNumberOfScreens(uint32_t *aNumberOfScreens)
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{
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nsresult rv;
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rv = EnsureInit();
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if (NS_FAILED(rv)) {
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NS_ERROR("nsScreenManagerGtk::EnsureInit() failed from GetNumberOfScreens");
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return rv;
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}
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*aNumberOfScreens = mCachedScreenArray.Count();
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return NS_OK;
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} // GetNumberOfScreens
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NS_IMETHODIMP
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nsScreenManagerGtk::GetSystemDefaultScale(float *aDefaultScale)
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{
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*aDefaultScale = 1.0f;
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return NS_OK;
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}
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NS_IMETHODIMP
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nsScreenManagerGtk :: ScreenForNativeWidget (void *aWidget, nsIScreen **outScreen)
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{
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nsresult rv;
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rv = EnsureInit();
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if (NS_FAILED(rv)) {
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NS_ERROR("nsScreenManagerGtk::EnsureInit() failed from ScreenForNativeWidget");
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return rv;
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}
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if (mCachedScreenArray.Count() > 1) {
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// I don't know how to go from GtkWindow to nsIScreen, especially
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// given xinerama and stuff, so let's just do this
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gint x, y, width, height;
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#if (MOZ_WIDGET_GTK == 2)
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gint depth;
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#endif
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x = y = width = height = 0;
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#if (MOZ_WIDGET_GTK == 2)
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gdk_window_get_geometry(GDK_WINDOW(aWidget), &x, &y, &width, &height,
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&depth);
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#else
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gdk_window_get_geometry(GDK_WINDOW(aWidget), &x, &y, &width, &height);
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#endif
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gdk_window_get_origin(GDK_WINDOW(aWidget), &x, &y);
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rv = ScreenForRect(x, y, width, height, outScreen);
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} else {
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rv = GetPrimaryScreen(outScreen);
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}
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return rv;
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}
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