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comparison: widget/gtk/nsScreenManagerGtk.cpp
widget/gtk/nsScreenManagerGtk.cpp
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- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:4fc6aaf1528b |
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #include "nsScreenManagerGtk.h" | |
| 7 #include "nsScreenGtk.h" | |
| 8 #include "nsIComponentManager.h" | |
| 9 #include "nsRect.h" | |
| 10 #include "nsAutoPtr.h" | |
| 11 | |
| 12 #define SCREEN_MANAGER_LIBRARY_LOAD_FAILED ((PRLibrary*)1) | |
| 13 | |
| 14 #ifdef MOZ_X11 | |
| 15 #include <gdk/gdkx.h> | |
| 16 // prototypes from Xinerama.h | |
| 17 typedef Bool (*_XnrmIsActive_fn)(Display *dpy); | |
| 18 typedef XineramaScreenInfo* (*_XnrmQueryScreens_fn)(Display *dpy, int *number); | |
| 19 #endif | |
| 20 | |
| 21 #include <gtk/gtk.h> | |
| 22 | |
| 23 | |
| 24 static GdkFilterReturn | |
| 25 root_window_event_filter(GdkXEvent *aGdkXEvent, GdkEvent *aGdkEvent, | |
| 26 gpointer aClosure) | |
| 27 { | |
| 28 nsScreenManagerGtk *manager = static_cast<nsScreenManagerGtk*>(aClosure); | |
| 29 #ifdef MOZ_X11 | |
| 30 XEvent *xevent = static_cast<XEvent*>(aGdkXEvent); | |
| 31 | |
| 32 // See comments in nsScreenGtk::Init below. | |
| 33 switch (xevent->type) { | |
| 34 case ConfigureNotify: | |
| 35 manager->Init(); | |
| 36 break; | |
| 37 case PropertyNotify: | |
| 38 { | |
| 39 XPropertyEvent *propertyEvent = &xevent->xproperty; | |
| 40 if (propertyEvent->atom == manager->NetWorkareaAtom()) { | |
| 41 manager->Init(); | |
| 42 } | |
| 43 } | |
| 44 break; | |
| 45 default: | |
| 46 break; | |
| 47 } | |
| 48 #endif | |
| 49 | |
| 50 return GDK_FILTER_CONTINUE; | |
| 51 } | |
| 52 | |
| 53 nsScreenManagerGtk :: nsScreenManagerGtk ( ) | |
| 54 : mXineramalib(nullptr) | |
| 55 , mRootWindow(nullptr) | |
| 56 { | |
| 57 // nothing else to do. I guess we could cache a bunch of information | |
| 58 // here, but we want to ask the device at runtime in case anything | |
| 59 // has changed. | |
| 60 } | |
| 61 | |
| 62 | |
| 63 nsScreenManagerGtk :: ~nsScreenManagerGtk() | |
| 64 { | |
| 65 if (mRootWindow) { | |
| 66 gdk_window_remove_filter(mRootWindow, root_window_event_filter, this); | |
| 67 g_object_unref(mRootWindow); | |
| 68 mRootWindow = nullptr; | |
| 69 } | |
| 70 | |
| 71 /* XineramaIsActive() registers a callback function close_display() | |
| 72 * in X, which is to be called in XCloseDisplay(). This is the case | |
| 73 * if Xinerama is active, even if only with one screen. | |
| 74 * | |
| 75 * We can't unload libXinerama.so.1 here because this will make | |
| 76 * the address of close_display() registered in X to be invalid and | |
| 77 * it will crash when XCloseDisplay() is called later. */ | |
| 78 } | |
| 79 | |
| 80 | |
| 81 // addref, release, QI | |
| 82 NS_IMPL_ISUPPORTS(nsScreenManagerGtk, nsIScreenManager) | |
| 83 | |
| 84 | |
| 85 // this function will make sure that everything has been initialized. | |
| 86 nsresult | |
| 87 nsScreenManagerGtk :: EnsureInit() | |
| 88 { | |
| 89 if (mCachedScreenArray.Count() > 0) | |
| 90 return NS_OK; | |
| 91 | |
| 92 mRootWindow = gdk_get_default_root_window(); | |
| 93 g_object_ref(mRootWindow); | |
| 94 | |
| 95 // GDK_STRUCTURE_MASK ==> StructureNotifyMask, for ConfigureNotify | |
| 96 // GDK_PROPERTY_CHANGE_MASK ==> PropertyChangeMask, for PropertyNotify | |
| 97 gdk_window_set_events(mRootWindow, | |
| 98 GdkEventMask(gdk_window_get_events(mRootWindow) | | |
| 99 GDK_STRUCTURE_MASK | | |
| 100 GDK_PROPERTY_CHANGE_MASK)); | |
| 101 gdk_window_add_filter(mRootWindow, root_window_event_filter, this); | |
| 102 #ifdef MOZ_X11 | |
| 103 mNetWorkareaAtom = | |
| 104 XInternAtom(GDK_WINDOW_XDISPLAY(mRootWindow), "_NET_WORKAREA", False); | |
| 105 #endif | |
| 106 | |
| 107 return Init(); | |
| 108 } | |
| 109 | |
| 110 nsresult | |
| 111 nsScreenManagerGtk :: Init() | |
| 112 { | |
| 113 #ifdef MOZ_X11 | |
| 114 XineramaScreenInfo *screenInfo = nullptr; | |
| 115 int numScreens; | |
| 116 | |
| 117 if (!mXineramalib) { | |
| 118 mXineramalib = PR_LoadLibrary("libXinerama.so.1"); | |
| 119 if (!mXineramalib) { | |
| 120 mXineramalib = SCREEN_MANAGER_LIBRARY_LOAD_FAILED; | |
| 121 } | |
| 122 } | |
| 123 if (mXineramalib && mXineramalib != SCREEN_MANAGER_LIBRARY_LOAD_FAILED) { | |
| 124 _XnrmIsActive_fn _XnrmIsActive = (_XnrmIsActive_fn) | |
| 125 PR_FindFunctionSymbol(mXineramalib, "XineramaIsActive"); | |
| 126 | |
| 127 _XnrmQueryScreens_fn _XnrmQueryScreens = (_XnrmQueryScreens_fn) | |
| 128 PR_FindFunctionSymbol(mXineramalib, "XineramaQueryScreens"); | |
| 129 | |
| 130 // get the number of screens via xinerama | |
| 131 Display *display = GDK_DISPLAY_XDISPLAY(gdk_display_get_default()); | |
| 132 if (_XnrmIsActive && _XnrmQueryScreens && _XnrmIsActive(display)) { | |
| 133 screenInfo = _XnrmQueryScreens(display, &numScreens); | |
| 134 } | |
| 135 } | |
| 136 | |
| 137 // screenInfo == nullptr if either Xinerama couldn't be loaded or | |
| 138 // isn't running on the current display | |
| 139 if (!screenInfo || numScreens == 1) { | |
| 140 numScreens = 1; | |
| 141 #endif | |
| 142 nsRefPtr<nsScreenGtk> screen; | |
| 143 | |
| 144 if (mCachedScreenArray.Count() > 0) { | |
| 145 screen = static_cast<nsScreenGtk*>(mCachedScreenArray[0]); | |
| 146 } else { | |
| 147 screen = new nsScreenGtk(); | |
| 148 if (!screen || !mCachedScreenArray.AppendObject(screen)) { | |
| 149 return NS_ERROR_OUT_OF_MEMORY; | |
| 150 } | |
| 151 } | |
| 152 | |
| 153 screen->Init(mRootWindow); | |
| 154 #ifdef MOZ_X11 | |
| 155 } | |
| 156 // If Xinerama is enabled and there's more than one screen, fill | |
| 157 // in the info for all of the screens. If that's not the case | |
| 158 // then nsScreenGTK() defaults to the screen width + height | |
| 159 else { | |
| 160 #ifdef DEBUG | |
| 161 printf("Xinerama superpowers activated for %d screens!\n", numScreens); | |
| 162 #endif | |
| 163 for (int i = 0; i < numScreens; ++i) { | |
| 164 nsRefPtr<nsScreenGtk> screen; | |
| 165 if (mCachedScreenArray.Count() > i) { | |
| 166 screen = static_cast<nsScreenGtk*>(mCachedScreenArray[i]); | |
| 167 } else { | |
| 168 screen = new nsScreenGtk(); | |
| 169 if (!screen || !mCachedScreenArray.AppendObject(screen)) { | |
| 170 return NS_ERROR_OUT_OF_MEMORY; | |
| 171 } | |
| 172 } | |
| 173 | |
| 174 // initialize this screen object | |
| 175 screen->Init(&screenInfo[i]); | |
| 176 } | |
| 177 } | |
| 178 // Remove any screens that are no longer present. | |
| 179 while (mCachedScreenArray.Count() > numScreens) { | |
| 180 mCachedScreenArray.RemoveObjectAt(mCachedScreenArray.Count() - 1); | |
| 181 } | |
| 182 | |
| 183 if (screenInfo) { | |
| 184 XFree(screenInfo); | |
| 185 } | |
| 186 #endif | |
| 187 | |
| 188 return NS_OK; | |
| 189 } | |
| 190 | |
| 191 | |
| 192 // | |
| 193 // ScreenForRect | |
| 194 // | |
| 195 // Returns the screen that contains the rectangle. If the rect overlaps | |
| 196 // multiple screens, it picks the screen with the greatest area of intersection. | |
| 197 // | |
| 198 // The coordinates are in pixels (not app units) and in screen coordinates. | |
| 199 // | |
| 200 NS_IMETHODIMP | |
| 201 nsScreenManagerGtk :: ScreenForRect ( int32_t aX, int32_t aY, | |
| 202 int32_t aWidth, int32_t aHeight, | |
| 203 nsIScreen **aOutScreen ) | |
| 204 { | |
| 205 nsresult rv; | |
| 206 rv = EnsureInit(); | |
| 207 if (NS_FAILED(rv)) { | |
| 208 NS_ERROR("nsScreenManagerGtk::EnsureInit() failed from ScreenForRect"); | |
| 209 return rv; | |
| 210 } | |
| 211 // which screen ( index from zero ) should we return? | |
| 212 uint32_t which = 0; | |
| 213 // Optimize for the common case. If the number of screens is only | |
| 214 // one then this will fall through with which == 0 and will get the | |
| 215 // primary screen. | |
| 216 if (mCachedScreenArray.Count() > 1) { | |
| 217 // walk the list of screens and find the one that has the most | |
| 218 // surface area. | |
| 219 uint32_t area = 0; | |
| 220 nsIntRect windowRect(aX, aY, aWidth, aHeight); | |
| 221 for (int32_t i = 0, i_end = mCachedScreenArray.Count(); i < i_end; ++i) { | |
| 222 int32_t x, y, width, height; | |
| 223 x = y = width = height = 0; | |
| 224 mCachedScreenArray[i]->GetRect(&x, &y, &width, &height); | |
| 225 // calculate the surface area | |
| 226 nsIntRect screenRect(x, y, width, height); | |
| 227 screenRect.IntersectRect(screenRect, windowRect); | |
| 228 uint32_t tempArea = screenRect.width * screenRect.height; | |
| 229 if (tempArea >= area) { | |
| 230 which = i; | |
| 231 area = tempArea; | |
| 232 } | |
| 233 } | |
| 234 } | |
| 235 *aOutScreen = mCachedScreenArray.SafeObjectAt(which); | |
| 236 NS_IF_ADDREF(*aOutScreen); | |
| 237 return NS_OK; | |
| 238 | |
| 239 } // ScreenForRect | |
| 240 | |
| 241 | |
| 242 // | |
| 243 // GetPrimaryScreen | |
| 244 // | |
| 245 // The screen with the menubar/taskbar. This shouldn't be needed very | |
| 246 // often. | |
| 247 // | |
| 248 NS_IMETHODIMP | |
| 249 nsScreenManagerGtk :: GetPrimaryScreen(nsIScreen * *aPrimaryScreen) | |
| 250 { | |
| 251 nsresult rv; | |
| 252 rv = EnsureInit(); | |
| 253 if (NS_FAILED(rv)) { | |
| 254 NS_ERROR("nsScreenManagerGtk::EnsureInit() failed from GetPrimaryScreen"); | |
| 255 return rv; | |
| 256 } | |
| 257 *aPrimaryScreen = mCachedScreenArray.SafeObjectAt(0); | |
| 258 NS_IF_ADDREF(*aPrimaryScreen); | |
| 259 return NS_OK; | |
| 260 | |
| 261 } // GetPrimaryScreen | |
| 262 | |
| 263 | |
| 264 // | |
| 265 // GetNumberOfScreens | |
| 266 // | |
| 267 // Returns how many physical screens are available. | |
| 268 // | |
| 269 NS_IMETHODIMP | |
| 270 nsScreenManagerGtk :: GetNumberOfScreens(uint32_t *aNumberOfScreens) | |
| 271 { | |
| 272 nsresult rv; | |
| 273 rv = EnsureInit(); | |
| 274 if (NS_FAILED(rv)) { | |
| 275 NS_ERROR("nsScreenManagerGtk::EnsureInit() failed from GetNumberOfScreens"); | |
| 276 return rv; | |
| 277 } | |
| 278 *aNumberOfScreens = mCachedScreenArray.Count(); | |
| 279 return NS_OK; | |
| 280 | |
| 281 } // GetNumberOfScreens | |
| 282 | |
| 283 NS_IMETHODIMP | |
| 284 nsScreenManagerGtk::GetSystemDefaultScale(float *aDefaultScale) | |
| 285 { | |
| 286 *aDefaultScale = 1.0f; | |
| 287 return NS_OK; | |
| 288 } | |
| 289 | |
| 290 NS_IMETHODIMP | |
| 291 nsScreenManagerGtk :: ScreenForNativeWidget (void *aWidget, nsIScreen **outScreen) | |
| 292 { | |
| 293 nsresult rv; | |
| 294 rv = EnsureInit(); | |
| 295 if (NS_FAILED(rv)) { | |
| 296 NS_ERROR("nsScreenManagerGtk::EnsureInit() failed from ScreenForNativeWidget"); | |
| 297 return rv; | |
| 298 } | |
| 299 | |
| 300 if (mCachedScreenArray.Count() > 1) { | |
| 301 // I don't know how to go from GtkWindow to nsIScreen, especially | |
| 302 // given xinerama and stuff, so let's just do this | |
| 303 gint x, y, width, height; | |
| 304 #if (MOZ_WIDGET_GTK == 2) | |
| 305 gint depth; | |
| 306 #endif | |
| 307 x = y = width = height = 0; | |
| 308 | |
| 309 #if (MOZ_WIDGET_GTK == 2) | |
| 310 gdk_window_get_geometry(GDK_WINDOW(aWidget), &x, &y, &width, &height, | |
| 311 &depth); | |
| 312 #else | |
| 313 gdk_window_get_geometry(GDK_WINDOW(aWidget), &x, &y, &width, &height); | |
| 314 #endif | |
| 315 gdk_window_get_origin(GDK_WINDOW(aWidget), &x, &y); | |
| 316 rv = ScreenForRect(x, y, width, height, outScreen); | |
| 317 } else { | |
| 318 rv = GetPrimaryScreen(outScreen); | |
| 319 } | |
| 320 | |
| 321 return rv; | |
| 322 } |
