ui/base/x/x11_util.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 // This file defines utility functions for X11 (Linux only). This code has been
   6 // ported from XCB since we can't use XCB on Ubuntu while its 32-bit support
   7 // remains woefully incomplete.
   8
   9 #include "ui/base/x/x11_util.h"
  10
  11 #include <ctype.h>
  12 #include <sys/ipc.h>
  13 #include <sys/shm.h>
  14
  15 #include <list>
  16 #include <map>
  17 #include <utility>
  18 #include <vector>
  19
  20 #include <X11/extensions/shape.h>
  21 #include <X11/extensions/XInput2.h>
  22 #include <X11/Xcursor/Xcursor.h>
  23
  24 #include "base/bind.h"
  25 #include "base/logging.h"
  26 #include "base/memory/scoped_ptr.h"
  27 #include "base/memory/singleton.h"
  28 #include "base/message_loop/message_loop.h"
  29 #include "base/metrics/histogram.h"
  30 #include "base/strings/string_number_conversions.h"
  31 #include "base/strings/string_util.h"
  32 #include "base/strings/stringprintf.h"
  33 #include "base/sys_byteorder.h"
  34 #include "base/threading/thread.h"
  35 #include "base/trace_event/trace_event.h"
  36 #include "skia/ext/image_operations.h"
  37 #include "third_party/skia/include/core/SkBitmap.h"
  38 #include "third_party/skia/include/core/SkPostConfig.h"
  39 #include "ui/base/x/x11_menu_list.h"
  40 #include "ui/base/x/x11_util_internal.h"
  41 #include "ui/events/devices/x11/device_data_manager_x11.h"
  42 #include "ui/events/devices/x11/touch_factory_x11.h"
  43 #include "ui/events/event_utils.h"
  44 #include "ui/events/keycodes/keyboard_code_conversion_x.h"
  45 #include "ui/gfx/canvas.h"
  46 #include "ui/gfx/geometry/insets.h"
  47 #include "ui/gfx/geometry/point.h"
  48 #include "ui/gfx/geometry/point_conversions.h"
  49 #include "ui/gfx/geometry/rect.h"
  50 #include "ui/gfx/geometry/size.h"
  51 #include "ui/gfx/image/image_skia.h"
  52 #include "ui/gfx/image/image_skia_rep.h"
  53 #include "ui/gfx/skia_util.h"
  54 #include "ui/gfx/x/x11_error_tracker.h"
  55
  56 #if defined(OS_FREEBSD)
  57 #include <sys/sysctl.h>
  58 #include <sys/types.h>
  59 #endif
  60
  61 namespace ui {
  62
  63 namespace {
  64
  65 int DefaultX11ErrorHandler(XDisplay* d, XErrorEvent* e) {
  66   if (base::MessageLoop::current()) {
  67     base::MessageLoop::current()->PostTask(
  68         FROM_HERE, base::Bind(&LogErrorEventDescription, d, *e));
  69   } else {
  70     LOG(ERROR)
  71         << "X error received: "
  72         << "serial " << e->serial << ", "
  73         << "error_code " << static_cast<int>(e->error_code) << ", "
  74         << "request_code " << static_cast<int>(e->request_code) << ", "
  75         << "minor_code " << static_cast<int>(e->minor_code);
  76   }
  77   return 0;
  78 }
  79
  80 int DefaultX11IOErrorHandler(XDisplay* d) {
  81   // If there's an IO error it likely means the X server has gone away
  82   LOG(ERROR) << "X IO error received (X server probably went away)";
  83   _exit(1);
  84 }
  85
  86 // Note: The caller should free the resulting value data.
  87 bool GetProperty(XID window, const std::string& property_name, long max_length,
  88                  XAtom* type, int* format, unsigned long* num_items,
  89                  unsigned char** property) {
  90   XAtom property_atom = GetAtom(property_name.c_str());
  91   unsigned long remaining_bytes = 0;
  92   return XGetWindowProperty(gfx::GetXDisplay(),
  93                             window,
  94                             property_atom,
  95                             0,          // offset into property data to read
  96                             max_length, // max length to get
  97                             False,      // deleted
  98                             AnyPropertyType,
  99                             type,
 100                             format,
 101                             num_items,
 102                             &remaining_bytes,
 103                             property);
 104 }
 105
 106 bool SupportsEWMH() {
 107   static bool supports_ewmh = false;
 108   static bool supports_ewmh_cached = false;
 109   if (!supports_ewmh_cached) {
 110     supports_ewmh_cached = true;
 111
 112     int wm_window = 0u;
 113     if (!GetIntProperty(GetX11RootWindow(),
 114                         "_NET_SUPPORTING_WM_CHECK",
 115                         &wm_window)) {
 116       supports_ewmh = false;
 117       return false;
 118     }
 119
 120     // It's possible that a window manager started earlier in this X session
 121     // left a stale _NET_SUPPORTING_WM_CHECK property when it was replaced by a
 122     // non-EWMH window manager, so we trap errors in the following requests to
 123     // avoid crashes (issue 23860).
 124
 125     // EWMH requires the supporting-WM window to also have a
 126     // _NET_SUPPORTING_WM_CHECK property pointing to itself (to avoid a stale
 127     // property referencing an ID that's been recycled for another window), so
 128     // we check that too.
 129     gfx::X11ErrorTracker err_tracker;
 130     int wm_window_property = 0;
 131     bool result = GetIntProperty(
 132         wm_window, "_NET_SUPPORTING_WM_CHECK", &wm_window_property);
 133     supports_ewmh = !err_tracker.FoundNewError() &&
 134                     result &&
 135                     wm_window_property == wm_window;
 136   }
 137
 138   return supports_ewmh;
 139 }
 140
 141 bool GetWindowManagerName(std::string* wm_name) {
 142   DCHECK(wm_name);
 143   if (!SupportsEWMH())
 144     return false;
 145
 146   int wm_window = 0;
 147   if (!GetIntProperty(GetX11RootWindow(),
 148                       "_NET_SUPPORTING_WM_CHECK",
 149                       &wm_window)) {
 150     return false;
 151   }
 152
 153   gfx::X11ErrorTracker err_tracker;
 154   bool result = GetStringProperty(
 155       static_cast<XID>(wm_window), "_NET_WM_NAME", wm_name);
 156   return !err_tracker.FoundNewError() && result;
 157 }
 158
 159 struct XImageDeleter {
 160   void operator()(XImage* image) const { XDestroyImage(image); }
 161 };
 162
 163 // Custom release function that will be passed to Skia so that it deletes the
 164 // image when the SkBitmap goes out of scope.
 165 // |address| is the pointer to the data inside the XImage.
 166 // |context| is the pointer to the XImage.
 167 void ReleaseXImage(void* address, void* context) {
 168   if (context)
 169     XDestroyImage(static_cast<XImage*>(context));
 170 }
 171
 172 // A process wide singleton that manages the usage of X cursors.
 173 class XCursorCache {
 174  public:
 175   XCursorCache() {}
 176   ~XCursorCache() {
 177     Clear();
 178   }
 179
 180   ::Cursor GetCursor(int cursor_shape) {
 181     // Lookup cursor by attempting to insert a null value, which avoids
 182     // a second pass through the map after a cache miss.
 183     std::pair<std::map<int, ::Cursor>::iterator, bool> it = cache_.insert(
 184         std::make_pair(cursor_shape, 0));
 185     if (it.second) {
 186       XDisplay* display = gfx::GetXDisplay();
 187       it.first->second = XCreateFontCursor(display, cursor_shape);
 188     }
 189     return it.first->second;
 190   }
 191
 192   void Clear() {
 193     XDisplay* display = gfx::GetXDisplay();
 194     for (std::map<int, ::Cursor>::iterator it =
 195         cache_.begin(); it != cache_.end(); ++it) {
 196       XFreeCursor(display, it->second);
 197     }
 198     cache_.clear();
 199   }
 200
 201  private:
 202   // Maps X11 font cursor shapes to Cursor IDs.
 203   std::map<int, ::Cursor> cache_;
 204
 205   DISALLOW_COPY_AND_ASSIGN(XCursorCache);
 206 };
 207
 208 XCursorCache* cursor_cache = NULL;
 209
 210 // A process wide singleton cache for custom X cursors.
 211 class XCustomCursorCache {
 212  public:
 213   static XCustomCursorCache* GetInstance() {
 214     return base::Singleton<XCustomCursorCache>::get();
 215   }
 216
 217   ::Cursor InstallCustomCursor(XcursorImage* image) {
 218     XCustomCursor* custom_cursor = new XCustomCursor(image);
 219     ::Cursor xcursor = custom_cursor->cursor();
 220     cache_[xcursor] = custom_cursor;
 221     return xcursor;
 222   }
 223
 224   void Ref(::Cursor cursor) {
 225     cache_[cursor]->Ref();
 226   }
 227
 228   void Unref(::Cursor cursor) {
 229     if (cache_[cursor]->Unref())
 230       cache_.erase(cursor);
 231   }
 232
 233   void Clear() {
 234     cache_.clear();
 235   }
 236
 237   const XcursorImage* GetXcursorImage(::Cursor cursor) const {
 238     return cache_.find(cursor)->second->image();
 239   }
 240
 241  private:
 242   friend struct base::DefaultSingletonTraits<XCustomCursorCache>;
 243
 244   class XCustomCursor {
 245    public:
 246     // This takes ownership of the image.
 247     XCustomCursor(XcursorImage* image)
 248         : image_(image),
 249           ref_(1) {
 250       cursor_ = XcursorImageLoadCursor(gfx::GetXDisplay(), image);
 251     }
 252
 253     ~XCustomCursor() {
 254       XcursorImageDestroy(image_);
 255       XFreeCursor(gfx::GetXDisplay(), cursor_);
 256     }
 257
 258     ::Cursor cursor() const { return cursor_; }
 259
 260     void Ref() {
 261       ++ref_;
 262     }
 263
 264     // Returns true if the cursor was destroyed because of the unref.
 265     bool Unref() {
 266       if (--ref_ == 0) {
 267         delete this;
 268         return true;
 269       }
 270       return false;
 271     }
 272
 273     const XcursorImage* image() const {
 274       return image_;
 275     };
 276
 277    private:
 278     XcursorImage* image_;
 279     int ref_;
 280     ::Cursor cursor_;
 281
 282     DISALLOW_COPY_AND_ASSIGN(XCustomCursor);
 283   };
 284
 285   XCustomCursorCache() {}
 286   ~XCustomCursorCache() {
 287     Clear();
 288   }
 289
 290   std::map< ::Cursor, XCustomCursor*> cache_;
 291   DISALLOW_COPY_AND_ASSIGN(XCustomCursorCache);
 292 };
 293
 294 }  // namespace
 295
 296 bool IsXInput2Available() {
 297   return DeviceDataManagerX11::GetInstance()->IsXInput2Available();
 298 }
 299
 300 bool QueryRenderSupport(Display* dpy) {
 301   int dummy;
 302   // We don't care about the version of Xrender since all the features which
 303   // we use are included in every version.
 304   static bool render_supported = XRenderQueryExtension(dpy, &dummy, &dummy);
 305
 306   return render_supported;
 307 }
 308
 309 ::Cursor GetXCursor(int cursor_shape) {
 310   if (!cursor_cache)
 311     cursor_cache = new XCursorCache;
 312   return cursor_cache->GetCursor(cursor_shape);
 313 }
 314
 315 ::Cursor CreateReffedCustomXCursor(XcursorImage* image) {
 316   return XCustomCursorCache::GetInstance()->InstallCustomCursor(image);
 317 }
 318
 319 void RefCustomXCursor(::Cursor cursor) {
 320   XCustomCursorCache::GetInstance()->Ref(cursor);
 321 }
 322
 323 void UnrefCustomXCursor(::Cursor cursor) {
 324   XCustomCursorCache::GetInstance()->Unref(cursor);
 325 }
 326
 327 XcursorImage* SkBitmapToXcursorImage(const SkBitmap* cursor_image,
 328                                      const gfx::Point& hotspot) {
 329   DCHECK(cursor_image->colorType() == kN32_SkColorType);
 330   gfx::Point hotspot_point = hotspot;
 331   SkBitmap scaled;
 332
 333   // X11 seems to have issues with cursors when images get larger than 64
 334   // pixels. So rescale the image if necessary.
 335   const float kMaxPixel = 64.f;
 336   bool needs_scale = false;
 337   if (cursor_image->width() > kMaxPixel || cursor_image->height() > kMaxPixel) {
 338     float scale = 1.f;
 339     if (cursor_image->width() > cursor_image->height())
 340       scale = kMaxPixel / cursor_image->width();
 341     else
 342       scale = kMaxPixel / cursor_image->height();
 343
 344     scaled = skia::ImageOperations::Resize(*cursor_image,
 345         skia::ImageOperations::RESIZE_BETTER,
 346         static_cast<int>(cursor_image->width() * scale),
 347         static_cast<int>(cursor_image->height() * scale));
 348     hotspot_point = gfx::ToFlooredPoint(gfx::ScalePoint(hotspot, scale));
 349     needs_scale = true;
 350   }
 351
 352   const SkBitmap* bitmap = needs_scale ? &scaled : cursor_image;
 353   XcursorImage* image = XcursorImageCreate(bitmap->width(), bitmap->height());
 354   image->xhot = std::min(bitmap->width() - 1, hotspot_point.x());
 355   image->yhot = std::min(bitmap->height() - 1, hotspot_point.y());
 356
 357   if (bitmap->width() && bitmap->height()) {
 358     bitmap->lockPixels();
 359     // The |bitmap| contains ARGB image, so just copy it.
 360     memcpy(image->pixels,
 361            bitmap->getPixels(),
 362            bitmap->width() * bitmap->height() * 4);
 363     bitmap->unlockPixels();
 364   }
 365
 366   return image;
 367 }
 368
 369
 370 int CoalescePendingMotionEvents(const XEvent* xev,
 371                                 XEvent* last_event) {
 372   XIDeviceEvent* xievent = static_cast<XIDeviceEvent*>(xev->xcookie.data);
 373   int num_coalesced = 0;
 374   XDisplay* display = xev->xany.display;
 375   int event_type = xev->xgeneric.evtype;
 376
 377   DCHECK(event_type == XI_Motion || event_type == XI_TouchUpdate);
 378
 379   while (XPending(display)) {
 380     XEvent next_event;
 381     XPeekEvent(display, &next_event);
 382
 383     // If we can't get the cookie, abort the check.
 384     if (!XGetEventData(next_event.xgeneric.display, &next_event.xcookie))
 385       return num_coalesced;
 386
 387     // If this isn't from a valid device, throw the event away, as
 388     // that's what the message pump would do. Device events come in pairs
 389     // with one from the master and one from the slave so there will
 390     // always be at least one pending.
 391     if (!ui::TouchFactory::GetInstance()->ShouldProcessXI2Event(&next_event)) {
 392       XFreeEventData(display, &next_event.xcookie);
 393       XNextEvent(display, &next_event);
 394       continue;
 395     }
 396
 397     if (next_event.type == GenericEvent &&
 398         next_event.xgeneric.evtype == event_type &&
 399         !ui::DeviceDataManagerX11::GetInstance()->IsCMTGestureEvent(
 400             &next_event)) {
 401       XIDeviceEvent* next_xievent =
 402           static_cast<XIDeviceEvent*>(next_event.xcookie.data);
 403       // Confirm that the motion event is targeted at the same window
 404       // and that no buttons or modifiers have changed.
 405       if (xievent->event == next_xievent->event &&
 406           xievent->child == next_xievent->child &&
 407           xievent->detail == next_xievent->detail &&
 408           xievent->buttons.mask_len == next_xievent->buttons.mask_len &&
 409           (memcmp(xievent->buttons.mask,
 410                   next_xievent->buttons.mask,
 411                   xievent->buttons.mask_len) == 0) &&
 412           xievent->mods.base == next_xievent->mods.base &&
 413           xievent->mods.latched == next_xievent->mods.latched &&
 414           xievent->mods.locked == next_xievent->mods.locked &&
 415           xievent->mods.effective == next_xievent->mods.effective) {
 416         XFreeEventData(display, &next_event.xcookie);
 417         // Free the previous cookie.
 418         if (num_coalesced > 0)
 419           XFreeEventData(display, &last_event->xcookie);
 420         // Get the event and its cookie data.
 421         XNextEvent(display, last_event);
 422         XGetEventData(display, &last_event->xcookie);
 423         ++num_coalesced;
 424         continue;
 425       }
 426     }
 427     // This isn't an event we want so free its cookie data.
 428     XFreeEventData(display, &next_event.xcookie);
 429     break;
 430   }
 431
 432   if (event_type == XI_Motion && num_coalesced > 0) {
 433     base::TimeDelta delta = ui::EventTimeFromNative(last_event) -
 434         ui::EventTimeFromNative(const_cast<XEvent*>(xev));
 435     UMA_HISTOGRAM_COUNTS_10000("Event.CoalescedCount.Mouse", num_coalesced);
 436     UMA_HISTOGRAM_TIMES("Event.CoalescedLatency.Mouse", delta);
 437   }
 438   return num_coalesced;
 439 }
 440
 441 void HideHostCursor() {
 442   CR_DEFINE_STATIC_LOCAL(XScopedCursor, invisible_cursor,
 443                          (CreateInvisibleCursor(), gfx::GetXDisplay()));
 444   XDefineCursor(gfx::GetXDisplay(), DefaultRootWindow(gfx::GetXDisplay()),
 445                 invisible_cursor.get());
 446 }
 447
 448 ::Cursor CreateInvisibleCursor() {
 449   XDisplay* xdisplay = gfx::GetXDisplay();
 450   ::Cursor invisible_cursor;
 451   char nodata[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
 452   XColor black;
 453   black.red = black.green = black.blue = 0;
 454   Pixmap blank = XCreateBitmapFromData(xdisplay,
 455                                        DefaultRootWindow(xdisplay),
 456                                        nodata, 8, 8);
 457   invisible_cursor = XCreatePixmapCursor(xdisplay, blank, blank,
 458                                          &black, &black, 0, 0);
 459   XFreePixmap(xdisplay, blank);
 460   return invisible_cursor;
 461 }
 462
 463 void SetUseOSWindowFrame(XID window, bool use_os_window_frame) {
 464   // This data structure represents additional hints that we send to the window
 465   // manager and has a direct lineage back to Motif, which defined this de facto
 466   // standard. This struct doesn't seem 64-bit safe though, but it's what GDK
 467   // does.
 468   typedef struct {
 469     unsigned long flags;
 470     unsigned long functions;
 471     unsigned long decorations;
 472     long input_mode;
 473     unsigned long status;
 474   } MotifWmHints;
 475
 476   MotifWmHints motif_hints;
 477   memset(&motif_hints, 0, sizeof(motif_hints));
 478   // Signals that the reader of the _MOTIF_WM_HINTS property should pay
 479   // attention to the value of |decorations|.
 480   motif_hints.flags = (1L << 1);
 481   motif_hints.decorations = use_os_window_frame ? 1 : 0;
 482
 483   XAtom hint_atom = GetAtom("_MOTIF_WM_HINTS");
 484   XChangeProperty(gfx::GetXDisplay(),
 485                   window,
 486                   hint_atom,
 487                   hint_atom,
 488                   32,
 489                   PropModeReplace,
 490                   reinterpret_cast<unsigned char*>(&motif_hints),
 491                   sizeof(MotifWmHints)/sizeof(long));
 492 }
 493
 494 bool IsShapeExtensionAvailable() {
 495   int dummy;
 496   static bool is_shape_available =
 497       XShapeQueryExtension(gfx::GetXDisplay(), &dummy, &dummy);
 498   return is_shape_available;
 499 }
 500
 501 XID GetX11RootWindow() {
 502   return DefaultRootWindow(gfx::GetXDisplay());
 503 }
 504
 505 bool GetCurrentDesktop(int* desktop) {
 506   return GetIntProperty(GetX11RootWindow(), "_NET_CURRENT_DESKTOP", desktop);
 507 }
 508
 509 void SetHideTitlebarWhenMaximizedProperty(XID window,
 510                                           HideTitlebarWhenMaximized property) {
 511   // XChangeProperty() expects "hide" to be long.
 512   unsigned long hide = property;
 513   XChangeProperty(gfx::GetXDisplay(),
 514       window,
 515       GetAtom("_GTK_HIDE_TITLEBAR_WHEN_MAXIMIZED"),
 516       XA_CARDINAL,
 517       32,  // size in bits
 518       PropModeReplace,
 519       reinterpret_cast<unsigned char*>(&hide),
 520       1);
 521 }
 522
 523 void ClearX11DefaultRootWindow() {
 524   XDisplay* display = gfx::GetXDisplay();
 525   XID root_window = GetX11RootWindow();
 526   gfx::Rect root_bounds;
 527   if (!GetOuterWindowBounds(root_window, &root_bounds)) {
 528     LOG(ERROR) << "Failed to get the bounds of the X11 root window";
 529     return;
 530   }
 531
 532   XGCValues gc_values = {0};
 533   gc_values.foreground = BlackPixel(display, DefaultScreen(display));
 534   GC gc = XCreateGC(display, root_window, GCForeground, &gc_values);
 535   XFillRectangle(display, root_window, gc,
 536                  root_bounds.x(),
 537                  root_bounds.y(),
 538                  root_bounds.width(),
 539                  root_bounds.height());
 540   XFreeGC(display, gc);
 541 }
 542
 543 bool IsWindowVisible(XID window) {
 544   TRACE_EVENT0("ui", "IsWindowVisible");
 545
 546   XWindowAttributes win_attributes;
 547   if (!XGetWindowAttributes(gfx::GetXDisplay(), window, &win_attributes))
 548     return false;
 549   if (win_attributes.map_state != IsViewable)
 550     return false;
 551
 552   // Minimized windows are not visible.
 553   std::vector<XAtom> wm_states;
 554   if (GetAtomArrayProperty(window, "_NET_WM_STATE", &wm_states)) {
 555     XAtom hidden_atom = GetAtom("_NET_WM_STATE_HIDDEN");
 556     if (std::find(wm_states.begin(), wm_states.end(), hidden_atom) !=
 557             wm_states.end()) {
 558       return false;
 559     }
 560   }
 561
 562   // Some compositing window managers (notably kwin) do not actually unmap
 563   // windows on desktop switch, so we also must check the current desktop.
 564   int window_desktop, current_desktop;
 565   return (!GetWindowDesktop(window, &window_desktop) ||
 566           !GetCurrentDesktop(&current_desktop) ||
 567           window_desktop == kAllDesktops ||
 568           window_desktop == current_desktop);
 569 }
 570
 571 bool GetInnerWindowBounds(XID window, gfx::Rect* rect) {
 572   Window root, child;
 573   int x, y;
 574   unsigned int width, height;
 575   unsigned int border_width, depth;
 576
 577   if (!XGetGeometry(gfx::GetXDisplay(), window, &root, &x, &y,
 578                     &width, &height, &border_width, &depth))
 579     return false;
 580
 581   if (!XTranslateCoordinates(gfx::GetXDisplay(), window, root,
 582                              0, 0, &x, &y, &child))
 583     return false;
 584
 585   *rect = gfx::Rect(x, y, width, height);
 586
 587   return true;
 588 }
 589
 590 bool GetWindowExtents(XID window, gfx::Insets* extents) {
 591   std::vector<int> insets;
 592   if (!GetIntArrayProperty(window, "_NET_FRAME_EXTENTS", &insets))
 593     return false;
 594   if (insets.size() != 4)
 595     return false;
 596
 597   int left = insets[0];
 598   int right = insets[1];
 599   int top = insets[2];
 600   int bottom = insets[3];
 601   extents->Set(-top, -left, -bottom, -right);
 602   return true;
 603 }
 604
 605 bool GetOuterWindowBounds(XID window, gfx::Rect* rect) {
 606   if (!GetInnerWindowBounds(window, rect))
 607     return false;
 608
 609   gfx::Insets extents;
 610   if (GetWindowExtents(window, &extents))
 611     rect->Inset(extents);
 612   // Not all window managers support _NET_FRAME_EXTENTS so return true even if
 613   // requesting the property fails.
 614
 615   return true;
 616 }
 617
 618
 619 bool WindowContainsPoint(XID window, gfx::Point screen_loc) {
 620   TRACE_EVENT0("ui", "WindowContainsPoint");
 621
 622   gfx::Rect window_rect;
 623   if (!GetOuterWindowBounds(window, &window_rect))
 624     return false;
 625
 626   if (!window_rect.Contains(screen_loc))
 627     return false;
 628
 629   if (!IsShapeExtensionAvailable())
 630     return true;
 631
 632   // According to http://www.x.org/releases/X11R7.6/doc/libXext/shapelib.html,
 633   // if an X display supports the shape extension the bounds of a window are
 634   // defined as the intersection of the window bounds and the interior
 635   // rectangles. This means to determine if a point is inside a window for the
 636   // purpose of input handling we have to check the rectangles in the ShapeInput
 637   // list.
 638   // According to http://www.x.org/releases/current/doc/xextproto/shape.html,
 639   // we need to also respect the ShapeBounding rectangles.
 640   // The effective input region of a window is defined to be the intersection
 641   // of the client input region with both the default input region and the
 642   // client bounding region. Any portion of the client input region that is not
 643   // included in both the default input region and the client bounding region
 644   // will not be included in the effective input region on the screen.
 645   int rectangle_kind[] = {ShapeInput, ShapeBounding};
 646   for (size_t kind_index = 0;
 647        kind_index < arraysize(rectangle_kind);
 648        kind_index++) {
 649     int dummy;
 650     int shape_rects_size = 0;
 651     gfx::XScopedPtr<XRectangle[]> shape_rects(XShapeGetRectangles(
 652         gfx::GetXDisplay(), window, rectangle_kind[kind_index],
 653         &shape_rects_size, &dummy));
 654     if (!shape_rects) {
 655       // The shape is empty. This can occur when |window| is minimized.
 656       DCHECK_EQ(0, shape_rects_size);
 657       return false;
 658     }
 659     bool is_in_shape_rects = false;
 660     for (int i = 0; i < shape_rects_size; ++i) {
 661       // The ShapeInput and ShapeBounding rects are to be in window space, so we
 662       // have to translate by the window_rect's offset to map to screen space.
 663       const XRectangle& rect = shape_rects[i];
 664       gfx::Rect shape_rect =
 665           gfx::Rect(rect.x + window_rect.x(), rect.y + window_rect.y(),
 666                     rect.width, rect.height);
 667       if (shape_rect.Contains(screen_loc)) {
 668         is_in_shape_rects = true;
 669         break;
 670       }
 671     }
 672     if (!is_in_shape_rects)
 673       return false;
 674   }
 675   return true;
 676 }
 677
 678
 679 bool PropertyExists(XID window, const std::string& property_name) {
 680   XAtom type = None;
 681   int format = 0;  // size in bits of each item in 'property'
 682   unsigned long num_items = 0;
 683   unsigned char* property = NULL;
 684
 685   int result = GetProperty(window, property_name, 1,
 686                            &type, &format, &num_items, &property);
 687   gfx::XScopedPtr<unsigned char> scoped_property(property);
 688   if (result != Success)
 689     return false;
 690
 691   return num_items > 0;
 692 }
 693
 694 bool GetRawBytesOfProperty(XID window,
 695                            XAtom property,
 696                            scoped_refptr<base::RefCountedMemory>* out_data,
 697                            size_t* out_data_items,
 698                            XAtom* out_type) {
 699   // Retrieve the data from our window.
 700   unsigned long nitems = 0;
 701   unsigned long nbytes = 0;
 702   XAtom prop_type = None;
 703   int prop_format = 0;
 704   unsigned char* property_data = NULL;
 705   if (XGetWindowProperty(gfx::GetXDisplay(), window, property,
 706                          0, 0x1FFFFFFF /* MAXINT32 / 4 */, False,
 707                          AnyPropertyType, &prop_type, &prop_format,
 708                          &nitems, &nbytes, &property_data) != Success) {
 709     return false;
 710   }
 711   gfx::XScopedPtr<unsigned char> scoped_property(property_data);
 712
 713   if (prop_type == None)
 714     return false;
 715
 716   size_t bytes = 0;
 717   // So even though we should theoretically have nbytes (and we can't
 718   // pass NULL there), we need to manually calculate the byte length here
 719   // because nbytes always returns zero.
 720   switch (prop_format) {
 721     case 8:
 722       bytes = nitems;
 723       break;
 724     case 16:
 725       bytes = sizeof(short) * nitems;
 726       break;
 727     case 32:
 728       bytes = sizeof(long) * nitems;
 729       break;
 730     default:
 731       NOTREACHED();
 732       break;
 733   }
 734
 735   if (out_data)
 736     *out_data = new XRefcountedMemory(scoped_property.release(), bytes);
 737
 738   if (out_data_items)
 739     *out_data_items = nitems;
 740
 741   if (out_type)
 742     *out_type = prop_type;
 743
 744   return true;
 745 }
 746
 747 bool GetIntProperty(XID window, const std::string& property_name, int* value) {
 748   XAtom type = None;
 749   int format = 0;  // size in bits of each item in 'property'
 750   unsigned long num_items = 0;
 751   unsigned char* property = NULL;
 752
 753   int result = GetProperty(window, property_name, 1,
 754                            &type, &format, &num_items, &property);
 755   gfx::XScopedPtr<unsigned char> scoped_property(property);
 756   if (result != Success)
 757     return false;
 758
 759   if (format != 32 || num_items != 1)
 760     return false;
 761
 762   *value = static_cast<int>(*(reinterpret_cast<long*>(property)));
 763   return true;
 764 }
 765
 766 bool GetXIDProperty(XID window, const std::string& property_name, XID* value) {
 767   XAtom type = None;
 768   int format = 0;  // size in bits of each item in 'property'
 769   unsigned long num_items = 0;
 770   unsigned char* property = NULL;
 771
 772   int result = GetProperty(window, property_name, 1,
 773                            &type, &format, &num_items, &property);
 774   gfx::XScopedPtr<unsigned char> scoped_property(property);
 775   if (result != Success)
 776     return false;
 777
 778   if (format != 32 || num_items != 1)
 779     return false;
 780
 781   *value = *(reinterpret_cast<XID*>(property));
 782   return true;
 783 }
 784
 785 bool GetIntArrayProperty(XID window,
 786                          const std::string& property_name,
 787                          std::vector<int>* value) {
 788   XAtom type = None;
 789   int format = 0;  // size in bits of each item in 'property'
 790   unsigned long num_items = 0;
 791   unsigned char* properties = NULL;
 792
 793   int result = GetProperty(window, property_name,
 794                            (~0L), // (all of them)
 795                            &type, &format, &num_items, &properties);
 796   gfx::XScopedPtr<unsigned char> scoped_properties(properties);
 797   if (result != Success)
 798     return false;
 799
 800   if (format != 32)
 801     return false;
 802
 803   long* int_properties = reinterpret_cast<long*>(properties);
 804   value->clear();
 805   for (unsigned long i = 0; i < num_items; ++i) {
 806     value->push_back(static_cast<int>(int_properties[i]));
 807   }
 808   return true;
 809 }
 810
 811 bool GetAtomArrayProperty(XID window,
 812                           const std::string& property_name,
 813                           std::vector<XAtom>* value) {
 814   XAtom type = None;
 815   int format = 0;  // size in bits of each item in 'property'
 816   unsigned long num_items = 0;
 817   unsigned char* properties = NULL;
 818
 819   int result = GetProperty(window, property_name,
 820                            (~0L), // (all of them)
 821                            &type, &format, &num_items, &properties);
 822   gfx::XScopedPtr<unsigned char> scoped_properties(properties);
 823   if (result != Success)
 824     return false;
 825
 826   if (type != XA_ATOM)
 827     return false;
 828
 829   XAtom* atom_properties = reinterpret_cast<XAtom*>(properties);
 830   value->clear();
 831   value->insert(value->begin(), atom_properties, atom_properties + num_items);
 832   return true;
 833 }
 834
 835 bool GetStringProperty(
 836     XID window, const std::string& property_name, std::string* value) {
 837   XAtom type = None;
 838   int format = 0;  // size in bits of each item in 'property'
 839   unsigned long num_items = 0;
 840   unsigned char* property = NULL;
 841
 842   int result = GetProperty(window, property_name, 1024,
 843                            &type, &format, &num_items, &property);
 844   gfx::XScopedPtr<unsigned char> scoped_property(property);
 845   if (result != Success)
 846     return false;
 847
 848   if (format != 8)
 849     return false;
 850
 851   value->assign(reinterpret_cast<char*>(property), num_items);
 852   return true;
 853 }
 854
 855 bool SetIntProperty(XID window,
 856                     const std::string& name,
 857                     const std::string& type,
 858                     int value) {
 859   std::vector<int> values(1, value);
 860   return SetIntArrayProperty(window, name, type, values);
 861 }
 862
 863 bool SetIntArrayProperty(XID window,
 864                          const std::string& name,
 865                          const std::string& type,
 866                          const std::vector<int>& value) {
 867   DCHECK(!value.empty());
 868   XAtom name_atom = GetAtom(name.c_str());
 869   XAtom type_atom = GetAtom(type.c_str());
 870
 871   // XChangeProperty() expects values of type 32 to be longs.
 872   scoped_ptr<long[]> data(new long[value.size()]);
 873   for (size_t i = 0; i < value.size(); ++i)
 874     data[i] = value[i];
 875
 876   gfx::X11ErrorTracker err_tracker;
 877   XChangeProperty(gfx::GetXDisplay(),
 878                   window,
 879                   name_atom,
 880                   type_atom,
 881                   32,  // size in bits of items in 'value'
 882                   PropModeReplace,
 883                   reinterpret_cast<const unsigned char*>(data.get()),
 884                   value.size());  // num items
 885   return !err_tracker.FoundNewError();
 886 }
 887
 888 bool SetAtomProperty(XID window,
 889                      const std::string& name,
 890                      const std::string& type,
 891                      XAtom value) {
 892   std::vector<XAtom> values(1, value);
 893   return SetAtomArrayProperty(window, name, type, values);
 894 }
 895
 896 bool SetAtomArrayProperty(XID window,
 897                           const std::string& name,
 898                           const std::string& type,
 899                           const std::vector<XAtom>& value) {
 900   DCHECK(!value.empty());
 901   XAtom name_atom = GetAtom(name.c_str());
 902   XAtom type_atom = GetAtom(type.c_str());
 903
 904   // XChangeProperty() expects values of type 32 to be longs.
 905   scoped_ptr<XAtom[]> data(new XAtom[value.size()]);
 906   for (size_t i = 0; i < value.size(); ++i)
 907     data[i] = value[i];
 908
 909   gfx::X11ErrorTracker err_tracker;
 910   XChangeProperty(gfx::GetXDisplay(),
 911                   window,
 912                   name_atom,
 913                   type_atom,
 914                   32,  // size in bits of items in 'value'
 915                   PropModeReplace,
 916                   reinterpret_cast<const unsigned char*>(data.get()),
 917                   value.size());  // num items
 918   return !err_tracker.FoundNewError();
 919 }
 920
 921 bool SetStringProperty(XID window,
 922                        XAtom property,
 923                        XAtom type,
 924                        const std::string& value) {
 925   gfx::X11ErrorTracker err_tracker;
 926   XChangeProperty(gfx::GetXDisplay(),
 927                   window,
 928                   property,
 929                   type,
 930                   8,
 931                   PropModeReplace,
 932                   reinterpret_cast<const unsigned char*>(value.c_str()),
 933                   value.size());
 934   return !err_tracker.FoundNewError();
 935 }
 936
 937 XAtom GetAtom(const char* name) {
 938   // TODO(derat): Cache atoms to avoid round-trips to the server.
 939   return XInternAtom(gfx::GetXDisplay(), name, false);
 940 }
 941
 942 void SetWindowClassHint(XDisplay* display,
 943                         XID window,
 944                         const std::string& res_name,
 945                         const std::string& res_class) {
 946   XClassHint class_hints;
 947   // const_cast is safe because XSetClassHint does not modify the strings.
 948   // Just to be safe, the res_name and res_class parameters are local copies,
 949   // not const references.
 950   class_hints.res_name = const_cast<char*>(res_name.c_str());
 951   class_hints.res_class = const_cast<char*>(res_class.c_str());
 952   XSetClassHint(display, window, &class_hints);
 953 }
 954
 955 void SetWindowRole(XDisplay* display, XID window, const std::string& role) {
 956   if (role.empty()) {
 957     XDeleteProperty(display, window, GetAtom("WM_WINDOW_ROLE"));
 958   } else {
 959     char* role_c = const_cast<char*>(role.c_str());
 960     XChangeProperty(display, window, GetAtom("WM_WINDOW_ROLE"), XA_STRING, 8,
 961                     PropModeReplace,
 962                     reinterpret_cast<unsigned char*>(role_c),
 963                     role.size());
 964   }
 965 }
 966
 967 bool GetCustomFramePrefDefault() {
 968   // If the window manager doesn't support enough of EWMH to tell us its name,
 969   // assume that it doesn't want custom frames. For example, _NET_WM_MOVERESIZE
 970   // is needed for frame-drag-initiated window movement.
 971   std::string wm_name;
 972   if (!GetWindowManagerName(&wm_name))
 973     return false;
 974
 975   // Also disable custom frames for (at-least-partially-)EWMH-supporting tiling
 976   // window managers.
 977   ui::WindowManagerName wm = GuessWindowManager();
 978   if (wm == WM_AWESOME ||
 979       wm == WM_I3 ||
 980       wm == WM_ION3 ||
 981       wm == WM_MATCHBOX ||
 982       wm == WM_NOTION ||
 983       wm == WM_QTILE ||
 984       wm == WM_RATPOISON ||
 985       wm == WM_STUMPWM ||
 986       wm == WM_WMII)
 987     return false;
 988
 989   // Handle a few more window managers that don't get along well with custom
 990   // frames.
 991   if (wm == WM_ICE_WM ||
 992       wm == WM_KWIN)
 993     return false;
 994
 995   // For everything else, use custom frames.
 996   return true;
 997 }
 998
 999 bool GetWindowDesktop(XID window, int* desktop) {
1000   return GetIntProperty(window, "_NET_WM_DESKTOP", desktop);
1001 }
1002
1003 std::string GetX11ErrorString(XDisplay* display, int err) {
1004   char buffer[256];
1005   XGetErrorText(display, err, buffer, arraysize(buffer));
1006   return buffer;
1007 }
1008
1009 // Returns true if |window| is a named window.
1010 bool IsWindowNamed(XID window) {
1011   XTextProperty prop;
1012   if (!XGetWMName(gfx::GetXDisplay(), window, &prop) || !prop.value)
1013     return false;
1014
1015   XFree(prop.value);
1016   return true;
1017 }
1018
1019 bool EnumerateChildren(EnumerateWindowsDelegate* delegate, XID window,
1020                        const int max_depth, int depth) {
1021   if (depth > max_depth)
1022     return false;
1023
1024   std::vector<XID> windows;
1025   std::vector<XID>::iterator iter;
1026   if (depth == 0) {
1027     XMenuList::GetInstance()->InsertMenuWindowXIDs(&windows);
1028     // Enumerate the menus first.
1029     for (iter = windows.begin(); iter != windows.end(); iter++) {
1030       if (delegate->ShouldStopIterating(*iter))
1031         return true;
1032     }
1033     windows.clear();
1034   }
1035
1036   XID root, parent, *children;
1037   unsigned int num_children;
1038   int status = XQueryTree(gfx::GetXDisplay(), window, &root, &parent, &children,
1039                           &num_children);
1040   if (status == 0)
1041     return false;
1042
1043   for (int i = static_cast<int>(num_children) - 1; i >= 0; i--)
1044     windows.push_back(children[i]);
1045
1046   XFree(children);
1047
1048   // XQueryTree returns the children of |window| in bottom-to-top order, so
1049   // reverse-iterate the list to check the windows from top-to-bottom.
1050   for (iter = windows.begin(); iter != windows.end(); iter++) {
1051     if (IsWindowNamed(*iter) && delegate->ShouldStopIterating(*iter))
1052       return true;
1053   }
1054
1055   // If we're at this point, we didn't find the window we're looking for at the
1056   // current level, so we need to recurse to the next level.  We use a second
1057   // loop because the recursion and call to XQueryTree are expensive and is only
1058   // needed for a small number of cases.
1059   if (++depth <= max_depth) {
1060     for (iter = windows.begin(); iter != windows.end(); iter++) {
1061       if (EnumerateChildren(delegate, *iter, max_depth, depth))
1062         return true;
1063     }
1064   }
1065
1066   return false;
1067 }
1068
1069 bool EnumerateAllWindows(EnumerateWindowsDelegate* delegate, int max_depth) {
1070   XID root = GetX11RootWindow();
1071   return EnumerateChildren(delegate, root, max_depth, 0);
1072 }
1073
1074 void EnumerateTopLevelWindows(ui::EnumerateWindowsDelegate* delegate) {
1075   std::vector<XID> stack;
1076   if (!ui::GetXWindowStack(ui::GetX11RootWindow(), &stack)) {
1077     // Window Manager doesn't support _NET_CLIENT_LIST_STACKING, so fall back
1078     // to old school enumeration of all X windows.  Some WMs parent 'top-level'
1079     // windows in unnamed actual top-level windows (ion WM), so extend the
1080     // search depth to all children of top-level windows.
1081     const int kMaxSearchDepth = 1;
1082     ui::EnumerateAllWindows(delegate, kMaxSearchDepth);
1083     return;
1084   }
1085   XMenuList::GetInstance()->InsertMenuWindowXIDs(&stack);
1086
1087   std::vector<XID>::iterator iter;
1088   for (iter = stack.begin(); iter != stack.end(); iter++) {
1089     if (delegate->ShouldStopIterating(*iter))
1090       return;
1091   }
1092 }
1093
1094 bool GetXWindowStack(Window window, std::vector<XID>* windows) {
1095   windows->clear();
1096
1097   Atom type;
1098   int format;
1099   unsigned long count;
1100   unsigned char *data = NULL;
1101   if (GetProperty(window,
1102                   "_NET_CLIENT_LIST_STACKING",
1103                   ~0L,
1104                   &type,
1105                   &format,
1106                   &count,
1107                   &data) != Success) {
1108     return false;
1109   }
1110   gfx::XScopedPtr<unsigned char> scoped_data(data);
1111
1112   bool result = false;
1113   if (type == XA_WINDOW && format == 32 && data && count > 0) {
1114     result = true;
1115     XID* stack = reinterpret_cast<XID*>(data);
1116     for (long i = static_cast<long>(count) - 1; i >= 0; i--)
1117       windows->push_back(stack[i]);
1118   }
1119
1120   return result;
1121 }
1122
1123 bool CopyAreaToCanvas(XID drawable,
1124                       gfx::Rect source_bounds,
1125                       gfx::Point dest_offset,
1126                       gfx::Canvas* canvas) {
1127   scoped_ptr<XImage, XImageDeleter> image(XGetImage(
1128       gfx::GetXDisplay(), drawable, source_bounds.x(), source_bounds.y(),
1129       source_bounds.width(), source_bounds.height(), AllPlanes, ZPixmap));
1130   if (!image) {
1131     LOG(ERROR) << "XGetImage failed";
1132     return false;
1133   }
1134
1135   if (image->bits_per_pixel == 32) {
1136     if ((0xff << SK_R32_SHIFT) != image->red_mask ||
1137         (0xff << SK_G32_SHIFT) != image->green_mask ||
1138         (0xff << SK_B32_SHIFT) != image->blue_mask) {
1139       LOG(WARNING) << "XImage and Skia byte orders differ";
1140       return false;
1141     }
1142
1143     // Set the alpha channel before copying to the canvas.  Otherwise, areas of
1144     // the framebuffer that were cleared by ply-image rather than being obscured
1145     // by an image during boot may end up transparent.
1146     // TODO(derat|marcheu): Remove this if/when ply-image has been updated to
1147     // set the framebuffer's alpha channel regardless of whether the device
1148     // claims to support alpha or not.
1149     for (int i = 0; i < image->width * image->height * 4; i += 4)
1150       image->data[i + 3] = 0xff;
1151
1152     SkBitmap bitmap;
1153     bitmap.installPixels(
1154         SkImageInfo::MakeN32Premul(image->width, image->height), image->data,
1155         image->bytes_per_line, nullptr, &ReleaseXImage, image.release());
1156     gfx::ImageSkia image_skia;
1157     gfx::ImageSkiaRep image_rep(bitmap, canvas->image_scale());
1158     image_skia.AddRepresentation(image_rep);
1159     canvas->DrawImageInt(image_skia, dest_offset.x(), dest_offset.y());
1160   } else {
1161     NOTIMPLEMENTED() << "Unsupported bits-per-pixel " << image->bits_per_pixel;
1162     return false;
1163   }
1164
1165   return true;
1166 }
1167
1168 WindowManagerName GuessWindowManager() {
1169   std::string name;
1170   if (GetWindowManagerName(&name)) {
1171     // These names are taken from the WMs' source code.
1172     if (name == "awesome")
1173       return WM_AWESOME;
1174     if (name == "Blackbox")
1175       return WM_BLACKBOX;
1176     if (name == "Compiz" || name == "compiz")
1177       return WM_COMPIZ;
1178     if (name == "e16" || name == "Enlightenment")
1179       return WM_ENLIGHTENMENT;
1180     if (name == "Fluxbox")
1181       return WM_FLUXBOX;
1182     if (name == "i3")
1183       return WM_I3;
1184     if (base::StartsWith(name, "IceWM", base::CompareCase::SENSITIVE))
1185       return WM_ICE_WM;
1186     if (name == "ion3")
1187       return WM_ION3;
1188     if (name == "KWin")
1189       return WM_KWIN;
1190     if (name == "matchbox")
1191       return WM_MATCHBOX;
1192     if (name == "Metacity")
1193       return WM_METACITY;
1194     if (name == "Mutter (Muffin)")
1195       return WM_MUFFIN;
1196     if (name == "GNOME Shell")
1197       return WM_MUTTER;  // GNOME Shell uses Mutter
1198     if (name == "Mutter")
1199       return WM_MUTTER;
1200     if (name == "notion")
1201       return WM_NOTION;
1202     if (name == "Openbox")
1203       return WM_OPENBOX;
1204     if (name == "qtile")
1205       return WM_QTILE;
1206     if (name == "ratpoison")
1207       return WM_RATPOISON;
1208     if (name == "stumpwm")
1209       return WM_STUMPWM;
1210     if (name == "wmii")
1211       return WM_WMII;
1212     if (name == "Xfwm4")
1213       return WM_XFWM4;
1214   }
1215   return WM_UNKNOWN;
1216 }
1217
1218 std::string GuessWindowManagerName() {
1219   std::string name;
1220   if (GetWindowManagerName(&name))
1221     return name;
1222   return "Unknown";
1223 }
1224
1225 void SetDefaultX11ErrorHandlers() {
1226   SetX11ErrorHandlers(NULL, NULL);
1227 }
1228
1229 bool IsX11WindowFullScreen(XID window) {
1230   // If _NET_WM_STATE_FULLSCREEN is in _NET_SUPPORTED, use the presence or
1231   // absence of _NET_WM_STATE_FULLSCREEN in _NET_WM_STATE to determine
1232   // whether we're fullscreen.
1233   XAtom fullscreen_atom = GetAtom("_NET_WM_STATE_FULLSCREEN");
1234   if (WmSupportsHint(fullscreen_atom)) {
1235     std::vector<XAtom> atom_properties;
1236     if (GetAtomArrayProperty(window,
1237                              "_NET_WM_STATE",
1238                              &atom_properties)) {
1239       return std::find(atom_properties.begin(),
1240                        atom_properties.end(),
1241                        fullscreen_atom) !=
1242           atom_properties.end();
1243     }
1244   }
1245
1246   gfx::Rect window_rect;
1247   if (!ui::GetOuterWindowBounds(window, &window_rect))
1248     return false;
1249
1250   // We can't use gfx::Screen here because we don't have an aura::Window. So
1251   // instead just look at the size of the default display.
1252   //
1253   // TODO(erg): Actually doing this correctly would require pulling out xrandr,
1254   // which we don't even do in the desktop screen yet.
1255   ::XDisplay* display = gfx::GetXDisplay();
1256   ::Screen* screen = DefaultScreenOfDisplay(display);
1257   int width = WidthOfScreen(screen);
1258   int height = HeightOfScreen(screen);
1259   return window_rect.size() == gfx::Size(width, height);
1260 }
1261
1262 bool WmSupportsHint(XAtom atom) {
1263   if (!SupportsEWMH())
1264     return false;
1265
1266   std::vector<XAtom> supported_atoms;
1267   if (!GetAtomArrayProperty(GetX11RootWindow(),
1268                             "_NET_SUPPORTED",
1269                             &supported_atoms)) {
1270     return false;
1271   }
1272
1273   return std::find(supported_atoms.begin(), supported_atoms.end(), atom) !=
1274       supported_atoms.end();
1275 }
1276
1277 XRefcountedMemory::XRefcountedMemory(unsigned char* x11_data, size_t length)
1278     : x11_data_(length ? x11_data : nullptr), length_(length) {
1279 }
1280
1281 const unsigned char* XRefcountedMemory::front() const {
1282   return x11_data_.get();
1283 }
1284
1285 size_t XRefcountedMemory::size() const {
1286   return length_;
1287 }
1288
1289 XRefcountedMemory::~XRefcountedMemory() {
1290 }
1291
1292 XScopedCursor::XScopedCursor(::Cursor cursor, XDisplay* display)
1293     : cursor_(cursor),
1294       display_(display) {
1295 }
1296
1297 XScopedCursor::~XScopedCursor() {
1298   reset(0U);
1299 }
1300
1301 ::Cursor XScopedCursor::get() const {
1302   return cursor_;
1303 }
1304
1305 void XScopedCursor::reset(::Cursor cursor) {
1306   if (cursor_)
1307     XFreeCursor(display_, cursor_);
1308   cursor_ = cursor;
1309 }
1310
1311 namespace test {
1312
1313 void ResetXCursorCache() {
1314   delete cursor_cache;
1315   cursor_cache = NULL;
1316 }
1317
1318 const XcursorImage* GetCachedXcursorImage(::Cursor cursor) {
1319   return XCustomCursorCache::GetInstance()->GetXcursorImage(cursor);
1320 }
1321 }
1322
1323 // ----------------------------------------------------------------------------
1324 // These functions are declared in x11_util_internal.h because they require
1325 // XLib.h to be included, and it conflicts with many other headers.
1326 XRenderPictFormat* GetRenderARGB32Format(XDisplay* dpy) {
1327   static XRenderPictFormat* pictformat = NULL;
1328   if (pictformat)
1329     return pictformat;
1330
1331   // First look for a 32-bit format which ignores the alpha value
1332   XRenderPictFormat templ;
1333   templ.depth = 32;
1334   templ.type = PictTypeDirect;
1335   templ.direct.red = 16;
1336   templ.direct.green = 8;
1337   templ.direct.blue = 0;
1338   templ.direct.redMask = 0xff;
1339   templ.direct.greenMask = 0xff;
1340   templ.direct.blueMask = 0xff;
1341   templ.direct.alphaMask = 0;
1342
1343   static const unsigned long kMask =
1344     PictFormatType | PictFormatDepth |
1345     PictFormatRed | PictFormatRedMask |
1346     PictFormatGreen | PictFormatGreenMask |
1347     PictFormatBlue | PictFormatBlueMask |
1348     PictFormatAlphaMask;
1349
1350   pictformat = XRenderFindFormat(dpy, kMask, &templ, 0 /* first result */);
1351
1352   if (!pictformat) {
1353     // Not all X servers support xRGB32 formats. However, the XRENDER spec says
1354     // that they must support an ARGB32 format, so we can always return that.
1355     pictformat = XRenderFindStandardFormat(dpy, PictStandardARGB32);
1356     CHECK(pictformat) << "XRENDER ARGB32 not supported.";
1357   }
1358
1359   return pictformat;
1360 }
1361
1362 void SetX11ErrorHandlers(XErrorHandler error_handler,
1363                          XIOErrorHandler io_error_handler) {
1364   XSetErrorHandler(error_handler ? error_handler : DefaultX11ErrorHandler);
1365   XSetIOErrorHandler(
1366       io_error_handler ? io_error_handler : DefaultX11IOErrorHandler);
1367 }
1368
1369 void LogErrorEventDescription(XDisplay* dpy,
1370                               const XErrorEvent& error_event) {
1371   char error_str[256];
1372   char request_str[256];
1373
1374   XGetErrorText(dpy, error_event.error_code, error_str, sizeof(error_str));
1375
1376   strncpy(request_str, "Unknown", sizeof(request_str));
1377   if (error_event.request_code < 128) {
1378     std::string num = base::UintToString(error_event.request_code);
1379     XGetErrorDatabaseText(
1380         dpy, "XRequest", num.c_str(), "Unknown", request_str,
1381         sizeof(request_str));
1382   } else {
1383     int num_ext;
1384     gfx::XScopedPtr<char* [],
1385                     gfx::XObjectDeleter<char*, int, XFreeExtensionList>>
1386         ext_list(XListExtensions(dpy, &num_ext));
1387
1388     for (int i = 0; i < num_ext; i++) {
1389       int ext_code, first_event, first_error;
1390       XQueryExtension(dpy, ext_list[i], &ext_code, &first_event, &first_error);
1391       if (error_event.request_code == ext_code) {
1392         std::string msg = base::StringPrintf(
1393             "%s.%d", ext_list[i], error_event.minor_code);
1394         XGetErrorDatabaseText(
1395             dpy, "XRequest", msg.c_str(), "Unknown", request_str,
1396             sizeof(request_str));
1397         break;
1398       }
1399     }
1400   }
1401
1402   LOG(WARNING)
1403       << "X error received: "
1404       << "serial " << error_event.serial << ", "
1405       << "error_code " << static_cast<int>(error_event.error_code)
1406       << " (" << error_str << "), "
1407       << "request_code " << static_cast<int>(error_event.request_code) << ", "
1408       << "minor_code " << static_cast<int>(error_event.minor_code)
1409       << " (" << request_str << ")";
1410 }
1411
1412 // ----------------------------------------------------------------------------
1413 // End of x11_util_internal.h
1414
1415
1416 }  // namespace ui