ui/base/x/x11

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This source file includes following definitions.
get_cached_pict_formats
DefaultX11ErrorHandler
DefaultX11IOErrorHandler
GetProperty
GetCursor
Clear
GetInstance
InstallCustomCursor
Ref
Unref
Clear
ref_
cursor
Ref
Unref
IsShapeAvailable
XDisplayExists
IsXInput2Available
DoQuerySharedMemorySupport
QuerySharedMemorySupport
QueryRenderSupport
GetDefaultScreen
GetXCursor
ResetXCursorCache
CreateReffedCustomXCursor
RefCustomXCursor
UnrefCustomXCursor
SkBitmapToXcursorImage
CoalescePendingMotionEvents
HideHostCursor
CreateInvisibleCursor
GetX11RootWindow
GetCurrentDesktop
GetX11WindowFromGtkWidget
GetX11WindowFromGdkWindow
GetGtkWindowFromX11Window
GetVisualFromGtkWidget
SetHideTitlebarWhenMaximizedProperty
ClearX11DefaultRootWindow
IsWindowVisible
GetWindowRect
WindowContainsPoint
PropertyExists
GetRawBytesOfProperty
GetIntProperty
GetXIDProperty
GetIntArrayProperty
GetAtomArrayProperty
GetStringProperty
SetIntProperty
SetIntArrayProperty
SetAtomArrayProperty
SetStringProperty
GetAtom
SetWindowClassHint
SetWindowRole
GetParentWindow
GetHighestAncestorWindow
GetCustomFramePrefDefault
GetWindowDesktop
GetX11ErrorString
IsWindowNamed
EnumerateChildren
EnumerateAllWindows
EnumerateTopLevelWindows
GetXWindowStack
RestackWindow
AttachSharedMemory
DetachSharedMemory
CopyAreaToCanvas
CreatePictureFromSkiaPixmap
FreePicture
FreePixmap
GetWindowManagerName
GuessWindowManager
ChangeWindowDesktop
SetDefaultX11ErrorHandlers
IsX11WindowFullScreen
front
reset
display_
get
reset
GetRenderARGB32Format
GetRenderVisualFormat
SetX11ErrorHandlers
LogErrorEventDescription
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// This file defines utility functions for X11 (Linux only). This code has been
// ported from XCB since we can't use XCB on Ubuntu while its 32-bit support
// remains woefully incomplete.

#include "ui/base/x/x11_util.h"

#include <ctype.h>
#include <sys/ipc.h>
#include <sys/shm.h>

#include <list>
#include <map>
#include <utility>
#include <vector>

#include <X11/extensions/shape.h>
#include <X11/extensions/XInput2.h>

#include "base/bind.h"
#include "base/command_line.h"
#include "base/debug/trace_event.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/singleton.h"
#include "base/message_loop/message_loop.h"
#include "base/metrics/histogram.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/sys_byteorder.h"
#include "base/threading/thread.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "third_party/skia/include/core/SkPostConfig.h"
#include "ui/base/x/x11_menu_list.h"
#include "ui/base/x/x11_util_internal.h"
#include "ui/events/event_utils.h"
#include "ui/events/keycodes/keyboard_code_conversion_x.h"
#include "ui/events/x/device_data_manager.h"
#include "ui/events/x/touch_factory_x11.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/image/image_skia_rep.h"
#include "ui/gfx/point.h"
#include "ui/gfx/point_conversions.h"
#include "ui/gfx/rect.h"
#include "ui/gfx/size.h"
#include "ui/gfx/x/x11_error_tracker.h"

#if defined(OS_FREEBSD)
#include <sys/sysctl.h>
#include <sys/types.h>
#endif

#if defined(USE_AURA)
#include <X11/Xcursor/Xcursor.h>
#include "skia/ext/image_operations.h"
#include "ui/gfx/skia_util.h"
#endif

#if defined(TOOLKIT_GTK)
#include <gdk/gdk.h>
#include <gtk/gtk.h>
#include "ui/gfx/gdk_compat.h"
#include "ui/gfx/gtk_compat.h"
#endif

namespace ui {

namespace {

// Used to cache the XRenderPictFormat for a visual/display pair.
struct CachedPictFormat {
  bool equals(XDisplay* display, Visual* visual) const {
    return display == this->display && visual == this->visual;
  }

  XDisplay* display;
  Visual* visual;
  XRenderPictFormat* format;
};

typedef std::list<CachedPictFormat> CachedPictFormats;

// Returns the cache of pict formats.
CachedPictFormats* get_cached_pict_formats() {
  static CachedPictFormats* formats = NULL;
  if (!formats)
    formats = new CachedPictFormats();
  return formats;
}

// Maximum number of CachedPictFormats we keep around.
const size_t kMaxCacheSize = 5;

int DefaultX11ErrorHandler(XDisplay* d, XErrorEvent* e) {
  if (base::MessageLoop::current()) {
    base::MessageLoop::current()->PostTask(
        FROM_HERE, base::Bind(&LogErrorEventDescription, d, *e));
  } else {
    LOG(ERROR)
        << "X error received: "
        << "serial " << e->serial << ", "
        << "error_code " << static_cast<int>(e->error_code) << ", "
        << "request_code " << static_cast<int>(e->request_code) << ", "
        << "minor_code " << static_cast<int>(e->minor_code);
  }
  return 0;
}

int DefaultX11IOErrorHandler(XDisplay* d) {
  // If there's an IO error it likely means the X server has gone away
  LOG(ERROR) << "X IO error received (X server probably went away)";
  _exit(1);
}

// Note: The caller should free the resulting value data.
bool GetProperty(XID window, const std::string& property_name, long max_length,
                 Atom* type, int* format, unsigned long* num_items,
                 unsigned char** property) {
  Atom property_atom = GetAtom(property_name.c_str());
  unsigned long remaining_bytes = 0;
  return XGetWindowProperty(gfx::GetXDisplay(),
                            window,
                            property_atom,
                            0,          // offset into property data to read
                            max_length, // max length to get
                            False,      // deleted
                            AnyPropertyType,
                            type,
                            format,
                            num_items,
                            &remaining_bytes,
                            property);
}

// A process wide singleton that manages the usage of X cursors.
class XCursorCache {
 public:
  XCursorCache() {}
  ~XCursorCache() {
    Clear();
  }

  ::Cursor GetCursor(int cursor_shape) {
    // Lookup cursor by attempting to insert a null value, which avoids
    // a second pass through the map after a cache miss.
    std::pair<std::map<int, ::Cursor>::iterator, bool> it = cache_.insert(
        std::make_pair(cursor_shape, 0));
    if (it.second) {
      XDisplay* display = base::MessagePumpForUI::GetDefaultXDisplay();
      it.first->second = XCreateFontCursor(display, cursor_shape);
    }
    return it.first->second;
  }

  void Clear() {
    XDisplay* display = base::MessagePumpForUI::GetDefaultXDisplay();
    for (std::map<int, ::Cursor>::iterator it =
        cache_.begin(); it != cache_.end(); ++it) {
      XFreeCursor(display, it->second);
    }
    cache_.clear();
  }

 private:
  // Maps X11 font cursor shapes to Cursor IDs.
  std::map<int, ::Cursor> cache_;

  DISALLOW_COPY_AND_ASSIGN(XCursorCache);
};

XCursorCache* cursor_cache = NULL;

#if defined(USE_AURA)
// A process wide singleton cache for custom X cursors.
class XCustomCursorCache {
 public:
  static XCustomCursorCache* GetInstance() {
    return Singleton<XCustomCursorCache>::get();
  }

  ::Cursor InstallCustomCursor(XcursorImage* image) {
    XCustomCursor* custom_cursor = new XCustomCursor(image);
    ::Cursor xcursor = custom_cursor->cursor();
    cache_[xcursor] = custom_cursor;
    return xcursor;
  }

  void Ref(::Cursor cursor) {
    cache_[cursor]->Ref();
  }

  void Unref(::Cursor cursor) {
    if (cache_[cursor]->Unref())
      cache_.erase(cursor);
  }

  void Clear() {
    cache_.clear();
  }

 private:
  friend struct DefaultSingletonTraits<XCustomCursorCache>;

  class XCustomCursor {
   public:
    // This takes ownership of the image.
    XCustomCursor(XcursorImage* image)
        : image_(image),
          ref_(1) {
      cursor_ = XcursorImageLoadCursor(gfx::GetXDisplay(), image);
    }

    ~XCustomCursor() {
      XcursorImageDestroy(image_);
      XFreeCursor(gfx::GetXDisplay(), cursor_);
    }

    ::Cursor cursor() const { return cursor_; }

    void Ref() {
      ++ref_;
    }

    // Returns true if the cursor was destroyed because of the unref.
    bool Unref() {
      if (--ref_ == 0) {
        delete this;
        return true;
      }
      return false;
    }

   private:
    XcursorImage* image_;
    int ref_;
    ::Cursor cursor_;

    DISALLOW_COPY_AND_ASSIGN(XCustomCursor);
  };

  XCustomCursorCache() {}
  ~XCustomCursorCache() {
    Clear();
  }

  std::map< ::Cursor, XCustomCursor*> cache_;
  DISALLOW_COPY_AND_ASSIGN(XCustomCursorCache);
};
#endif  // defined(USE_AURA)

bool IsShapeAvailable() {
  int dummy;
  static bool is_shape_available =
    XShapeQueryExtension(gfx::GetXDisplay(), &dummy, &dummy);
  return is_shape_available;

}

}  // namespace

bool XDisplayExists() {
  return (gfx::GetXDisplay() != NULL);
}

bool IsXInput2Available() {
  return DeviceDataManager::GetInstance()->IsXInput2Available();
}

static SharedMemorySupport DoQuerySharedMemorySupport(XDisplay* dpy) {
  int dummy;
  Bool pixmaps_supported;
  // Query the server's support for XSHM.
  if (!XShmQueryVersion(dpy, &dummy, &dummy, &pixmaps_supported))
    return SHARED_MEMORY_NONE;

#if defined(OS_FREEBSD)
  // On FreeBSD we can't access the shared memory after it was marked for
  // deletion, unless this behaviour is explicitly enabled by the user.
  // In case it's not enabled disable shared memory support.
  int allow_removed;
  size_t length = sizeof(allow_removed);

  if ((sysctlbyname("kern.ipc.shm_allow_removed", &allow_removed, &length,
      NULL, 0) < 0) || allow_removed < 1) {
    return SHARED_MEMORY_NONE;
  }
#endif

  // Next we probe to see if shared memory will really work
  int shmkey = shmget(IPC_PRIVATE, 1, 0600);
  if (shmkey == -1) {
    LOG(WARNING) << "Failed to get shared memory segment.";
    return SHARED_MEMORY_NONE;
  } else {
    VLOG(1) << "Got shared memory segment " << shmkey;
  }

  void* address = shmat(shmkey, NULL, 0);
  // Mark the shared memory region for deletion
  shmctl(shmkey, IPC_RMID, NULL);

  XShmSegmentInfo shminfo;
  memset(&shminfo, 0, sizeof(shminfo));
  shminfo.shmid = shmkey;

  gfx::X11ErrorTracker err_tracker;
  bool result = XShmAttach(dpy, &shminfo);
  if (result)
    VLOG(1) << "X got shared memory segment " << shmkey;
  else
    LOG(WARNING) << "X failed to attach to shared memory segment " << shmkey;
  if (err_tracker.FoundNewError())
    result = false;
  shmdt(address);
  if (!result) {
    LOG(WARNING) << "X failed to attach to shared memory segment " << shmkey;
    return SHARED_MEMORY_NONE;
  }

  VLOG(1) << "X attached to shared memory segment " << shmkey;

  XShmDetach(dpy, &shminfo);
  return pixmaps_supported ? SHARED_MEMORY_PIXMAP : SHARED_MEMORY_PUTIMAGE;
}

SharedMemorySupport QuerySharedMemorySupport(XDisplay* dpy) {
  static SharedMemorySupport shared_memory_support = SHARED_MEMORY_NONE;
  static bool shared_memory_support_cached = false;

  if (shared_memory_support_cached)
    return shared_memory_support;

  shared_memory_support = DoQuerySharedMemorySupport(dpy);
  shared_memory_support_cached = true;

  return shared_memory_support;
}

bool QueryRenderSupport(XDisplay* dpy) {
  static bool render_supported = false;
  static bool render_supported_cached = false;

  if (render_supported_cached)
    return render_supported;

  // We don't care about the version of Xrender since all the features which
  // we use are included in every version.
  int dummy;
  render_supported = XRenderQueryExtension(dpy, &dummy, &dummy);
  render_supported_cached = true;

  return render_supported;
}

int GetDefaultScreen(XDisplay* display) {
  return XDefaultScreen(display);
}

::Cursor GetXCursor(int cursor_shape) {
  if (!cursor_cache)
    cursor_cache = new XCursorCache;
  return cursor_cache->GetCursor(cursor_shape);
}

void ResetXCursorCache() {
  delete cursor_cache;
  cursor_cache = NULL;
}

#if defined(USE_AURA)
::Cursor CreateReffedCustomXCursor(XcursorImage* image) {
  return XCustomCursorCache::GetInstance()->InstallCustomCursor(image);
}

void RefCustomXCursor(::Cursor cursor) {
  XCustomCursorCache::GetInstance()->Ref(cursor);
}

void UnrefCustomXCursor(::Cursor cursor) {
  XCustomCursorCache::GetInstance()->Unref(cursor);
}

XcursorImage* SkBitmapToXcursorImage(const SkBitmap* cursor_image,
                                     const gfx::Point& hotspot) {
  DCHECK(cursor_image->colorType() == kPMColor_SkColorType);
  gfx::Point hotspot_point = hotspot;
  SkBitmap scaled;

  // X11 seems to have issues with cursors when images get larger than 64
  // pixels. So rescale the image if necessary.
  const float kMaxPixel = 64.f;
  bool needs_scale = false;
  if (cursor_image->width() > kMaxPixel || cursor_image->height() > kMaxPixel) {
    float scale = 1.f;
    if (cursor_image->width() > cursor_image->height())
      scale = kMaxPixel / cursor_image->width();
    else
      scale = kMaxPixel / cursor_image->height();

    scaled = skia::ImageOperations::Resize(*cursor_image,
        skia::ImageOperations::RESIZE_BETTER,
        static_cast<int>(cursor_image->width() * scale),
        static_cast<int>(cursor_image->height() * scale));
    hotspot_point = gfx::ToFlooredPoint(gfx::ScalePoint(hotspot, scale));
    needs_scale = true;
  }

  const SkBitmap* bitmap = needs_scale ? &scaled : cursor_image;
  XcursorImage* image = XcursorImageCreate(bitmap->width(), bitmap->height());
  image->xhot = std::min(bitmap->width() - 1, hotspot_point.x());
  image->yhot = std::min(bitmap->height() - 1, hotspot_point.y());

  if (bitmap->width() && bitmap->height()) {
    bitmap->lockPixels();
    // The |bitmap| contains ARGB image, so just copy it.
    memcpy(image->pixels,
           bitmap->getPixels(),
           bitmap->width() * bitmap->height() * 4);
    bitmap->unlockPixels();
  }

  return image;
}


int CoalescePendingMotionEvents(const XEvent* xev,
                                XEvent* last_event) {
  XIDeviceEvent* xievent = static_cast<XIDeviceEvent*>(xev->xcookie.data);
  int num_coalesced = 0;
  XDisplay* display = xev->xany.display;
  int event_type = xev->xgeneric.evtype;

  DCHECK(event_type == XI_Motion || event_type == XI_TouchUpdate);

  while (XPending(display)) {
    XEvent next_event;
    XPeekEvent(display, &next_event);

    // If we can't get the cookie, abort the check.
    if (!XGetEventData(next_event.xgeneric.display, &next_event.xcookie))
      return num_coalesced;

    // If this isn't from a valid device, throw the event away, as
    // that's what the message pump would do. Device events come in pairs
    // with one from the master and one from the slave so there will
    // always be at least one pending.
    if (!ui::TouchFactory::GetInstance()->ShouldProcessXI2Event(&next_event)) {
      XFreeEventData(display, &next_event.xcookie);
      XNextEvent(display, &next_event);
      continue;
    }

    if (next_event.type == GenericEvent &&
        next_event.xgeneric.evtype == event_type &&
        !ui::DeviceDataManager::GetInstance()->IsCMTGestureEvent(
            &next_event)) {
      XIDeviceEvent* next_xievent =
          static_cast<XIDeviceEvent*>(next_event.xcookie.data);
      // Confirm that the motion event is targeted at the same window
      // and that no buttons or modifiers have changed.
      if (xievent->event == next_xievent->event &&
          xievent->child == next_xievent->child &&
          xievent->detail == next_xievent->detail &&
          xievent->buttons.mask_len == next_xievent->buttons.mask_len &&
          (memcmp(xievent->buttons.mask,
                  next_xievent->buttons.mask,
                  xievent->buttons.mask_len) == 0) &&
          xievent->mods.base == next_xievent->mods.base &&
          xievent->mods.latched == next_xievent->mods.latched &&
          xievent->mods.locked == next_xievent->mods.locked &&
          xievent->mods.effective == next_xievent->mods.effective) {
        XFreeEventData(display, &next_event.xcookie);
        // Free the previous cookie.
        if (num_coalesced > 0)
          XFreeEventData(display, &last_event->xcookie);
        // Get the event and its cookie data.
        XNextEvent(display, last_event);
        XGetEventData(display, &last_event->xcookie);
        ++num_coalesced;
        continue;
      }
    }
    // This isn't an event we want so free its cookie data.
    XFreeEventData(display, &next_event.xcookie);
    break;
  }

  if (event_type == XI_Motion && num_coalesced > 0) {
    base::TimeDelta delta = ui::EventTimeFromNative(last_event) -
        ui::EventTimeFromNative(const_cast<XEvent*>(xev));
    UMA_HISTOGRAM_COUNTS_10000("Event.CoalescedCount.Mouse", num_coalesced);
    UMA_HISTOGRAM_TIMES("Event.CoalescedLatency.Mouse", delta);
  }
  return num_coalesced;
}
#endif

void HideHostCursor() {
  CR_DEFINE_STATIC_LOCAL(XScopedCursor, invisible_cursor,
                         (CreateInvisibleCursor(), gfx::GetXDisplay()));
  XDefineCursor(gfx::GetXDisplay(), DefaultRootWindow(gfx::GetXDisplay()),
                invisible_cursor.get());
}

::Cursor CreateInvisibleCursor() {
  XDisplay* xdisplay = gfx::GetXDisplay();
  ::Cursor invisible_cursor;
  char nodata[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
  XColor black;
  black.red = black.green = black.blue = 0;
  Pixmap blank = XCreateBitmapFromData(xdisplay,
                                       DefaultRootWindow(xdisplay),
                                       nodata, 8, 8);
  invisible_cursor = XCreatePixmapCursor(xdisplay, blank, blank,
                                         &black, &black, 0, 0);
  XFreePixmap(xdisplay, blank);
  return invisible_cursor;
}

XID GetX11RootWindow() {
  return DefaultRootWindow(gfx::GetXDisplay());
}

bool GetCurrentDesktop(int* desktop) {
  return GetIntProperty(GetX11RootWindow(), "_NET_CURRENT_DESKTOP", desktop);
}

#if defined(TOOLKIT_GTK)
XID GetX11WindowFromGtkWidget(GtkWidget* widget) {
  return GDK_WINDOW_XID(gtk_widget_get_window(widget));
}

XID GetX11WindowFromGdkWindow(GdkWindow* window) {
  return GDK_WINDOW_XID(window);
}

GtkWindow* GetGtkWindowFromX11Window(XID xid) {
  GdkWindow* gdk_window =
      gdk_x11_window_lookup_for_display(gdk_display_get_default(), xid);
  if (!gdk_window)
    return NULL;
  GtkWindow* gtk_window = NULL;
  gdk_window_get_user_data(gdk_window,
                           reinterpret_cast<gpointer*>(&gtk_window));
  if (!gtk_window)
    return NULL;
  return gtk_window;
}

void* GetVisualFromGtkWidget(GtkWidget* widget) {
  return GDK_VISUAL_XVISUAL(gtk_widget_get_visual(widget));
}
#endif  // defined(TOOLKIT_GTK)

void SetHideTitlebarWhenMaximizedProperty(XID window,
                                          HideTitlebarWhenMaximized property) {
  // XChangeProperty() expects "hide" to be long.
  unsigned long hide = property;
  XChangeProperty(gfx::GetXDisplay(),
      window,
      GetAtom("_GTK_HIDE_TITLEBAR_WHEN_MAXIMIZED"),
      XA_CARDINAL,
      32,  // size in bits
      PropModeReplace,
      reinterpret_cast<unsigned char*>(&hide),
      1);
}

void ClearX11DefaultRootWindow() {
  XDisplay* display = gfx::GetXDisplay();
  XID root_window = GetX11RootWindow();
  gfx::Rect root_bounds;
  if (!GetWindowRect(root_window, &root_bounds)) {
    LOG(ERROR) << "Failed to get the bounds of the X11 root window";
    return;
  }

  XGCValues gc_values = {0};
  gc_values.foreground = BlackPixel(display, DefaultScreen(display));
  GC gc = XCreateGC(display, root_window, GCForeground, &gc_values);
  XFillRectangle(display, root_window, gc,
                 root_bounds.x(),
                 root_bounds.y(),
                 root_bounds.width(),
                 root_bounds.height());
  XFreeGC(display, gc);
}

bool IsWindowVisible(XID window) {
  TRACE_EVENT0("ui", "IsWindowVisible");

  XWindowAttributes win_attributes;
  if (!XGetWindowAttributes(gfx::GetXDisplay(), window, &win_attributes))
    return false;
  if (win_attributes.map_state != IsViewable)
    return false;

  // Minimized windows are not visible.
  std::vector<Atom> wm_states;
  if (GetAtomArrayProperty(window, "_NET_WM_STATE", &wm_states)) {
    Atom hidden_atom = GetAtom("_NET_WM_STATE_HIDDEN");
    if (std::find(wm_states.begin(), wm_states.end(), hidden_atom) !=
            wm_states.end()) {
      return false;
    }
  }

  // Some compositing window managers (notably kwin) do not actually unmap
  // windows on desktop switch, so we also must check the current desktop.
  int window_desktop, current_desktop;
  return (!GetWindowDesktop(window, &window_desktop) ||
          !GetCurrentDesktop(&current_desktop) ||
          window_desktop == kAllDesktops ||
          window_desktop == current_desktop);
}

bool GetWindowRect(XID window, gfx::Rect* rect) {
  Window root, child;
  int x, y;
  unsigned int width, height;
  unsigned int border_width, depth;

  if (!XGetGeometry(gfx::GetXDisplay(), window, &root, &x, &y,
                    &width, &height, &border_width, &depth))
    return false;

  if (!XTranslateCoordinates(gfx::GetXDisplay(), window, root,
                             0, 0, &x, &y, &child))
    return false;

  *rect = gfx::Rect(x, y, width, height);

  std::vector<int> insets;
  if (GetIntArrayProperty(window, "_NET_FRAME_EXTENTS", &insets) &&
      insets.size() == 4) {
    rect->Inset(-insets[0], -insets[2], -insets[1], -insets[3]);
  }
  // Not all window managers support _NET_FRAME_EXTENTS so return true even if
  // requesting the property fails.

  return true;
}


bool WindowContainsPoint(XID window, gfx::Point screen_loc) {
  TRACE_EVENT0("ui", "WindowContainsPoint");

  gfx::Rect window_rect;
  if (!GetWindowRect(window, &window_rect))
    return false;

  if (!window_rect.Contains(screen_loc))
    return false;

  if (!IsShapeAvailable())
    return true;

  // According to http://www.x.org/releases/X11R7.6/doc/libXext/shapelib.html,
  // if an X display supports the shape extension the bounds of a window are
  // defined as the intersection of the window bounds and the interior
  // rectangles. This means to determine if a point is inside a window for the
  // purpose of input handling we have to check the rectangles in the ShapeInput
  // list.
  // According to http://www.x.org/releases/current/doc/xextproto/shape.html,
  // we need to also respect the ShapeBounding rectangles.
  // The effective input region of a window is defined to be the intersection
  // of the client input region with both the default input region and the
  // client bounding region. Any portion of the client input region that is not
  // included in both the default input region and the client bounding region
  // will not be included in the effective input region on the screen.
  int rectangle_kind[] = {ShapeInput, ShapeBounding};
  for (size_t kind_index = 0;
       kind_index < arraysize(rectangle_kind);
       kind_index++) {
    int dummy;
    int shape_rects_size = 0;
    XRectangle* shape_rects = XShapeGetRectangles(gfx::GetXDisplay(),
                                                  window,
                                                  rectangle_kind[kind_index],
                                                  &shape_rects_size,
                                                  &dummy);
    if (!shape_rects)
      continue;
    bool is_in_shape_rects = false;
    for (int i = 0; i < shape_rects_size; ++i) {
      // The ShapeInput and ShapeBounding rects are to be in window space, so we
      // have to translate by the window_rect's offset to map to screen space.
      gfx::Rect shape_rect =
          gfx::Rect(shape_rects[i].x + window_rect.x(),
                    shape_rects[i].y + window_rect.y(),
                    shape_rects[i].width, shape_rects[i].height);
      if (shape_rect.Contains(screen_loc)) {
        is_in_shape_rects = true;
        break;
      }
    }
    XFree(shape_rects);
    if (!is_in_shape_rects)
      return false;
  }
  return true;
}


bool PropertyExists(XID window, const std::string& property_name) {
  Atom type = None;
  int format = 0;  // size in bits of each item in 'property'
  unsigned long num_items = 0;
  unsigned char* property = NULL;

  int result = GetProperty(window, property_name, 1,
                           &type, &format, &num_items, &property);
  if (result != Success)
    return false;

  XFree(property);
  return num_items > 0;
}

bool GetRawBytesOfProperty(XID window,
                           Atom property,
                           scoped_refptr<base::RefCountedMemory>* out_data,
                           size_t* out_data_bytes,
                           size_t* out_data_items,
                           Atom* out_type) {
  // Retrieve the data from our window.
  unsigned long nitems = 0;
  unsigned long nbytes = 0;
  Atom prop_type = None;
  int prop_format = 0;
  unsigned char* property_data = NULL;
  if (XGetWindowProperty(gfx::GetXDisplay(), window, property,
                         0, 0x1FFFFFFF /* MAXINT32 / 4 */, False,
                         AnyPropertyType, &prop_type, &prop_format,
                         &nitems, &nbytes, &property_data) != Success) {
    return false;
  }

  if (prop_type == None)
    return false;

  size_t bytes = 0;
  // So even though we should theoretically have nbytes (and we can't
  // pass NULL there), we need to manually calculate the byte length here
  // because nbytes always returns zero.
  switch (prop_format) {
    case 8:
      bytes = nitems;
      break;
    case 16:
      bytes = sizeof(short) * nitems;
      break;
    case 32:
      bytes = sizeof(long) * nitems;
      break;
    default:
      NOTREACHED();
      break;
  }

  if (out_data_bytes)
    *out_data_bytes = bytes;

  if (out_data)
    *out_data = new XRefcountedMemory(property_data, bytes);
  else
    XFree(property_data);

  if (out_data_items)
    *out_data_items = nitems;

  if (out_type)
    *out_type = prop_type;

  return true;
}

bool GetIntProperty(XID window, const std::string& property_name, int* value) {
  Atom type = None;
  int format = 0;  // size in bits of each item in 'property'
  unsigned long num_items = 0;
  unsigned char* property = NULL;

  int result = GetProperty(window, property_name, 1,
                           &type, &format, &num_items, &property);
  if (result != Success)
    return false;

  if (format != 32 || num_items != 1) {
    XFree(property);
    return false;
  }

  *value = static_cast<int>(*(reinterpret_cast<long*>(property)));
  XFree(property);
  return true;
}

bool GetXIDProperty(XID window, const std::string& property_name, XID* value) {
  Atom type = None;
  int format = 0;  // size in bits of each item in 'property'
  unsigned long num_items = 0;
  unsigned char* property = NULL;

  int result = GetProperty(window, property_name, 1,
                           &type, &format, &num_items, &property);
  if (result != Success)
    return false;

  if (format != 32 || num_items != 1) {
    XFree(property);
    return false;
  }

  *value = *(reinterpret_cast<XID*>(property));
  XFree(property);
  return true;
}

bool GetIntArrayProperty(XID window,
                         const std::string& property_name,
                         std::vector<int>* value) {
  Atom type = None;
  int format = 0;  // size in bits of each item in 'property'
  unsigned long num_items = 0;
  unsigned char* properties = NULL;

  int result = GetProperty(window, property_name,
                           (~0L), // (all of them)
                           &type, &format, &num_items, &properties);
  if (result != Success)
    return false;

  if (format != 32) {
    XFree(properties);
    return false;
  }

  long* int_properties = reinterpret_cast<long*>(properties);
  value->clear();
  for (unsigned long i = 0; i < num_items; ++i) {
    value->push_back(static_cast<int>(int_properties[i]));
  }
  XFree(properties);
  return true;
}

bool GetAtomArrayProperty(XID window,
                          const std::string& property_name,
                          std::vector<Atom>* value) {
  Atom type = None;
  int format = 0;  // size in bits of each item in 'property'
  unsigned long num_items = 0;
  unsigned char* properties = NULL;

  int result = GetProperty(window, property_name,
                           (~0L), // (all of them)
                           &type, &format, &num_items, &properties);
  if (result != Success)
    return false;

  if (type != XA_ATOM) {
    XFree(properties);
    return false;
  }

  Atom* atom_properties = reinterpret_cast<Atom*>(properties);
  value->clear();
  value->insert(value->begin(), atom_properties, atom_properties + num_items);
  XFree(properties);
  return true;
}

bool GetStringProperty(
    XID window, const std::string& property_name, std::string* value) {
  Atom type = None;
  int format = 0;  // size in bits of each item in 'property'
  unsigned long num_items = 0;
  unsigned char* property = NULL;

  int result = GetProperty(window, property_name, 1024,
                           &type, &format, &num_items, &property);
  if (result != Success)
    return false;

  if (format != 8) {
    XFree(property);
    return false;
  }

  value->assign(reinterpret_cast<char*>(property), num_items);
  XFree(property);
  return true;
}

bool SetIntProperty(XID window,
                    const std::string& name,
                    const std::string& type,
                    int value) {
  std::vector<int> values(1, value);
  return SetIntArrayProperty(window, name, type, values);
}

bool SetIntArrayProperty(XID window,
                         const std::string& name,
                         const std::string& type,
                         const std::vector<int>& value) {
  DCHECK(!value.empty());
  Atom name_atom = GetAtom(name.c_str());
  Atom type_atom = GetAtom(type.c_str());

  // XChangeProperty() expects values of type 32 to be longs.
  scoped_ptr<long[]> data(new long[value.size()]);
  for (size_t i = 0; i < value.size(); ++i)
    data[i] = value[i];

  gfx::X11ErrorTracker err_tracker;
  XChangeProperty(gfx::GetXDisplay(),
                  window,
                  name_atom,
                  type_atom,
                  32,  // size in bits of items in 'value'
                  PropModeReplace,
                  reinterpret_cast<const unsigned char*>(data.get()),
                  value.size());  // num items
  return !err_tracker.FoundNewError();
}

bool SetAtomArrayProperty(XID window,
                          const std::string& name,
                          const std::string& type,
                          const std::vector<Atom>& value) {
  DCHECK(!value.empty());
  Atom name_atom = GetAtom(name.c_str());
  Atom type_atom = GetAtom(type.c_str());

  // XChangeProperty() expects values of type 32 to be longs.
  scoped_ptr<Atom[]> data(new Atom[value.size()]);
  for (size_t i = 0; i < value.size(); ++i)
    data[i] = value[i];

  gfx::X11ErrorTracker err_tracker;
  XChangeProperty(gfx::GetXDisplay(),
                  window,
                  name_atom,
                  type_atom,
                  32,  // size in bits of items in 'value'
                  PropModeReplace,
                  reinterpret_cast<const unsigned char*>(data.get()),
                  value.size());  // num items
  return !err_tracker.FoundNewError();
}

bool SetStringProperty(XID window,
                       Atom property,
                       Atom type,
                       const std::string& value) {
  gfx::X11ErrorTracker err_tracker;
  XChangeProperty(gfx::GetXDisplay(),
                  window,
                  property,
                  type,
                  8,
                  PropModeReplace,
                  reinterpret_cast<const unsigned char*>(value.c_str()),
                  value.size());
  return !err_tracker.FoundNewError();
}

Atom GetAtom(const char* name) {
#if defined(TOOLKIT_GTK)
  return gdk_x11_get_xatom_by_name_for_display(
      gdk_display_get_default(), name);
#else
  // TODO(derat): Cache atoms to avoid round-trips to the server.
  return XInternAtom(gfx::GetXDisplay(), name, false);
#endif
}

void SetWindowClassHint(XDisplay* display,
                        XID window,
                        const std::string& res_name,
                        const std::string& res_class) {
  XClassHint class_hints;
  // const_cast is safe because XSetClassHint does not modify the strings.
  // Just to be safe, the res_name and res_class parameters are local copies,
  // not const references.
  class_hints.res_name = const_cast<char*>(res_name.c_str());
  class_hints.res_class = const_cast<char*>(res_class.c_str());
  XSetClassHint(display, window, &class_hints);
}

void SetWindowRole(XDisplay* display, XID window, const std::string& role) {
  if (role.empty()) {
    XDeleteProperty(display, window, GetAtom("WM_WINDOW_ROLE"));
  } else {
    char* role_c = const_cast<char*>(role.c_str());
    XChangeProperty(display, window, GetAtom("WM_WINDOW_ROLE"), XA_STRING, 8,
                    PropModeReplace,
                    reinterpret_cast<unsigned char*>(role_c),
                    role.size());
  }
}

XID GetParentWindow(XID window) {
  XID root = None;
  XID parent = None;
  XID* children = NULL;
  unsigned int num_children = 0;
  XQueryTree(gfx::GetXDisplay(), window, &root, &parent, &children, &num_children);
  if (children)
    XFree(children);
  return parent;
}

XID GetHighestAncestorWindow(XID window, XID root) {
  while (true) {
    XID parent = GetParentWindow(window);
    if (parent == None)
      return None;
    if (parent == root)
      return window;
    window = parent;
  }
}

bool GetCustomFramePrefDefault() {
  // Ideally, we'd use the custom frame by default and just fall back on using
  // system decorations for the few (?) tiling window managers where the custom
  // frame doesn't make sense (e.g. awesome, ion3, ratpoison, xmonad, etc.) or
  // other WMs where it has issues (e.g. Fluxbox -- see issue 19130).  The EWMH
  // _NET_SUPPORTING_WM property makes it easy to look up a name for the current
  // WM, but at least some of the WMs in the latter group don't set it.
  // Instead, we default to using system decorations for all WMs and
  // special-case the ones where the custom frame should be used.
  ui::WindowManagerName wm_type = GuessWindowManager();
  return (wm_type == WM_BLACKBOX ||
          wm_type == WM_COMPIZ ||
          wm_type == WM_ENLIGHTENMENT ||
          wm_type == WM_METACITY ||
          wm_type == WM_MUFFIN ||
          wm_type == WM_MUTTER ||
          wm_type == WM_OPENBOX ||
          wm_type == WM_XFWM4);
}

bool GetWindowDesktop(XID window, int* desktop) {
  return GetIntProperty(window, "_NET_WM_DESKTOP", desktop);
}

std::string GetX11ErrorString(XDisplay* display, int err) {
  char buffer[256];
  XGetErrorText(display, err, buffer, arraysize(buffer));
  return buffer;
}

// Returns true if |window| is a named window.
bool IsWindowNamed(XID window) {
  XTextProperty prop;
  if (!XGetWMName(gfx::GetXDisplay(), window, &prop) || !prop.value)
    return false;

  XFree(prop.value);
  return true;
}

bool EnumerateChildren(EnumerateWindowsDelegate* delegate, XID window,
                       const int max_depth, int depth) {
  if (depth > max_depth)
    return false;

  std::vector<XID> windows;
  std::vector<XID>::iterator iter;
  if (depth == 0) {
    XMenuList::GetInstance()->InsertMenuWindowXIDs(&windows);
    // Enumerate the menus first.
    for (iter = windows.begin(); iter != windows.end(); iter++) {
      if (delegate->ShouldStopIterating(*iter))
        return true;
    }
    windows.clear();
  }

  XID root, parent, *children;
  unsigned int num_children;
  int status = XQueryTree(gfx::GetXDisplay(), window, &root, &parent, &children,
                          &num_children);
  if (status == 0)
    return false;

  for (int i = static_cast<int>(num_children) - 1; i >= 0; i--)
    windows.push_back(children[i]);

  XFree(children);

  // XQueryTree returns the children of |window| in bottom-to-top order, so
  // reverse-iterate the list to check the windows from top-to-bottom.
  for (iter = windows.begin(); iter != windows.end(); iter++) {
    if (IsWindowNamed(*iter) && delegate->ShouldStopIterating(*iter))
      return true;
  }

  // If we're at this point, we didn't find the window we're looking for at the
  // current level, so we need to recurse to the next level.  We use a second
  // loop because the recursion and call to XQueryTree are expensive and is only
  // needed for a small number of cases.
  if (++depth <= max_depth) {
    for (iter = windows.begin(); iter != windows.end(); iter++) {
      if (EnumerateChildren(delegate, *iter, max_depth, depth))
        return true;
    }
  }

  return false;
}

bool EnumerateAllWindows(EnumerateWindowsDelegate* delegate, int max_depth) {
  XID root = GetX11RootWindow();
  return EnumerateChildren(delegate, root, max_depth, 0);
}

void EnumerateTopLevelWindows(ui::EnumerateWindowsDelegate* delegate) {
  std::vector<XID> stack;
  if (!ui::GetXWindowStack(ui::GetX11RootWindow(), &stack)) {
    // Window Manager doesn't support _NET_CLIENT_LIST_STACKING, so fall back
    // to old school enumeration of all X windows.  Some WMs parent 'top-level'
    // windows in unnamed actual top-level windows (ion WM), so extend the
    // search depth to all children of top-level windows.
    const int kMaxSearchDepth = 1;
    ui::EnumerateAllWindows(delegate, kMaxSearchDepth);
    return;
  }
  XMenuList::GetInstance()->InsertMenuWindowXIDs(&stack);

  std::vector<XID>::iterator iter;
  for (iter = stack.begin(); iter != stack.end(); iter++) {
    if (delegate->ShouldStopIterating(*iter))
      return;
  }
}

bool GetXWindowStack(Window window, std::vector<XID>* windows) {
  windows->clear();

  Atom type;
  int format;
  unsigned long count;
  unsigned char *data = NULL;
  if (GetProperty(window,
                  "_NET_CLIENT_LIST_STACKING",
                  ~0L,
                  &type,
                  &format,
                  &count,
                  &data) != Success) {
    return false;
  }

  bool result = false;
  if (type == XA_WINDOW && format == 32 && data && count > 0) {
    result = true;
    XID* stack = reinterpret_cast<XID*>(data);
    for (long i = static_cast<long>(count) - 1; i >= 0; i--)
      windows->push_back(stack[i]);
  }

  if (data)
    XFree(data);

  return result;
}

void RestackWindow(XID window, XID sibling, bool above) {
  XWindowChanges changes;
  changes.sibling = sibling;
  changes.stack_mode = above ? Above : Below;
  XConfigureWindow(gfx::GetXDisplay(), window, CWSibling | CWStackMode, &changes);
}

XSharedMemoryId AttachSharedMemory(XDisplay* display, int shared_memory_key) {
  DCHECK(QuerySharedMemorySupport(display));

  XShmSegmentInfo shminfo;
  memset(&shminfo, 0, sizeof(shminfo));
  shminfo.shmid = shared_memory_key;

  // This function is only called if QuerySharedMemorySupport returned true. In
  // which case we've already succeeded in having the X server attach to one of
  // our shared memory segments.
  if (!XShmAttach(display, &shminfo)) {
    LOG(WARNING) << "X failed to attach to shared memory segment "
                 << shminfo.shmid;
    NOTREACHED();
  } else {
    VLOG(1) << "X attached to shared memory segment " << shminfo.shmid;
  }

  return shminfo.shmseg;
}

void DetachSharedMemory(XDisplay* display, XSharedMemoryId shmseg) {
  DCHECK(QuerySharedMemorySupport(display));

  XShmSegmentInfo shminfo;
  memset(&shminfo, 0, sizeof(shminfo));
  shminfo.shmseg = shmseg;

  if (!XShmDetach(display, &shminfo))
    NOTREACHED();
}

bool CopyAreaToCanvas(XID drawable,
                      gfx::Rect source_bounds,
                      gfx::Point dest_offset,
                      gfx::Canvas* canvas) {
  ui::XScopedImage scoped_image(
      XGetImage(gfx::GetXDisplay(), drawable,
                source_bounds.x(), source_bounds.y(),
                source_bounds.width(), source_bounds.height(),
                AllPlanes, ZPixmap));
  XImage* image = scoped_image.get();
  if (!image) {
    LOG(ERROR) << "XGetImage failed";
    return false;
  }

  if (image->bits_per_pixel == 32) {
    if ((0xff << SK_R32_SHIFT) != image->red_mask ||
        (0xff << SK_G32_SHIFT) != image->green_mask ||
        (0xff << SK_B32_SHIFT) != image->blue_mask) {
      LOG(WARNING) << "XImage and Skia byte orders differ";
      return false;
    }

    // Set the alpha channel before copying to the canvas.  Otherwise, areas of
    // the framebuffer that were cleared by ply-image rather than being obscured
    // by an image during boot may end up transparent.
    // TODO(derat|marcheu): Remove this if/when ply-image has been updated to
    // set the framebuffer's alpha channel regardless of whether the device
    // claims to support alpha or not.
    for (int i = 0; i < image->width * image->height * 4; i += 4)
      image->data[i + 3] = 0xff;

    SkBitmap bitmap;
    bitmap.installPixels(SkImageInfo::MakeN32Premul(image->width,
                                                    image->height),
                         image->data, image->bytes_per_line);
    gfx::ImageSkia image_skia;
    gfx::ImageSkiaRep image_rep(bitmap, canvas->image_scale());
    image_skia.AddRepresentation(image_rep);
    canvas->DrawImageInt(image_skia, dest_offset.x(), dest_offset.y());
  } else {
    NOTIMPLEMENTED() << "Unsupported bits-per-pixel " << image->bits_per_pixel;
    return false;
  }

  return true;
}

XID CreatePictureFromSkiaPixmap(XDisplay* display, XID pixmap) {
  XID picture = XRenderCreatePicture(
      display, pixmap, GetRenderARGB32Format(display), 0, NULL);

  return picture;
}

void FreePicture(XDisplay* display, XID picture) {
  XRenderFreePicture(display, picture);
}

void FreePixmap(XDisplay* display, XID pixmap) {
  XFreePixmap(display, pixmap);
}

bool GetWindowManagerName(std::string* wm_name) {
  DCHECK(wm_name);
  int wm_window = 0;
  if (!GetIntProperty(GetX11RootWindow(),
                      "_NET_SUPPORTING_WM_CHECK",
                      &wm_window)) {
    return false;
  }

  // It's possible that a window manager started earlier in this X session left
  // a stale _NET_SUPPORTING_WM_CHECK property when it was replaced by a
  // non-EWMH window manager, so we trap errors in the following requests to
  // avoid crashes (issue 23860).

  // EWMH requires the supporting-WM window to also have a
  // _NET_SUPPORTING_WM_CHECK property pointing to itself (to avoid a stale
  // property referencing an ID that's been recycled for another window), so we
  // check that too.
  gfx::X11ErrorTracker err_tracker;
  int wm_window_property = 0;
  bool result = GetIntProperty(
      wm_window, "_NET_SUPPORTING_WM_CHECK", &wm_window_property);
  if (err_tracker.FoundNewError() || !result ||
      wm_window_property != wm_window) {
    return false;
  }

  result = GetStringProperty(
      static_cast<XID>(wm_window), "_NET_WM_NAME", wm_name);
  return !err_tracker.FoundNewError() && result;
}

WindowManagerName GuessWindowManager() {
  std::string name;
  if (GetWindowManagerName(&name)) {
    // These names are taken from the WMs' source code.
    if (name == "Blackbox")
      return WM_BLACKBOX;
    if (name == "chromeos-wm")
      return WM_CHROME_OS;
    if (name == "Compiz" || name == "compiz")
      return WM_COMPIZ;
    if (name == "e16")
      return WM_ENLIGHTENMENT;
    if (StartsWithASCII(name, "IceWM", true))
      return WM_ICE_WM;
    if (name == "KWin")
      return WM_KWIN;
    if (name == "Metacity")
      return WM_METACITY;
    if (name == "Mutter (Muffin)")
      return WM_MUFFIN;
    if (name == "GNOME Shell")
      return WM_MUTTER; // GNOME Shell uses Mutter
    if (name == "Mutter")
      return WM_MUTTER;
    if (name == "Openbox")
      return WM_OPENBOX;
    if (name == "Xfwm4")
      return WM_XFWM4;
  }
  return WM_UNKNOWN;
}

bool ChangeWindowDesktop(XID window, XID destination) {
  int desktop;
  if (!GetWindowDesktop(destination, &desktop))
    return false;

  // If |window| is sticky, use the current desktop.
  if (desktop == kAllDesktops &&
      !GetCurrentDesktop(&desktop))
    return false;

  XEvent event;
  event.xclient.type = ClientMessage;
  event.xclient.window = window;
  event.xclient.message_type = GetAtom("_NET_WM_DESKTOP");
  event.xclient.format = 32;
  event.xclient.data.l[0] = desktop;
  event.xclient.data.l[1] = 1;  // source indication

  int result = XSendEvent(gfx::GetXDisplay(), GetX11RootWindow(), False,
                          SubstructureNotifyMask, &event);
  return result == Success;
}

void SetDefaultX11ErrorHandlers() {
  SetX11ErrorHandlers(NULL, NULL);
}

bool IsX11WindowFullScreen(XID window) {
  // If _NET_WM_STATE_FULLSCREEN is in _NET_SUPPORTED, use the presence or
  // absence of _NET_WM_STATE_FULLSCREEN in _NET_WM_STATE to determine
  // whether we're fullscreen.
  std::vector<Atom> supported_atoms;
  if (GetAtomArrayProperty(GetX11RootWindow(),
                           "_NET_SUPPORTED",
                           &supported_atoms)) {
    Atom atom = GetAtom("_NET_WM_STATE_FULLSCREEN");

    if (std::find(supported_atoms.begin(), supported_atoms.end(), atom)
        != supported_atoms.end()) {
      std::vector<Atom> atom_properties;
      if (GetAtomArrayProperty(window,
                               "_NET_WM_STATE",
                               &atom_properties)) {
        return std::find(atom_properties.begin(), atom_properties.end(), atom)
            != atom_properties.end();
      }
    }
  }

  gfx::Rect window_rect;
  if (!ui::GetWindowRect(window, &window_rect))
    return false;

#if defined(TOOLKIT_GTK)
  // As the last resort, check if the window size is as large as the main
  // screen.
  GdkRectangle monitor_rect;
  gdk_screen_get_monitor_geometry(gdk_screen_get_default(), 0, &monitor_rect);

  return monitor_rect.x == window_rect.x() &&
         monitor_rect.y == window_rect.y() &&
         monitor_rect.width == window_rect.width() &&
         monitor_rect.height == window_rect.height();
#else
  // We can't use gfx::Screen here because we don't have an aura::Window. So
  // instead just look at the size of the default display.
  //
  // TODO(erg): Actually doing this correctly would require pulling out xrandr,
  // which we don't even do in the desktop screen yet.
  ::XDisplay* display = gfx::GetXDisplay();
  ::Screen* screen = DefaultScreenOfDisplay(display);
  int width = WidthOfScreen(screen);
  int height = HeightOfScreen(screen);
  return window_rect.size() == gfx::Size(width, height);
#endif
}

const unsigned char* XRefcountedMemory::front() const {
  return x11_data_;
}

size_t XRefcountedMemory::size() const {
  return length_;
}

XRefcountedMemory::~XRefcountedMemory() {
  XFree(x11_data_);
}

XScopedString::~XScopedString() {
  XFree(string_);
}

XScopedImage::~XScopedImage() {
  reset(NULL);
}

void XScopedImage::reset(XImage* image) {
  if (image_ == image)
    return;
  if (image_)
    XDestroyImage(image_);
  image_ = image;
}

XScopedCursor::XScopedCursor(::Cursor cursor, XDisplay* display)
    : cursor_(cursor),
      display_(display) {
}

XScopedCursor::~XScopedCursor() {
  reset(0U);
}

::Cursor XScopedCursor::get() const {
  return cursor_;
}

void XScopedCursor::reset(::Cursor cursor) {
  if (cursor_)
    XFreeCursor(display_, cursor_);
  cursor_ = cursor;
}

// ----------------------------------------------------------------------------
// These functions are declared in x11_util_internal.h because they require
// XLib.h to be included, and it conflicts with many other headers.
XRenderPictFormat* GetRenderARGB32Format(XDisplay* dpy) {
  static XRenderPictFormat* pictformat = NULL;
  if (pictformat)
    return pictformat;

  // First look for a 32-bit format which ignores the alpha value
  XRenderPictFormat templ;
  templ.depth = 32;
  templ.type = PictTypeDirect;
  templ.direct.red = 16;
  templ.direct.green = 8;
  templ.direct.blue = 0;
  templ.direct.redMask = 0xff;
  templ.direct.greenMask = 0xff;
  templ.direct.blueMask = 0xff;
  templ.direct.alphaMask = 0;

  static const unsigned long kMask =
    PictFormatType | PictFormatDepth |
    PictFormatRed | PictFormatRedMask |
    PictFormatGreen | PictFormatGreenMask |
    PictFormatBlue | PictFormatBlueMask |
    PictFormatAlphaMask;

  pictformat = XRenderFindFormat(dpy, kMask, &templ, 0 /* first result */);

  if (!pictformat) {
    // Not all X servers support xRGB32 formats. However, the XRENDER spec says
    // that they must support an ARGB32 format, so we can always return that.
    pictformat = XRenderFindStandardFormat(dpy, PictStandardARGB32);
    CHECK(pictformat) << "XRENDER ARGB32 not supported.";
  }

  return pictformat;
}

XRenderPictFormat* GetRenderVisualFormat(XDisplay* dpy, Visual* visual) {
  DCHECK(QueryRenderSupport(dpy));

  CachedPictFormats* formats = get_cached_pict_formats();

  for (CachedPictFormats::const_iterator i = formats->begin();
       i != formats->end(); ++i) {
    if (i->equals(dpy, visual))
      return i->format;
  }

  // Not cached, look up the value.
  XRenderPictFormat* pictformat = XRenderFindVisualFormat(dpy, visual);
  CHECK(pictformat) << "XRENDER does not support default visual";

  // And store it in the cache.
  CachedPictFormat cached_value;
  cached_value.visual = visual;
  cached_value.display = dpy;
  cached_value.format = pictformat;
  formats->push_front(cached_value);

  if (formats->size() == kMaxCacheSize) {
    formats->pop_back();
    // We should really only have at most 2 display/visual combinations:
    // one for normal browser windows, and possibly another for an argb window
    // created to display a menu.
    //
    // If we get here it's not fatal, we just need to make sure we aren't
    // always blowing away the cache. If we are, then we should figure out why
    // and make it bigger.
    NOTREACHED();
  }

  return pictformat;
}

void SetX11ErrorHandlers(XErrorHandler error_handler,
                         XIOErrorHandler io_error_handler) {
  XSetErrorHandler(error_handler ? error_handler : DefaultX11ErrorHandler);
  XSetIOErrorHandler(
      io_error_handler ? io_error_handler : DefaultX11IOErrorHandler);
}

void LogErrorEventDescription(XDisplay* dpy,
                              const XErrorEvent& error_event) {
  char error_str[256];
  char request_str[256];

  XGetErrorText(dpy, error_event.error_code, error_str, sizeof(error_str));

  strncpy(request_str, "Unknown", sizeof(request_str));
  if (error_event.request_code < 128) {
    std::string num = base::UintToString(error_event.request_code);
    XGetErrorDatabaseText(
        dpy, "XRequest", num.c_str(), "Unknown", request_str,
        sizeof(request_str));
  } else {
    int num_ext;
    char** ext_list = XListExtensions(dpy, &num_ext);

    for (int i = 0; i < num_ext; i++) {
      int ext_code, first_event, first_error;
      XQueryExtension(dpy, ext_list[i], &ext_code, &first_event, &first_error);
      if (error_event.request_code == ext_code) {
        std::string msg = base::StringPrintf(
            "%s.%d", ext_list[i], error_event.minor_code);
        XGetErrorDatabaseText(
            dpy, "XRequest", msg.c_str(), "Unknown", request_str,
            sizeof(request_str));
        break;
      }
    }
    XFreeExtensionList(ext_list);
  }

  LOG(WARNING)
      << "X error received: "
      << "serial " << error_event.serial << ", "
      << "error_code " << static_cast<int>(error_event.error_code)
      << " (" << error_str << "), "
      << "request_code " << static_cast<int>(error_event.request_code) << ", "
      << "minor_code " << static_cast<int>(error_event.minor_code)
      << " (" << request_str << ")";
}

// ----------------------------------------------------------------------------
// End of x11_util_internal.h


}  // namespace ui
/* [<][>][^][v][top][bottom][index][help] */
root/ui/base/x/x11_util.cc

DEFINITIONS
