Use a default mouse cursor if XFixes is not supported.

webrtc/modules/desktop_capture/mouse_cursor_monitor_x11.cc

 /*
  *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 79 matching lines @@
 
 MouseCursorMonitorX11::MouseCursorMonitorX11(
     const DesktopCaptureOptions& options,
     Window window)
     : x_display_(options.x_display()),
       callback_(NULL),
       mode_(SHAPE_AND_POSITION),
       window_(window),
       have_xfixes_(false),
       xfixes_event_base_(-1),
-      xfixes_error_base_(-1) {}
+      xfixes_error_base_(-1) {
+  // Set a default initial cursor shape in case XFixes is not present.
+  const int kSize = 5;
+  std::unique_ptr<DesktopFrame> default_cursor(
+      new BasicDesktopFrame(DesktopSize(kSize, kSize)));
+  const uint8_t pixels[kSize * kSize] = {
+    0x00, 0x00, 0x00, 0x00, 0x00,
+    0x00, 0xff, 0xff, 0xff, 0x00,
+    0x00, 0xff, 0xff, 0xff, 0x00,
+    0x00, 0xff, 0xff, 0xff, 0x00,
+    0x00, 0x00, 0x00, 0x00, 0x00
+  };
+  uint8_t* ptr = default_cursor->data();
+  for (int y = 0; y < kSize; ++y) {
+    for (int x = 0; x < kSize; ++x) {
+      *ptr++ = pixels[kSize * y + x];
+      *ptr++ = pixels[kSize * y + x];
+      *ptr++ = pixels[kSize * y + x];
+      *ptr++ = 0xff;
+    }
+  }
+  DesktopVector hotspot(2, 2);
+  cursor_shape_.reset(new MouseCursor(default_cursor.release(), hotspot));
+}
 
 MouseCursorMonitorX11::~MouseCursorMonitorX11() {
   if (have_xfixes_) {
     x_display_->RemoveEventHandler(xfixes_event_base_ + XFixesCursorNotify,
                                    this);
   }
 }
 
 void MouseCursorMonitorX11::Init(Callback* callback, Mode mode) {
   // Init can be called only once per instance of MouseCursorMonitor.
@@ skipping 113 matching lines @@
 MouseCursorMonitor* MouseCursorMonitor::CreateForScreen(
     const DesktopCaptureOptions& options,
     ScreenId screen) {
   if (!options.x_display())
     return NULL;
   return new MouseCursorMonitorX11(
       options, DefaultRootWindow(options.x_display()->display()));
 }
 
 }  // namespace webrtc