commit 21007ee7f9572fd20ce1d798780f856dba8d9b91
author Zijie He <zijiehe@chromium.org> Thu Aug 10 18:58:34 2017
committer Commit Bot <commit-bot@chromium.org> Fri Aug 11 01:00:40 2017
tree da0fe0cae5082ebd173579138363928be269cab8
parent aa687208a833f3ef9232512688c60d6a686e3ae2

Implement GetWindowList() on X11

This change implements GetWindowList() on X11. WindowCapturerLinux and
GetWindowUnderPoint() can share the logic of this function.

Bug: webrtc:7950
Change-Id: Ida746840d6f51d31e0470e5ae4955b6f5a4cfaf2
Reviewed-on: https://chromium-review.googlesource.com/606560
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Commit-Queue: Zijie He <zijiehe@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#19314}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: ad501d19881fd06a622980fd1d27f95ba89f3348

modules/desktop_capture/x11/x_atom_cache.cc

diff --git a/modules/desktop_capture/x11/x_atom_cache.cc b/modules/desktop_capture/x11/x_atom_cache.cc
new file mode 100644
index 0000000..161c8e9
--- /dev/null
+++ b/modules/desktop_capture/x11/x_atom_cache.cc
@@ -0,0 +1,47 @@
+/*
+ *  Copyright (c) 2017 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.
+ */
+
+#include "webrtc/modules/desktop_capture/x11/x_atom_cache.h"
+
+#include "webrtc/rtc_base/checks.h"
+
+namespace webrtc {
+
+XAtomCache::XAtomCache(::Display* display) : display_(display) {
+  RTC_DCHECK(display_);
+}
+
+XAtomCache::~XAtomCache() = default;
+
+::Display* XAtomCache::display() const {
+  return display_;
+}
+
+Atom XAtomCache::WmState() {
+  return CreateIfNotExist(&wm_state_, "WM_STATE");
+}
+
+Atom XAtomCache::WindowType() {
+  return CreateIfNotExist(&window_type_, "_NET_WM_WINDOW_TYPE");
+}
+
+Atom XAtomCache::WindowTypeNormal() {
+  return CreateIfNotExist(&window_type_normal_, "_NET_WM_WINDOW_TYPE_NORMAL");
+}
+
+Atom XAtomCache::CreateIfNotExist(Atom* atom, const char* name) {
+  RTC_DCHECK(atom);
+  if (*atom == None) {
+    *atom = XInternAtom(display(), name, True);
+  }
+  return *atom;
+}
+
+}  // namespace webrtc