[DesktopCapture] Detect screen resolution changes in DirectX capturer
This change adds a ResolutionChangeDetector to help dxgi components, say
DxgiDuplicatorController and DxgiTexture to detect resolution changes.
BUG=684162
Review-Url: https://codereview.webrtc.org/2682913002
Cr-Original-Commit-Position: refs/heads/master@{#16654}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 5fea5fb1836076d5df22a1f869ac8484d3b7dad0
diff --git a/modules/desktop_capture/resolution_change_detector.cc b/modules/desktop_capture/resolution_change_detector.cc
new file mode 100644
index 0000000..f61a535
--- /dev/null
+++ b/modules/desktop_capture/resolution_change_detector.cc
@@ -0,0 +1,29 @@
+/*
+ * 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/resolution_change_detector.h"
+
+namespace webrtc {
+
+bool ResolutionChangeDetector::IsChanged(DesktopSize size) {
+ if (!initialized_) {
+ initialized_ = true;
+ last_size_ = size;
+ return false;
+ }
+
+ return !last_size_.equals(size);
+}
+
+void ResolutionChangeDetector::Reset() {
+ initialized_ = false;
+}
+
+} // namespace webrtc
