Reland of [WebRTC] A real ScreenCapturer test

webrtc/modules/desktop_capture/rgba_color.cc

Index: webrtc/modules/desktop_capture/rgba_color.cc
diff --git a/webrtc/modules/desktop_capture/rgba_color.cc b/webrtc/modules/desktop_capture/rgba_color.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2342b46915061a62926149c8464f7ed0590eec44
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+++ b/webrtc/modules/desktop_capture/rgba_color.cc
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+/*
+ *  Copyright (c) 2016 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/rgba_color.h"
+
+namespace webrtc {
+
+namespace {
+
+bool AlphaEquals(uint8_t i, uint8_t j) {
+  // On Linux and Windows 8 or early version, '0' was returned for alpha channel
+  // from capturer APIs, on Windows 10, '255' was returned. So a workaround is
+  // to treat 0 as 255.
+  return i == j || ((i == 0 || i == 255) && (j == 0 || j == 255));
+}
+
+}  // namespace
+
+RgbaColor::RgbaColor(uint8_t blue, uint8_t green, uint8_t red, uint8_t alpha) {
+  this->blue = blue;
+  this->green = green;
+  this->red = red;
+  this->alpha = alpha;
+}
+
+RgbaColor::RgbaColor(uint8_t blue, uint8_t green, uint8_t red)
+    : RgbaColor(blue, green, red, 0xff) {}
+
+RgbaColor::RgbaColor(const uint8_t* bgra)
+    : RgbaColor(bgra[0], bgra[1], bgra[2], bgra[3]) {}
+
+bool RgbaColor::operator==(const RgbaColor& right) const {
+  return blue == right.blue && green == right.green && red == right.red &&
+         AlphaEquals(alpha, right.alpha);
+}
+
+bool RgbaColor::operator!=(const RgbaColor& right) const {
+  return !(*this == right);
+}
+
+}  // namespace webrtc