Add DesktopFrame rotation functions

webrtc/modules/desktop_capture/desktop_frame.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 39 matching lines @@
       DesktopRect::MakeOriginSize(src_pos, dest_rect.size())));
 
   CopyPixelsFrom(src_frame.GetFrameDataAtPos(src_pos),
                  src_frame.stride(), dest_rect);
 }
 
 uint8_t* DesktopFrame::GetFrameDataAtPos(const DesktopVector& pos) const {
   return data() + stride() * pos.y() + DesktopFrame::kBytesPerPixel * pos.x();
 }
 
+bool DesktopFrame::DataEquals(const DesktopFrame& other) const {
+  if (!size().equals(other.size())) {
+    return false;
+  }
+  if (stride() == other.stride() &&
+      stride() == DesktopFrame::kBytesPerPixel * size().width()) {
+    return memcmp(data(), other.data(), stride() * size().height()) == 0;
+  }
+
+  const uint8_t* my_array = data();
+  const uint8_t* other_array = other.data();
+  for (int i = 0; i < size().height(); i++) {
+    const uint8_t* my_this_line = my_array;
+    const uint8_t* other_this_line = other_array;
+    for (int j = 0; j < size().width(); j++) {
+      if (memcmp(my_this_line, other_this_line, kBytesPerPixel)
+          != 0) {
+        return false;
+      }
+      my_this_line += kBytesPerPixel;
+      other_this_line += kBytesPerPixel;
+    }
+    my_array += stride();
+    other_array += other.stride();
+  }
+
+  return true;
+}
+
+void DesktopFrame::Paint(DesktopVector pos, RgbaColor color) {
+  RTC_DCHECK(DesktopRect::MakeSize(size()).Contains(pos));
+  *reinterpret_cast<uint32_t*>(GetFrameDataAtPos(pos)) = color.ToUInt32();
+}
+
+void DesktopFrame::Clear() {
+  memset(data(), 0, stride() * size().height());
+}
+
 BasicDesktopFrame::BasicDesktopFrame(DesktopSize size)
     : DesktopFrame(size, kBytesPerPixel * size.width(),
                    new uint8_t[kBytesPerPixel * size.width() * size.height()],
                    NULL) {
 }
 
 BasicDesktopFrame::~BasicDesktopFrame() {
   delete[] data_;
 }
 
@@ skipping 39 matching lines @@
     : DesktopFrame(size,
                    stride,
                    reinterpret_cast<uint8_t*>(shared_memory->data()),
                    shared_memory) {}
 
 SharedMemoryDesktopFrame::~SharedMemoryDesktopFrame() {
   delete shared_memory_;
 }
 
 }  // namespace webrtc