Copy the (early prototype of) remoting in Chrome into the public tree....

remoting/client/decoder_verbatim.cc

+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "remoting/client/decoder_verbatim.h"
+
+namespace remoting {
+
+bool DecoderVerbatim::BeginDecode(scoped_refptr<media::VideoFrame> frame) {
+  // TODO(hclam): Check if we can accept the codec.
+  frame_ = frame;
+  return true;
+}
+
+bool DecoderVerbatim::PartialDecode(chromotocol_pb::HostMessage* message) {
+  scoped_ptr<chromotocol_pb::HostMessage> msg_deleter(message);
+
+  // TODO(hclam): Support YUV.
+  if (static_cast<int>(message->update_stream_packet().header().pixel_format())
+      != static_cast<int>(frame_->format())) {
+    return false;
+  }
+  int width = message->update_stream_packet().header().width();
+  int height = message->update_stream_packet().header().height();
+  int x = message->update_stream_packet().header().x();
+  int y = message->update_stream_packet().header().y();
+  chromotocol_pb::PixelFormat pixel_format =
+      message->update_stream_packet().header().pixel_format();
+  int bytes_per_pixel = 0;
+
+  // TODO(hclam): Extract the following to an util function.
+  if (pixel_format == chromotocol_pb::PixelFormatRgb24) {
+    bytes_per_pixel = 3;
+  } else if (pixel_format == chromotocol_pb::PixelFormatRgb565) {
+    bytes_per_pixel = 2;
+  } else if (pixel_format == chromotocol_pb::PixelFormatRgb32) {
+    bytes_per_pixel = 4;
+  } else if (pixel_format != chromotocol_pb::PixelFormatAscii) {
+    bytes_per_pixel = 1;
+  } else {
+    NOTREACHED() << "Pixel format not supported";
+  }
+
+  // Copy the data line by line.
+  const int src_stride = bytes_per_pixel * width;
+  const char* src = message->update_stream_packet().data().c_str();
+  const int dest_stride = frame_->stride(media::VideoFrame::kRGBPlane);
+  uint8* dest = frame_->data(media::VideoFrame::kRGBPlane) +
+                dest_stride * y + bytes_per_pixel * x;
+  for (int i = 0; i < height; ++i) {
+    memcpy(dest, src, src_stride);
+    dest += dest_stride;
+    src += src_stride;
+  }
+
+  UpdatedRects rects;
+  rects.push_back(gfx::Rect(x, y, width, height));
+  partial_decode_done()->Run(frame_, rects);
+  return true;
+}
+
+void DecoderVerbatim::EndDecode() {
+  decode_done()->Run(frame_);
+  frame_ = NULL;
+}
+
+}  // namespace remoting