Initial pass at integrating Differ into the chromoting host code....

remoting/host/capturer_fake.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/host/capturer_fake.h"
 
 #include "gfx/rect.h"
 
 namespace remoting {
 
 static const int kWidth = 320;
 static const int kHeight = 240;
 static const int kBytesPerPixel = 4;  // 32 bit RGB is 4 bytes per pixel.
 static const int kMaxColorChannelValue = 255;
 
 CapturerFake::CapturerFake()
     : seed_(0) {
 }
 
 CapturerFake::~CapturerFake() {
 }
 
-void CapturerFake::CaptureRects(const RectVector& rects,
+void CapturerFake::ScreenConfigurationChanged() {
+  width_ = kWidth;
+  height_ = kHeight;
+  pixel_format_ = PixelFormatRgb32;
+  bytes_per_row_ = width_ * kBytesPerPixel;
+
+  // Create memory for the buffers.
+  int buffer_size = height_ * bytes_per_row_;
+  for (int i = 0; i < kNumBuffers; i++) {
+    buffers_[i].reset(new uint8[buffer_size]);
+  }
+}
+
+void CapturerFake::CalculateInvalidRects() {
+  GenerateImage();
+  InvalidateFullScreen();
+}
+
+void CapturerFake::CaptureRects(const InvalidRects& rects,
                                 CaptureCompletedCallback* callback) {
-  GenerateImage();
   DataPlanes planes;
   planes.data[0] = buffers_[current_buffer_].get();
   planes.strides[0] = bytes_per_row_;
 
   scoped_refptr<CaptureData> capture_data(new CaptureData(planes,
                                                           width_,
                                                           height_,
                                                           pixel_format_));
   capture_data->mutable_dirty_rects() = rects;
   FinishCapture(capture_data, callback);
 }
 
-void CapturerFake::ScreenConfigurationChanged() {
-  width_ = kWidth;
-  height_ = kHeight;
-  pixel_format_ = PixelFormatRgb32;
-  bytes_per_row_ = width_ * kBytesPerPixel;
-
-  // Create memory for the buffers.
-  int buffer_size = height_ * bytes_per_row_;
-  for (int i = 0; i < kNumBuffers; i++) {
-    buffers_[i].reset(new uint8[buffer_size]);
-  }
-}
-
 void CapturerFake::GenerateImage() {
   uint8* row = buffers_[current_buffer_].get();
   for (int y = 0; y < height_; ++y) {
     int offset = y % 3;
     for (int x = 0; x < width_; ++x) {
       row[x * kBytesPerPixel + offset] = seed_++;
       seed_ &= kMaxColorChannelValue;
     }
     row += bytes_per_row_;
   }
   ++seed_;
 }
 
 }  // namespace remoting