Use webrtc::DesktopCapturer for screen capturer implementation.

media/video/capture/screen/screen_capturer_fake.cc

 // Copyright (c) 2012 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 "media/video/capture/screen/screen_capturer_fake.h"
 
+#include "base/logging.h"
 #include "base/time.h"
-#include "media/video/capture/screen/screen_capture_data.h"
+#include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
 
 namespace media {
 
 // ScreenCapturerFake generates a white picture of size kWidth x kHeight
 // with a rectangle of size kBoxWidth x kBoxHeight. The rectangle moves kSpeed
 // pixels per frame along both axes, and bounces off the sides of the screen.
 static const int kWidth = ScreenCapturerFake::kWidth;
 static const int kHeight = ScreenCapturerFake::kHeight;
 static const int kBoxWidth = 140;
 static const int kBoxHeight = 140;
 static const int kSpeed = 20;
 
 COMPILE_ASSERT(kBoxWidth < kWidth && kBoxHeight < kHeight, bad_box_size);
 COMPILE_ASSERT((kBoxWidth % kSpeed == 0) && (kWidth % kSpeed == 0) &&
                (kBoxHeight % kSpeed == 0) && (kHeight % kSpeed == 0),
                sizes_must_be_multiple_of_kSpeed);
 
 ScreenCapturerFake::ScreenCapturerFake()
-    : size_(SkISize::Make(0, 0)),
+    : callback_(NULL),
+      mouse_shape_observer_(NULL),
       bytes_per_row_(0),
       box_pos_x_(0),
       box_pos_y_(0),
       box_speed_x_(kSpeed),
-      box_speed_y_(kSpeed),
-      current_buffer_(0) {
+      box_speed_y_(kSpeed) {
   ScreenConfigurationChanged();
 }
 
 ScreenCapturerFake::~ScreenCapturerFake() {
 }
 
-void ScreenCapturerFake::Start(Delegate* delegate) {
-  delegate_ = delegate;
-
-  // Create memory for the buffers.
-  int buffer_size = size_.height() * bytes_per_row_;
-  for (int i = 0; i < kNumBuffers; i++) {
-    shared_buffers_[i] = delegate_->CreateSharedBuffer(buffer_size);
-    if (shared_buffers_[i]) {
-      buffers_[i] = reinterpret_cast<uint8*>(shared_buffers_[i]->ptr());
-    } else {
-      private_buffers_[i].reset(new uint8[buffer_size]);
-      buffers_[i] = private_buffers_[i].get();
-    }
-  }
+void ScreenCapturerFake::Start(Callback* callback) {
+  callback_ = callback;

[alexeypa (please no reviews), 2013/04/26 21:33:58]

DCHECK(!callback_);
DCHECK(callback);

Add the above before the assignment.

[Sergey Ulanov, 2013/05/07 22:25:50]

Done.

 }
 
-void ScreenCapturerFake::CaptureFrame() {
+void ScreenCapturerFake::Capture(const webrtc::DesktopRegion& region) {
   base::Time capture_start_time = base::Time::Now();
 
+  if (queue_.current_frame_needs_update()) {

[Wez, 2013/04/26 18:48:14]

See comment on queue; I think it's better to just have current_frame() return
NULL in the case where a new frame is needed.

[Sergey Ulanov, 2013/05/07 22:25:50]

Done.

+    int buffer_size = size_.height() * bytes_per_row_;
+    webrtc::SharedMemory* shared_memory =
+        callback_->CreateSharedMemory(buffer_size);
+    scoped_ptr<webrtc::DesktopFrame> frame;
+    webrtc::DesktopSize frame_size(size_.width(), size_.height());
+    if (shared_memory) {
+      frame.reset(new webrtc::SharedMemoryDesktopFrame(
+          frame_size, bytes_per_row_, shared_memory));
+    } else {
+      frame.reset(new webrtc::BasicDesktopFrame(frame_size));
+    }
+    queue_.ReplaceCurrentFrame(frame.Pass());
+  }
+
+  DCHECK(queue_.current_frame());
   GenerateImage();
-  helper_.InvalidateScreen(size_);
 
-  SkRegion invalid_region;
-  helper_.SwapInvalidRegion(&invalid_region);
+  queue_.current_frame()->mutable_updated_region()->SetRect(
+      webrtc::DesktopRect::MakeSize(size_));
+  queue_.current_frame()->set_capture_time_ms(
+      (base::Time::Now() - capture_start_time).InMillisecondsRoundedUp());
 
-  current_buffer_ = (current_buffer_ + 1) % kNumBuffers;
+  callback_->OnCaptureCompleted(queue_.EmitCurrentFrameAndMoveToNext());
+}
 
-  scoped_refptr<ScreenCaptureData> capture_data(new ScreenCaptureData(
-      buffers_[current_buffer_], bytes_per_row_, size_));
-  capture_data->mutable_dirty_region() = invalid_region;
-
-  helper_.set_size_most_recent(size_);
-
-  capture_data->set_shared_buffer(shared_buffers_[current_buffer_]);
-
-  capture_data->set_capture_time_ms(
-      (base::Time::Now() - capture_start_time).InMillisecondsRoundedUp());
-  delegate_->OnCaptureCompleted(capture_data);
+void ScreenCapturerFake::SetMouseShapeObserver(
+      MouseShapeObserver* mouse_shape_observer) {
+  mouse_shape_observer_ = mouse_shape_observer;

[alexeypa (please no reviews), 2013/04/26 21:33:58]

DCHECK(!mouse_shape_observer_);
DCHECK(mouse_shape_observer);

Add the above before the assignment.

[Sergey Ulanov, 2013/05/07 22:25:50]

Done.

 }
 
 void ScreenCapturerFake::GenerateImage() {
-  memset(buffers_[current_buffer_], 0xff,
-         size_.width() * size_.height() * ScreenCaptureData::kBytesPerPixel);
+  webrtc::DesktopFrame* frame = queue_.current_frame();
 
-  uint8* row = buffers_[current_buffer_] +
-      (box_pos_y_ * size_.width() + box_pos_x_) *
-      ScreenCaptureData::kBytesPerPixel;
+  const int kBytesPerPixel = webrtc::DesktopFrame::kBytesPerPixel;
+
+  memset(frame->data(), 0xff,
+         size_.width() * size_.height() * kBytesPerPixel);
+
+  uint8* row = frame->data() +
+      (box_pos_y_ * size_.width() + box_pos_x_) * kBytesPerPixel;
 
   box_pos_x_ += box_speed_x_;
   if (box_pos_x_ + kBoxWidth >= size_.width() || box_pos_x_ == 0)
     box_speed_x_ = -box_speed_x_;
 
   box_pos_y_ += box_speed_y_;
   if (box_pos_y_ + kBoxHeight >= size_.height() || box_pos_y_ == 0)
     box_speed_y_ = -box_speed_y_;
 
   // Draw rectangle with the following colors in its corners:
   //     cyan....yellow
   //     ..............
   //     blue.......red
   for (int y = 0; y < kBoxHeight; ++y) {
     for (int x = 0; x < kBoxWidth; ++x) {
       int r = x * 255 / kBoxWidth;
       int g = y * 255 / kBoxHeight;
       int b = 255 - (x * 255 / kBoxWidth);
-      row[x * ScreenCaptureData::kBytesPerPixel] = r;
-      row[x * ScreenCaptureData::kBytesPerPixel + 1] = g;
-      row[x * ScreenCaptureData::kBytesPerPixel + 2] = b;
-      row[x * ScreenCaptureData::kBytesPerPixel + 3] = 0xff;
+      row[x * kBytesPerPixel] = r;
+      row[x * kBytesPerPixel + 1] = g;
+      row[x * kBytesPerPixel + 2] = b;
+      row[x * kBytesPerPixel + 3] = 0xff;
     }
     row += bytes_per_row_;
   }
 }
 
 void ScreenCapturerFake::ScreenConfigurationChanged() {
-  size_ = SkISize::Make(kWidth, kHeight);
-  bytes_per_row_ = size_.width() * ScreenCaptureData::kBytesPerPixel;
+  size_.set(kWidth, kHeight);
+  queue_.SetAllFramesNeedUpdate();
+  bytes_per_row_ = size_.width() * webrtc::DesktopFrame::kBytesPerPixel;
 }
 
 }  // namespace media