src/remoting/host/screen_capturer_fake.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "remoting/host/screen_capturer_fake.h"
   6
   7 #include "base/logging.h"
   8 #include "base/time/time.h"
   9 #include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
  10
  11 namespace remoting {
  12
  13 // ScreenCapturerFake generates a white picture of size kWidth x kHeight
  14 // with a rectangle of size kBoxWidth x kBoxHeight. The rectangle moves kSpeed
  15 // pixels per frame along both axes, and bounces off the sides of the screen.
  16 static const int kWidth = ScreenCapturerFake::kWidth;
  17 static const int kHeight = ScreenCapturerFake::kHeight;
  18 static const int kBoxWidth = 140;
  19 static const int kBoxHeight = 140;
  20 static const int kSpeed = 20;
  21
  22 COMPILE_ASSERT(kBoxWidth < kWidth && kBoxHeight < kHeight, bad_box_size);
  23 COMPILE_ASSERT((kBoxWidth % kSpeed == 0) && (kWidth % kSpeed == 0) &&
  24                (kBoxHeight % kSpeed == 0) && (kHeight % kSpeed == 0),
  25                sizes_must_be_multiple_of_kSpeed);
  26
  27 ScreenCapturerFake::ScreenCapturerFake()
  28     : callback_(NULL),
  29       mouse_shape_observer_(NULL),
  30       bytes_per_row_(0),
  31       box_pos_x_(0),
  32       box_pos_y_(0),
  33       box_speed_x_(kSpeed),
  34       box_speed_y_(kSpeed) {
  35   ScreenConfigurationChanged();
  36 }
  37
  38 ScreenCapturerFake::~ScreenCapturerFake() {
  39 }
  40
  41 void ScreenCapturerFake::Start(Callback* callback) {
  42   DCHECK(!callback_);
  43   DCHECK(callback);
  44   callback_ = callback;
  45 }
  46
  47 void ScreenCapturerFake::Capture(const webrtc::DesktopRegion& region) {
  48   base::Time capture_start_time = base::Time::Now();
  49
  50   queue_.MoveToNextFrame();
  51
  52   if (!queue_.current_frame()) {
  53     int buffer_size = size_.height() * bytes_per_row_;
  54     webrtc::SharedMemory* shared_memory =
  55         callback_->CreateSharedMemory(buffer_size);
  56     scoped_ptr<webrtc::DesktopFrame> frame;
  57     webrtc::DesktopSize frame_size(size_.width(), size_.height());
  58     if (shared_memory) {
  59       frame.reset(new webrtc::SharedMemoryDesktopFrame(
  60           frame_size, bytes_per_row_, shared_memory));
  61     } else {
  62       frame.reset(new webrtc::BasicDesktopFrame(frame_size));
  63     }
  64     queue_.ReplaceCurrentFrame(frame.release());
  65   }
  66
  67   DCHECK(queue_.current_frame());
  68   GenerateImage();
  69
  70   queue_.current_frame()->mutable_updated_region()->SetRect(
  71       webrtc::DesktopRect::MakeSize(size_));
  72   queue_.current_frame()->set_capture_time_ms(
  73       (base::Time::Now() - capture_start_time).InMillisecondsRoundedUp());
  74
  75   callback_->OnCaptureCompleted(queue_.current_frame()->Share());
  76 }
  77
  78 void ScreenCapturerFake::SetMouseShapeObserver(
  79       MouseShapeObserver* mouse_shape_observer) {
  80   DCHECK(!mouse_shape_observer_);
  81   DCHECK(mouse_shape_observer);
  82   mouse_shape_observer_ = mouse_shape_observer;
  83 }
  84
  85 void ScreenCapturerFake::GenerateImage() {
  86   webrtc::DesktopFrame* frame = queue_.current_frame();
  87
  88   const int kBytesPerPixel = webrtc::DesktopFrame::kBytesPerPixel;
  89
  90   memset(frame->data(), 0xff,
  91          size_.width() * size_.height() * kBytesPerPixel);
  92
  93   uint8* row = frame->data() +
  94       (box_pos_y_ * size_.width() + box_pos_x_) * kBytesPerPixel;
  95
  96   box_pos_x_ += box_speed_x_;
  97   if (box_pos_x_ + kBoxWidth >= size_.width() || box_pos_x_ == 0)
  98     box_speed_x_ = -box_speed_x_;
  99
 100   box_pos_y_ += box_speed_y_;
 101   if (box_pos_y_ + kBoxHeight >= size_.height() || box_pos_y_ == 0)
 102     box_speed_y_ = -box_speed_y_;
 103
 104   // Draw rectangle with the following colors in its corners:
 105   //     cyan....yellow
 106   //     ..............
 107   //     blue.......red
 108   for (int y = 0; y < kBoxHeight; ++y) {
 109     for (int x = 0; x < kBoxWidth; ++x) {
 110       int r = x * 255 / kBoxWidth;
 111       int g = y * 255 / kBoxHeight;
 112       int b = 255 - (x * 255 / kBoxWidth);
 113       row[x * kBytesPerPixel] = r;
 114       row[x * kBytesPerPixel + 1] = g;
 115       row[x * kBytesPerPixel + 2] = b;
 116       row[x * kBytesPerPixel + 3] = 0xff;
 117     }
 118     row += bytes_per_row_;
 119   }
 120 }
 121
 122 void ScreenCapturerFake::ScreenConfigurationChanged() {
 123   size_.set(kWidth, kHeight);
 124   queue_.Reset();
 125   bytes_per_row_ = size_.width() * webrtc::DesktopFrame::kBytesPerPixel;
 126 }
 127
 128 }  // namespace remoting