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
ScreenCapturerFake()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
~ScreenCapturerFake()38 ScreenCapturerFake::~ScreenCapturerFake() {
39 }
40
Start(Callback * callback)41 void ScreenCapturerFake::Start(Callback* callback) {
42 DCHECK(!callback_);
43 DCHECK(callback);
44 callback_ = callback;
45 }
46
Capture(const webrtc::DesktopRegion & region)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
SetMouseShapeObserver(MouseShapeObserver * mouse_shape_observer)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
GenerateImage()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
ScreenConfigurationChanged()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
129