1 /*
2 * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 #include "modules/desktop_capture/desktop_frame_win.h"
12
13 #include <utility>
14
15 #include "rtc_base/logging.h"
16
17 namespace webrtc {
18
DesktopFrameWin(DesktopSize size,int stride,uint8_t * data,std::unique_ptr<SharedMemory> shared_memory,HBITMAP bitmap)19 DesktopFrameWin::DesktopFrameWin(DesktopSize size,
20 int stride,
21 uint8_t* data,
22 std::unique_ptr<SharedMemory> shared_memory,
23 HBITMAP bitmap)
24 : DesktopFrame(size, stride, data, shared_memory.get()),
25 bitmap_(bitmap),
26 owned_shared_memory_(std::move(shared_memory)) {}
27
~DesktopFrameWin()28 DesktopFrameWin::~DesktopFrameWin() {
29 DeleteObject(bitmap_);
30 }
31
32 // static
Create(DesktopSize size,SharedMemoryFactory * shared_memory_factory,HDC hdc)33 std::unique_ptr<DesktopFrameWin> DesktopFrameWin::Create(
34 DesktopSize size,
35 SharedMemoryFactory* shared_memory_factory,
36 HDC hdc) {
37 int bytes_per_row = size.width() * kBytesPerPixel;
38 int buffer_size = bytes_per_row * size.height();
39
40 // Describe a device independent bitmap (DIB) that is the size of the desktop.
41 BITMAPINFO bmi = {};
42 bmi.bmiHeader.biHeight = -size.height();
43 bmi.bmiHeader.biWidth = size.width();
44 bmi.bmiHeader.biPlanes = 1;
45 bmi.bmiHeader.biBitCount = DesktopFrameWin::kBytesPerPixel * 8;
46 bmi.bmiHeader.biSize = sizeof(bmi.bmiHeader);
47 bmi.bmiHeader.biSizeImage = bytes_per_row * size.height();
48
49 std::unique_ptr<SharedMemory> shared_memory;
50 HANDLE section_handle = nullptr;
51 if (shared_memory_factory) {
52 shared_memory = shared_memory_factory->CreateSharedMemory(buffer_size);
53 section_handle = shared_memory->handle();
54 }
55 void* data = nullptr;
56 HBITMAP bitmap =
57 CreateDIBSection(hdc, &bmi, DIB_RGB_COLORS, &data, section_handle, 0);
58 if (!bitmap) {
59 RTC_LOG(LS_WARNING) << "Failed to allocate new window frame "
60 << GetLastError();
61 return nullptr;
62 }
63
64 return std::unique_ptr<DesktopFrameWin>(
65 new DesktopFrameWin(size, bytes_per_row, reinterpret_cast<uint8_t*>(data),
66 std::move(shared_memory), bitmap));
67 }
68
69 } // namespace webrtc
70