1 /*
2 * Copyright (c) 2014 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/cropped_desktop_frame.h"
12
13 #include <memory>
14 #include <utility>
15
16 #include "modules/desktop_capture/desktop_region.h"
17 #include "rtc_base/checks.h"
18 #include "rtc_base/constructor_magic.h"
19
20 namespace webrtc {
21
22 // A DesktopFrame that is a sub-rect of another DesktopFrame.
23 class CroppedDesktopFrame : public DesktopFrame {
24 public:
25 CroppedDesktopFrame(std::unique_ptr<DesktopFrame> frame,
26 const DesktopRect& rect);
27
28 private:
29 const std::unique_ptr<DesktopFrame> frame_;
30
31 RTC_DISALLOW_COPY_AND_ASSIGN(CroppedDesktopFrame);
32 };
33
CreateCroppedDesktopFrame(std::unique_ptr<DesktopFrame> frame,const DesktopRect & rect)34 std::unique_ptr<DesktopFrame> CreateCroppedDesktopFrame(
35 std::unique_ptr<DesktopFrame> frame,
36 const DesktopRect& rect) {
37 RTC_DCHECK(frame);
38
39 if (!DesktopRect::MakeSize(frame->size()).ContainsRect(rect)) {
40 return nullptr;
41 }
42
43 if (frame->size().equals(rect.size())) {
44 return frame;
45 }
46
47 return std::unique_ptr<DesktopFrame>(
48 new CroppedDesktopFrame(std::move(frame), rect));
49 }
50
CroppedDesktopFrame(std::unique_ptr<DesktopFrame> frame,const DesktopRect & rect)51 CroppedDesktopFrame::CroppedDesktopFrame(std::unique_ptr<DesktopFrame> frame,
52 const DesktopRect& rect)
53 : DesktopFrame(rect.size(),
54 frame->stride(),
55 frame->GetFrameDataAtPos(rect.top_left()),
56 frame->shared_memory()),
57 frame_(std::move(frame)) {
58 MoveFrameInfoFrom(frame_.get());
59 set_top_left(frame_->top_left().add(rect.top_left()));
60 mutable_updated_region()->IntersectWith(rect);
61 mutable_updated_region()->Translate(-rect.left(), -rect.top());
62 }
63
64 } // namespace webrtc
65