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
19 namespace webrtc {
20
21 // A DesktopFrame that is a sub-rect of another DesktopFrame.
22 class CroppedDesktopFrame : public DesktopFrame {
23 public:
24 CroppedDesktopFrame(std::unique_ptr<DesktopFrame> frame,
25 const DesktopRect& rect);
26
27 CroppedDesktopFrame(const CroppedDesktopFrame&) = delete;
28 CroppedDesktopFrame& operator=(const CroppedDesktopFrame&) = delete;
29
30 private:
31 const std::unique_ptr<DesktopFrame> frame_;
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 DesktopRect intersection = DesktopRect::MakeSize(frame->size());
40 intersection.IntersectWith(rect);
41 if (intersection.is_empty()) {
42 return nullptr;
43 }
44
45 if (frame->size().equals(rect.size())) {
46 return frame;
47 }
48
49 return std::unique_ptr<DesktopFrame>(
50 new CroppedDesktopFrame(std::move(frame), intersection));
51 }
52
CroppedDesktopFrame(std::unique_ptr<DesktopFrame> frame,const DesktopRect & rect)53 CroppedDesktopFrame::CroppedDesktopFrame(std::unique_ptr<DesktopFrame> frame,
54 const DesktopRect& rect)
55 : DesktopFrame(rect.size(),
56 frame->stride(),
57 frame->GetFrameDataAtPos(rect.top_left()),
58 frame->shared_memory()),
59 frame_(std::move(frame)) {
60 MoveFrameInfoFrom(frame_.get());
61 set_top_left(frame_->top_left().add(rect.top_left()));
62 mutable_updated_region()->IntersectWith(rect);
63 mutable_updated_region()->Translate(-rect.left(), -rect.top());
64 }
65
66 } // namespace webrtc
67