tor-browser

The Tor Browser
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cropped_desktop_frame.cc (2251B)

      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_frame.h"
     17 #include "modules/desktop_capture/desktop_geometry.h"
     18 #include "modules/desktop_capture/desktop_region.h"
     19 #include "rtc_base/checks.h"
     20 
     21 namespace webrtc {
     22 
     23 // A DesktopFrame that is a sub-rect of another DesktopFrame.
     24 class CroppedDesktopFrame : public DesktopFrame {
     25 public:
     26  CroppedDesktopFrame(std::unique_ptr<DesktopFrame> frame,
     27                      const DesktopRect& rect);
     28 
     29  CroppedDesktopFrame(const CroppedDesktopFrame&) = delete;
     30  CroppedDesktopFrame& operator=(const CroppedDesktopFrame&) = delete;
     31 
     32 private:
     33  const std::unique_ptr<DesktopFrame> frame_;
     34 };
     35 
     36 std::unique_ptr<DesktopFrame> CreateCroppedDesktopFrame(
     37    std::unique_ptr<DesktopFrame> frame,
     38    const DesktopRect& rect) {
     39  RTC_DCHECK(frame);
     40 
     41  DesktopRect intersection = DesktopRect::MakeSize(frame->size());
     42  intersection.IntersectWith(rect);
     43  if (intersection.is_empty()) {
     44    return nullptr;
     45  }
     46 
     47  if (frame->size().equals(rect.size())) {
     48    return frame;
     49  }
     50 
     51  return std::unique_ptr<DesktopFrame>(
     52      new CroppedDesktopFrame(std::move(frame), intersection));
     53 }
     54 
     55 CroppedDesktopFrame::CroppedDesktopFrame(std::unique_ptr<DesktopFrame> frame,
     56                                         const DesktopRect& rect)
     57    : DesktopFrame(rect.size(),
     58                   frame->stride(),
     59                   frame->pixel_format(),
     60                   frame->GetFrameDataAtPos(rect.top_left()),
     61                   frame->shared_memory()),
     62      frame_(std::move(frame)) {
     63  MoveFrameInfoFrom(frame_.get());
     64  set_top_left(frame_->top_left().add(rect.top_left()));
     65  mutable_updated_region()->IntersectWith(rect);
     66  mutable_updated_region()->Translate(-rect.left(), -rect.top());
     67 }
     68 
     69 }  // namespace webrtc