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/*
* Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "modules/desktop_capture/cropped_desktop_frame.h"
#include <memory>
#include <utility>
#include "modules/desktop_capture/desktop_region.h"
#include "rtc_base/checks.h"
namespace webrtc {
// A DesktopFrame that is a sub-rect of another DesktopFrame.
class CroppedDesktopFrame : public DesktopFrame {
public:
CroppedDesktopFrame(std::unique_ptr<DesktopFrame> frame,
const DesktopRect& rect);
CroppedDesktopFrame(const CroppedDesktopFrame&) = delete;
CroppedDesktopFrame& operator=(const CroppedDesktopFrame&) = delete;
private:
const std::unique_ptr<DesktopFrame> frame_;
};
std::unique_ptr<DesktopFrame> CreateCroppedDesktopFrame(
std::unique_ptr<DesktopFrame> frame,
const DesktopRect& rect) {
RTC_DCHECK(frame);
DesktopRect intersection = DesktopRect::MakeSize(frame->size());
intersection.IntersectWith(rect);
if (intersection.is_empty()) {
return nullptr;
}
if (frame->size().equals(rect.size())) {
return frame;
}
return std::unique_ptr<DesktopFrame>(
new CroppedDesktopFrame(std::move(frame), intersection));
}
CroppedDesktopFrame::CroppedDesktopFrame(std::unique_ptr<DesktopFrame> frame,
const DesktopRect& rect)
: DesktopFrame(rect.size(),
frame->stride(),
frame->GetFrameDataAtPos(rect.top_left()),
frame->shared_memory()),
frame_(std::move(frame)) {
MoveFrameInfoFrom(frame_.get());
set_top_left(frame_->top_left().add(rect.top_left()));
mutable_updated_region()->IntersectWith(rect);
mutable_updated_region()->Translate(-rect.left(), -rect.top());
}
} // namespace webrtc
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