modules/desktop_capture/desktop_frame_rotation.h

/*
 *  Copyright (c) 2016 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.
 */

#ifndef WEBRTC_MODULES_DESKTOP_CAPTURE_DESKTOP_FRAME_ROTATION_H_
#define WEBRTC_MODULES_DESKTOP_CAPTURE_DESKTOP_FRAME_ROTATION_H_

#include "webrtc/modules/desktop_capture/desktop_frame.h"
#include "webrtc/modules/desktop_capture/desktop_geometry.h"

namespace webrtc {

// Represents the rotation of a DesktopFrame.
enum class Rotation {
  CLOCK_WISE_0,
  CLOCK_WISE_90,
  CLOCK_WISE_180,
  CLOCK_WISE_270,
};

// Rotates input DesktopFrame |source|, copies pixel in an unrotated rectangle
// |source_rect| into the target rectangle of another DesktopFrame |target|.
// Target rectangle here is the rotated |source_rect| plus |target_offset|.
// |rotation| specifies |source| to |target| rotation. |source_rect| is in
// |source| coordinate. |target_offset| is in |target| coordinate.
// This function triggers check failure if |source| does not cover the
// |source_rect|, or |target| does not cover the rotated |rect|.
void RotateDesktopFrame(const DesktopFrame& source,
                        const DesktopRect& source_rect,
                        const Rotation& rotation,
                        const DesktopVector& target_offset,
                        DesktopFrame* target);

// Returns a reverse rotation of |rotation|.
Rotation ReverseRotation(Rotation rotation);

// Returns a rotated DesktopSize of |size|.
DesktopSize RotateSize(DesktopSize size, Rotation rotation);

// Returns a rotated DesktopRect of |rect|. The |size| represents the size of
// the DesktopFrame which |rect| belongs in.
DesktopRect RotateRect(DesktopRect rect, DesktopSize size, Rotation rotation);

}  // namespace webrtc

#endif  // WEBRTC_MODULES_DESKTOP_CAPTURE_DESKTOP_FRAME_ROTATION_H_