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/*
* 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.
*/
#include "modules/desktop_capture/desktop_frame_rotation.h"
#include "rtc_base/checks.h"
#include "third_party/libyuv/include/libyuv/rotate_argb.h"
namespace webrtc {
namespace {
libyuv::RotationMode ToLibyuvRotationMode(Rotation rotation) {
switch (rotation) {
case Rotation::CLOCK_WISE_0:
return libyuv::kRotate0;
case Rotation::CLOCK_WISE_90:
return libyuv::kRotate90;
case Rotation::CLOCK_WISE_180:
return libyuv::kRotate180;
case Rotation::CLOCK_WISE_270:
return libyuv::kRotate270;
}
RTC_DCHECK_NOTREACHED();
return libyuv::kRotate0;
}
DesktopRect RotateAndOffsetRect(DesktopRect rect,
DesktopSize size,
Rotation rotation,
DesktopVector offset) {
DesktopRect result = RotateRect(rect, size, rotation);
result.Translate(offset);
return result;
}
} // namespace
Rotation ReverseRotation(Rotation rotation) {
switch (rotation) {
case Rotation::CLOCK_WISE_0:
return rotation;
case Rotation::CLOCK_WISE_90:
return Rotation::CLOCK_WISE_270;
case Rotation::CLOCK_WISE_180:
return Rotation::CLOCK_WISE_180;
case Rotation::CLOCK_WISE_270:
return Rotation::CLOCK_WISE_90;
}
RTC_DCHECK_NOTREACHED();
return Rotation::CLOCK_WISE_0;
}
DesktopSize RotateSize(DesktopSize size, Rotation rotation) {
switch (rotation) {
case Rotation::CLOCK_WISE_0:
case Rotation::CLOCK_WISE_180:
return size;
case Rotation::CLOCK_WISE_90:
case Rotation::CLOCK_WISE_270:
return DesktopSize(size.height(), size.width());
}
RTC_DCHECK_NOTREACHED();
return DesktopSize();
}
DesktopRect RotateRect(DesktopRect rect, DesktopSize size, Rotation rotation) {
switch (rotation) {
case Rotation::CLOCK_WISE_0:
return rect;
case Rotation::CLOCK_WISE_90:
return DesktopRect::MakeXYWH(size.height() - rect.bottom(), rect.left(),
rect.height(), rect.width());
case Rotation::CLOCK_WISE_180:
return DesktopRect::MakeXYWH(size.width() - rect.right(),
size.height() - rect.bottom(), rect.width(),
rect.height());
case Rotation::CLOCK_WISE_270:
return DesktopRect::MakeXYWH(rect.top(), size.width() - rect.right(),
rect.height(), rect.width());
}
RTC_DCHECK_NOTREACHED();
return DesktopRect();
}
void RotateDesktopFrame(const DesktopFrame& source,
const DesktopRect& source_rect,
const Rotation& rotation,
const DesktopVector& target_offset,
DesktopFrame* target) {
RTC_DCHECK(target);
RTC_DCHECK(DesktopRect::MakeSize(source.size()).ContainsRect(source_rect));
// The rectangle in `target`.
const DesktopRect target_rect =
RotateAndOffsetRect(source_rect, source.size(), rotation, target_offset);
RTC_DCHECK(DesktopRect::MakeSize(target->size()).ContainsRect(target_rect));
if (target_rect.is_empty()) {
return;
}
int result = libyuv::ARGBRotate(
source.GetFrameDataAtPos(source_rect.top_left()), source.stride(),
target->GetFrameDataAtPos(target_rect.top_left()), target->stride(),
source_rect.width(), source_rect.height(),
ToLibyuvRotationMode(rotation));
RTC_DCHECK_EQ(result, 0);
}
} // namespace webrtc