gecko-dev/image/Deinterlacer.cpp

56 lines
1.4 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "Downscaler.h"
#include "mozilla/UniquePtrExtensions.h"
namespace mozilla {
namespace image {
Deinterlacer::Deinterlacer(const nsIntSize& aImageSize)
: mImageSize(aImageSize)
{
CheckedInt<size_t> bufferSize = mImageSize.width;
bufferSize *= mImageSize.height;
bufferSize *= sizeof(uint32_t);
if (!bufferSize.isValid()) {
return;
}
mBuffer = MakeUniqueFallible<uint8_t[]>(bufferSize.value());
}
uint32_t
Deinterlacer::RowSize() const
{
return mImageSize.width * sizeof(uint32_t);
}
uint8_t*
Deinterlacer::RowBuffer(uint32_t aRow)
{
uint32_t offset = aRow * RowSize();
MOZ_ASSERT(IsValid(), "Deinterlacer in invalid state");
MOZ_ASSERT(offset < mImageSize.width * mImageSize.height * sizeof(uint32_t),
"Row is outside of image");
return mBuffer.get() + offset;
}
void
Deinterlacer::PropagatePassToDownscaler(Downscaler& aDownscaler)
{
MOZ_ASSERT(IsValid(), "Deinterlacer in invalid state");
for (int32_t row = 0 ; row < mImageSize.height ; ++row) {
memcpy(aDownscaler.RowBuffer(), RowBuffer(row), RowSize());
aDownscaler.CommitRow();
}
}
} // namespace image
} // namespace mozilla