/* -*- 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