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