mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-26 06:11:37 +00:00
51 lines
1.4 KiB
C++
51 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/. */
|
|
|
|
|
|
/**
|
|
* Deinterlacer is a utility class to allow Downscaler to work with interlaced
|
|
* images.
|
|
|
|
* Since Downscaler needs to receive rows in top-to-bottom or
|
|
* bottom-to-top order, it can't natively handle interlaced images, in which the
|
|
* rows arrive in an interleaved order. Deinterlacer solves this problem by
|
|
* acting as an intermediate buffer that records decoded rows. Unlike
|
|
* Downscaler, it allows the rows to be written in arbitrary order. After each
|
|
* pass, calling PropagatePassToDownscaler() will downscale every buffered row
|
|
* in a single operation. The rows remain in the buffer, so rows that were
|
|
* written in one pass will be included in subsequent passes.
|
|
*/
|
|
|
|
|
|
#ifndef mozilla_image_Deinterlacer_h
|
|
#define mozilla_image_Deinterlacer_h
|
|
|
|
#include "Downscaler.h"
|
|
|
|
namespace mozilla {
|
|
namespace image {
|
|
|
|
class Deinterlacer
|
|
{
|
|
public:
|
|
explicit Deinterlacer(const nsIntSize& aImageSize);
|
|
|
|
uint8_t* RowBuffer(uint32_t aRow);
|
|
void PropagatePassToDownscaler(Downscaler& aDownscaler);
|
|
|
|
private:
|
|
uint32_t RowSize() const;
|
|
|
|
nsIntSize mImageSize;
|
|
UniquePtr<uint8_t[]> mBuffer;
|
|
};
|
|
|
|
|
|
} // namespace image
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_image_Deinterlacer_h
|