quant_levels_dec_utils.h

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// Copyright 2013 Google Inc. All Rights Reserved.

//

// Use of this source code is governed by a BSD-style license

// that can be found in the COPYING 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.

// -----------------------------------------------------------------------------

//

// Alpha plane de-quantization utility

//

// Author:  Vikas Arora (vikasa@google.com)

#ifndef WEBP_UTILS_QUANT_LEVELS_DEC_UTILS_H_

#define WEBP_UTILS_QUANT_LEVELS_DEC_UTILS_H_

#include "src/webp/types.h"

#ifdef __cplusplus

extern "C" {

#endif

// Apply post-processing to input 'data' of size 'width'x'height' assuming that

// the source was quantized to a reduced number of levels. 'stride' is in bytes.

// Strength is in [0..100] and controls the amount of dithering applied.

// Returns false in case of error (data is NULL, invalid parameters,

// malloc failure, ...).

int WebPDequantizeLevels(uint8_t* const data, int width, int height, int stride,

                         int strength);

#ifdef __cplusplus

}    // extern "C"

#endif

#endif  // WEBP_UTILS_QUANT_LEVELS_DEC_UTILS_H_