src/utils/quant_levels_dec_utils.h

// 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/utils/bounds_safety.h"
#include "src/webp/types.h"

WEBP_ASSUME_UNSAFE_INDEXABLE_ABI

#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* WEBP_SIZED_BY((size_t)stride* height)
                             const data,
                         int width, int height, int stride, int strength);

#ifdef __cplusplus
}  // extern "C"
#endif

#endif  // WEBP_UTILS_QUANT_LEVELS_DEC_UTILS_H_