1// Copyright 2013 Google Inc. All Rights Reserved.
2//
3// Use of this source code is governed by a BSD-style license
4// that can be found in the COPYING file in the root of the source
5// tree. An additional intellectual property rights grant can be found
6// in the file PATENTS. All contributing project authors may
7// be found in the AUTHORS file in the root of the source tree.
8// -----------------------------------------------------------------------------
9//
10// Alpha plane de-quantization utility
11//
12// Author:  Vikas Arora (vikasa@google.com)
13
14#ifndef WEBP_UTILS_QUANT_LEVELS_DEC_H_
15#define WEBP_UTILS_QUANT_LEVELS_DEC_H_
16
17#include "../webp/types.h"
18
19#ifdef __cplusplus
20extern "C" {
21#endif
22
23// Apply post-processing to input 'data' of size 'width'x'height' assuming that
24// the source was quantized to a reduced number of levels. 'stride' is in bytes.
25// Strength is in [0..100] and controls the amount of dithering applied.
26// Returns false in case of error (data is NULL, invalid parameters,
27// malloc failure, ...).
28int WebPDequantizeLevels(uint8_t* const data, int width, int height, int stride,
29                         int strength);
30
31#ifdef __cplusplus
32}    // extern "C"
33#endif
34
35#endif  /* WEBP_UTILS_QUANT_LEVELS_DEC_H_ */
36