1// Copyright 2011 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 quantization utility
11//
12// Author:  Vikas Arora (vikasa@google.com)
13
14#ifndef WEBP_UTILS_QUANT_LEVELS_H_
15#define WEBP_UTILS_QUANT_LEVELS_H_
16
17#include <stdlib.h>
18
19#include "webp/types.h"
20
21#ifdef __cplusplus
22extern "C" {
23#endif
24
25// Replace the input 'data' of size 'width'x'height' with 'num-levels'
26// quantized values. If not NULL, 'sse' will contain the sum of squared error.
27// Valid range for 'num_levels' is [2, 256].
28// Returns false in case of error (data is NULL, or parameters are invalid).
29int QuantizeLevels(uint8_t* const data, int width, int height, int num_levels,
30                   uint64_t* const sse);
31
32#ifdef __cplusplus
33}    // extern "C"
34#endif
35
36#endif  /* WEBP_UTILS_QUANT_LEVELS_H_ */
37