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_UTILS_H_ |
15 | #define WEBP_UTILS_QUANT_LEVELS_UTILS_H_ |
16 | |
17 | #include <stdlib.h> |
18 | |
19 | #include "src/webp/types.h" |
20 | |
21 | #ifdef __cplusplus |
22 | extern "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). |
29 | int 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_UTILS_H_ |
37 | |