| // Copyright 2011 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 quantization utility |
| // |
| // Author: Vikas Arora (vikasa@google.com) |
| |
| #ifndef WEBP_UTILS_QUANT_LEVELS_UTILS_H_ |
| #define WEBP_UTILS_QUANT_LEVELS_UTILS_H_ |
| |
| #include <stdlib.h> |
| |
| #include "src/webp/types.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| // Replace the input 'data' of size 'width'x'height' with 'num-levels' |
| // quantized values. If not NULL, 'sse' will contain the sum of squared error. |
| // Valid range for 'num_levels' is [2, 256]. |
| // Returns false in case of error (data is NULL, or parameters are invalid). |
| int QuantizeLevels(uint8_t* const data, int width, int height, int num_levels, |
| uint64_t* const sse); |
| |
| #ifdef __cplusplus |
| } // extern "C" |
| #endif |
| |
| #endif /* WEBP_UTILS_QUANT_LEVELS_UTILS_H_ */ |
