| // Copyright 2011 Google Inc. All Rights Reserved. |
| // |
| // This code is licensed under the same terms as WebM: |
| // Software License Agreement: http://www.webmproject.org/license/software/ |
| // Additional IP Rights Grant: http://www.webmproject.org/license/additional/ |
| // ----------------------------------------------------------------------------- |
| // |
| // Alpha plane quantization utility |
| // |
| // Author: Vikas Arora (vikasa@google.com) |
| |
| #ifndef WEBP_UTILS_QUANT_LEVELS_H_ |
| #define WEBP_UTILS_QUANT_LEVELS_H_ |
| |
| #include <stdlib.h> |
| |
| #include "webp/types.h" |
| |
| #if defined(__cplusplus) || defined(c_plusplus) |
| 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); |
| |
| #if defined(__cplusplus) || defined(c_plusplus) |
| } // extern "C" |
| #endif |
| |
| #endif /* WEBP_UTILS_QUANT_LEVELS_H_ */ |
