1 // Copyright 2011 Google Inc. All Rights Reserved. 2 // 3 // This code is licensed under the same terms as WebM: 4 // Software License Agreement: http://www.webmproject.org/license/software/ 5 // Additional IP Rights Grant: http://www.webmproject.org/license/additional/ 6 // ----------------------------------------------------------------------------- 7 // 8 // Alpha plane quantization utility 9 // 10 // Author: Vikas Arora (vikasa@google.com) 11 12 #ifndef WEBP_UTILS_QUANT_LEVELS_H_ 13 #define WEBP_UTILS_QUANT_LEVELS_H_ 14 15 #include <stdlib.h> 16 17 #include "webp/types.h" 18 19 #if defined(__cplusplus) || defined(c_plusplus) 20 extern "C" { 21 #endif 22 23 // Replace the input 'data' of size 'width'x'height' with 'num-levels' 24 // quantized values. If not NULL, 'sse' will contain the sum of squared error. 25 // Valid range for 'num_levels' is [2, 256]. 26 // Returns false in case of error (data is NULL, or parameters are invalid). 27 int QuantizeLevels(uint8_t* const data, int width, int height, int num_levels, 28 uint64_t* const sse); 29 30 #if defined(__cplusplus) || defined(c_plusplus) 31 } // extern "C" 32 #endif 33 34 #endif /* WEBP_UTILS_QUANT_LEVELS_H_ */ 35