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