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_H_ 15#define WEBP_UTILS_QUANT_LEVELS_H_ 16 17#include <stdlib.h> 18 19#include "webp/types.h" 20 21#ifdef __cplusplus 22extern "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). 29int 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_H_ */ 37