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      1 // Copyright 2013 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 de-quantization utility
     11 //
     12 // Author:  Vikas Arora (vikasa (at) google.com)
     13 
     14 #ifndef WEBP_UTILS_QUANT_LEVELS_DEC_H_
     15 #define WEBP_UTILS_QUANT_LEVELS_DEC_H_
     16 
     17 #include "../webp/types.h"
     18 
     19 #ifdef __cplusplus
     20 extern "C" {
     21 #endif
     22 
     23 // Apply post-processing to input 'data' of size 'width'x'height' assuming that
     24 // the source was quantized to a reduced number of levels.
     25 // Strength is in [0..100] and controls the amount of dithering applied.
     26 // Returns false in case of error (data is NULL, invalid parameters,
     27 // malloc failure, ...).
     28 int WebPDequantizeLevels(uint8_t* const data, int width, int height,
     29                          int strength);
     30 
     31 #ifdef __cplusplus
     32 }    // extern "C"
     33 #endif
     34 
     35 #endif  /* WEBP_UTILS_QUANT_LEVELS_DEC_H_ */
     36