third_party/libwebp/utils/quant_levels_dec.h

   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@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_ */