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| 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 // Apply post-processing to input 'data' of size 'width'x'height' assuming |
| 31 // that the source was quantized to a reduced number of levels. |
| 32 // Returns false in case of error (data is NULL, invalid parameters, ...). |
| 33 int DequantizeLevels(uint8_t* const data, int width, int height); |
| 34 |
| 35 #if defined(__cplusplus) || defined(c_plusplus) |
| 36 } // extern "C" |
| 37 #endif |
| 38 |
| 39 #endif /* WEBP_UTILS_QUANT_LEVELS_H_ */ |
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