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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 // Utilities for processing transparent channel. |
| 11 // |
| 12 // Author: Skal (pascal.massimino@gmail.com) |
| 13 |
| 14 #ifndef WEBP_UTILS_ALPHA_PROCESSING_H_ |
| 15 #define WEBP_UTILS_ALPHA_PROCESSING_H_ |
| 16 |
| 17 #include "../webp/types.h" |
| 18 |
| 19 #ifdef __cplusplus |
| 20 extern "C" { |
| 21 #endif |
| 22 |
| 23 // Pre-Multiply operation transforms x into x * A / 255 (where x=Y,R,G or B). |
| 24 // Un-Multiply operation transforms x into x * 255 / A. |
| 25 |
| 26 // Pre-Multiply or Un-Multiply (if 'inverse' is true) argb values in a row. |
| 27 void WebPMultARGBRow(uint32_t* const ptr, int width, int inverse); |
| 28 |
| 29 // Same a WebPMultARGBRow(), but for several rows. |
| 30 void WebPMultARGBRows(uint8_t* ptr, int stride, int width, int num_rows, |
| 31 int inverse); |
| 32 |
| 33 // Same for a row of single values, with side alpha values. |
| 34 void WebPMultRow(uint8_t* const ptr, const uint8_t* const alpha, |
| 35 int width, int inverse); |
| 36 |
| 37 // Same a WebPMultRow(), but for several 'num_rows' rows. |
| 38 void WebPMultRows(uint8_t* ptr, int stride, |
| 39 const uint8_t* alpha, int alpha_stride, |
| 40 int width, int num_rows, int inverse); |
| 41 |
| 42 #ifdef __cplusplus |
| 43 } // extern "C" |
| 44 #endif |
| 45 |
| 46 #endif // WEBP_UTILS_ALPHA_PROCESSING_H_ |
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