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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | pj | 1 | /* |
| 2 | * Copyright (c) 1995 The Regents of the University of California. |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Permission to use, copy, modify, and distribute this software and its |
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| 6 | * documentation for any purpose, without fee, and without written agreement is |
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| 7 | * hereby granted, provided that the above copyright notice and the following |
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| 8 | * two paragraphs appear in all copies of this software. |
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| 9 | * |
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| 10 | * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR |
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| 11 | * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT |
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| 12 | * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF |
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| 13 | * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 14 | * |
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| 15 | * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES, |
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| 16 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY |
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| 17 | * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
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| 18 | * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO |
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| 19 | * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
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| 20 | */ |
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| 21 | |||
| 22 | extern int LUM_RANGE; |
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| 23 | extern int CR_RANGE; |
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| 24 | extern int CB_RANGE; |
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| 25 | |||
| 26 | |||
| 27 | #define CB_BASE 1 |
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| 28 | #define CR_BASE (CB_BASE*CB_RANGE) |
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| 29 | #define LUM_BASE (CR_BASE*CR_RANGE) |
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| 30 | |||
| 31 | extern unsigned char pixel[256]; |
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| 32 | extern unsigned long wpixel[256]; |
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| 33 | extern int *lum_values; |
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| 34 | extern int *cr_values; |
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| 35 | extern int *cb_values; |
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| 36 | |||
| 37 | #define Min(x,y) (((x) < (y)) ? (x) : (y)) |
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| 38 | #define Max(x,y) (((x) > (y)) ? (x) : (y)) |
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| 39 | |||
| 40 | #define GAMMA_CORRECTION(x) ((int)(pow((x) / 255.0, 1.0 / gammaCorrect) * 255.0)) |
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| 41 | #define CHROMA_CORRECTION256(x) ((x) >= 128 \ |
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| 42 | ? 128 + Min(127, (int)(((x) - 128.0) * chromaCorrect)) \ |
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| 43 | : 128 - Min(128, (int)((128.0 - (x)) * chromaCorrect))) |
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| 44 | #define CHROMA_CORRECTION128(x) ((x) >= 0 \ |
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| 45 | ? Min(127, (int)(((x) * chromaCorrect))) \ |
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| 46 | : Max(-128, (int)(((x) * chromaCorrect)))) |
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| 47 | #define CHROMA_CORRECTION256D(x) ((x) >= 128 \ |
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| 48 | ? 128.0 + Min(127.0, (((x) - 128.0) * chromaCorrect)) \ |
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| 49 | : 128.0 - Min(128.0, (((128.0 - (x)) * chromaCorrect)))) |
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| 50 | #define CHROMA_CORRECTION128D(x) ((x) >= 0 \ |
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| 51 | ? Min(127.0, ((x) * chromaCorrect)) \ |
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| 52 | : Max(-128.0, ((x) * chromaCorrect))) |
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| 53 |