| J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1996 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | /* |
| 27 | * This file contains utility macros used by the Floyd-Steinberg |
| 28 | * algorithms used in some of the other include files. |
| 29 | */ |
| 30 | |
| 31 | #ifndef IMG_FSUTIL_H |
| 32 | #define IMG_FSUTIL_H |
| 33 | |
| 34 | #define DitherDist(ep, e1, e2, e3, ec, c) \ |
| 35 | do { \ |
| 36 | e3 = (ec << 1); \ |
| 37 | e1 = e3 + ec; \ |
| 38 | e2 = e3 + e1; \ |
| 39 | e3 += e2; \ |
| 40 | \ |
| 41 | ep[0].c += e1 >>= 4; \ |
| 42 | ep[1].c += e2 >>= 4; \ |
| 43 | ep[2].c += e3 >>= 4; \ |
| 44 | ec -= e1 + e2 + e3; \ |
| 45 | } while (0) |
| 46 | |
| 47 | #endif /* IMG_FSUTIL_H */ |