1 /* 2 * Copyright (c) 1996, Oracle and/or its affiliates. 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * 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 */ 48