1 /* 2 * Copyright (c) 2008, 2010, 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 #ifndef ParallelogramUtils_h_Included 27 #define ParallelogramUtils_h_Included 28 29 #ifdef __cplusplus 30 extern "C" { 31 #endif 32 33 #define PGRAM_MIN_MAX(bmin, bmax, v0, dv1, dv2, AA) \ 34 do { \ 35 double vmin, vmax; \ 36 if (dv1 < 0) { \ 37 vmin = v0+dv1; \ 38 vmax = v0; \ 39 } else { \ 40 vmin = v0; \ 41 vmax = v0+dv1; \ 42 } \ 43 if (dv2 < 0) { \ 44 vmin += dv2; \ 45 } else { \ 46 vmax += dv2; \ 47 } \ 48 if (AA) { \ 49 bmin = (jint) floor(vmin); \ 50 bmax = (jint) ceil(vmax); \ 51 } else { \ 52 bmin = (jint) floor(vmin + 0.5); \ 53 bmax = (jint) floor(vmax + 0.5); \ 54 } \ 55 } while(0) 56 57 #define PGRAM_INIT_X(starty, x, y, slope) \ 58 (DblToLong((x) + (slope) * ((starty)+0.5 - (y))) + LongOneHalf - 1) 59 60 /* 61 * Sort parallelogram by y values, ensure that each delta vector 62 * has a non-negative y delta. 63 */ 64 #define SORT_PGRAM(x0, y0, dx1, dy1, dx2, dy2, OTHER_SWAP_CODE) \ 65 do { \ 66 if (dy1 < 0) { \ 67 x0 += dx1; y0 += dy1; \ 68 dx1 = -dx1; dy1 = -dy1; \ 69 } \ 70 if (dy2 < 0) { \ 71 x0 += dx2; y0 += dy2; \ 72 dx2 = -dx2; dy2 = -dy2; \ 73 } \ 74 /* Sort delta vectors so dxy1 is left of dxy2. */ \ 75 if (dx1 * dy2 > dx2 * dy1) { \ 76 double v; \ 77 v = dx1; dx1 = dx2; dx2 = v; \ 78 v = dy1; dy1 = dy2; dy2 = v; \ 79 OTHER_SWAP_CODE \ 80 } \ 81 } while(0) 82 83 #endif /* ParallelogramUtils_h_Included */ 84