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
30extern "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