[17276] | 1 | /* |
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| 2 | rsvg-bpath-util.c: Data structure and convenience functions for creating bezier paths. |
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| 3 | |
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| 4 | Copyright (C) 2000 Eazel, Inc. |
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| 5 | |
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| 6 | This program is free software; you can redistribute it and/or |
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[18274] | 7 | modify it under the terms of the GNU Library General Public License as |
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[17276] | 8 | published by the Free Software Foundation; either version 2 of the |
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| 9 | License, or (at your option) any later version. |
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| 10 | |
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| 11 | This program is distributed in the hope that it will be useful, |
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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[18274] | 14 | Library General Public License for more details. |
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[17276] | 15 | |
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[18274] | 16 | You should have received a copy of the GNU Library General Public |
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[17276] | 17 | License along with this program; if not, write to the |
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| 18 | Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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| 19 | Boston, MA 02111-1307, USA. |
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| 20 | |
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| 21 | Author: Raph Levien <raph@artofcode.com> |
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| 22 | */ |
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| 23 | |
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[18274] | 24 | #include "config.h" |
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| 25 | #include "rsvg-bpath-util.h" |
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| 26 | |
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| 27 | #include <glib/gmem.h> |
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| 28 | #include <glib/gmessages.h> |
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[17276] | 29 | #include <math.h> |
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| 30 | #include <string.h> |
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| 31 | |
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| 32 | /* This is adapted from gnome-canvas-bpath-util in libgnomeprint |
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| 33 | (originally developed as part of Gill). */ |
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| 34 | |
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| 35 | RsvgBpathDef * |
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| 36 | rsvg_bpath_def_new (void) |
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| 37 | { |
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| 38 | RsvgBpathDef *bpd; |
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| 39 | |
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| 40 | bpd = g_new (RsvgBpathDef, 1); |
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| 41 | bpd->n_bpath = 0; |
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| 42 | bpd->n_bpath_max = 16; |
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| 43 | bpd->moveto_idx = -1; |
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| 44 | bpd->bpath = g_new (ArtBpath, bpd->n_bpath_max); |
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| 45 | bpd->ref_count = 1; |
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| 46 | |
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| 47 | return bpd; |
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| 48 | } |
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| 49 | |
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| 50 | RsvgBpathDef * |
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| 51 | rsvg_bpath_def_new_from (ArtBpath *path) |
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| 52 | { |
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| 53 | RsvgBpathDef *bpd; |
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| 54 | int i; |
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| 55 | |
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| 56 | g_return_val_if_fail (path != NULL, NULL); |
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| 57 | |
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| 58 | for (i = 0; path[i].code != ART_END; i++) |
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| 59 | ; |
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| 60 | if (i <= 0) |
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| 61 | return rsvg_bpath_def_new (); |
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| 62 | |
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| 63 | bpd = g_new (RsvgBpathDef, 1); |
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| 64 | |
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| 65 | bpd->n_bpath = i; |
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| 66 | bpd->n_bpath_max = i; |
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| 67 | bpd->moveto_idx = -1; |
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| 68 | bpd->ref_count = 1; |
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| 69 | bpd->bpath = g_new (ArtBpath, i); |
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| 70 | |
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| 71 | memcpy (bpd->bpath, path, i * sizeof (ArtBpath)); |
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| 72 | return bpd; |
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| 73 | } |
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| 74 | |
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| 75 | RsvgBpathDef * |
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| 76 | rsvg_bpath_def_ref (RsvgBpathDef *bpd) |
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| 77 | { |
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| 78 | g_return_val_if_fail (bpd != NULL, NULL); |
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| 79 | |
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| 80 | bpd->ref_count += 1; |
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| 81 | return bpd; |
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| 82 | } |
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| 83 | |
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| 84 | void |
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| 85 | rsvg_bpath_def_free (RsvgBpathDef *bpd) |
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| 86 | { |
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| 87 | g_return_if_fail (bpd != NULL); |
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| 88 | |
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| 89 | bpd->ref_count -= 1; |
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| 90 | if (bpd->ref_count == 0) |
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| 91 | { |
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| 92 | g_free (bpd->bpath); |
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| 93 | g_free (bpd); |
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| 94 | } |
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| 95 | } |
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| 96 | |
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| 97 | void |
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| 98 | rsvg_bpath_def_moveto (RsvgBpathDef *bpd, double x, double y) |
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| 99 | { |
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| 100 | ArtBpath *bpath; |
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| 101 | int n_bpath; |
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| 102 | |
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| 103 | g_return_if_fail (bpd != NULL); |
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| 104 | |
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| 105 | n_bpath = bpd->n_bpath++; |
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| 106 | |
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| 107 | if (n_bpath == bpd->n_bpath_max) |
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| 108 | bpd->bpath = g_realloc (bpd->bpath, |
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| 109 | (bpd->n_bpath_max <<= 1) * sizeof (ArtBpath)); |
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| 110 | bpath = bpd->bpath; |
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| 111 | bpath[n_bpath].code = ART_MOVETO_OPEN; |
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| 112 | bpath[n_bpath].x3 = x; |
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| 113 | bpath[n_bpath].y3 = y; |
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| 114 | bpd->moveto_idx = n_bpath; |
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| 115 | } |
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| 116 | |
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| 117 | void |
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| 118 | rsvg_bpath_def_lineto (RsvgBpathDef *bpd, double x, double y) |
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| 119 | { |
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| 120 | ArtBpath *bpath; |
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| 121 | int n_bpath; |
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| 122 | |
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| 123 | g_return_if_fail (bpd != NULL); |
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| 124 | g_return_if_fail (bpd->moveto_idx >= 0); |
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| 125 | |
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| 126 | n_bpath = bpd->n_bpath++; |
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| 127 | |
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| 128 | if (n_bpath == bpd->n_bpath_max) |
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| 129 | bpd->bpath = g_realloc (bpd->bpath, |
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| 130 | (bpd->n_bpath_max <<= 1) * sizeof (ArtBpath)); |
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| 131 | bpath = bpd->bpath; |
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| 132 | bpath[n_bpath].code = ART_LINETO; |
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| 133 | bpath[n_bpath].x3 = x; |
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| 134 | bpath[n_bpath].y3 = y; |
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| 135 | } |
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| 136 | |
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| 137 | void |
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| 138 | rsvg_bpath_def_curveto (RsvgBpathDef *bpd, double x1, double y1, double x2, double y2, double x3, double y3) |
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| 139 | { |
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| 140 | ArtBpath *bpath; |
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| 141 | int n_bpath; |
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| 142 | |
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| 143 | g_return_if_fail (bpd != NULL); |
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| 144 | g_return_if_fail (bpd->moveto_idx >= 0); |
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| 145 | |
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| 146 | n_bpath = bpd->n_bpath++; |
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| 147 | |
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| 148 | if (n_bpath == bpd->n_bpath_max) |
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| 149 | bpd->bpath = g_realloc (bpd->bpath, |
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| 150 | (bpd->n_bpath_max <<= 1) * sizeof (ArtBpath)); |
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| 151 | bpath = bpd->bpath; |
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| 152 | bpath[n_bpath].code = ART_CURVETO; |
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| 153 | bpath[n_bpath].x1 = x1; |
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| 154 | bpath[n_bpath].y1 = y1; |
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| 155 | bpath[n_bpath].x2 = x2; |
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| 156 | bpath[n_bpath].y2 = y2; |
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| 157 | bpath[n_bpath].x3 = x3; |
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| 158 | bpath[n_bpath].y3 = y3; |
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| 159 | } |
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| 160 | |
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| 161 | void |
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| 162 | rsvg_bpath_def_closepath (RsvgBpathDef *bpd) |
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| 163 | { |
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| 164 | ArtBpath *bpath; |
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| 165 | int n_bpath; |
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| 166 | |
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| 167 | g_return_if_fail (bpd != NULL); |
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| 168 | g_return_if_fail (bpd->moveto_idx >= 0); |
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| 169 | g_return_if_fail (bpd->n_bpath > 0); |
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| 170 | |
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| 171 | bpath = bpd->bpath; |
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| 172 | n_bpath = bpd->n_bpath; |
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| 173 | |
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| 174 | /* Add closing vector if we need it. */ |
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| 175 | if (bpath[n_bpath - 1].x3 != bpath[bpd->moveto_idx].x3 || |
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| 176 | bpath[n_bpath - 1].y3 != bpath[bpd->moveto_idx].y3) |
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| 177 | { |
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| 178 | rsvg_bpath_def_lineto (bpd, bpath[bpd->moveto_idx].x3, |
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| 179 | bpath[bpd->moveto_idx].y3); |
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| 180 | bpath = bpd->bpath; |
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| 181 | } |
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| 182 | bpath[bpd->moveto_idx].code = ART_MOVETO; |
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| 183 | bpd->moveto_idx = -1; |
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| 184 | } |
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| 185 | |
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| 186 | void |
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| 187 | rsvg_bpath_def_art_finish (RsvgBpathDef *bpd) |
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| 188 | { |
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| 189 | int n_bpath; |
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| 190 | |
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| 191 | g_return_if_fail (bpd != NULL); |
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| 192 | |
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| 193 | n_bpath = bpd->n_bpath++; |
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| 194 | |
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| 195 | if (n_bpath == bpd->n_bpath_max) |
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| 196 | bpd->bpath = g_realloc (bpd->bpath, |
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| 197 | (bpd->n_bpath_max <<= 1) * sizeof (ArtBpath)); |
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| 198 | bpd->bpath[n_bpath].code = ART_END; |
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| 199 | } |
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