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14952 | fschmid | 1 | /* cairo - a vector graphics library with display and print output |
2 | * |
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3 | * Copyright © 2005 Red Hat, Inc |
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4 | * |
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5 | * This library is free software; you can redistribute it and/or |
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6 | * modify it either under the terms of the GNU Lesser General Public |
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7 | * License version 2.1 as published by the Free Software Foundation |
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8 | * (the "LGPL") or, at your option, under the terms of the Mozilla |
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9 | * Public License Version 1.1 (the "MPL"). If you do not alter this |
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10 | * notice, a recipient may use your version of this file under either |
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11 | * the MPL or the LGPL. |
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12 | * |
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13 | * You should have received a copy of the LGPL along with this library |
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14 | * in the file COPYING-LGPL-2.1; if not, write to the Free Software |
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18122 | mrdocs | 15 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
14952 | fschmid | 16 | * You should have received a copy of the MPL along with this library |
17 | * in the file COPYING-MPL-1.1 |
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18 | * |
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19 | * The contents of this file are subject to the Mozilla Public License |
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20 | * Version 1.1 (the "License"); you may not use this file except in |
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21 | * compliance with the License. You may obtain a copy of the License at |
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22 | * http://www.mozilla.org/MPL/ |
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23 | * |
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24 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY |
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25 | * OF ANY KIND, either express or implied. See the LGPL or the MPL for |
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26 | * the specific language governing rights and limitations. |
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27 | * |
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28 | * The Original Code is the cairo graphics library. |
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29 | * |
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30 | * The Initial Developer of the Original Code is Red Hat, Inc. |
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31 | * |
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32 | * Contributor(s): |
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33 | * Carl Worth <cworth@cworth.org> |
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34 | */ |
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35 | |||
36 | #include "cairoint.h" |
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37 | |||
38 | void |
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39 | _cairo_stroke_style_init (cairo_stroke_style_t *style) |
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40 | { |
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41 | VG (VALGRIND_MAKE_MEM_UNDEFINED (style, sizeof (cairo_stroke_style_t))); |
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42 | |||
43 | style->line_width = CAIRO_GSTATE_LINE_WIDTH_DEFAULT; |
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44 | style->line_cap = CAIRO_GSTATE_LINE_CAP_DEFAULT; |
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45 | style->line_join = CAIRO_GSTATE_LINE_JOIN_DEFAULT; |
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46 | style->miter_limit = CAIRO_GSTATE_MITER_LIMIT_DEFAULT; |
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47 | |||
48 | style->dash = NULL; |
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49 | style->num_dashes = 0; |
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50 | style->dash_offset = 0.0; |
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51 | } |
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52 | |||
53 | cairo_status_t |
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54 | _cairo_stroke_style_init_copy (cairo_stroke_style_t *style, |
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55 | cairo_stroke_style_t *other) |
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56 | { |
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57 | if (CAIRO_INJECT_FAULT ()) |
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58 | return _cairo_error (CAIRO_STATUS_NO_MEMORY); |
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59 | |||
60 | VG (VALGRIND_MAKE_MEM_UNDEFINED (style, sizeof (cairo_stroke_style_t))); |
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61 | |||
62 | style->line_width = other->line_width; |
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63 | style->line_cap = other->line_cap; |
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64 | style->line_join = other->line_join; |
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65 | style->miter_limit = other->miter_limit; |
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66 | |||
67 | style->num_dashes = other->num_dashes; |
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68 | |||
69 | if (other->dash == NULL) { |
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70 | style->dash = NULL; |
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71 | } else { |
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72 | style->dash = _cairo_malloc_ab (style->num_dashes, sizeof (double)); |
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73 | if (unlikely (style->dash == NULL)) |
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74 | return _cairo_error (CAIRO_STATUS_NO_MEMORY); |
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75 | |||
76 | memcpy (style->dash, other->dash, |
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77 | style->num_dashes * sizeof (double)); |
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78 | } |
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79 | |||
80 | style->dash_offset = other->dash_offset; |
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81 | |||
82 | return CAIRO_STATUS_SUCCESS; |
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83 | } |
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84 | |||
85 | void |
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86 | _cairo_stroke_style_fini (cairo_stroke_style_t *style) |
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87 | { |
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88 | if (style->dash) { |
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89 | free (style->dash); |
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90 | style->dash = NULL; |
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91 | } |
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92 | style->num_dashes = 0; |
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93 | |||
94 | VG (VALGRIND_MAKE_MEM_NOACCESS (style, sizeof (cairo_stroke_style_t))); |
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95 | } |
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96 | |||
97 | /* |
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98 | * For a stroke in the given style, compute the maximum distance |
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99 | * from the path that vertices could be generated. In the case |
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100 | * of rotation in the ctm, the distance will not be exact. |
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101 | */ |
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102 | void |
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103 | _cairo_stroke_style_max_distance_from_path (const cairo_stroke_style_t *style, |
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104 | const cairo_matrix_t *ctm, |
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105 | double *dx, double *dy) |
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106 | { |
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107 | double style_expansion = 0.5; |
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108 | |||
109 | if (style->line_cap == CAIRO_LINE_CAP_SQUARE) |
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110 | style_expansion = M_SQRT1_2; |
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111 | |||
112 | if (style->line_join == CAIRO_LINE_JOIN_MITER && |
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113 | style_expansion < M_SQRT2 * style->miter_limit) |
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114 | { |
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115 | style_expansion = M_SQRT2 * style->miter_limit; |
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116 | } |
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117 | |||
118 | style_expansion *= style->line_width; |
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119 | |||
120 | *dx = style_expansion * hypot (ctm->xx, ctm->xy); |
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121 | *dy = style_expansion * hypot (ctm->yy, ctm->yx); |
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122 | } |