Mercurial > MadButterfly

annotate src/graph_engine_cairo.c @ 880:ac3e8492ad74 abs_n_rel_center

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Formalize path data for MadButterfly. Inkscape and other editors would omit 'l' or 'L' after 'm' or 'M'. MadButterfly can not handle it, now. So, we work around it at SVG parser.
author Thinker K.F. Li <thinker@codemud.net>
date Sat, 25 Sep 2010 18:46:37 +0800
parents 586e50f82c1f
children 74e3ba4d3fa1
rev   line source
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586e50f82c1f Unify coding style tag for emacs and vim.
Shih-Yuan Lee (FourDollars) <fourdollars@gmail.com>
parents: 480
diff changeset
1 // -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 4; -*-
586e50f82c1f Unify coding style tag for emacs and vim.
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2 // vim: sw=4:ts=8:sts=4
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3 #include <fontconfig/fontconfig.h>
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4 #include <cairo-ft.h>
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5 #include "mb_graph_engine_cairo.h"
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6 #include "mb_shapes.h"
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7
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8 #ifndef ASSERT
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9 #define ASSERT(x)
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10 #endif
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11
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12 /*! \brief Find out a font pattern.
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13 *
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14 * This function use fontconfig to decide a font file in pattern. It can
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15 * replaced by other mechanism if you think it is not what you want.
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16 *
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Thinker K.F. Li <thinker@branda.to>
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17 * \param slant make font prune if it it non-zero.
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18 * \param weight make font normal if it is 100.
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19 */
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20 static
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21 FcPattern *query_font_pattern(const char *family, int slant, int weight) {
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22 FcPattern *ptn, *p, *fn_ptn;
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23 FcValue val;
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24 FcConfig *cfg;
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25 FcBool r;
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26 FcResult result;
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27 static int slant_map[] = { /* from MB_FONT_SLANT_* to FC_SLANT_* */
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28 FC_SLANT_ROMAN,
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Thinker K.F. Li <thinker@branda.to>
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29 FC_SLANT_ROMAN,
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Thinker K.F. Li <thinker@branda.to>
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30 FC_SLANT_ITALIC,
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31 FC_SLANT_OBLIQUE};
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32
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33 cfg = FcConfigGetCurrent();
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Thinker K.F. Li <thinker@branda.to>
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34 ptn = FcPatternCreate();
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Thinker K.F. Li <thinker@branda.to>
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35 p = FcPatternCreate();
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Thinker K.F. Li <thinker@branda.to>
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36 if(ptn == NULL || p == NULL)
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37 goto err;
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38
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Thinker K.F. Li <thinker@branda.to>
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39 val.type = FcTypeString;
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Thinker K.F. Li <thinker@branda.to>
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40 val.u.s = family;
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Thinker K.F. Li <thinker@branda.to>
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41 FcPatternAdd(ptn, "family", val, FcTrue);
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parents: 480
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42
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43 val.type = FcTypeInteger;
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Thinker K.F. Li <thinker@branda.to>
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44 val.u.i = slant_map[slant];
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Thinker K.F. Li <thinker@branda.to>
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45 FcPatternAdd(ptn, "slant", val, FcTrue);
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Shih-Yuan Lee (FourDollars) <fourdollars@gmail.com>
parents: 480
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46
465
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47 val.type = FcTypeInteger;
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48 val.u.i = weight;
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49 FcPatternAdd(ptn, "weight", val, FcTrue);
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50
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51 r = FcConfigSubstituteWithPat(cfg, ptn, NULL, FcMatchPattern);
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52 if(!r)
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53 goto err;
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Shih-Yuan Lee (FourDollars) <fourdollars@gmail.com>
parents: 480
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54
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55 r = FcConfigSubstituteWithPat(cfg, p, ptn, FcMatchFont);
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56 if(!r)
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57 goto err;
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58
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59 FcDefaultSubstitute(p);
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60
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61 fn_ptn = FcFontMatch(cfg, p, &result);
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62
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63 /* It is supposed to return FcResultMatch. But, it is no, now.
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64 * I don't know why. Someone should figure out the issue.
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65 */
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66 #if 0
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67 if(result != FcResultMatch) {
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68 printf("%d %d\n", result, FcResultMatch);
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69 goto err;
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70 }
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71 #endif
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72 if(fn_ptn == NULL)
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73 goto err;
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74
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75 FcPatternDestroy(ptn);
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76 FcPatternDestroy(p);
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parents: 480
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77
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78 return fn_ptn;
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79
465
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80 err:
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81 if(ptn)
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82 FcPatternDestroy(ptn);
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83 if(p)
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84 FcPatternDestroy(p);
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85 return NULL;
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86
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87 }
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88
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89 /*! \brief Find out a font face for a pattern specified.
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90 *
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parents:
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91 * The pattern, here, is a vector of family, slant, and weight.
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92 * This function base on fontconfig and cairo FreeType font supporting.
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93 * You can replace this function with other font mechanisms.
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94 */
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95 mbe_font_face_t *
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96 mbe_query_font_face(const char *family, int slant, int weight) {
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parents:
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97 mbe_font_face_t *cface;
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98 FcPattern *ptn;
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99
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100 ptn = query_font_pattern(family, slant, weight);
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4dc0be6c044a Add copy and clear graphic engine functions.
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101 cface = cairo_ft_font_face_create_for_pattern(ptn);
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102 FcPatternDestroy(ptn);
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103
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104 return cface;
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105 }
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106
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107 void
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108 mbe_free_font_face(mbe_font_face_t *face) {
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parents:
diff changeset
109 ASSERT(face == NULL);
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110
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111 mbe_font_face_destroy(face);
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112 }
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113
480
e813ac222f48 Merge add colors into constructor of gradient pattern.
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parents: 469
diff changeset
114 mbe_pattern_t *
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115 mbe_pattern_create_radial(co_aix cx0, co_aix cy0, co_aix radius0,
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116 co_aix cx1, co_aix cy1, co_aix radius1,
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parents: 469
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117 grad_stop_t *stops, int stop_cnt) {
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parents: 469
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118 cairo_pattern_t *ptn;
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parents: 469
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119 grad_stop_t *stop;
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parents: 469
diff changeset
120 int i;
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parents: 469
diff changeset
121
e813ac222f48 Merge add colors into constructor of gradient pattern.
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parents: 469
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122 ptn = cairo_pattern_create_radial(cx0, cy0, radius0,
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parents: 469
diff changeset
123 cx1, cy1, radius1);
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parents: 469
diff changeset
124 if(ptn == NULL)
e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
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125 return NULL;
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126
480
e813ac222f48 Merge add colors into constructor of gradient pattern.
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diff changeset
127 stop = stops;
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parents: 469
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128 for(i = 0; i < stop_cnt; i++) {
e813ac222f48 Merge add colors into constructor of gradient pattern.
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parents: 469
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129 cairo_pattern_add_color_stop_rgba(ptn, stop->offset,
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parents: 469
diff changeset
130 stop->r, stop->g, stop->b, stop->a);
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131 stop++;
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parents: 469
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132 }
e813ac222f48 Merge add colors into constructor of gradient pattern.
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parents: 469
diff changeset
133
e813ac222f48 Merge add colors into constructor of gradient pattern.
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134 return ptn;
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parents: 469
diff changeset
135 }
e813ac222f48 Merge add colors into constructor of gradient pattern.
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parents: 469
diff changeset
136
e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
diff changeset
137 mbe_pattern_t *
e813ac222f48 Merge add colors into constructor of gradient pattern.
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parents: 469
diff changeset
138 mbe_pattern_create_linear(co_aix x0, co_aix y0, co_aix x1, co_aix y1,
e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
diff changeset
139 grad_stop_t *stops, int stop_cnt) {
e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
diff changeset
140 cairo_pattern_t *ptn;
e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
diff changeset
141 grad_stop_t *stop;
e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
diff changeset
142 int i;
e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
diff changeset
143
e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
diff changeset
144 ptn = cairo_pattern_create_linear(x0, y0, x1, y1);
e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
diff changeset
145 if(ptn == NULL)
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Thinker K.F. Li <thinker@branda.to>
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146 return NULL;
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Thinker K.F. Li <thinker@branda.to>
parents: 469
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147
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Thinker K.F. Li <thinker@branda.to>
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148 stop = stops;
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Thinker K.F. Li <thinker@branda.to>
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149 for(i = 0; i < stop_cnt; i++) {
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Thinker K.F. Li <thinker@branda.to>
parents: 469
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150 cairo_pattern_add_color_stop_rgba(ptn, stop->offset,
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Thinker K.F. Li <thinker@branda.to>
parents: 469
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151 stop->r, stop->g, stop->b, stop->a);
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Thinker K.F. Li <thinker@branda.to>
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152 stop++;
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Thinker K.F. Li <thinker@branda.to>
parents: 469
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153 }
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Thinker K.F. Li <thinker@branda.to>
parents: 469
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154
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Thinker K.F. Li <thinker@branda.to>
parents: 469
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155 return ptn;
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Thinker K.F. Li <thinker@branda.to>
parents: 469
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156 }