Mercurial > MadButterfly

annotate src/graph_engine_cairo.c @ 1067:7b4e80ab671a openvg

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merge from default branch
author Thinker K.F. Li <thinker@codemud.net>
date Wed, 01 Dec 2010 12:25:56 +0800
parents ac2e6468a22a 74e3ba4d3fa1
children d09f603438d8
rev   line source
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parents: 480
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1 // -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 4; -*-
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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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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, *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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29 FC_SLANT_ROMAN,
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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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34 ptn = FcPatternCreate();
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35 if(ptn == NULL)
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36 goto err;
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37
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38 val.type = FcTypeString;
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39 val.u.s = family;
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40 FcPatternAdd(ptn, "family", val, FcTrue);
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41
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42 val.type = FcTypeInteger;
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43 val.u.i = slant_map[slant];
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44 FcPatternAdd(ptn, "slant", val, FcTrue);
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45
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46 val.type = FcTypeInteger;
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47 val.u.i = weight;
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48 FcPatternAdd(ptn, "weight", val, FcTrue);
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49
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50 FcDefaultSubstitute(ptn);
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51
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52 r = FcConfigSubstituteWithPat(cfg, ptn, ptn, FcMatchPattern);
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53 if(!r)
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54 goto err;
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55
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56 r = FcConfigSubstituteWithPat(cfg, ptn, ptn, FcMatchFont);
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57 if(!r)
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58 goto err;
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59
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60 fn_ptn = FcFontMatch(cfg, ptn, &result);
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61
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62 /* It is supposed to return FcResultMatch. But, it is no, now.
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63 * I don't know why. Someone should figure out the issue.
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64 */
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65 #if 0
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66 if(result != FcResultMatch) {
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67 printf("%d %d\n", result, FcResultMatch);
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68 goto err;
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69 }
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70 #endif
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71 if(fn_ptn == NULL)
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72 goto err;
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73
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74 FcPatternDestroy(ptn);
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75
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76 return fn_ptn;
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77
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78 err:
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79 if(ptn)
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80 FcPatternDestroy(ptn);
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81 return NULL;
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82
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83 }
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84
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85 /*! \brief Find out a font face for a pattern specified.
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86 *
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87 * The pattern, here, is a vector of family, slant, and weight.
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88 * This function base on fontconfig and cairo FreeType font supporting.
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89 * You can replace this function with other font mechanisms.
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90 */
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91 mbe_font_face_t *
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92 mbe_query_font_face(const char *family, int slant, int weight) {
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93 mbe_font_face_t *cface;
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94 FcPattern *ptn;
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95
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96 ptn = query_font_pattern(family, slant, weight);
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97 cface = cairo_ft_font_face_create_for_pattern(ptn);
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98 FcPatternDestroy(ptn);
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99
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100 return cface;
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101 }
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102
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103 void
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104 mbe_free_font_face(mbe_font_face_t *face) {
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105 ASSERT(face == NULL);
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106
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107 mbe_font_face_destroy(face);
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108 }
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109
480
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110 mbe_pattern_t *
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111 mbe_pattern_create_radial(co_aix cx0, co_aix cy0, co_aix radius0,
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112 co_aix cx1, co_aix cy1, co_aix radius1,
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113 grad_stop_t *stops, int stop_cnt) {
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114 cairo_pattern_t *ptn;
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115 grad_stop_t *stop;
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116 int i;
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117
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118 ptn = cairo_pattern_create_radial(cx0, cy0, radius0,
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119 cx1, cy1, radius1);
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120 if(ptn == NULL)
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121 return NULL;
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122
480
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123 stop = stops;
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124 for(i = 0; i < stop_cnt; i++) {
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125 cairo_pattern_add_color_stop_rgba(ptn, stop->offset,
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126 stop->r, stop->g, stop->b, stop->a);
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127 stop++;
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128 }
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129
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130 return ptn;
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131 }
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132
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133 mbe_pattern_t *
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134 mbe_pattern_create_linear(co_aix x0, co_aix y0, co_aix x1, co_aix y1,
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135 grad_stop_t *stops, int stop_cnt) {
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136 cairo_pattern_t *ptn;
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137 grad_stop_t *stop;
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138 int i;
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139
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140 ptn = cairo_pattern_create_linear(x0, y0, x1, y1);
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141 if(ptn == NULL)
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142 return NULL;
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143
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144 stop = stops;
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Thinker K.F. Li <thinker@branda.to>
parents: 469
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145 for(i = 0; i < stop_cnt; i++) {
e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
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146 cairo_pattern_add_color_stop_rgba(ptn, stop->offset,
e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
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147 stop->r, stop->g, stop->b, stop->a);
e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
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148 stop++;
e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
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149 }
e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
diff changeset
150
e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
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151 return ptn;
e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
diff changeset
152 }