Mercurial > MadButterfly
annotate src/graph_engine_cairo.c @ 847:dfe28355bded
Fix the location of the text elements.
author | wycc |
---|---|
date | Sun, 19 Sep 2010 19:28:33 +0800 |
parents | 586e50f82c1f |
children | 74e3ba4d3fa1 |
rev | line source |
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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, *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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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 p = FcPatternCreate(); |
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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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39 val.type = FcTypeString; |
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40 val.u.s = family; |
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41 FcPatternAdd(ptn, "family", val, FcTrue); |
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42 |
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43 val.type = FcTypeInteger; |
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44 val.u.i = slant_map[slant]; |
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45 FcPatternAdd(ptn, "slant", val, FcTrue); |
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46 |
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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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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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77 |
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78 return fn_ptn; |
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79 |
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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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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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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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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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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 |
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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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117 grad_stop_t *stops, int stop_cnt) { |
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118 cairo_pattern_t *ptn; |
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119 grad_stop_t *stop; |
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120 int i; |
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121 |
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122 ptn = cairo_pattern_create_radial(cx0, cy0, radius0, |
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123 cx1, cy1, radius1); |
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124 if(ptn == NULL) |
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125 return NULL; |
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126 |
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127 stop = stops; |
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128 for(i = 0; i < stop_cnt; i++) { |
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129 cairo_pattern_add_color_stop_rgba(ptn, stop->offset, |
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130 stop->r, stop->g, stop->b, stop->a); |
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131 stop++; |
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132 } |
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133 |
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134 return ptn; |
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135 } |
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136 |
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137 mbe_pattern_t * |
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138 mbe_pattern_create_linear(co_aix x0, co_aix y0, co_aix x1, co_aix y1, |
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139 grad_stop_t *stops, int stop_cnt) { |
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140 cairo_pattern_t *ptn; |
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141 grad_stop_t *stop; |
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142 int i; |
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143 |
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144 ptn = cairo_pattern_create_linear(x0, y0, x1, y1); |
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145 if(ptn == NULL) |
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146 return NULL; |
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147 |
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148 stop = stops; |
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149 for(i = 0; i < stop_cnt; i++) { |
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150 cairo_pattern_add_color_stop_rgba(ptn, stop->offset, |
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151 stop->r, stop->g, stop->b, stop->a); |
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152 stop++; |
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153 } |
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154 |
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155 return ptn; |
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156 } |