Mercurial > MadButterfly

annotate src/graph_engine_cairo.c @ 586:b42d69ab8857 openvg

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Replace mbe_clip() with mbe_scissoring()
author Thinker K.F. Li <thinker@branda.to>
date Wed, 30 Jun 2010 13:28:53 +0800
parents e813ac222f48
children ac2e6468a22a
rev   line source
465
d8181696b689 Move functions into graphic engine layers.
Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
1 #include <fontconfig/fontconfig.h>
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e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
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2 #include <cairo-ft.h>
465
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Thinker K.F. Li <thinker@branda.to>
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3 #include "mb_graph_engine_cairo.h"
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Thinker K.F. Li <thinker@branda.to>
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4 #include "mb_shapes.h"
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5
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6 #ifndef ASSERT
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7 #define ASSERT(x)
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8 #endif
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9
d8181696b689 Move functions into graphic engine layers.
Thinker K.F. Li <thinker@branda.to>
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10 /*! \brief Find out a font pattern.
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Thinker K.F. Li <thinker@branda.to>
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11 *
d8181696b689 Move functions into graphic engine layers.
Thinker K.F. Li <thinker@branda.to>
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12 * This function use fontconfig to decide a font file in pattern. It can
d8181696b689 Move functions into graphic engine layers.
Thinker K.F. Li <thinker@branda.to>
parents:
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13 * replaced by other mechanism if you think it is not what you want.
d8181696b689 Move functions into graphic engine layers.
Thinker K.F. Li <thinker@branda.to>
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14 *
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Thinker K.F. Li <thinker@branda.to>
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15 * \param slant make font prune if it it non-zero.
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Thinker K.F. Li <thinker@branda.to>
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16 * \param weight make font normal if it is 100.
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Thinker K.F. Li <thinker@branda.to>
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17 */
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Thinker K.F. Li <thinker@branda.to>
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18 static
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Thinker K.F. Li <thinker@branda.to>
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19 FcPattern *query_font_pattern(const char *family, int slant, int weight) {
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Thinker K.F. Li <thinker@branda.to>
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20 FcPattern *ptn, *p, *fn_ptn;
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21 FcValue val;
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Thinker K.F. Li <thinker@branda.to>
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22 FcConfig *cfg;
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23 FcBool r;
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Thinker K.F. Li <thinker@branda.to>
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24 FcResult result;
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Thinker K.F. Li <thinker@branda.to>
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25 static int slant_map[] = { /* from MB_FONT_SLANT_* to FC_SLANT_* */
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Thinker K.F. Li <thinker@branda.to>
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26 FC_SLANT_ROMAN,
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Thinker K.F. Li <thinker@branda.to>
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27 FC_SLANT_ROMAN,
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Thinker K.F. Li <thinker@branda.to>
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28 FC_SLANT_ITALIC,
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Thinker K.F. Li <thinker@branda.to>
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29 FC_SLANT_OBLIQUE};
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30
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Thinker K.F. Li <thinker@branda.to>
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31 cfg = FcConfigGetCurrent();
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Thinker K.F. Li <thinker@branda.to>
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32 ptn = FcPatternCreate();
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Thinker K.F. Li <thinker@branda.to>
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33 p = FcPatternCreate();
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Thinker K.F. Li <thinker@branda.to>
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34 if(ptn == NULL || p == NULL)
d8181696b689 Move functions into graphic engine layers.
Thinker K.F. Li <thinker@branda.to>
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35 goto err;
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Thinker K.F. Li <thinker@branda.to>
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36
d8181696b689 Move functions into graphic engine layers.
Thinker K.F. Li <thinker@branda.to>
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37 val.type = FcTypeString;
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Thinker K.F. Li <thinker@branda.to>
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38 val.u.s = family;
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Thinker K.F. Li <thinker@branda.to>
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39 FcPatternAdd(ptn, "family", val, FcTrue);
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40
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Thinker K.F. Li <thinker@branda.to>
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41 val.type = FcTypeInteger;
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Thinker K.F. Li <thinker@branda.to>
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42 val.u.i = slant_map[slant];
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Thinker K.F. Li <thinker@branda.to>
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43 FcPatternAdd(ptn, "slant", val, FcTrue);
d8181696b689 Move functions into graphic engine layers.
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44
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Thinker K.F. Li <thinker@branda.to>
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45 val.type = FcTypeInteger;
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Thinker K.F. Li <thinker@branda.to>
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46 val.u.i = weight;
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Thinker K.F. Li <thinker@branda.to>
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47 FcPatternAdd(ptn, "weight", val, FcTrue);
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48
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Thinker K.F. Li <thinker@branda.to>
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49 r = FcConfigSubstituteWithPat(cfg, ptn, NULL, FcMatchPattern);
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Thinker K.F. Li <thinker@branda.to>
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50 if(!r)
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Thinker K.F. Li <thinker@branda.to>
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51 goto err;
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52
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53 r = FcConfigSubstituteWithPat(cfg, p, ptn, FcMatchFont);
d8181696b689 Move functions into graphic engine layers.
Thinker K.F. Li <thinker@branda.to>
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54 if(!r)
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Thinker K.F. Li <thinker@branda.to>
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55 goto err;
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56
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Thinker K.F. Li <thinker@branda.to>
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57 FcDefaultSubstitute(p);
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58
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59 fn_ptn = FcFontMatch(cfg, p, &result);
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60
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Thinker K.F. Li <thinker@branda.to>
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61 /* It is supposed to return FcResultMatch. But, it is no, now.
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62 * I don't know why. Someone should figure out the issue.
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63 */
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64 #if 0
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65 if(result != FcResultMatch) {
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66 printf("%d %d\n", result, FcResultMatch);
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67 goto err;
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68 }
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69 #endif
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70 if(fn_ptn == NULL)
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71 goto err;
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72
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73 FcPatternDestroy(ptn);
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74 FcPatternDestroy(p);
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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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Thinker K.F. Li <thinker@branda.to>
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79 if(ptn)
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Thinker K.F. Li <thinker@branda.to>
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80 FcPatternDestroy(ptn);
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81 if(p)
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82 FcPatternDestroy(p);
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Thinker K.F. Li <thinker@branda.to>
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83 return NULL;
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84
d8181696b689 Move functions into graphic engine layers.
Thinker K.F. Li <thinker@branda.to>
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85 }
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86
d8181696b689 Move functions into graphic engine layers.
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87 /*! \brief Find out a font face for a pattern specified.
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88 *
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89 * The pattern, here, is a vector of family, slant, and weight.
d8181696b689 Move functions into graphic engine layers.
Thinker K.F. Li <thinker@branda.to>
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90 * This function base on fontconfig and cairo FreeType font supporting.
d8181696b689 Move functions into graphic engine layers.
Thinker K.F. Li <thinker@branda.to>
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91 * You can replace this function with other font mechanisms.
d8181696b689 Move functions into graphic engine layers.
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92 */
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Thinker K.F. Li <thinker@branda.to>
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93 mbe_font_face_t *
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94 mbe_query_font_face(const char *family, int slant, int weight) {
d8181696b689 Move functions into graphic engine layers.
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95 mbe_font_face_t *cface;
d8181696b689 Move functions into graphic engine layers.
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96 FcPattern *ptn;
d8181696b689 Move functions into graphic engine layers.
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97
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98 ptn = query_font_pattern(family, slant, weight);
469
4dc0be6c044a Add copy and clear graphic engine functions.
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parents: 465
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99 cface = cairo_ft_font_face_create_for_pattern(ptn);
465
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100 FcPatternDestroy(ptn);
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101
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102 return cface;
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103 }
d8181696b689 Move functions into graphic engine layers.
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104
d8181696b689 Move functions into graphic engine layers.
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105 void
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106 mbe_free_font_face(mbe_font_face_t *face) {
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107 ASSERT(face == NULL);
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108
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109 mbe_font_face_destroy(face);
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110 }
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111
480
e813ac222f48 Merge add colors into constructor of gradient pattern.
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parents: 469
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112 mbe_pattern_t *
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113 mbe_pattern_create_radial(co_aix cx0, co_aix cy0, co_aix radius0,
e813ac222f48 Merge add colors into constructor of gradient pattern.
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114 co_aix cx1, co_aix cy1, co_aix radius1,
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parents: 469
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115 grad_stop_t *stops, int stop_cnt) {
e813ac222f48 Merge add colors into constructor of gradient pattern.
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parents: 469
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116 cairo_pattern_t *ptn;
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parents: 469
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117 grad_stop_t *stop;
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118 int i;
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119
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parents: 469
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120 ptn = cairo_pattern_create_radial(cx0, cy0, radius0,
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parents: 469
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121 cx1, cy1, radius1);
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parents: 469
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122 if(ptn == NULL)
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parents: 469
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123 return NULL;
e813ac222f48 Merge add colors into constructor of gradient pattern.
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parents: 469
diff changeset
124
e813ac222f48 Merge add colors into constructor of gradient pattern.
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parents: 469
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125 stop = stops;
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Thinker K.F. Li <thinker@branda.to>
parents: 469
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126 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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127 cairo_pattern_add_color_stop_rgba(ptn, stop->offset,
e813ac222f48 Merge add colors into constructor of gradient pattern.
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parents: 469
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128 stop->r, stop->g, stop->b, stop->a);
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129 stop++;
e813ac222f48 Merge add colors into constructor of gradient pattern.
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parents: 469
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130 }
e813ac222f48 Merge add colors into constructor of gradient pattern.
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parents: 469
diff changeset
131
e813ac222f48 Merge add colors into constructor of gradient pattern.
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parents: 469
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132 return ptn;
e813ac222f48 Merge add colors into constructor of gradient pattern.
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parents: 469
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133 }
e813ac222f48 Merge add colors into constructor of gradient pattern.
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parents: 469
diff changeset
134
e813ac222f48 Merge add colors into constructor of gradient pattern.
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parents: 469
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135 mbe_pattern_t *
e813ac222f48 Merge add colors into constructor of gradient pattern.
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parents: 469
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136 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
137 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
138 cairo_pattern_t *ptn;
e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
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139 grad_stop_t *stop;
e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
diff changeset
140 int i;
e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
diff changeset
141
e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
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142 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
143 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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144 return NULL;
e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
diff changeset
145
e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
diff changeset
146 stop = stops;
e813ac222f48 Merge add colors into constructor of gradient pattern.
Thinker K.F. Li <thinker@branda.to>
parents: 469
diff changeset
147 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
diff changeset
148 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
diff changeset
149 stop->r, stop->g, stop->b, stop->a);
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150 stop++;
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151 }
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152
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153 return ptn;
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154 }
586
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155
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156 void
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157 mbe_scissoring(mbe_t *canvas, int n_areas, area_t **areas) {
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158 area_t *area;
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159 int i;
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160
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161 cairo_new_path(canvas);
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162
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163 for(i = 0; i < n_areas; i++) {
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164 area = areas[i];
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165 cairo_rectangle(canvas, area->x, area->y, area->w, area->h);
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166 }
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167
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168 cairo_clip(canvas);
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169 }