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annotate src/graph_engine_cairo.c @ 465:d8181696b689 Android_Skia

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Move functions into graphic engine layers. Cairo and Skia have their own header files and C/C++ files. Some functions are refactoried and move into graphic engine layer to make reset of MadButterfly independently from graphic engines.
author Thinker K.F. Li <thinker@branda.to>
date Thu, 12 Nov 2009 21:22:30 +0800
parents
children 4dc0be6c044a
rev   line source
465
d8181696b689 Move functions into graphic engine layers.
Thinker K.F. Li <thinker@branda.to>
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1 #include <fontconfig/fontconfig.h>
d8181696b689 Move functions into graphic engine layers.
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2 #include "mb_graph_engine_cairo.h"
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3 #include "mb_shapes.h"
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4
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5 #ifndef ASSERT
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6 #define ASSERT(x)
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7 #endif
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8
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9 /*! \brief Find out a font pattern.
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10 *
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11 * This function use fontconfig to decide a font file in pattern. It can
d8181696b689 Move functions into graphic engine layers.
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12 * replaced by other mechanism if you think it is not what you want.
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13 *
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14 * \param slant make font prune if it it non-zero.
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15 * \param weight make font normal if it is 100.
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16 */
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17 static
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18 FcPattern *query_font_pattern(const char *family, int slant, int weight) {
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19 FcPattern *ptn, *p, *fn_ptn;
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20 FcValue val;
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21 FcConfig *cfg;
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22 FcBool r;
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23 FcResult result;
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24 static int slant_map[] = { /* from MB_FONT_SLANT_* to FC_SLANT_* */
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25 FC_SLANT_ROMAN,
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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_ITALIC,
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28 FC_SLANT_OBLIQUE};
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29
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30 cfg = FcConfigGetCurrent();
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Thinker K.F. Li <thinker@branda.to>
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31 ptn = FcPatternCreate();
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Thinker K.F. Li <thinker@branda.to>
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32 p = FcPatternCreate();
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Thinker K.F. Li <thinker@branda.to>
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33 if(ptn == NULL || p == NULL)
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34 goto err;
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35
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Thinker K.F. Li <thinker@branda.to>
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36 val.type = FcTypeString;
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Thinker K.F. Li <thinker@branda.to>
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37 val.u.s = family;
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38 FcPatternAdd(ptn, "family", val, FcTrue);
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39
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40 val.type = FcTypeInteger;
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41 val.u.i = slant_map[slant];
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42 FcPatternAdd(ptn, "slant", val, FcTrue);
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43
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44 val.type = FcTypeInteger;
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45 val.u.i = weight;
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46 FcPatternAdd(ptn, "weight", val, FcTrue);
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47
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48 r = FcConfigSubstituteWithPat(cfg, ptn, NULL, FcMatchPattern);
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49 if(!r)
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50 goto err;
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51
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52 r = FcConfigSubstituteWithPat(cfg, p, ptn, FcMatchFont);
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Thinker K.F. Li <thinker@branda.to>
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53 if(!r)
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Thinker K.F. Li <thinker@branda.to>
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54 goto err;
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55
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56 FcDefaultSubstitute(p);
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57
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58 fn_ptn = FcFontMatch(cfg, p, &result);
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59
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60 /* It is supposed to return FcResultMatch. But, it is no, now.
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61 * I don't know why. Someone should figure out the issue.
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62 */
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63 #if 0
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64 if(result != FcResultMatch) {
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65 printf("%d %d\n", result, FcResultMatch);
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66 goto err;
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67 }
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68 #endif
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69 if(fn_ptn == NULL)
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70 goto err;
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71
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72 FcPatternDestroy(ptn);
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73 FcPatternDestroy(p);
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74
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75 return fn_ptn;
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76
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77 err:
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78 if(ptn)
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79 FcPatternDestroy(ptn);
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80 if(p)
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81 FcPatternDestroy(p);
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82 return NULL;
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83
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84 }
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85
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86 /*! \brief Find out a font face for a pattern specified.
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Thinker K.F. Li <thinker@branda.to>
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87 *
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88 * The pattern, here, is a vector of family, slant, and weight.
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89 * This function base on fontconfig and cairo FreeType font supporting.
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90 * You can replace this function with other font mechanisms.
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91 */
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92 mbe_font_face_t *
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93 mbe_query_font_face(const char *family, int slant, int weight) {
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94 mbe_font_face_t *cface;
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95 FcPattern *ptn;
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96
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97 ptn = query_font_pattern(family, slant, weight);
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98 cface = mbe_ft_font_face_create_for_pattern(ptn);
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99 FcPatternDestroy(ptn);
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100
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101 return cface;
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102 }
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103
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104 void
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105 mbe_free_font_face(mbe_font_face_t *face) {
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106 ASSERT(face == NULL);
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107
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108 mbe_font_face_destroy(face);
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109 }
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110