Mercurial > MadButterfly
annotate src/shape_text.c @ 213:a0a3196b1a05
Refactory pointer computation into a macro.
- It is hard to read a complicate pointer calculation. A macro can make
it more easy to be read.
| author | Thinker K.F. Li <thinker@branda.to> |
|---|---|
| date | Fri, 12 Dec 2008 09:35:27 +0800 |
| parents | c234ee745ceb |
| children | 29e1b2bffe4c |
| rev | line source |
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| 27 | 1 #include <stdio.h> |
| 2 #include <stdlib.h> | |
| 3 #include <string.h> | |
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4 #include <math.h> |
| 27 | 5 #include <cairo.h> |
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6 #include "mb_types.h" |
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7 #include "mb_shapes.h" |
| 27 | 8 |
| 104 | 9 #define ASSERT(x) |
| 27 | 10 #define OK 0 |
| 11 #define ERR -1 | |
| 12 | |
| 13 typedef struct _sh_text { | |
| 14 shape_t shape; | |
| 15 char *data; | |
| 16 co_aix x, y; | |
| 17 co_aix d_x, d_y; /* device x and y */ | |
| 18 co_aix font_size; | |
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19 co_aix d_font_size; |
| 27 | 20 cairo_font_face_t *face; |
| 21 cairo_scaled_font_t *scaled_font; | |
| 22 int flags; | |
| 23 } sh_text_t; | |
| 24 | |
| 25 #define TXF_SCALE_DIRTY 0x1 | |
| 26 | |
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27 static void sh_text_free(shape_t *shape) { |
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28 sh_text_t *text = (sh_text_t *)shape; |
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29 |
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30 if(text->scaled_font) |
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31 cairo_scaled_font_destroy(text->scaled_font); |
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32 cairo_font_face_destroy(text->face); |
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33 } |
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34 |
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35 shape_t *rdman_shape_text_new(redraw_man_t *rdman, |
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36 const char *txt, co_aix x, co_aix y, |
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37 co_aix font_size, cairo_font_face_t *face) { |
| 27 | 38 sh_text_t *text; |
| 39 | |
| 40 text = (sh_text_t *)malloc(sizeof(sh_text_t)); | |
| 41 if(text == NULL) | |
| 42 return NULL; | |
| 43 | |
| 44 memset(text, 0, sizeof(sh_text_t)); | |
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45 MBO_TYPE(text) = MBO_TEXT; |
| 27 | 46 text->data = strdup(txt); |
| 47 if(text->data == NULL) { | |
| 48 free(text); | |
| 49 return NULL; | |
| 50 } | |
| 51 text->x = x; | |
| 52 text->y = y; | |
| 53 text->font_size = font_size; | |
| 54 cairo_font_face_reference(face); | |
| 55 text->face = face; | |
| 56 text->flags |= TXF_SCALE_DIRTY; | |
| 57 | |
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58 text->shape.free = sh_text_free; |
| 27 | 59 |
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60 rdman_shape_man(rdman, (shape_t *)text); |
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61 |
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62 return (shape_t *)text; |
| 27 | 63 } |
| 64 | |
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65 extern void sh_text_set_text(shape_t *shape, const char *txt) { |
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66 sh_text_t *text = (sh_text_t *)shape; |
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67 char *buf; |
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68 |
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69 buf = strdup(txt); |
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70 if(text->data) free(text->data); |
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71 text->data = buf; |
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72 } |
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| 27 | 74 static int get_extents(sh_text_t *text, cairo_text_extents_t *extents) { |
| 75 cairo_matrix_t fmatrix; | |
| 76 cairo_matrix_t ctm; | |
| 77 cairo_scaled_font_t *new_scaled; | |
| 78 cairo_font_options_t *fopt; | |
| 79 | |
| 80 if((text->flags & TXF_SCALE_DIRTY) || | |
| 81 text->scaled_font == NULL) { | |
| 82 fopt = cairo_font_options_create(); | |
| 83 if(fopt == NULL) | |
| 84 return ERR; | |
| 85 memset(&fmatrix, 0, sizeof(cairo_matrix_t)); | |
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86 fmatrix.xx = text->d_font_size; |
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87 fmatrix.yy = text->d_font_size; |
| 27 | 88 memset(&ctm, 0, sizeof(cairo_matrix_t)); |
| 89 ctm.xx = 1; | |
| 90 ctm.yy = 1; | |
| 91 new_scaled = cairo_scaled_font_create(text->face, | |
| 92 &fmatrix, | |
| 93 &ctm, | |
| 94 fopt); | |
| 95 cairo_font_options_destroy(fopt); | |
| 96 if(new_scaled == NULL) | |
| 97 return ERR; | |
| 98 | |
| 99 if(text->scaled_font) | |
| 100 cairo_scaled_font_destroy(text->scaled_font); | |
| 101 text->scaled_font = new_scaled; | |
| 102 text->flags &= ~TXF_SCALE_DIRTY; | |
| 103 } | |
| 104 | |
| 105 cairo_scaled_font_text_extents(text->scaled_font, | |
| 106 text->data, extents); | |
| 107 return OK; | |
| 108 } | |
| 109 | |
| 110 void sh_text_transform(shape_t *shape) { | |
| 111 sh_text_t *text; | |
| 112 co_aix x, y; | |
| 113 co_aix shw; | |
| 114 cairo_text_extents_t extents; | |
| 115 co_aix poses[2][2]; | |
| 116 int r; | |
| 117 | |
| 118 text = (sh_text_t *)shape; | |
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119 |
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120 text->d_font_size = coord_trans_size(shape->coord, text->font_size); |
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121 |
| 27 | 122 x = text->x; |
| 123 y = text->y; | |
| 124 coord_trans_pos(shape->coord, &x, &y); | |
| 125 r = get_extents(text, &extents); | |
| 104 | 126 ASSERT(r == OK); |
| 27 | 127 |
| 128 text->d_x = x; | |
| 129 text->d_y = y; | |
| 130 shw = shape->stroke_width / 2; | |
| 131 /* FIXME: It is unreasonable that a font exceed it's bbox. | |
| 132 * We add 5 pixels in get right bbox. But, it is unreasonable. | |
| 133 */ | |
| 134 poses[0][0] = x + extents.x_bearing - 5 - shw; | |
| 135 poses[0][1] = y + extents.y_bearing - 5 - shw; | |
| 136 poses[1][0] = poses[0][0] + extents.width + 10 + shape->stroke_width; | |
| 137 poses[1][1] = poses[0][1] + extents.height + 10 + shape->stroke_width; | |
| 138 geo_from_positions(shape->geo, 2, poses); | |
| 104 | 139 /*! \todo Support ratation for shape_text. */ |
| 27 | 140 } |
| 141 | |
| 142 | |
| 143 static void draw_text(sh_text_t *text, cairo_t *cr) { | |
| 144 cairo_set_scaled_font(cr, text->scaled_font); | |
| 145 cairo_move_to(cr, text->d_x, text->d_y); | |
| 146 cairo_text_path(cr, text->data); | |
| 147 } | |
| 148 | |
| 149 | |
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150 void sh_text_draw(shape_t *shape, cairo_t *cr) { |
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151 draw_text((sh_text_t *)shape, cr); |
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152 } |
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153 |