Mercurial > MadButterfly

annotate src/shape_text.c @ 148:fce696643b1e

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author Thinker K.F. Li <thinker@branda.to>
date Thu, 25 Sep 2008 10:14:19 +0800
parents 98c83441d7d6
children b90abd31a281
rev   line source
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Thinker K.F. Li <thinker@branda.to>
parents:
diff changeset
1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <string.h>
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4 #include <math.h>
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5 #include <cairo.h>
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6 #include "mb_types.h"
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7 #include "shapes.h"
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8
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9 #define ASSERT(x)
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10 #define OK 0
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11 #define ERR -1
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12
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13 typedef struct _sh_text {
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14 shape_t shape;
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15 char *data;
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16 co_aix x, y;
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17 co_aix d_x, d_y; /* device x and y */
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18 co_aix font_size;
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19 co_aix d_font_size;
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20 cairo_font_face_t *face;
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21 cairo_scaled_font_t *scaled_font;
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22 int flags;
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23 } sh_text_t;
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24
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25 #define TXF_SCALE_DIRTY 0x1
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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 *sh_text_new(const char *txt, co_aix x, co_aix y,
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36 co_aix font_size, cairo_font_face_t *face) {
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37 sh_text_t *text;
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38
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39 text = (sh_text_t *)malloc(sizeof(sh_text_t));
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40 if(text == NULL)
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41 return NULL;
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42
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43 memset(text, 0, sizeof(sh_text_t));
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44 text->shape.sh_type = SHT_TEXT;
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45 text->data = strdup(txt);
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46 if(text->data == NULL) {
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47 free(text);
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48 return NULL;
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49 }
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50 text->x = x;
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51 text->y = y;
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52 text->font_size = font_size;
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53 cairo_font_face_reference(face);
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54 text->face = face;
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55 text->flags |= TXF_SCALE_DIRTY;
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56
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57 text->shape.free = sh_text_free;
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58
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59 return (shape_t *)text;
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60 }
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61
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62 extern void sh_text_set_text(shape_t *shape, const char *txt) {
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63 sh_text_t *text = (sh_text_t *)shape;
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64 char *buf;
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65
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66 buf = strdup(txt);
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67 if(text->data) free(text->data);
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68 text->data = buf;
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69 }
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70
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71 static int get_extents(sh_text_t *text, cairo_text_extents_t *extents) {
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72 cairo_matrix_t fmatrix;
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73 cairo_matrix_t ctm;
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74 cairo_scaled_font_t *new_scaled;
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75 cairo_font_options_t *fopt;
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76
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77 if((text->flags & TXF_SCALE_DIRTY) ||
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78 text->scaled_font == NULL) {
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79 fopt = cairo_font_options_create();
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80 if(fopt == NULL)
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81 return ERR;
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82 memset(&fmatrix, 0, sizeof(cairo_matrix_t));
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83 fmatrix.xx = text->d_font_size;
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84 fmatrix.yy = text->d_font_size;
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85 memset(&ctm, 0, sizeof(cairo_matrix_t));
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86 ctm.xx = 1;
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87 ctm.yy = 1;
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88 new_scaled = cairo_scaled_font_create(text->face,
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89 &fmatrix,
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90 &ctm,
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91 fopt);
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92 cairo_font_options_destroy(fopt);
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93 if(new_scaled == NULL)
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94 return ERR;
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95
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96 if(text->scaled_font)
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97 cairo_scaled_font_destroy(text->scaled_font);
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98 text->scaled_font = new_scaled;
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99 text->flags &= ~TXF_SCALE_DIRTY;
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100 }
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101
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102 cairo_scaled_font_text_extents(text->scaled_font,
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103 text->data, extents);
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104 return OK;
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105 }
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106
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107 void sh_text_transform(shape_t *shape) {
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108 sh_text_t *text;
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109 co_aix x, y;
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110 co_aix shw;
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111 cairo_text_extents_t extents;
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112 co_aix poses[2][2];
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113 int r;
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114
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115 text = (sh_text_t *)shape;
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116
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117 text->d_font_size = coord_trans_size(shape->coord, text->font_size);
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118
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119 x = text->x;
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120 y = text->y;
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121 coord_trans_pos(shape->coord, &x, &y);
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122 r = get_extents(text, &extents);
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123 ASSERT(r == OK);
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124
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125 text->d_x = x;
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126 text->d_y = y;
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127 shw = shape->stroke_width / 2;
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128 /* FIXME: It is unreasonable that a font exceed it's bbox.
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129 * We add 5 pixels in get right bbox. But, it is unreasonable.
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130 */
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131 poses[0][0] = x + extents.x_bearing - 5 - shw;
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132 poses[0][1] = y + extents.y_bearing - 5 - shw;
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133 poses[1][0] = poses[0][0] + extents.width + 10 + shape->stroke_width;
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134 poses[1][1] = poses[0][1] + extents.height + 10 + shape->stroke_width;
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135 geo_from_positions(shape->geo, 2, poses);
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136 /*! \todo Support ratation for shape_text. */
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137 }
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138
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139
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140 static void draw_text(sh_text_t *text, cairo_t *cr) {
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141 cairo_set_scaled_font(cr, text->scaled_font);
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142 cairo_move_to(cr, text->d_x, text->d_y);
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143 cairo_text_path(cr, text->data);
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144 }
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145
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146
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147 void sh_text_draw(shape_t *shape, cairo_t *cr) {
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148 draw_text((sh_text_t *)shape, cr);
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149 }
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150