Mercurial > MadButterfly
annotate src/shape_stext.c @ 395:d30b575a4ad4
Add fontconfig layer
author | Thinker K.F. Li <thinker@branda.to> |
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date | Wed, 10 Jun 2009 21:45:39 +0800 |
parents | b3d5ce48670a |
children | 7fe0b1ee92b6 |
rev | line source |
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394
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1 #if 0 |
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2 |
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3 #include <stdio.h> |
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4 #include <cairo.h> |
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5 #include <cairo-ft.h> |
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6 #include <fontconfig/fontconfig.h> |
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7 #include "mb_shapes.h" |
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8 |
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9 #ifndef ASSERT |
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10 #define ASSERT(x) |
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11 #endif |
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12 #define OK 0 |
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13 #define ERR -1 |
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14 |
395 | 15 /*! \brief Find out a font pattern. |
16 * | |
17 * This function use fontconfig to decide a font file in pattern. It can | |
18 * replaced by other mechanism if you think it is not what you want. | |
19 */ | |
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20 static |
395 | 21 FcPattern *query_font_pattern(const char *family, int slant, int weight) { |
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22 FcPattern *ptn, *p; |
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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 static int slant_map[] = { /* from MB_FONT_SLANT_* to FC_SLANT_* */ |
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27 FC_SLANT_ROMAN, |
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28 FC_SLANT_ROMAN, |
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29 FC_SLANT_ITALIC, |
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30 FC_SLANT_OBLIQUE}; |
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31 |
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32 cfg = FcConfigGetCurrent(); |
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33 ptn = FcPatternCreate(); |
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34 p = FcPatternCreate(); |
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35 if(ptn == NULL || p == NULL) |
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36 goto err; |
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37 |
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38 val.type = FcTypeString; |
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39 val.u.s = family; |
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40 FcPatternAdd(ptn, "family", &val, FcTrue); |
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41 |
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42 val.type = FcTypeInteger; |
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43 val.u.i = slant_map[slant]; |
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44 FcPatternAdd(ptn, "slant", &val, FcTrue); |
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45 |
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46 val.type = FcTypeInteger; |
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47 val.u.i = weight; |
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48 FcPatternAdd(ptn, "weight", &val, FcTrue); |
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49 |
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50 r = FcConfigSubstituteWithPat(cfg, ptn, NULL, FcMatchPattern); |
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51 if(!r) |
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52 goto err; |
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53 |
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54 r = FcConfigSubstituteWithPat(cfg, p, ptn, FcMatchFont); |
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55 if(!r) |
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56 goto err; |
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57 |
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58 FcDefaultSubstitute(p); |
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59 |
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60 FcPatternDestroy(ptn); |
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61 |
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62 return p; |
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63 |
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64 err: |
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65 if(ptn) |
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66 FcPatternDestroy(ptn); |
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67 if(p) |
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68 FcPatternDestroy(p); |
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69 return NULL; |
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70 |
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71 } |
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72 |
395 | 73 /*! \brief Find out a font face for a pattern specified. |
74 * | |
75 * The pattern, here, is a vector of family, slant, and weight. | |
76 * This function base on fontconfig and cairo FreeType font supporting. | |
77 * You can replace this function with other font mechanisms. | |
78 */ | |
79 static | |
80 cairo_font_face_t *query_font_face(const char *family, | |
81 int slant, | |
82 int weight) { | |
83 cairo_font_face_t *cface; | |
84 FcPattern *ptn; | |
85 | |
86 ptn = query_font_pattern(family, slant, weight); | |
87 cface = cairo_ft_font_face_create_for_pattern(ptn); | |
88 FcPatternDestroy(ptn); | |
89 | |
90 return cface; | |
91 } | |
92 | |
93 static | |
94 void free_font_face(cairo_font_face_t *cface) { | |
95 ASSERT(cface == NULL); | |
96 | |
97 cairo_font_face_destroy(cface); | |
98 } | |
99 | |
100 /*! \brief This is scaled font for specified size and extent. | |
101 * | |
102 * Font face only specified which font would be used to draw text | |
103 * message. But, it also need to scale glyphs to specified size and | |
104 * rotation. This function return a scaled font specified by a | |
105 * matrix that transform glyph from design space of the font to | |
106 * user space of cairo surface. | |
107 */ | |
108 static | |
109 cairo_scaled_font_t *get_ciaro_scaled_font(cairo_font_face_t *cface, | |
110 co_aix *matrix) { | |
111 cairo_font_face_t *scaled_font; | |
112 cairo_matrix_t font_matrix; | |
113 static cairo_matir_t id = { | |
114 1, 0, | |
115 0, 1, | |
116 0, 0 | |
117 }; | |
118 static cairo_font_options_t *opt = NULL; | |
119 | |
120 ASSERT(matrix != NULL); | |
121 | |
122 if(opt == NULL) { | |
123 opt = cairo_font_options_create(); | |
124 if(opt == NULL) | |
125 return NULL; | |
126 } | |
127 | |
128 font_matrix.xx = *matrix++; | |
129 font_matrix.xy = *matrix++; | |
130 font_matrix.x0 = *matrix++; | |
131 font_matrix.yx = *matrix++; | |
132 font_matrix.yy = *matrix++; | |
133 font_matrix.y0 = *matrix; | |
134 scaled_font = cairo_scaled_font_create(cface, &font_matrix, | |
135 &id, opt); | |
136 | |
137 return scaled_font; | |
138 } | |
139 | |
140 static | |
141 void free_scaled_font(cairo_scaled_font_t *scaled_font) { | |
142 cairo_scaled_font_destroy(scaled_font); | |
143 } | |
144 | |
145 /* ============================================================ */ | |
146 | |
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147 /*! \brief Query and return a font face for a specified attribute vector. |
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148 * |
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149 * Programmers use mb_font_face_t to specify fonts used to show a |
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150 * block of text on the output device. They can get mb_font_face_t with |
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151 * this function. The objects return by mb_font_face_query() should be |
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152 * freed with mb_font_face_free() when they are not more used. |
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153 * |
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154 * \param family is the name of a font family (times). |
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155 * \param slant is one of \ref MB_FONT_SLANTS. |
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156 * \param weight decides if a font is thin or heavy. |
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157 */ |
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158 mb_font_face_t *mb_font_face_query(redraw_man_t *rdman, |
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159 const char *family, |
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160 int slant, |
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161 int weight) { |
395 | 162 return (mb_font_face_t *)query_font_face(family, slant, weight); |
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163 } |
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164 |
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165 void mb_font_face_free(mb_font_face_t *face) { |
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166 cairo_font_face_t *cface = (cairo_font_face_t *)face; |
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167 ASSERT(face != NULL); |
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168 cairo_font_face_destroy(face); |
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169 } |
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170 |
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171 /*! \brief A simple implementation of text shape. |
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172 * |
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173 */ |
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174 typedef struct _sh_stext { |
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175 shape_t shape; |
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176 const char *txt; /*!< \brief Text to be showed */ |
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177 const mb_style_blk_t *style_blks; /*!< \brief Style of text */ |
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178 int nblks; /*!< \brief Number of style blocks */ |
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179 int max_nblks; |
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180 co_aix x, y; |
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181 cairo_scaled_font_t **scaled_fonts; |
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182 } sh_stext_t; |
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183 |
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184 shape_t *rdman_shape_stext_new(redraw_man_t *rdman, co_aix x, co_aix y, |
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185 const char *txt) { |
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186 sh_stext_t *txt_o; |
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187 |
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188 ASSERT(txt != NULL); |
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189 |
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190 txt_o = (sh_stext_t *)malloc(sizeof(sh_stext_t)); |
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191 if(txt_o == NULL) |
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192 return NULL; |
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193 |
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194 memset(&txt_o->shape, 0, sizeof(shape_t)); |
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195 mb_obj_init(txt_o, MBO_STEXT); |
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196 |
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197 txt_o->txt = strdup(txt); |
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198 txt_o->style_blks = NULL; |
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199 txt_o->nblks = 0; |
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200 txt_o->max_nblks = 0; |
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201 txt_o->x = x; |
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202 txt_o->y = y; |
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203 txt_o->exts = NULL; |
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204 |
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205 if(txt_o->txt == NULL) { |
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206 free(txt_o); |
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207 txt_o = NULL; |
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208 } |
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209 |
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210 return (shape_t *)txt_o; |
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211 } |
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212 |
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213 static |
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214 int compute_utf8_chars_sz(const char *txt, int n_chars) { |
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215 int i; |
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216 const char *p = txt; |
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217 |
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218 for(i = 0; i < n && *p; i++) { |
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219 if(*p++ & 0x80) |
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220 continue; /* single byte */ |
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221 /* multi-bytes */ |
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222 while(*p && ((*p & 0xc0) == 0x80)) |
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223 p++; |
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224 } |
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225 if(i < n) |
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226 return ERR; |
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227 |
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228 return p - txt; |
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229 } |
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230 |
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231 static |
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232 void compute_text_extents(char *txt, int txt_len, |
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233 cairo_scaled_font_t *scaled_font, |
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234 cairo_text_extents_t *extents) { |
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235 char saved; |
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236 |
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237 saved = txt[txt_len]; |
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238 txt[txt_len] = 0; |
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239 cairo_scaled_font_text_extents(scaled_font, txt, extents); |
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240 txt[txt_len] = saved; |
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241 } |
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242 |
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243 static |
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244 cairo_scaled_font_t *make_scaled_font_face(sh_stext_t *txt_o, |
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245 cairo_font_face_t *face, |
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246 co_aix shift_x, co_aix shift_y, |
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247 co_aix font_sz) { |
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248 cairo_matrix_t cmtx; |
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249 static cairo_matrix_t cid; |
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250 static cairo_font_options_t *fopt = NULL; |
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251 co_aix *matrix; |
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252 cairo_scaled_font_t *scaled; |
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253 int i; |
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254 |
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255 if(fopt == NULL) { |
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256 cairo_matrix_init_identify(&cid); |
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257 fopt = cairo_font_options_create(); |
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258 if(fopt == NULL) |
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259 return NULL; |
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260 } |
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261 |
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262 matrix = sh_get_aggr_matrix((shape_t *)txt_o); |
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263 i = 0; |
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264 cmtx.xx = matrix[i++]; |
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265 cmtx.xy = matrix[i++]; |
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266 cmtx.x0 = matrix[i++] + shift_x; |
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267 cmtx.yx = matrix[i++]; |
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268 cmtx.yy = matrix[i++]; |
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269 cmtx.y0 = matrix[i] + shift_y; |
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270 |
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271 scaled = cairo_scaled_font_create(face, &cmtx, &cid, fopt); |
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272 |
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273 return scaled; |
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274 } |
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275 |
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276 static |
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277 void compute_extents(sh_stext_t *txt_o) { |
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278 co_aix adv_x, adv_y; |
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279 cairo_text_extents_t extents; |
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280 mb_style_blk_t *blk; |
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281 cairo_scaled_font_t *scaled_font; |
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282 char *txt; |
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283 co_aix shift_x, shift_y; |
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284 int blk_txt_len; |
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285 int i; |
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286 |
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287 adv_x = adv_y = 0; |
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288 blk = txt_o->style_blks; |
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289 scaled_font = txt_o->scaled_fonts; |
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290 txt = (char *)txt_o->txt; |
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291 shift_x = txt_o->x; |
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292 shift_y = txt_o->y; |
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293 for(i = 0; i < txt_o->nblks; i++) { |
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294 *scaled_font = make_scaled_fonts(txt_o, blk->face, |
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295 shift_x, shift_y, font_sz); |
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296 ASSERT(*scaled_font != NULL); |
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297 |
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298 blk_txt_len = compute_utf8_chars_sz(txt, blk->n_chars); |
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299 ASSERT(blk_txt_len != ERR); |
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300 |
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301 compute_text_extents(txt, blk_txt_len, *scaled_font, &extents); |
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302 adv_x += extents.x_advance; |
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303 adv_y += extents.y_advance; |
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304 |
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305 scaled_font++; |
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306 blk++; |
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307 txt += blk_txt_len; |
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308 } |
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309 } |
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310 |
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311 /* |
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312 * What we have to do in sh_stext_transform() is |
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313 * - computing bounding box for the text, |
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314 * - computing offset x,y for the text of style blocks, |
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315 * - free old scaled fonts, and |
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316 * - making scaled fonts for style blocks. |
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317 */ |
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318 void sh_stext_transform(shape_t *shape) { |
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319 sh_stext_t *txt_o = (sh_stext_t *)shape; |
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320 |
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321 ASSERT(txt_o != NULL); |
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322 } |
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323 |
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324 void sh_stext_draw(shape_t *shape, cairo_t *cr) { |
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325 sh_stext_t *txt_o = (sh_stext_t *)shape; |
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326 |
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327 ASSERT(txt_o != NULL); |
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328 } |
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329 |
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330 int sh_stext_set_text(shape_t *shape, const char *txt) { |
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331 sh_stext_t *txt_o = (sh_stext_t *)shape; |
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332 char *new_txt; |
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333 int sz; |
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334 |
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335 ASSERT(txt_o != NULL); |
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336 ASSERT(txt != NULL); |
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337 |
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338 sz = strlen(txt) + 1; |
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339 new_txt = realloc(txt_o->txt, sz); |
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340 if(new_txt == NULL) |
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341 return ERR; |
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342 |
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343 memcpy(new_txt, txt, sz); |
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344 txt_o->txt = new_txt; |
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345 |
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346 return OK; |
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347 } |
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348 |
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349 int sh_stext_set_style(shape_t *shape, |
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350 const mb_style_blk_t *blks, |
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351 int nblks) { |
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352 sh_stext_t *txt_o = (sh_stext_t *)shape; |
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353 mb_style_blk_t *new_blks; |
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354 co_aix *new_exts; |
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355 int sz; |
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356 |
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357 ASSERT(txt_o != NULL); |
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358 ASSERT(nblks >= 0); |
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359 |
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360 if(nblks > txt_o->max_nblks) { |
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361 sz = nblks * (sizeof(mb_style_blk_t) + sizeof(int)); |
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362 new_blks = (mb_style_blk_t *)realloc(txt_o->style_blks, sz); |
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363 if(new_blks == NULL) |
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364 return ERR; |
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365 new_exts = (int *)(new_blks + nblks); |
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366 |
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367 txt_o->style_blks = new_blks; |
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368 txt_o->exts = new_exts; |
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369 txt_o->max_nblks = nblks; |
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370 } |
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371 |
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372 memcpy(txt_o->blks, blks, nblks * sizeof(mb_style_blk_t)); |
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373 txt_o->nblks = nblks; |
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374 |
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375 return OK; |
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376 } |
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377 |
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378 #endif /* 0 */ |