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Lines 147-153
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| 147 |
/* This list shall be expanded as we find more of them. */ |
147 |
/* This list shall be expanded as we find more of them. */ |
| 148 |
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148 |
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| 149 |
static FT_Bool |
149 |
static FT_Bool |
| 150 |
tt_check_trickyness( FT_String* name ) |
150 |
tt_check_trickyness_family( FT_String* name ) |
| 151 |
{ |
151 |
{ |
| 152 |
#define TRICK_NAMES_MAX_CHARACTERS 16 |
152 |
#define TRICK_NAMES_MAX_CHARACTERS 16 |
| 153 |
#define TRICK_NAMES_COUNT 8 |
153 |
#define TRICK_NAMES_COUNT 8 |
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Lines 163-178
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| 163 |
"MingLi43", /* mingli.ttf */ |
163 |
"MingLi43", /* mingli.ttf */ |
| 164 |
}; |
164 |
}; |
| 165 |
int nn; |
165 |
int nn; |
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166 |
for ( nn = 0; nn < TRICK_NAMES_COUNT; nn++ ) |
| 167 |
if ( ft_strstr( name, trick_names[nn] ) ) |
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return TRUE; |
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169 |
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170 |
return FALSE; |
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} |
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172 |
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| 168 |
if ( !name ) |
173 |
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| 169 |
return TRUE; |
174 |
/* XXX: this function should be in sfnt module */ |
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175 |
/* some PDF generators clear the checksum in TrueType header */ |
| 176 |
/* (Quartz ContextPDF clears all, Bullzip PDF Printer clears */ |
| 177 |
/* for the subsetted subtables), we have to recalculate when */ |
| 178 |
/* it is cleared. */ |
| 179 |
static FT_UInt32 |
| 180 |
tt_synth_sfnt_checksum( FT_Stream stream, |
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FT_ULong length ) |
| 182 |
{ |
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FT_Error error; |
| 184 |
FT_UInt32 checksum = 0; |
| 185 |
int i; |
| 186 |
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| 187 |
|
| 188 |
if ( FT_FRAME_ENTER( length ) ) |
| 189 |
return 0; |
| 190 |
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| 191 |
for ( ; length > 3; length -= 4 ) |
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checksum += (FT_UInt32)FT_GET_ULONG(); |
| 193 |
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| 194 |
for ( i = 3; length > 0; length --, i-- ) |
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checksum += (FT_UInt32)( FT_GET_BYTE() << ( i * 8 ) ); |
| 196 |
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| 197 |
FT_FRAME_EXIT(); |
| 198 |
|
| 199 |
return checksum; |
| 200 |
} |
| 201 |
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| 202 |
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| 203 |
/* XXX: this function should be in sfnt module */ |
| 204 |
static FT_ULong |
| 205 |
tt_get_sfnt_checksum( TT_Face face, |
| 206 |
FT_UShort i ) |
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{ |
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if ( face->dir_tables[i].CheckSum ) |
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return face->dir_tables[i].CheckSum; |
| 210 |
else if ( !face->goto_table ) |
| 211 |
return 0; |
| 212 |
else if ( !face->goto_table( face, |
| 213 |
face->dir_tables[i].Tag, |
| 214 |
face->root.stream, |
| 215 |
NULL ) ) |
| 216 |
return 0; |
| 217 |
|
| 218 |
return (FT_ULong)tt_synth_sfnt_checksum( face->root.stream, |
| 219 |
face->dir_tables[i].Length ); |
| 220 |
} |
| 221 |
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| 222 |
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| 223 |
typedef struct tt_sfnt_id_rec_ |
| 224 |
{ |
| 225 |
FT_ULong CheckSum; |
| 226 |
FT_ULong Length; |
| 227 |
} tt_sfnt_id_rec; |
| 228 |
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| 229 |
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| 230 |
static FT_Bool |
| 231 |
tt_check_trickyness_sfnt_ids( TT_Face face ) |
| 232 |
{ |
| 233 |
#define TRICK_SFNT_IDS_PER_FACE 3 |
| 234 |
#define TRICK_SFNT_IDS_NUM_FACES 5 |
| 235 |
static const tt_sfnt_id_rec sfnt_id[TRICK_SFNT_IDS_NUM_FACES] |
| 236 |
[TRICK_SFNT_IDS_PER_FACE] = { |
| 237 |
#define TRICK_SFNT_ID_cvt 0 |
| 238 |
#define TRICK_SFNT_ID_fpgm 1 |
| 239 |
#define TRICK_SFNT_ID_prep 2 |
| 240 |
{ /* MingLiU 1995 */ |
| 241 |
{ 0x05bcf058, 0x000002e4 }, /* cvt */ |
| 242 |
{ 0x28233bf1, 0x000087c4 }, /* fpgm */ |
| 243 |
{ 0xa344a1ea, 0x000001e1 } /* prep */ |
| 244 |
}, |
| 245 |
{ /* MingLiU 1996- */ |
| 246 |
{ 0x05bcf058, 0x000002e4 }, /* cvt */ |
| 247 |
{ 0x28233bf1, 0x000087c4 }, /* fpgm */ |
| 248 |
{ 0xa344a1eb, 0x000001e1 } /* prep */ |
| 249 |
}, |
| 250 |
{ /* DFKaiShu */ |
| 251 |
{ 0x11e5ead4, 0x00000350 }, /* cvt */ |
| 252 |
{ 0x5a30ca3b, 0x00009063 }, /* fpgm */ |
| 253 |
{ 0x13a42602, 0x0000007e } /* prep */ |
| 254 |
}, |
| 255 |
{ /* HuaTianKaiTi */ |
| 256 |
{ 0xfffbfffc, 0x00000008 }, /* cvt */ |
| 257 |
{ 0x9c9e48b8, 0x0000bea2 }, /* fpgm */ |
| 258 |
{ 0x70020112, 0x00000008 } /* prep */ |
| 259 |
}, |
| 260 |
{ /* HuaTianSongTi */ |
| 261 |
{ 0xfffbfffc, 0x00000008 }, /* cvt */ |
| 262 |
{ 0x0a5a0483, 0x00017c39 }, /* fpgm */ |
| 263 |
{ 0x70020112, 0x00000008 } /* prep */ |
| 264 |
} |
| 265 |
}; |
| 266 |
FT_ULong checksum; |
| 267 |
int num_matched_ids[TRICK_SFNT_IDS_NUM_FACES]; |
| 268 |
int i, j, k; |
| 269 |
|
| 270 |
FT_MEM_SET( num_matched_ids, 0, sizeof( int ) * TRICK_SFNT_IDS_NUM_FACES ); |
| 271 |
|
| 272 |
for ( i = 0; i < face->num_tables; i++ ) |
| 273 |
{ |
| 274 |
checksum = 0; |
| 275 |
switch( face->dir_tables[i].Tag ) |
| 276 |
{ |
| 277 |
case TTAG_cvt: |
| 278 |
k = TRICK_SFNT_ID_cvt; |
| 279 |
break; |
| 280 |
case TTAG_fpgm: |
| 281 |
k = TRICK_SFNT_ID_fpgm; |
| 282 |
break; |
| 283 |
case TTAG_prep: |
| 284 |
k = TRICK_SFNT_ID_prep; |
| 285 |
break; |
| 286 |
default: |
| 287 |
continue; |
| 288 |
} |
| 289 |
for ( j = 0; j < TRICK_SFNT_IDS_NUM_FACES; j++ ) |
| 290 |
if ( face->dir_tables[i].Length == sfnt_id[j][k].Length ) |
| 291 |
{ |
| 292 |
if ( !checksum ) |
| 293 |
checksum = tt_get_sfnt_checksum( face, i ); |
| 294 |
if ( sfnt_id[j][k].CheckSum == checksum ) |
| 295 |
num_matched_ids[j] ++; |
| 296 |
if ( num_matched_ids[j] == TRICK_SFNT_IDS_PER_FACE ) |
| 297 |
return TRUE; |
| 298 |
} |
| 299 |
} |
| 300 |
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| 301 |
return FALSE; |
| 302 |
} |
| 303 |
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| 304 |
|
| 305 |
static FT_Bool |
| 306 |
tt_check_trickyness( FT_Face face ) |
| 307 |
{ |
| 308 |
if ( !face ) |
| 309 |
return FALSE; |
| 170 |
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310 |
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| 171 |
/* Note that we only check the face name at the moment; it might */ |
311 |
/* Note that we only check the face name at the moment; it might */ |
| 172 |
/* be worth to do more checks for a few special cases. */ |
312 |
/* be worth to do more checks for a few special cases. */ |
| 173 |
for ( nn = 0; nn < TRICK_NAMES_COUNT; nn++ ) |
313 |
if ( face->family_name ) |
| 174 |
if ( ft_strstr( name, trick_names[nn] ) ) |
314 |
{ |
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315 |
if ( tt_check_trickyness_family( face->family_name ) ) |
| 175 |
return TRUE; |
316 |
return TRUE; |
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317 |
else |
| 318 |
return FALSE; |
| 319 |
} |
| 320 |
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| 321 |
/* Type42 may lack `name' tables, try to identfiy tricky fonts by */ |
| 322 |
/* the checksums of Type42-persistent sfnt tables; cvt, fpgm, prep */ |
| 323 |
if ( tt_check_trickyness_sfnt_ids( ( TT_Face )face ) ) |
| 324 |
return TRUE; |
| 176 |
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325 |
|
| 177 |
return FALSE; |
326 |
return FALSE; |
| 178 |
} |
327 |
} |
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Lines 252-258
Link Here
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| 252 |
if ( error ) |
401 |
if ( error ) |
| 253 |
goto Exit; |
402 |
goto Exit; |
| 254 |
|
403 |
|
| 255 |
if ( tt_check_trickyness( ttface->family_name ) ) |
404 |
if ( tt_check_trickyness( ttface ) ) |
| 256 |
ttface->face_flags |= FT_FACE_FLAG_TRICKY; |
405 |
ttface->face_flags |= FT_FACE_FLAG_TRICKY; |
| 257 |
|
406 |
|
| 258 |
error = tt_face_load_hdmx( face, stream ); |
407 |
error = tt_face_load_hdmx( face, stream ); |
