| #include "afglobal.h" |
| #include "afdummy.h" |
| #include "aflatin.h" |
| |
| /* populate this list when you add new scripts |
| */ |
| static AF_ScriptClass const af_script_classes[] = |
| { |
| & af_dummy_script_class, |
| & af_latin_script_class, |
| |
| NULL /* do not remove */ |
| }; |
| |
| #define AF_SCRIPT_LIST_DEFAULT 0 /* index of default script in 'af_script_classes' */ |
| #define AF_SCRIPT_LIST_NONE 255 /* indicates an uncovered glyph */ |
| |
| /* |
| * note that glyph_scripts[] is used to map each glyph into |
| * an index into the 'af_script_classes' array. |
| * |
| */ |
| typedef struct AF_FaceGlobalsRec_ |
| { |
| FT_Face face; |
| FT_UInt glyph_count; /* same as face->num_glyphs */ |
| FT_Byte* glyph_scripts; |
| |
| AF_ScriptMetrics metrics[ AF_SCRIPT_MAX ]; |
| |
| } AF_FaceGlobalsRec; |
| |
| |
| |
| |
| /* this function is used to compute the script index of each glyph |
| * within a given face |
| */ |
| static FT_Error |
| af_face_globals_compute_script_coverage( AF_FaceGlobals globals ) |
| { |
| FT_Error error = 0; |
| FT_Face face = globals->face; |
| FT_CharMap old_charmap = face->charmap; |
| FT_Byte* gscripts = globals->glyph_scripts; |
| FT_UInt ss; |
| |
| /* the value 255 means "uncovered glyph" |
| */ |
| FT_MEM_SET( globals->glyph_scripts, |
| AF_SCRIPT_LIST_NONE, |
| globals->glyph_count ); |
| |
| error = FT_Select_Charmap( face, FT_ENCODING_UNICODE ); |
| if ( error ) |
| { |
| /* ignore this error, we'll simply use Latin as the standard |
| * script. XXX: Shouldn't we rather disable hinting ?? |
| */ |
| error = 0; |
| goto Exit; |
| } |
| |
| /* scan each script in a Unicode charmap |
| */ |
| for ( ss = 0; af_script_classes[ss]; ss++ ) |
| { |
| AF_ScriptClass clazz = af_script_classes[ss]; |
| AF_Script_UniRange range; |
| |
| if ( clazz->script_uni_ranges == NULL ) |
| continue; |
| |
| /* scan all unicode points in the range, and set the corresponding |
| * glyph script index |
| */ |
| for ( range = clazz->script_uni_ranges; range->first != 0; range++ ) |
| { |
| FT_ULong charcode = range->first; |
| FT_UInt gindex; |
| |
| gindex = FT_Get_Char_Index( face, charcode ); |
| |
| if ( gindex != 0 && |
| gindex < globals->glyph_count && |
| gscripts[ gindex ] == AF_SCRIPT_LIST_NONE ) |
| { |
| gscripts[ gindex ] = (FT_Byte) ss; |
| } |
| for (;;) |
| { |
| charcode = FT_Get_Next_Char( face, charcode, &gindex ); |
| |
| if ( gindex == 0 || charcode > range->last ) |
| break; |
| |
| if ( gindex < globals->glyph_count && |
| gscripts[ gindex ] == AF_SCRIPT_LIST_NONE ) |
| { |
| gscripts[ gindex ] = (FT_Byte) ss; |
| } |
| } |
| } |
| } |
| |
| Exit: |
| /* by default, all uncovered glyphs are set to the latin script |
| * XXX: shouldnt' we disable hinting or do something similar ? |
| */ |
| { |
| FT_UInt nn; |
| |
| for ( nn = 0; nn < globals->glyph_count; nn++ ) |
| { |
| if ( gscripts[ nn ] == AF_SCRIPT_LIST_NONE ) |
| gscripts[ nn ] = AF_SCRIPT_LIST_DEFAULT; |
| } |
| } |
| |
| FT_Set_Charmap( face, old_charmap ); |
| return error; |
| } |
| |
| |
| |
| FT_LOCAL_DEF( FT_Error ) |
| af_face_globals_new( FT_Face face, |
| AF_FaceGlobals *aglobals ) |
| { |
| FT_Error error; |
| FT_Memory memory; |
| AF_FaceGlobals globals; |
| |
| memory = face->memory; |
| |
| if ( !FT_ALLOC( globals, sizeof(*globals) + |
| face->num_glyphs*sizeof(FT_Byte) ) ) |
| { |
| globals->face = face; |
| globals->glyph_count = face->num_glyphs; |
| globals->glyph_scripts = (FT_Byte*)( globals+1 ); |
| |
| error = af_face_globals_compute_script_coverage( globals ); |
| if ( error ) |
| { |
| af_face_globals_free( globals ); |
| globals = NULL; |
| } |
| } |
| |
| *aglobals = globals; |
| return error; |
| } |
| |
| |
| FT_LOCAL_DEF( void ) |
| af_face_globals_free( AF_FaceGlobals globals ) |
| { |
| if ( globals ) |
| { |
| FT_Memory memory = globals->face->memory; |
| FT_UInt nn; |
| |
| for ( nn = 0; nn < AF_SCRIPT_MAX; nn++ ) |
| { |
| if ( globals->metrics[nn] ) |
| { |
| AF_ScriptClass clazz = af_script_classes[nn]; |
| |
| FT_ASSERT( globals->metrics[nn]->clazz == clazz ); |
| |
| if ( clazz->script_metrics_done ) |
| clazz->script_metrics_done( globals->metrics[nn] ); |
| |
| FT_FREE( globals->metrics[nn] ); |
| } |
| } |
| |
| globals->glyph_count = 0; |
| globals->glyph_scripts = NULL; /* no need to free this one !! */ |
| globals->face = NULL; |
| FT_FREE( globals ); |
| } |
| } |
| |
| |
| FT_LOCAL_DEF( FT_Error ) |
| af_face_globals_get_metrics( AF_FaceGlobals globals, |
| FT_UInt gindex, |
| AF_ScriptMetrics *ametrics ) |
| { |
| AF_ScriptMetrics metrics = NULL; |
| FT_UInt index; |
| AF_ScriptClass clazz; |
| FT_Error error = 0; |
| |
| if ( gindex >= globals->glyph_count ) |
| { |
| error = FT_Err_Invalid_Argument; |
| goto Exit; |
| } |
| |
| index = globals->glyph_scripts[ gindex ]; |
| clazz = af_script_classes[ index ]; |
| metrics = globals->metrics[ clazz->script ]; |
| if ( metrics == NULL ) |
| { |
| /* create the global metrics object when needed |
| */ |
| FT_Memory memory = globals->face->memory; |
| |
| if ( FT_ALLOC( metrics, clazz->script_metrics_size ) ) |
| goto Exit; |
| |
| metrics->clazz = clazz; |
| |
| if ( clazz->script_metrics_init ) |
| { |
| error = clazz->script_metrics_init( metrics, globals->face ); |
| if ( error ) |
| { |
| if ( clazz->script_metrics_done ) |
| clazz->script_metrics_done( metrics ); |
| |
| FT_FREE( metrics ); |
| goto Exit; |
| } |
| } |
| |
| globals->metrics[ clazz->script ] = metrics; |
| } |
| |
| Exit: |
| *ametrics = metrics; |
| return error; |
| } |