David Turner
21 years ago
parent
0b58b0a94c
commit
25f45461ed
13 changed files with 1970 additions and 379 deletions
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#include "afglobal.h" |
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#include "aflatin.h" |
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/* populate this list when you add new scripts
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*/ |
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static AF_ScriptClass const af_script_class_list[] = |
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{ |
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& af_latin_script_class, |
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NULL /* do not remove */ |
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}; |
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#define AF_SCRIPT_LIST_DEFAULT 0 /* index of default script in 'af_script_class_list' */ |
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#define AF_SCRIPT_LIST_NONE 255 /* indicates an uncovered glyph */ |
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/*
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* note that glyph_scripts[] is used to map each glyph into |
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* an index into the 'af_script_class_list' array. |
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* |
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*/ |
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typedef struct AF_FaceGlobalsRec_ |
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{ |
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FT_Face face; |
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FT_UInt glyph_count; /* same as face->num_glyphs */ |
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FT_Byte* glyph_scripts; |
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AF_ScriptMetrics metrics[ AF_SCRIPT_MAX ]; |
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} AF_FaceGlobalsRec, *AF_FaceGlobals; |
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/* this function is used to compute the script index of each glyph
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* within a given face |
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*/ |
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static FT_Error |
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af_face_globals_compute_script_coverage( AF_FaceGlobals globals ) |
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{ |
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FT_Error error = 0; |
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FT_Face face = globals->face; |
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FT_CharMap old_charmap = face->charmap; |
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FT_Byte* gscripts = globals->glyph_scripts; |
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FT_UInt ss; |
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/* the value 255 means "uncovered glyph"
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*/ |
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FT_MEM_SET( globals->glyph_scripts, |
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AF_SCRIPT_LIST_NONE, |
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globals->glyph_count ); |
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error = FT_Select_Charmap( face, FT_ENCODING_UNICODE ); |
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if ( error ) |
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{ |
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/* ignore this error, we'll simply use Latin as the standard
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* script. XXX: Shouldn't we rather disable hinting ?? |
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*/ |
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error = 0; |
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goto Exit; |
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} |
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/* scan each script in a Unicode charmap
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*/ |
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for ( ss = 0; af_script_classes[ss]; ss++ ) |
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{ |
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AF_ScriptClass clazz = af_script_classes[ss]; |
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AF_Script_UniRange range; |
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/* scan all unicode points in the range, and set the corresponding
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* glyph script index |
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*/ |
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for ( range = clazz->script_uni_ranges; range->first != 0; range++ ) |
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{ |
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FT_ULong charcode = range->first; |
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FT_UInt gindex; |
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gindex = FT_Get_Char_Index( face, charcode ); |
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if ( gindex != 0 && |
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gindex < globals->glyph_count && |
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gscripts[ gindex ] == AF_SCRIPT_LIST_NONE ) |
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{ |
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gscripts[ gindex ] = (FT_Byte) ss; |
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} |
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for (;;) |
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{ |
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charcode = FT_Get_Next_Char( face, charcode, &gindex ); |
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if ( gindex == 0 || charcode > range->last ) |
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break; |
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if ( gindex < globals->glyph_count && |
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gscripts[ gindex ] == AF_SCRIPT_LIST_NONE ) |
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{ |
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gscripts[ gindex ] = (FT_Byte) ss; |
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} |
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} |
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} |
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} |
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Exit: |
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/* by default, all uncovered glyphs are set to the latin script
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* XXX: shouldnt' we disable hinting or do something similar ? |
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*/ |
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{ |
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FT_UInt nn; |
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for ( nn = 0; nn < globals->glyph_count; nn++ ) |
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{ |
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if ( gscripts[ nn ] == AF_SCRIPT_LIST_NONE ) |
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gscripts[ nn ] = AF_SCRIPT_LIST_DEFAULT; |
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} |
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} |
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FT_Set_Charmap( face, old_charmap ); |
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return error; |
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} |
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FT_LOCAL_DEF( FT_Error ) |
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af_face_globals_new( FT_Face face, |
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AF_FaceGlobals *aglobals ) |
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{ |
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FT_Error error; |
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FT_Memory memory; |
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AF_FaceGlobals globals; |
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memory = face->memory; |
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if ( !FT_ALLOC( globals, sizeof(*globals) + |
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face->num_glyphs*sizeof(FT_Byte) ) ) |
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{ |
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globals->face = face; |
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globals->glyph_count = face->num_glyphs; |
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globals->glyph_scripts = (FT_Byte*)( globals+1 ); |
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error = af_face_globals_compute_script_coverage( globals ); |
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if ( error ) |
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{ |
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af_face_globals_free( globals ); |
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globals = NULL; |
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} |
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} |
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Exit: |
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*aglobals = globals; |
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return error; |
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} |
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FT_LOCAL_DEF( void ) |
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af_face_globals_free( AF_FaceGlobals globals ) |
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{ |
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if ( globals ) |
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{ |
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FT_Memory memory = globals->face->memory; |
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FT_UInt nn; |
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for ( nn = 0; nn < AF_SCRIPT_MAX; nn++ ) |
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{ |
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if ( globals->metrics[nn] ) |
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{ |
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AF_ScriptClass clazz = af_script_classes[nn]; |
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FT_ASSERT( globals->metrics[nn].clazz == clazz ); |
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if ( clazz->script_metrics_done ) |
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clazz->script_metrics_done( globals->metrics[nn] ); |
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FT_FREE( globals->metrics[nn] ); |
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} |
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} |
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globals->glyph_count = NULL; |
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globals->glyph_scripts = NULL; /* no need to free this one !! */ |
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globals->face = NULL; |
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FT_FREE( globals ); |
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} |
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} |
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FT_LOCAL_DEF( FT_Error ) |
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af_face_globals_get_metrics( AF_FaceGlobals globals, |
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FT_UInt gindex, |
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AF_ScriptMetrics *ametrics ) |
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{ |
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FT_Script script; |
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AF_ScriptMetrics metrics = NULL; |
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FT_UInt index; |
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AF_ScriptClass clazz; |
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FT_Error error; |
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if ( gindex >= globals->glyph_count ) |
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{ |
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error = FT_Err_Invalid_Argument; |
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goto Exit; |
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} |
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index = globals->glyph_scripts[ gindex ]; |
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clazz = af_script_class_list[ index ]; |
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metrics = globals->metrics[ clazz->script ]; |
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if ( metrics == NULL ) |
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{ |
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/* create the global metrics object when needed
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*/ |
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if ( FT_ALLOC( metrics, clazz->script_metrics_size ) ) |
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goto Exit; |
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metrics->clazz = clazz; |
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if ( clazz->script_metrics_init ) |
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{ |
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error = clazz->script_metrics_init( metrics, face ); |
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if ( error ) |
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{ |
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if ( clazz->script_metrics_done ) |
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clazz->script_metrics_done( metrics ); |
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FT_FREE( metrics ); |
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goto Exit; |
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} |
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} |
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globals->metrics[ script ] = metrics; |
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} |
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Exit: |
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*ametrics = metrics; |
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return error; |
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} |
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@ -0,0 +1,42 @@ |
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#ifndef __AF_GLOBAL_H__ |
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#define __AF_GLOBAL_H__ |
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#include "aftypes.h" |
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FT_BEGIN_HEADER |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/***** *****/ |
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/***** F A C E G L O B A L S *****/ |
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/***** *****/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/*
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* models the global hints data for a given face, decomposed into |
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* script-specific items.. |
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* |
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*/ |
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typedef struct AF_FaceGlobalsRec_* AF_FaceGlobals; |
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FT_LOCAL( FT_Error ) |
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af_face_globals_new( FT_Face face, |
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AF_FaceGlobals *aglobals ); |
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FT_LOCAL( FT_Error ) |
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af_face_globals_get_metrics( AF_FaceGlobals globals, |
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FT_UInt gindex, |
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AF_ScriptMetrics *ametrics ); |
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FT_LOCAL( void ) |
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af_face_globals_free( AF_FaceGlobals globals ); |
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/* */ |
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FT_END_HEADER |
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#endif /* __AF_GLOBALS_H__ */ |
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