| /***************************************************************************/ |
| /* */ |
| /* afglobal.c */ |
| /* */ |
| /* Auto-fitter routines to compute global hinting values (body). */ |
| /* */ |
| /* Copyright 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 by */ |
| /* David Turner, Robert Wilhelm, and Werner Lemberg. */ |
| /* */ |
| /* This file is part of the FreeType project, and may only be used, */ |
| /* modified, and distributed under the terms of the FreeType project */ |
| /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ |
| /* this file you indicate that you have read the license and */ |
| /* understand and accept it fully. */ |
| /* */ |
| /***************************************************************************/ |
| |
| |
| #include "afglobal.h" |
| #include "afdummy.h" |
| #include "aflatin.h" |
| #include "afcjk.h" |
| #include "afindic.h" |
| #include "afpic.h" |
| |
| #include "aferrors.h" |
| |
| #ifdef FT_OPTION_AUTOFIT2 |
| #include "aflatin2.h" |
| #endif |
| |
| #ifndef FT_CONFIG_OPTION_PIC |
| |
| /* when updating this table, don't forget to update |
| AF_SCRIPT_CLASSES_COUNT and autofit_module_class_pic_init */ |
| |
| /* populate this list when you add new scripts */ |
| static AF_ScriptClass const af_script_classes[] = |
| { |
| &af_dummy_script_class, |
| #ifdef FT_OPTION_AUTOFIT2 |
| &af_latin2_script_class, |
| #endif |
| &af_latin_script_class, |
| &af_cjk_script_class, |
| &af_indic_script_class, |
| NULL /* do not remove */ |
| }; |
| |
| #endif /* FT_CONFIG_OPTION_PIC */ |
| |
| /* index of default script in `af_script_classes' */ |
| #define AF_SCRIPT_LIST_DEFAULT 2 |
| /* a bit mask indicating an uncovered glyph */ |
| #define AF_SCRIPT_LIST_NONE 0x7F |
| /* if this flag is set, we have an ASCII digit */ |
| #define AF_DIGIT 0x80 |
| |
| |
| /* |
| * 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_Long glyph_count; /* same as face->num_glyphs */ |
| FT_Byte* glyph_scripts; |
| |
| AF_ScriptMetrics metrics[AF_SCRIPT_MAX]; |
| |
| } AF_FaceGlobalsRec; |
| |
| |
| /* 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 = AF_Err_Ok; |
| FT_Face face = globals->face; |
| FT_CharMap old_charmap = face->charmap; |
| FT_Byte* gscripts = globals->glyph_scripts; |
| FT_UInt ss, i; |
| |
| |
| /* 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 simply use the default script. |
| * XXX: Shouldn't we rather disable hinting? |
| */ |
| error = AF_Err_Ok; |
| goto Exit; |
| } |
| |
| /* scan each script in a Unicode charmap */ |
| for ( ss = 0; AF_SCRIPT_CLASSES_GET[ss]; ss++ ) |
| { |
| AF_ScriptClass clazz = AF_SCRIPT_CLASSES_GET[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 < (FT_ULong)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 < (FT_ULong)globals->glyph_count && |
| gscripts[gindex] == AF_SCRIPT_LIST_NONE ) |
| { |
| gscripts[gindex] = (FT_Byte)ss; |
| } |
| } |
| } |
| } |
| |
| /* mark ASCII digits */ |
| for ( i = 0x30; i <= 0x39; i++ ) |
| { |
| FT_UInt gindex = FT_Get_Char_Index( face, i ); |
| |
| |
| if ( gindex != 0 && gindex < (FT_ULong)globals->glyph_count ) |
| gscripts[gindex] |= AF_DIGIT; |
| } |
| |
| Exit: |
| /* |
| * By default, all uncovered glyphs are set to the latin script. |
| * XXX: Shouldn't we disable hinting or do something similar? |
| */ |
| { |
| FT_Long nn; |
| |
| |
| for ( nn = 0; nn < globals->glyph_count; nn++ ) |
| { |
| if ( ( gscripts[nn] & ~AF_DIGIT ) == AF_SCRIPT_LIST_NONE ) |
| { |
| 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 = NULL; |
| |
| |
| 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_GET[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, |
| FT_UInt options, |
| AF_ScriptMetrics *ametrics ) |
| { |
| AF_ScriptMetrics metrics = NULL; |
| FT_UInt gidx; |
| AF_ScriptClass clazz; |
| FT_UInt script = options & 15; |
| const FT_Offset script_max = sizeof ( AF_SCRIPT_CLASSES_GET ) / |
| sizeof ( AF_SCRIPT_CLASSES_GET[0] ); |
| FT_Error error = AF_Err_Ok; |
| |
| |
| if ( gindex >= (FT_ULong)globals->glyph_count ) |
| { |
| error = AF_Err_Invalid_Argument; |
| goto Exit; |
| } |
| |
| gidx = script; |
| if ( gidx == 0 || gidx + 1 >= script_max ) |
| gidx = globals->glyph_scripts[gindex] & AF_SCRIPT_LIST_NONE; |
| |
| clazz = AF_SCRIPT_CLASSES_GET[gidx]; |
| if ( script == 0 ) |
| script = clazz->script; |
| |
| 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; |
| } |
| |
| |
| FT_LOCAL_DEF( FT_Bool ) |
| af_face_globals_is_digit( AF_FaceGlobals globals, |
| FT_UInt gindex ) |
| { |
| if ( gindex < (FT_ULong)globals->glyph_count ) |
| return (FT_Bool)( globals->glyph_scripts[gindex] & AF_DIGIT ); |
| |
| return (FT_Bool)0; |
| } |
| |
| |
| /* END */ |
