| /***************************************************************************/ |
| /* */ |
| /* afglobal.c */ |
| /* */ |
| /* Auto-fitter routines to compute global hinting values (body). */ |
| /* */ |
| /* Copyright 2003-2013 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" |
| |
| /* get writing system specific header files */ |
| #undef WRITING_SYSTEM |
| #define WRITING_SYSTEM( ws, WS ) /* empty */ |
| #include "afwrtsys.h" |
| |
| #include "aferrors.h" |
| #include "afpic.h" |
| |
| |
| #ifndef FT_CONFIG_OPTION_PIC |
| |
| #undef WRITING_SYSTEM |
| #define WRITING_SYSTEM( ws, WS ) \ |
| &af_ ## ws ## _writing_system_class, |
| |
| FT_LOCAL_ARRAY_DEF( AF_WritingSystemClass ) |
| af_writing_system_classes[] = |
| { |
| |
| #include "afwrtsys.h" |
| |
| NULL /* do not remove */ |
| }; |
| |
| |
| #undef SCRIPT |
| #define SCRIPT( s, S, d ) \ |
| &af_ ## s ## _script_class, |
| |
| FT_LOCAL_ARRAY_DEF( AF_ScriptClass ) |
| af_script_classes[] = |
| { |
| |
| #include "afscript.h" |
| |
| NULL /* do not remove */ |
| }; |
| |
| #endif /* !FT_CONFIG_OPTION_PIC */ |
| |
| |
| #ifdef FT_DEBUG_LEVEL_TRACE |
| |
| #undef SCRIPT |
| #define SCRIPT( s, S, d ) #s, |
| |
| FT_LOCAL_ARRAY_DEF( char* ) |
| af_script_names[] = |
| { |
| |
| #include "afscript.h" |
| |
| }; |
| |
| #endif /* FT_DEBUG_LEVEL_TRACE */ |
| |
| |
| /* 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; |
| FT_Face face = globals->face; |
| FT_CharMap old_charmap = face->charmap; |
| FT_Byte* gscripts = globals->glyph_scripts; |
| FT_UInt ss; |
| FT_UInt i; |
| |
| |
| /* the value AF_SCRIPT_UNASSIGNED means `uncovered glyph' */ |
| FT_MEM_SET( globals->glyph_scripts, |
| AF_SCRIPT_UNASSIGNED, |
| globals->glyph_count ); |
| |
| error = FT_Select_Charmap( face, FT_ENCODING_UNICODE ); |
| if ( error ) |
| { |
| /* |
| * Ignore this error; we simply use the fallback script. |
| * XXX: Shouldn't we rather disable hinting? |
| */ |
| error = FT_Err_Ok; |
| goto Exit; |
| } |
| |
| /* scan each script in a Unicode charmap */ |
| for ( ss = 0; AF_SCRIPT_CLASSES_GET[ss]; ss++ ) |
| { |
| AF_ScriptClass script_class = AF_SCRIPT_CLASSES_GET[ss]; |
| AF_Script_UniRange range; |
| |
| |
| if ( script_class->script_uni_ranges == NULL ) |
| continue; |
| |
| /* |
| * Scan all Unicode points in the range and set the corresponding |
| * glyph script index. |
| */ |
| for ( range = script_class->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_UNASSIGNED ) |
| 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_UNASSIGNED ) |
| 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 fallback script. |
| * XXX: Shouldn't we disable hinting or do something similar? |
| */ |
| if ( globals->module->fallback_script != AF_SCRIPT_UNASSIGNED ) |
| { |
| FT_Long nn; |
| |
| |
| for ( nn = 0; nn < globals->glyph_count; nn++ ) |
| { |
| if ( ( gscripts[nn] & ~AF_DIGIT ) == AF_SCRIPT_UNASSIGNED ) |
| { |
| gscripts[nn] &= ~AF_SCRIPT_UNASSIGNED; |
| gscripts[nn] |= globals->module->fallback_script; |
| } |
| } |
| } |
| |
| FT_Set_Charmap( face, old_charmap ); |
| return error; |
| } |
| |
| |
| FT_LOCAL_DEF( FT_Error ) |
| af_face_globals_new( FT_Face face, |
| AF_FaceGlobals *aglobals, |
| AF_Module module ) |
| { |
| 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 ) ) ) |
| goto Exit; |
| |
| globals->face = face; |
| globals->glyph_count = face->num_glyphs; |
| globals->glyph_scripts = (FT_Byte*)( globals + 1 ); |
| globals->module = module; |
| |
| error = af_face_globals_compute_script_coverage( globals ); |
| if ( error ) |
| { |
| af_face_globals_free( globals ); |
| globals = NULL; |
| } |
| |
| globals->increase_x_height = AF_PROP_INCREASE_X_HEIGHT_MAX; |
| |
| Exit: |
| *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 script_class = |
| AF_SCRIPT_CLASSES_GET[nn]; |
| AF_WritingSystemClass writing_system_class = |
| AF_WRITING_SYSTEM_CLASSES_GET[script_class->writing_system]; |
| |
| |
| if ( writing_system_class->script_metrics_done ) |
| writing_system_class->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; |
| |
| AF_Script script = (AF_Script)( options & 15 ); |
| AF_WritingSystemClass writing_system_class; |
| AF_ScriptClass script_class; |
| |
| FT_Error error = FT_Err_Ok; |
| |
| |
| if ( gindex >= (FT_ULong)globals->glyph_count ) |
| { |
| error = FT_THROW( Invalid_Argument ); |
| goto Exit; |
| } |
| |
| /* if we have a forced script (via `options'), use it, */ |
| /* otherwise look into `glyph_scripts' array */ |
| if ( script == AF_SCRIPT_NONE || script + 1 >= AF_SCRIPT_MAX ) |
| script = (AF_Script)( globals->glyph_scripts[gindex] & |
| AF_SCRIPT_UNASSIGNED ); |
| |
| script_class = AF_SCRIPT_CLASSES_GET[script]; |
| writing_system_class = AF_WRITING_SYSTEM_CLASSES_GET |
| [script_class->writing_system]; |
| |
| metrics = globals->metrics[script]; |
| if ( metrics == NULL ) |
| { |
| /* create the global metrics object if necessary */ |
| FT_Memory memory = globals->face->memory; |
| |
| |
| if ( FT_ALLOC( metrics, writing_system_class->script_metrics_size ) ) |
| goto Exit; |
| |
| metrics->script_class = script_class; |
| metrics->globals = globals; |
| |
| if ( writing_system_class->script_metrics_init ) |
| { |
| error = writing_system_class->script_metrics_init( metrics, |
| globals->face ); |
| if ( error ) |
| { |
| if ( writing_system_class->script_metrics_done ) |
| writing_system_class->script_metrics_done( metrics ); |
| |
| FT_FREE( metrics ); |
| goto Exit; |
| } |
| } |
| |
| globals->metrics[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 */ |
