ref: 507405369b07084a1761aeac066dc469e1c46b38
dir: /src/autofit/afglobal.c/
/***************************************************************************/
/* */
/* 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_NONE means `uncovered glyph' */
FT_MEM_SET( globals->glyph_scripts,
AF_SCRIPT_NONE,
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_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_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 fallback script.
* XXX: Shouldn't we disable hinting or do something similar?
*/
if ( globals->module->fallback_script != AF_SCRIPT_NONE )
{
FT_Long nn;
for ( nn = 0; nn < globals->glyph_count; nn++ )
{
if ( ( gscripts[nn] & ~AF_DIGIT ) == AF_SCRIPT_NONE )
{
gscripts[nn] &= ~AF_SCRIPT_NONE;
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_DFLT || script + 1 >= AF_SCRIPT_MAX )
script = (AF_Script)( globals->glyph_scripts[gindex] & AF_SCRIPT_NONE );
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 */