ref: 3b8db6694128274acc859da0b130fd85e55e52ac
dir: /src/autofit/afglobal.c/
/***************************************************************************/
/* */
/* afglobal.c */
/* */
/* Auto-fitter routines to compute global hinting values (body). */
/* */
/* Copyright 2003, 2004, 2005 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 "aferrors.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 */
};
/* index of default script in `af_script_classes' */
#define AF_SCRIPT_LIST_DEFAULT 1
/* indicates an uncovered glyph */
#define AF_SCRIPT_LIST_NONE 255
/*
* 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;
/* 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;
/* 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 Latin as the standard
* 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[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 gidx;
AF_ScriptClass clazz;
FT_Error error = AF_Err_Ok;
if ( gindex >= globals->glyph_count )
{
error = AF_Err_Invalid_Argument;
goto Exit;
}
gidx = globals->glyph_scripts[gindex];
clazz = af_script_classes[gidx];
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;
}
/* END */