freetype2/src/type1/t1afm.c

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/***************************************************************************/
/* */
/* t1afm.c */
/* */
/* AFM support for Type 1 fonts (body). */
/* */
/* Copyright 1996-2001 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. */
/* */
/***************************************************************************/
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#include <ft2build.h>
#include "t1afm.h"
#include FT_INTERNAL_STREAM_H
#include FT_INTERNAL_TYPE1_TYPES_H
#include <stdlib.h> /* for qsort() */
#include <string.h> /* for strcmp() */
#include <ctype.h> /* for isalnum() */
/*************************************************************************/
/* */
/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
/* messages during execution. */
/* */
#undef FT_COMPONENT
#define FT_COMPONENT trace_t1afm
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FT_LOCAL_DEF void
T1_Done_AFM( FT_Memory memory,
T1_AFM* afm )
{
FREE( afm->kern_pairs );
afm->num_pairs = 0;
FREE( afm );
}
#undef IS_KERN_PAIR
#define IS_KERN_PAIR( p ) ( p[0] == 'K' && p[1] == 'P' )
#define IS_ALPHANUM( c ) ( isalnum( c ) || \
c == '_' || \
c == '.' )
/* read a glyph name and return the equivalent glyph index */
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static FT_UInt
afm_atoindex( FT_Byte** start,
FT_Byte* limit,
T1_Font* type1 )
{
FT_Byte* p = *start;
FT_Int len;
FT_UInt result = 0;
char temp[64];
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/* skip whitespace */
while ( ( *p == ' ' || *p == '\t' || *p == ':' || *p == ';' ) &&
p < limit )
p++;
*start = p;
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/* now, read glyph name */
while ( IS_ALPHANUM( *p ) && p < limit )
p++;
len = (FT_Int)( p - *start );
if ( len > 0 && len < 64 )
{
FT_Int n;
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/* copy glyph name to intermediate array */
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MEM_Copy( temp, *start, len );
temp[len] = 0;
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/* lookup glyph name in face array */
for ( n = 0; n < type1->num_glyphs; n++ )
{
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char* gname = (char*)type1->glyph_names[n];
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if ( gname && gname[0] == temp[0] && strcmp( gname, temp ) == 0 )
{
result = n;
break;
}
}
}
*start = p;
return result;
}
/* read an integer */
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static int
afm_atoi( FT_Byte** start,
FT_Byte* limit )
{
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FT_Byte* p = *start;
int sum = 0;
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int sign = 1;
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/* skip everything that is not a number */
while ( p < limit && !isdigit( *p ) )
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{
sign = 1;
if ( *p == '-' )
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sign = -1;
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p++;
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}
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while ( p < limit && isdigit( *p ) )
{
sum = sum * 10 + ( *p - '0' );
p++;
}
*start = p;
return sum * sign;
}
#undef KERN_INDEX
#define KERN_INDEX( g1, g2 ) ( ( (FT_ULong)g1 << 16 ) | g2 )
/* compare two kerning pairs */
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FT_CALLBACK_DEF( int )
compare_kern_pairs( const void* a,
const void* b )
{
T1_Kern_Pair* pair1 = (T1_Kern_Pair*)a;
T1_Kern_Pair* pair2 = (T1_Kern_Pair*)b;
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FT_ULong index1 = KERN_INDEX( pair1->glyph1, pair1->glyph2 );
FT_ULong index2 = KERN_INDEX( pair2->glyph1, pair2->glyph2 );
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return ( index1 - index2 );
}
/* parse an AFM file -- for now, only read the kerning pairs */
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FT_LOCAL_DEF FT_Error
T1_Read_AFM( FT_Face t1_face,
FT_Stream stream )
{
FT_Error error;
FT_Memory memory = stream->memory;
FT_Byte* start;
FT_Byte* limit;
FT_Byte* p;
FT_Int count = 0;
T1_Kern_Pair* pair;
T1_Font* type1 = &((T1_Face)t1_face)->type1;
T1_AFM* afm = 0;
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if ( ACCESS_Frame( stream->size ) )
return error;
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start = (FT_Byte*)stream->cursor;
limit = (FT_Byte*)stream->limit;
p = start;
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/* we are now going to count the occurences of `KP' or `KPX' in */
/* the AFM file */
count = 0;
for ( p = start; p < limit - 3; p++ )
{
if ( IS_KERN_PAIR( p ) )
count++;
}
/* Actually, kerning pairs are simply optional! */
if ( count == 0 )
goto Exit;
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/* allocate the pairs */
if ( ALLOC( afm, sizeof ( *afm ) ) ||
ALLOC_ARRAY( afm->kern_pairs, count, T1_Kern_Pair ) )
goto Exit;
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/* now, read each kern pair */
pair = afm->kern_pairs;
afm->num_pairs = count;
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/* save in face object */
((T1_Face)t1_face)->afm_data = afm;
t1_face->face_flags |= FT_FACE_FLAG_KERNING;
for ( p = start; p < limit - 3; p++ )
{
if ( IS_KERN_PAIR( p ) )
{
FT_Byte* q;
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/* skip keyword (KP or KPX) */
q = p + 2;
if ( *q == 'X' )
q++;
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pair->glyph1 = afm_atoindex( &q, limit, type1 );
pair->glyph2 = afm_atoindex( &q, limit, type1 );
pair->kerning.x = afm_atoi( &q, limit );
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pair->kerning.y = 0;
if ( p[2] != 'X' )
pair->kerning.y = afm_atoi( &q, limit );
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pair++;
}
}
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/* now, sort the kern pairs according to their glyph indices */
qsort( afm->kern_pairs, count, sizeof ( T1_Kern_Pair ),
compare_kern_pairs );
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Exit:
if ( error )
FREE( afm );
FORGET_Frame();
return error;
}
/* find the kerning for a given glyph pair */
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FT_LOCAL_DEF void
T1_Get_Kerning( T1_AFM* afm,
FT_UInt glyph1,
FT_UInt glyph2,
FT_Vector* kerning )
{
T1_Kern_Pair *min, *mid, *max;
FT_ULong index = KERN_INDEX( glyph1, glyph2 );
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/* simple binary search */
min = afm->kern_pairs;
max = min + afm->num_pairs - 1;
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while ( min <= max )
{
FT_ULong midi;
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mid = min + ( max - min ) / 2;
midi = KERN_INDEX( mid->glyph1, mid->glyph2 );
if ( midi == index )
{
*kerning = mid->kerning;
return;
}
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if ( midi < index )
min = mid + 1;
else
max = mid - 1;
}
kerning->x = 0;
kerning->y = 0;
}
/* END */