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freetype2
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Code Issues 4 Releases Wiki Activity

* src/otlayout/otlayout.h, src/otlyaout/otlconf.h, 

src/otlayout/otlgsub.c, src/otlayout/otlgsub.h, src/otlayout/otlparse.c,
        src/otlayout/otlparse.h, src/otlayout/otlutils.h:

          updating the OpenType Layout code, adding support fot the first
          GSUB lookups. Nothing that really compiles for now though

        * src/autohint/ahhint.c: disabled serif stem width quantization. It
        produces slightly better shapes though this is not distinguishable
        with many fonts.
This commit is contained in:
David Turner 2002-11-07 01:36:29 +00:00
parent 60b32e16e7
commit e57ca7dec6
8 changed files with 554 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
ChangeLog
View File

@ -1,3 +1,12 @@
2002-11-07 David Turner <david@freetype.org>
* src/otlayout/otlayout.h, src/otlyaout/otlconf.h,
src/otlayout/otlgsub.c, src/otlayout/otlgsub.h, src/otlayout/otlparse.c,
src/otlayout/otlparse.h, src/otlayout/otlutils.h:
updating the OpenType Layout code, adding support fot the first
GSUB lookups. Nothing that really compiles for now though
2002-11-05 David Turner <david@freetype.org>
* include/freetype/config/ftoption.h, src/gzip/ftgzip.c: added

41
src/otlayout/otlayout.h
View File

@ -24,9 +24,13 @@ OTL_BEGIN_HEADER
typedef int OTL_Int;
typedef unsigned int OTL_UInt;
typedef long OTL_Long;
typedef unsigned long OTL_ULong;
typedef short OTL_Int16;
typedef unsigned short OTL_UInt16;
#if OTL_SIZEOF_INT == 4
typedef int OTL_Int32;
@ -58,9 +62,38 @@ OTL_BEGIN_HEADER
OTL_Err_InvalidFormat,
OTL_Err_InvalidOffset,
OTL_Err_Max
} OTL_Error;
/************************************************************************/
/************************************************************************/
/***** *****/
/***** MEMORY MANAGEMENT *****/
/***** *****/
/************************************************************************/
/************************************************************************/
typedef OTL_Pointer (*OTL_AllocFunc)( OTL_ULong size,
OTL_Pointer data );
typedef OTL_Pointer (*OTL_ReallocFunc)( OTL_Pointer block,
OTL_ULong size,
OTL_Pointer data );
typedef void (*OTL_FreeFunc)( OTL_Pointer block,
OTL_Pointer data );
typedef struct OTL_MemoryRec_
{
OTL_Pointer mem_data;
OTL_AllocFunc mem_alloc;
OTL_ReallocFunc mem_realloc;
OTL_FreeFunc mem_free;
} OTL_MemoryRec, *OTL_Memory;
/************************************************************************/
/************************************************************************/
/***** *****/
@ -69,11 +102,15 @@ OTL_BEGIN_HEADER
/************************************************************************/
/************************************************************************/
/* re-define OTL_MAKE_TAG to something different if you're not */
/* using an ASCII-based character set (Vaxes anyone ?) */
#ifndef OTL_MAKE_TAG
#define OTL_MAKE_TAG(c1,c2,c3,c4) \
( ( (OTL_UInt32)(c1) << 24 ) | \
(OTL_UInt32)(c2) << 16 ) | \
(OTL_UInt32)(c3) << 8 ) | \
(OTL_UInt32)(c4) )
#endif
typedef enum OTL_ScriptTag_
{
@ -153,8 +190,8 @@ OTL_BEGIN_HEADER
#define OTL_INVALID(e) otl_validator_error( valid, e )
#define OTL_INVALID_TOO_SHORT OTL_INVALID( OTL_Err_InvalidOffset );
#define OTL_INVALID_DATA OTL_INVALID( OTL_Err_InvalidFormat );
#define OTL_INVALID_TOO_SHORT OTL_INVALID( OTL_Err_InvalidOffset )
#define OTL_INVALID_DATA OTL_INVALID( OTL_Err_InvalidFormat )
#define OTL_CHECK(_count) OTL_BEGIN_STMNT \
if ( p + (_count) > valid->limit ) \

9
src/otlayout/otlconf.h
View File

@ -43,10 +43,10 @@
#define OTL_BEGIN_STMNT do {
#define OTL_END_STMNT } while (0)
#define OTL_DUMMY_STMNT do { } while (0)
#define OTL_DUMMY_STMNT OTL_BEGIN_STMNT OTL_END_STMNT
#define OTL_UNUSED( x ) (x)=(x)
#define OTL_UNUSED_CONST(x) (void)(x)
#define OTL_UNUSED_CONST(x) (void)(x)
#include <limits.h>
@ -68,6 +68,11 @@
# error "unsupported number of bytes in 'long' type!"
#endif
#include <setjmp.h>
#define OTL_jmp_buf jmp_buf
#define otl_setjmp setjmp
#define otl_longjmp longjmp
/* */
#endif /* __OT_LAYOUT_CONFIG_H__ */

213
src/otlayout/otlgsub.c
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@ -9,6 +9,28 @@
/************************************************************************/
/************************************************************************/
/*
* 1: Single Substitution - Table format(s)
*
* This table is used to substiture individual glyph indices
* with another one. There are only two sub-formats:
*
* Name Offset Size Description
* ------------------------------------------
* format 0 2 sub-table format (1)
* offset 2 2 offset to coverage table
* delta 4 2 16-bit delta to apply on all
* covered glyph indices
*
* Name Offset Size Description
* ------------------------------------------
* format 0 2 sub-table format (2)
* offset 2 2 offset to coverage table
* count 4 2 coverage table count
* substs[] 6 2*count substituted glyph indices,
*
*/
static void
otl_gsub_lookup1_validate( OTL_Bytes table,
OTL_Validator valid )
@ -42,6 +64,10 @@
otl_coverage_validate( table + coverage, valid );
OTL_CHECK( 2*count );
/* NB: we don't check that there are at most 'count' */
/* elements in the coverage table. This is delayed */
/* to the lookup function... */
}
break;
@ -51,6 +77,63 @@
}
static OTL_Bool
otl_gsub_lookup1_apply( OTL_Bytes table,
OTL_Parser parser )
{
OTL_Bytes p = table;
OTL_Bytes coverage;
OTL_UInt format, gindex, property;
OTL_Int index;
OTL_Bool subst = 0;
if ( parser->context_len != 0xFFFF && parser->context_len < 1 )
goto Exit;
gindex = otl_parser_get_gindex( parser );
if ( !otl_parser_check_property( parser, gindex, &property ) )
goto Exit;
format = OTL_NEXT_USHORT(p);
coverage = table + OTL_NEXT_USHORT(p);
index = otl_coverage_lookup( coverage, gindex );
if ( index >= 0 )
{
switch ( format )
{
case 1:
{
OTL_Int delta = OTL_NEXT_SHORT(p);
gindex = ( gindex + delta ) & 0xFFFF;
otl_parser_replace_1( parser, gindex );
subst = 1;
}
break;
case 2:
{
OTL_UInt count = OTL_NEXT_USHORT(p);
if ( (OTL_UInt) index < count )
{
p += index*2;
otl_parser_replace_1( parser, OTL_PEEK_USHORT(p) );
subst = 1;
}
}
break;
default:
;
}
}
Exit:
return subst;
}
/************************************************************************/
/************************************************************************/
/***** *****/
@ -59,6 +142,26 @@
/************************************************************************/
/************************************************************************/
/*
* 2: Multiple Substitution - Table format(s)
*
* Replaces a single glyph with one or more glyphs.
*
* Name Offset Size Description
* -----------------------------------------------------------
* format 0 2 sub-table format (1)
* offset 2 2 offset to coverage table
* count 4 2 coverage table count
* sequencess[] 6 2*count offsets to sequence items
*
* each sequence item has the following format:
*
* Name Offset Size Description
* -----------------------------------------------------------
* count 0 2 number of replacement glyphs
* gindices[] 2 2*count string of glyph indices
*/
static void
otl_seq_validate( OTL_Bytes table,
OTL_Validator valid )
@ -69,6 +172,9 @@
OTL_CHECK( 2 );
count = OTL_NEXT_USHORT( p );
/* XXX: according to the spec, 'count' should be > 0 */
/* we can deal with these cases pretty well however */
OTL_CHECK( 2*count );
/* check glyph indices */
}
@ -106,6 +212,45 @@
}
}
static OTL_Bool
otl_gsub_lookup2_apply( OTL_Bytes table,
OTL_Parser parser )
{
OTL_Bytes p = table;
OTL_Bytes coverage, sequence;
OTL_UInt format, gindex, index, property;
OTL_Int index;
OTL_Bool subst = 0;
if ( context_len != 0xFFFF && context_len < 1 )
goto Exit;
gindex = otl_parser_get_gindex( parser );
if ( !otl_parser_check_property( parser, gindex, &property ) )
goto Exit;
p += 2; /* skip format */
coverage = table + OTL_NEXT_USHORT(p);
seq_count = OTL_NEXT_USHORT(p);
index = otl_coverage_lookup( coverage, gindex );
if ( (OTL_UInt) index >= seq_count )
goto Exit;
p += index*2;
sequence = table + OTL_PEEK_USHORT(p);
p = sequence;
count = OTL_NEXT_USHORT(p);
otl_parser_replace_n( parser, count, p );
subst = 1;
Exit:
return subst;
}
/************************************************************************/
/************************************************************************/
/***** *****/
@ -114,6 +259,28 @@
/************************************************************************/
/************************************************************************/
/*
* 3: Alternate Substitution - Table format(s)
*
* Replaces a single glyph by another one taken liberally
* in a list of alternatives
*
* Name Offset Size Description
* -----------------------------------------------------------
* format 0 2 sub-table format (1)
* offset 2 2 offset to coverage table
* count 4 2 coverage table count
* alternates[] 6 2*count offsets to alternate items
*
* each alternate item has the following format:
*
* Name Offset Size Description
* -----------------------------------------------------------
* count 0 2 number of replacement glyphs
* gindices[] 2 2*count string of glyph indices, each one
* is a valid alternative
*/
static void
otl_alternate_set_validate( OTL_Bytes table,
OTL_Validator valid )
@ -162,6 +329,52 @@
}
static OTL_Bool
otl_gsub_lookup3_apply( OTL_Bytes table,
OTL_Parser parser )
{
OTL_Bytes p = table;
OTL_Bytes coverage, alternates;
OTL_UInt format, gindex, index, property;
OTL_Int index;
OTL_Bool subst = 0;
OTL_GSUB_Alternate alternate = parser->alternate;
if ( context_len != 0xFFFF && context_len < 1 )
goto Exit;
if ( alternate == NULL )
goto Exit;
gindex = otl_parser_get_gindex( parser );
if ( !otl_parser_check_property( parser, gindex, &property ) )
goto Exit;
p += 2; /* skip format */
coverage = table + OTL_NEXT_USHORT(p);
seq_count = OTL_NEXT_USHORT(p);
index = otl_coverage_lookup( coverage, gindex );
if ( (OTL_UInt) index >= seq_count )
goto Exit;
p += index*2;
alternates = table + OTL_PEEK_USHORT(p);
p = alternates;
count = OTL_NEXT_USHORT(p);
gindex = alternate->handler_func(
gindex, count, p, alternate->handler_data );
otl_parser_replace_1( parser, gindex );
subst = 1;
Exit:
return subst;
}
/************************************************************************/
/************************************************************************/
/***** *****/

12
src/otlayout/otlgsub.h
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@ -5,6 +5,18 @@
OTL_BEGIN_HEADER
typedef OTL_UInt (*OTL_GSUB_AlternateFunc)( OTL_UInt gindex,
OTL_UInt count,
OTL_Bytes alternates,
OTL_Pointer data );
typedef struct OTL_GSUB_AlternateRec_
{
OTL_GSUB_AlternateFunc handler_func;
OTL_Pointer handler_data;
} OTL_GSUB_AlternateRec, *OTL_GSUB_Alternate;
OTL_LOCAL( void )
otl_gsub_validate( OTL_Bytes table,
OTL_Validator valid );

142
src/otlayout/otlparse.c Normal file
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@ -0,0 +1,142 @@
#include "otlparse.h"
#include "otlutils.h"
static void
otl_string_ensure( OTL_String string,
OTL_UInt count,
OTL_Parser parser )
{
count += string->length;
if ( count > string->capacity )
{
OTL_UInt old_count = string->capacity;
OTL_UInt new_count = old_count;
OTL_Memory memory = parser->memory;
while ( new_count < count )
new_count += (new_count >> 1) + 16;
if ( OTL_MEM_RENEW_ARRAY( string->glyphs, old_count, new_count ) )
otl_parser_error( parser, OTL_Parse_Err_Memory );
string->capacity = new_count;
}
}
#define OTL_STRING_ENSURE(str,count,parser) \
OTL_BEGIN_STMNT \
if ( (str)->length + (count) > (str)>capacity ) \
otl_string_ensure( str, count, parser ); \
OTL_END_STMNT
OTL_LOCALDEF( OTL_UInt )
otl_parser_get_gindex( OTL_Parser parser )
{
OTL_String in = parser->str_in;
if ( in->cursor >= in->num_glyphs )
otl_parser_error( parser, OTL_Err_Parser_Internal );
return in->str[ in->cursor ].gindex;
}
OTL_LOCALDEF( void )
otl_parser_error( OTL_Parser parser,
OTL_ParseError error; )
{
parser->error = error;
otl_longjmp( parser->jump_buffer, 1 );
}
#define OTL_PARSER_UNCOVERED(x) otl_parser_error( x, OTL_Parse_Err_UncoveredGlyph );
OTL_LOCAL( void )
otl_parser_check_property( OTL_Parser parser,
OTL_UInt gindex,
OTL_UInt flags,
OTL_UInt *aproperty );
OTL_LOCALDEF( void )
otl_parser_replace_1( OTL_Parser parser,
OTL_UInt gindex )
{
OTL_String in = parser->str_in;
OTL_String out = parser->str_out;
OTL_StringGlyph glyph, in_glyph;
/* sanity check */
if ( in == NULL ||
out == NULL ||
in->length == 0 ||
in->cursor >= in->length )
{
/* report as internal error, since these should */
/* never happen !! */
otl_parser_error( parser, OTL_Err_Parse_Internal );
}
OTL_STRING_ENSURE( out, 1, parser );
glyph = out->glyphs + out->length;
in_glyph = in->glyphs + in->cursor;
glyph->gindex = gindex;
glyph->property = in_glyph->property;
glyph->lig_component = in_glyph->lig_component;
glyph->lig_id = in_glyph->lig_id;
out->length += 1;
out->cursor = out->length;
in->cursor += 1;
}
OTL_LOCALDEF( void )
otl_parser_replace_n( OTL_Parser parser,
OTL_UInt count,
OTL_Bytes indices )
{
OTL_UInt lig_component, lig_id, property;
OTL_String in = parser->str_in;
OTL_String out = parser->str_out;
OTL_StringGlyph glyph, in_glyph;
OTL_Bytes p = indices;
/* sanity check */
if ( in == NULL ||
out == NULL ||
in->length == 0 ||
in->cursor >= in->length )
{
/* report as internal error, since these should */
/* never happen !! */
otl_parser_error( parser, OTL_Err_Parse_Internal );
}
OTL_STRING_ENSURE( out, count, parser );
glyph = out->glyphs + out->length;
in_glyph = in->glyphs + in->cursor;
glyph->gindex = gindex;
lig_component = in_glyph->lig_component;
lig_id = in_glyph->lid_id;
property = in_glyph->property;
for ( ; count > 0; count-- )
{
glyph->gindex = OTL_NEXT_USHORT(p);
glyph->property = property;
glyph->lig_component = lig_component;
glyph->lig_id = lig_id;
out->length ++;
}
out->cursor = out->length;
in->cursor += 1;
}

99
src/otlayout/otlparse.h Normal file
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@ -0,0 +1,99 @@
#ifndef __OTL_PARSER_H__
#define __OTL_PARSER_H__
#include "otlayout.h"
#include "otlgdef.h"
#include "otlgsub.h"
#include "otlgpos.h"
OTL_BEGIN_HEADER
typedef struct OTL_ParserRec_* OTL_Parser;
typedef struct OTL_StringRec_* OTL_String;
typedef struct OTL_StringGlyphRec_
{
OTL_UInt gindex;
OTL_UInt properties;
OTL_UInt lig_component;
OTL_UInt lig_id;
} OTL_StringGlyphRec, *OTL_StringGlyph;
typedef struct OTL_StringRec_
{
OTL_StringGlyph glyphs;
OTL_UInt cursor;
OTL_UInt length;
OTL_UInt capacity;
} OTL_StringRec;
typedef struct OTL_ParserRec_
{
OTL_Bytes tab_gdef;
OTL_Bytes tab_gsub;
OTL_Bytes tab_gpos;
OTL_Bytes tab_base;
OTL_Bytes tab_jstf;
OTL_Alternate alternate; /* external alternate handler */
OTL_UInt context_len;
OTL_UInt markup_flags;
OTL_jmp_buf jump_buffer;
OTL_Memory memory;
OTL_Error error;
OTL_StringRec strings[2];
OTL_String str_in;
OTL_String str_out;
} OTL_ParserRec;
typedef enum
{
OTL_Err_Parser_Ok = 0,
OTL_Err_Parser_InvalidData,
OTL_Err_Parser_UncoveredGlyph
} OTL_ParseError;
OTL_LOCAL( OTL_UInt )
otl_parser_get_gindex( OTL_Parser parser );
OTL_LOCAL( void )
otl_parser_error( OTL_Parser parser, OTL_ParserError error );
#define OTL_PARSER_UNCOVERED(x) \
otl_parser_error( x, OTL_Err_Parser_UncoveredGlyph )
OTL_LOCAL( void )
otl_parser_check_property( OTL_Parser parser,
OTL_UInt gindex,
OTL_UInt flags,
OTL_UInt *aproperty );
/* copy current input glyph to output */
OTL_LOCAL( void )
otl_parser_copy_1( OTL_Parser parser );
/* copy current input glyph to output, replacing its index */
OTL_LOCAL( void )
otl_parser_replace_1( OTL_Parser parser,
OTL_UInt gindex );
/* copy current input glyph to output, replacing it by several indices */
/* read directly from the table */
OTL_LOCAL( void )
otl_parser_replace_n( OTL_Parser parser,
OTL_UInt count,
OTL_Bytes indices );
OTL_END_HEADER
#endif /* __OTL_PARSER_H__ */

33
src/otlayout/otlutils.h Normal file
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@ -0,0 +1,33 @@
#ifndef __OTLAYOUT_UTILS_H__
#define __OTLAYOUT_UTILS_H__
#include "otlayout.h"
OTL_BEGIN_HEADER
OTL_LOCAL( OTL_Error )
otl_mem_alloc( OTL_Pointer* pblock,
OTL_ULong size,
OTL_Memory memory );
OTL_LOCAL( void )
otl_mem_free( OTL_Pointer* pblock,
OTL_Memory memory );
OTL_LOCAL( OTL_Error )
otl_mem_realloc( OTL_Pointer *pblock,
OTL_ULong cur_size,
OTL_ULong new_size,
OTL_Memory memory );
#define OTL_MEM_ALLOC(p,s) otl_mem_alloc( (void**)&(p), (s), memory )
#define OTL_MEM_FREE(p) otl_mem_free( (void**)&(p), memory )
#define OTL_MEM_REALLOC(p,c,n) otl_mem_realloc( (void**)&(p), (c), (s), memory )
#define OTL_MEM_NEW(p) OTL_MEM_ALLOC(p,sizeof(*(p)))
#define OTL_MEM_NEW_ARRAY(p,c) OTL_MEM_ALLOC(p,(c)*sizeof(*(p)))
#define OTL_MEM_RENEW_ARRAY(p,c,n) OTL_MEM_REALLOC(p,(c)*sizeof(*(p)),(n)*sizeof(*(p)))
OTL_END_HEADER
#endif /* __OTLAYOUT_UTILS_H__ */