6aa260ce61
we still need to determine the list of "trick" CJK fonts that are going to toggle the bytecode interpreter instead of the auto-hinter
749 lines
22 KiB
C
749 lines
22 KiB
C
/***************************************************************************/
|
|
/* */
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|
/* ttpload.c */
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|
/* */
|
|
/* TrueType-specific tables loader (body). */
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/* */
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/* Copyright 1996-2001, 2002, 2004, 2005, 2006 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#include <ft2build.h>
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#include FT_INTERNAL_DEBUG_H
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#include FT_INTERNAL_OBJECTS_H
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#include FT_INTERNAL_STREAM_H
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#include FT_TRUETYPE_TAGS_H
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|
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#include "ttpload.h"
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|
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#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
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#include "ttgxvar.h"
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#endif
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#include "tterrors.h"
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|
|
|
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|
/*************************************************************************/
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|
/* */
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|
/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
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/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
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/* messages during execution. */
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/* */
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_ttpload
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|
|
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/*************************************************************************/
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/* */
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/* <Function> */
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|
/* tt_face_load_loca */
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|
/* */
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|
/* <Description> */
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|
/* Load the locations table. */
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|
/* */
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|
/* <InOut> */
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|
/* face :: A handle to the target face object. */
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|
/* */
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|
/* <Input> */
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/* stream :: The input stream. */
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|
/* */
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/* <Return> */
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|
/* FreeType error code. 0 means success. */
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/* */
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|
#ifdef FT_OPTIMIZE_MEMORY
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|
|
|
FT_LOCAL_DEF( FT_Error )
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|
tt_face_load_loca( TT_Face face,
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|
FT_Stream stream )
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|
{
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|
FT_Error error;
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|
FT_ULong table_len;
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|
|
|
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|
/* we need the size of the `glyf' table for malformed `loca' tables */
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error = face->goto_table( face, TTAG_glyf, stream, &face->glyf_len );
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if ( error )
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|
goto Exit;
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|
|
|
FT_TRACE2(( "Locations " ));
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|
error = face->goto_table( face, TTAG_loca, stream, &table_len );
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|
if ( error )
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|
{
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error = TT_Err_Locations_Missing;
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|
goto Exit;
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|
}
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|
|
|
if ( face->header.Index_To_Loc_Format != 0 )
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|
{
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|
if ( table_len >= 0x40000L )
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|
{
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|
FT_TRACE2(( "table too large!\n" ));
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error = TT_Err_Invalid_Table;
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|
goto Exit;
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|
}
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|
face->num_locations = (FT_UInt)( table_len >> 2 );
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|
}
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|
else
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|
{
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|
if ( table_len >= 0x20000L )
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{
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|
FT_TRACE2(( "table too large!\n" ));
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error = TT_Err_Invalid_Table;
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|
goto Exit;
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|
}
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|
face->num_locations = (FT_UInt)( table_len >> 1 );
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|
}
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|
|
|
/*
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|
* Extract the frame. We don't need to decompress it since
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|
* we are able to parse it directly.
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|
*/
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if ( FT_FRAME_EXTRACT( table_len, face->glyph_locations ) )
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|
goto Exit;
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|
|
|
FT_TRACE2(( "loaded\n" ));
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|
|
|
Exit:
|
|
return error;
|
|
}
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|
|
|
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|
FT_LOCAL_DEF( FT_ULong )
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|
tt_face_get_location( TT_Face face,
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|
FT_UInt gindex,
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|
FT_UInt *asize )
|
|
{
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|
FT_ULong pos1, pos2;
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|
FT_Byte* p;
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|
FT_Byte* p_limit;
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|
|
|
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pos1 = pos2 = 0;
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|
|
|
if ( gindex < face->num_locations )
|
|
{
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|
if ( face->header.Index_To_Loc_Format != 0 )
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|
{
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|
p = face->glyph_locations + gindex * 4;
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p_limit = face->glyph_locations + face->num_locations * 4;
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|
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pos1 = FT_NEXT_ULONG( p );
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|
pos2 = pos1;
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|
|
|
if ( p + 4 <= p_limit )
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|
pos2 = FT_NEXT_ULONG( p );
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|
}
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|
else
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|
{
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|
p = face->glyph_locations + gindex * 2;
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p_limit = face->glyph_locations + face->num_locations * 2;
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|
|
|
pos1 = FT_NEXT_USHORT( p );
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pos2 = pos1;
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|
|
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if ( p + 2 <= p_limit )
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pos2 = FT_NEXT_USHORT( p );
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|
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pos1 <<= 1;
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pos2 <<= 1;
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|
}
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|
}
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|
|
|
/* It isn't mentioned explicitly that the `loca' table must be */
|
|
/* ordered, but implicitly it refers to the length of an entry */
|
|
/* as the difference between the current and the next position. */
|
|
/* Anyway, there do exist (malformed) fonts which don't obey */
|
|
/* this rule, so we are only able to provide an upper bound for */
|
|
/* the size. */
|
|
if ( pos2 >= pos1 )
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|
*asize = (FT_UInt)( pos2 - pos1 );
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|
else
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*asize = (FT_UInt)( face->glyf_len - pos1 );
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return pos1;
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|
}
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|
|
|
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FT_LOCAL_DEF( void )
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|
tt_face_done_loca( TT_Face face )
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|
{
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|
FT_Stream stream = face->root.stream;
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|
|
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FT_FRAME_RELEASE( face->glyph_locations );
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face->num_locations = 0;
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}
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|
|
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#else /* !FT_OPTIMIZE_MEMORY */
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FT_LOCAL_DEF( FT_Error )
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tt_face_load_loca( TT_Face face,
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FT_Stream stream )
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{
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|
FT_Error error;
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|
FT_Memory memory = stream->memory;
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|
FT_Short LongOffsets;
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FT_ULong table_len;
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|
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/* we need the size of the `glyf' table for malformed `loca' tables */
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error = face->goto_table( face, TTAG_glyf, stream, &face->glyf_len );
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if ( error )
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goto Exit;
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|
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FT_TRACE2(( "Locations " ));
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LongOffsets = face->header.Index_To_Loc_Format;
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error = face->goto_table( face, TTAG_loca, stream, &table_len );
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if ( error )
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{
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error = TT_Err_Locations_Missing;
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goto Exit;
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|
}
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if ( LongOffsets != 0 )
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{
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face->num_locations = (FT_UShort)( table_len >> 2 );
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FT_TRACE2(( "(32bit offsets): %12d ", face->num_locations ));
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if ( FT_NEW_ARRAY( face->glyph_locations, face->num_locations ) )
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goto Exit;
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if ( FT_FRAME_ENTER( face->num_locations * 4L ) )
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goto Exit;
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|
{
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FT_Long* loc = face->glyph_locations;
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FT_Long* limit = loc + face->num_locations;
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|
|
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for ( ; loc < limit; loc++ )
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*loc = FT_GET_LONG();
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|
}
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FT_FRAME_EXIT();
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|
}
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else
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{
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face->num_locations = (FT_UShort)( table_len >> 1 );
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FT_TRACE2(( "(16bit offsets): %12d ", face->num_locations ));
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|
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|
if ( FT_NEW_ARRAY( face->glyph_locations, face->num_locations ) )
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goto Exit;
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if ( FT_FRAME_ENTER( face->num_locations * 2L ) )
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goto Exit;
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|
|
|
{
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|
FT_Long* loc = face->glyph_locations;
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FT_Long* limit = loc + face->num_locations;
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for ( ; loc < limit; loc++ )
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*loc = (FT_Long)( (FT_ULong)FT_GET_USHORT() * 2 );
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}
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FT_FRAME_EXIT();
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}
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FT_TRACE2(( "loaded\n" ));
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Exit:
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|
return error;
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}
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FT_LOCAL_DEF( FT_ULong )
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tt_face_get_location( TT_Face face,
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FT_UInt gindex,
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FT_UInt *asize )
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{
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FT_ULong offset;
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FT_UInt count;
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offset = face->glyph_locations[gindex];
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count = 0;
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if ( gindex < (FT_UInt)face->num_locations - 1 )
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{
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FT_ULong offset1 = face->glyph_locations[gindex + 1];
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|
|
|
|
/* It isn't mentioned explicitly that the `loca' table must be */
|
|
/* ordered, but implicitly it refers to the length of an entry */
|
|
/* as the difference between the current and the next position. */
|
|
/* Anyway, there do exist (malformed) fonts which don't obey */
|
|
/* this rule, so we are only able to provide an upper bound for */
|
|
/* the size. */
|
|
if ( offset1 >= offset )
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count = (FT_UInt)( offset1 - offset );
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else
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count = (FT_UInt)( face->glyf_len - offset );
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}
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*asize = count;
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return offset;
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}
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|
|
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FT_LOCAL_DEF( void )
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tt_face_done_loca( TT_Face face )
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|
{
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|
FT_Memory memory = face->root.memory;
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|
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FT_FREE( face->glyph_locations );
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face->num_locations = 0;
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}
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|
|
|
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|
#endif /* !FT_OPTIMIZE_MEMORY */
|
|
|
|
|
|
/*************************************************************************/
|
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/* */
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|
/* <Function> */
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/* tt_face_load_cvt */
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/* */
|
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/* <Description> */
|
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/* Load the control value table into a face object. */
|
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/* */
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|
/* <InOut> */
|
|
/* face :: A handle to the target face object. */
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|
/* */
|
|
/* <Input> */
|
|
/* stream :: A handle to the input stream. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
FT_LOCAL_DEF( FT_Error )
|
|
tt_face_load_cvt( TT_Face face,
|
|
FT_Stream stream )
|
|
{
|
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#ifdef TT_USE_BYTECODE_INTERPRETER
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|
|
|
FT_Error error;
|
|
FT_Memory memory = stream->memory;
|
|
FT_ULong table_len;
|
|
|
|
|
|
FT_TRACE2(( "CVT " ));
|
|
|
|
error = face->goto_table( face, TTAG_cvt, stream, &table_len );
|
|
if ( error )
|
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{
|
|
FT_TRACE2(( "is missing!\n" ));
|
|
|
|
face->cvt_size = 0;
|
|
face->cvt = NULL;
|
|
error = TT_Err_Ok;
|
|
|
|
goto Exit;
|
|
}
|
|
|
|
face->cvt_size = table_len / 2;
|
|
|
|
if ( FT_NEW_ARRAY( face->cvt, face->cvt_size ) )
|
|
goto Exit;
|
|
|
|
if ( FT_FRAME_ENTER( face->cvt_size * 2L ) )
|
|
goto Exit;
|
|
|
|
{
|
|
FT_Short* cur = face->cvt;
|
|
FT_Short* limit = cur + face->cvt_size;
|
|
|
|
|
|
for ( ; cur < limit; cur++ )
|
|
*cur = FT_GET_SHORT();
|
|
}
|
|
|
|
FT_FRAME_EXIT();
|
|
FT_TRACE2(( "loaded\n" ));
|
|
|
|
#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
|
|
if ( face->doblend )
|
|
error = tt_face_vary_cvt( face, stream );
|
|
#endif
|
|
|
|
Exit:
|
|
return error;
|
|
|
|
#else /* !TT_USE_BYTECODE_INTERPRETER */
|
|
|
|
FT_UNUSED( face );
|
|
FT_UNUSED( stream );
|
|
|
|
return TT_Err_Ok;
|
|
|
|
#endif
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* tt_face_load_fpgm */
|
|
/* */
|
|
/* <Description> */
|
|
/* Load the font program. */
|
|
/* */
|
|
/* <InOut> */
|
|
/* face :: A handle to the target face object. */
|
|
/* */
|
|
/* <Input> */
|
|
/* stream :: A handle to the input stream. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
FT_LOCAL_DEF( FT_Error )
|
|
tt_face_load_fpgm( TT_Face face,
|
|
FT_Stream stream )
|
|
{
|
|
#ifdef TT_USE_BYTECODE_INTERPRETER
|
|
|
|
FT_Error error;
|
|
FT_ULong table_len;
|
|
|
|
|
|
FT_TRACE2(( "Font program " ));
|
|
|
|
/* The font program is optional */
|
|
error = face->goto_table( face, TTAG_fpgm, stream, &table_len );
|
|
if ( error )
|
|
{
|
|
face->font_program = NULL;
|
|
face->font_program_size = 0;
|
|
error = TT_Err_Ok;
|
|
|
|
FT_TRACE2(( "is missing!\n" ));
|
|
}
|
|
else
|
|
{
|
|
face->font_program_size = table_len;
|
|
if ( FT_FRAME_EXTRACT( table_len, face->font_program ) )
|
|
goto Exit;
|
|
|
|
FT_TRACE2(( "loaded, %12d bytes\n", face->font_program_size ));
|
|
}
|
|
|
|
Exit:
|
|
return error;
|
|
|
|
#else /* !TT_USE_BYTECODE_INTERPRETER */
|
|
|
|
FT_UNUSED( face );
|
|
FT_UNUSED( stream );
|
|
|
|
return TT_Err_Ok;
|
|
|
|
#endif
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* tt_face_load_prep */
|
|
/* */
|
|
/* <Description> */
|
|
/* Load the cvt program. */
|
|
/* */
|
|
/* <InOut> */
|
|
/* face :: A handle to the target face object. */
|
|
/* */
|
|
/* <Input> */
|
|
/* stream :: A handle to the input stream. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
FT_LOCAL_DEF( FT_Error )
|
|
tt_face_load_prep( TT_Face face,
|
|
FT_Stream stream )
|
|
{
|
|
#ifdef TT_USE_BYTECODE_INTERPRETER
|
|
|
|
FT_Error error;
|
|
FT_ULong table_len;
|
|
|
|
|
|
FT_TRACE2(( "Prep program " ));
|
|
|
|
error = face->goto_table( face, TTAG_prep, stream, &table_len );
|
|
if ( error )
|
|
{
|
|
face->cvt_program = NULL;
|
|
face->cvt_program_size = 0;
|
|
error = TT_Err_Ok;
|
|
|
|
FT_TRACE2(( "is missing!\n" ));
|
|
}
|
|
else
|
|
{
|
|
face->cvt_program_size = table_len;
|
|
if ( FT_FRAME_EXTRACT( table_len, face->cvt_program ) )
|
|
goto Exit;
|
|
|
|
FT_TRACE2(( "loaded, %12d bytes\n", face->cvt_program_size ));
|
|
}
|
|
|
|
Exit:
|
|
return error;
|
|
|
|
#else /* !TT_USE_BYTECODE_INTERPRETER */
|
|
|
|
FT_UNUSED( face );
|
|
FT_UNUSED( stream );
|
|
|
|
return TT_Err_Ok;
|
|
|
|
#endif
|
|
}
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* tt_face_load_hdmx */
|
|
/* */
|
|
/* <Description> */
|
|
/* Load the `hdmx' table into the face object. */
|
|
/* */
|
|
/* <Input> */
|
|
/* face :: A handle to the target face object. */
|
|
/* */
|
|
/* stream :: A handle to the input stream. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
#ifdef FT_OPTIMIZE_MEMORY
|
|
|
|
FT_LOCAL_DEF( FT_Error )
|
|
tt_face_load_hdmx( TT_Face face,
|
|
FT_Stream stream )
|
|
{
|
|
FT_Error error;
|
|
FT_Memory memory = stream->memory;
|
|
FT_UInt version, nn, num_records;
|
|
FT_ULong table_size, record_size;
|
|
FT_Byte* p;
|
|
FT_Byte* limit;
|
|
|
|
|
|
/* this table is optional */
|
|
error = face->goto_table( face, TTAG_hdmx, stream, &table_size );
|
|
if ( error || table_size < 8 )
|
|
return TT_Err_Ok;
|
|
|
|
if ( FT_FRAME_EXTRACT( table_size, face->hdmx_table ) )
|
|
goto Exit;
|
|
|
|
p = face->hdmx_table;
|
|
limit = p + table_size;
|
|
|
|
version = FT_NEXT_USHORT( p );
|
|
num_records = FT_NEXT_USHORT( p );
|
|
record_size = FT_NEXT_ULONG( p );
|
|
|
|
if ( version != 0 || num_records > 255 || record_size > 0x40000 )
|
|
{
|
|
error = TT_Err_Invalid_File_Format;
|
|
goto Fail;
|
|
}
|
|
|
|
if ( FT_NEW_ARRAY( face->hdmx_record_sizes, num_records ) )
|
|
goto Fail;
|
|
|
|
for ( nn = 0; nn < num_records; nn++ )
|
|
{
|
|
if ( p + record_size > limit )
|
|
break;
|
|
|
|
face->hdmx_record_sizes[nn] = p[0];
|
|
p += record_size;
|
|
}
|
|
|
|
face->hdmx_record_count = nn;
|
|
face->hdmx_table_size = table_size;
|
|
face->hdmx_record_size = record_size;
|
|
|
|
Exit:
|
|
return error;
|
|
|
|
Fail:
|
|
FT_FRAME_RELEASE( face->hdmx_table );
|
|
face->hdmx_table_size = 0;
|
|
goto Exit;
|
|
}
|
|
|
|
|
|
FT_LOCAL_DEF( void )
|
|
tt_face_free_hdmx( TT_Face face )
|
|
{
|
|
FT_Stream stream = face->root.stream;
|
|
FT_Memory memory = stream->memory;
|
|
|
|
|
|
FT_FREE( face->hdmx_record_sizes );
|
|
FT_FRAME_RELEASE( face->hdmx_table );
|
|
}
|
|
|
|
#else /* !FT_OPTIMIZE_MEMORY */
|
|
|
|
FT_LOCAL_DEF( FT_Error )
|
|
tt_face_load_hdmx( TT_Face face,
|
|
FT_Stream stream )
|
|
{
|
|
FT_Error error;
|
|
FT_Memory memory = stream->memory;
|
|
|
|
TT_Hdmx hdmx = &face->hdmx;
|
|
FT_Short num_records;
|
|
FT_Long num_glyphs;
|
|
FT_Long record_size;
|
|
|
|
|
|
hdmx->version = 0;
|
|
hdmx->num_records = 0;
|
|
hdmx->records = 0;
|
|
|
|
/* this table is optional */
|
|
error = face->goto_table( face, TTAG_hdmx, stream, 0 );
|
|
if ( error )
|
|
return TT_Err_Ok;
|
|
|
|
if ( FT_FRAME_ENTER( 8L ) )
|
|
goto Exit;
|
|
|
|
hdmx->version = FT_GET_USHORT();
|
|
num_records = FT_GET_SHORT();
|
|
record_size = FT_GET_LONG();
|
|
|
|
FT_FRAME_EXIT();
|
|
|
|
if ( record_size < 0 || num_records < 0 )
|
|
return TT_Err_Invalid_File_Format;
|
|
|
|
/* Only recognize format 0 */
|
|
if ( hdmx->version != 0 )
|
|
goto Exit;
|
|
|
|
/* we can't use FT_QNEW_ARRAY here; otherwise tt_face_free_hdmx */
|
|
/* could fail during deallocation */
|
|
if ( FT_NEW_ARRAY( hdmx->records, num_records ) )
|
|
goto Exit;
|
|
|
|
hdmx->num_records = num_records;
|
|
num_glyphs = face->root.num_glyphs;
|
|
record_size -= num_glyphs + 2;
|
|
|
|
{
|
|
TT_HdmxEntry cur = hdmx->records;
|
|
TT_HdmxEntry limit = cur + hdmx->num_records;
|
|
|
|
|
|
for ( ; cur < limit; cur++ )
|
|
{
|
|
/* read record */
|
|
if ( FT_READ_BYTE( cur->ppem ) ||
|
|
FT_READ_BYTE( cur->max_width ) )
|
|
goto Exit;
|
|
|
|
if ( FT_QALLOC( cur->widths, num_glyphs ) ||
|
|
FT_STREAM_READ( cur->widths, num_glyphs ) )
|
|
goto Exit;
|
|
|
|
/* skip padding bytes */
|
|
if ( record_size > 0 && FT_STREAM_SKIP( record_size ) )
|
|
goto Exit;
|
|
}
|
|
}
|
|
|
|
Exit:
|
|
return error;
|
|
}
|
|
|
|
|
|
FT_LOCAL_DEF( void )
|
|
tt_face_free_hdmx( TT_Face face )
|
|
{
|
|
if ( face )
|
|
{
|
|
FT_Int n;
|
|
FT_Memory memory = face->root.driver->root.memory;
|
|
|
|
|
|
for ( n = 0; n < face->hdmx.num_records; n++ )
|
|
FT_FREE( face->hdmx.records[n].widths );
|
|
|
|
FT_FREE( face->hdmx.records );
|
|
face->hdmx.num_records = 0;
|
|
}
|
|
}
|
|
|
|
#endif /* !OPTIMIZE_MEMORY */
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* Return the advance width table for a given pixel size if it is found */
|
|
/* in the font's `hdmx' table (if any). */
|
|
/* */
|
|
FT_LOCAL_DEF( FT_Byte* )
|
|
tt_face_get_device_metrics( TT_Face face,
|
|
FT_UInt ppem,
|
|
FT_UInt gindex )
|
|
{
|
|
#ifdef FT_OPTIMIZE_MEMORY
|
|
|
|
FT_UInt nn;
|
|
FT_Byte* result = NULL;
|
|
FT_ULong record_size = face->hdmx_record_size;
|
|
FT_Byte* record = face->hdmx_table + 8;
|
|
|
|
|
|
for ( nn = 0; nn < face->hdmx_record_count; nn++ )
|
|
if ( face->hdmx_record_sizes[nn] == ppem )
|
|
{
|
|
gindex += 2;
|
|
if ( gindex < record_size )
|
|
result = record + nn * record_size + gindex;
|
|
break;
|
|
}
|
|
|
|
return result;
|
|
|
|
#else
|
|
|
|
FT_UShort n;
|
|
|
|
|
|
for ( n = 0; n < face->hdmx.num_records; n++ )
|
|
if ( face->hdmx.records[n].ppem == ppem )
|
|
return &face->hdmx.records[n].widths[gindex];
|
|
|
|
return NULL;
|
|
|
|
#endif
|
|
}
|
|
|
|
|
|
/* END */
|