ref: 65d328ead72f934c98243a0da5cfd70b9424e5bf
dir: /src/sfnt/sfobjs.c/
/***************************************************************************/
/* */
/* sfobjs.c */
/* */
/* SFNT object management (base). */
/* */
/* Copyright 1996-2000 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 <ft2build.h>
#include FT_SOURCE_FILE(sfnt,sfobjs.h)
#include FT_SOURCE_FILE(sfnt,ttload.h)
#include FT_INTERNAL_SFNT_H
#include FT_INTERNAL_POSTSCRIPT_NAMES_H
#include FT_TRUETYPE_NAMES_H
#include FT_TRUETYPE_TAGS_H
#include FT_INTERNAL_TRUETYPE_ERRORS_H
/*************************************************************************/
/* */
/* 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_sfobjs
/*************************************************************************/
/* */
/* <Function> */
/* Get_Name */
/* */
/* <Description> */
/* Returns a given ENGLISH name record in ASCII. */
/* */
/* <Input> */
/* face :: A handle to the source face object. */
/* */
/* nameid :: The name id of the name record to return. */
/* */
/* <Return> */
/* Character string. NULL if no name is present. */
/* */
static
FT_String* Get_Name( TT_Face face,
FT_UShort nameid )
{
FT_Memory memory = face->root.memory;
FT_UShort n;
TT_NameRec* rec;
FT_Bool wide_chars = 1;
rec = face->name_table.names;
for ( n = 0; n < face->name_table.numNameRecords; n++, rec++ )
{
if ( rec->nameID == nameid )
{
/* found the name -- now create an ASCII string from it */
FT_Bool found = 0;
/* test for Microsoft English language */
if ( rec->platformID == TT_PLATFORM_MICROSOFT &&
rec->encodingID <= TT_MS_ID_UNICODE_CS &&
( rec->languageID & 0x3FF ) == 0x009 )
found = 1;
/* test for Apple Unicode encoding */
else if ( rec->platformID == TT_PLATFORM_APPLE_UNICODE )
found = 1;
/* test for Apple Roman */
else if ( rec->platformID == TT_PLATFORM_MACINTOSH &&
rec->languageID == TT_MAC_ID_ROMAN )
{
found = 1;
wide_chars = 0;
}
/* found a Unicode name */
if ( found )
{
FT_String* string;
FT_UInt len;
if ( wide_chars )
{
FT_UInt m;
len = (FT_UInt)rec->stringLength / 2;
if ( MEM_Alloc( string, len + 1 ) )
return NULL;
for ( m = 0; m < len; m ++ )
string[m] = rec->string[2 * m + 1];
}
else
{
len = rec->stringLength;
if ( MEM_Alloc( string, len + 1 ) )
return NULL;
MEM_Copy( string, rec->string, len );
}
string[len] = '\0';
return string;
}
}
}
return NULL;
}
static
FT_Encoding find_encoding( int platform_id,
int encoding_id )
{
typedef struct TEncoding
{
int platform_id;
int encoding_id;
FT_Encoding encoding;
} TEncoding;
static
const TEncoding tt_encodings[] =
{
{ TT_PLATFORM_ISO, -1, ft_encoding_unicode },
{ TT_PLATFORM_APPLE_UNICODE, -1, ft_encoding_unicode },
{ TT_PLATFORM_MACINTOSH, TT_MAC_ID_ROMAN, ft_encoding_apple_roman },
{ TT_PLATFORM_MICROSOFT, TT_MS_ID_SYMBOL_CS, ft_encoding_symbol },
{ TT_PLATFORM_MICROSOFT, TT_MS_ID_UNICODE_CS, ft_encoding_unicode },
{ TT_PLATFORM_MICROSOFT, TT_MS_ID_SJIS, ft_encoding_sjis },
{ TT_PLATFORM_MICROSOFT, TT_MS_ID_GB2312, ft_encoding_gb2312 },
{ TT_PLATFORM_MICROSOFT, TT_MS_ID_BIG_5, ft_encoding_big5 },
{ TT_PLATFORM_MICROSOFT, TT_MS_ID_WANSUNG, ft_encoding_wansung },
{ TT_PLATFORM_MICROSOFT, TT_MS_ID_JOHAB, ft_encoding_johab }
};
const TEncoding *cur, *limit;
cur = tt_encodings;
limit = cur + sizeof ( tt_encodings ) / sizeof ( tt_encodings[0] );
for ( ; cur < limit; cur++ )
{
if ( cur->platform_id == platform_id )
{
if ( cur->encoding_id == encoding_id ||
cur->encoding_id == -1 )
return cur->encoding;
}
}
return ft_encoding_none;
}
FT_LOCAL_DEF
FT_Error SFNT_Init_Face( FT_Stream stream,
TT_Face face,
FT_Int face_index,
FT_Int num_params,
FT_Parameter* params )
{
FT_Error error;
FT_Library library = face->root.driver->root.library;
SFNT_Interface* sfnt;
SFNT_Header sfnt_header;
/* for now, parameters are unused */
FT_UNUSED( num_params );
FT_UNUSED( params );
sfnt = (SFNT_Interface*)face->sfnt;
if ( !sfnt )
{
sfnt = (SFNT_Interface*)FT_Get_Module_Interface( library, "sfnt" );
if ( !sfnt )
{
error = FT_Err_Invalid_File_Format;
goto Exit;
}
face->sfnt = sfnt;
face->goto_table = sfnt->goto_table;
}
if ( !face->psnames )
{
face->psnames = (PSNames_Interface*)
FT_Get_Module_Interface( library, "psnames" );
}
/* check that we have a valid TrueType file */
error = sfnt->load_sfnt_header( face, stream, face_index, &sfnt_header );
if ( error )
goto Exit;
face->format_tag = sfnt_header.format_tag;
face->num_tables = sfnt_header.num_tables;
/* Load font directory */
error = sfnt->load_directory( face, stream, &sfnt_header );
if ( error )
goto Exit;
face->root.num_faces = face->ttc_header.count;
if ( face->root.num_faces < 1 )
face->root.num_faces = 1;
Exit:
return error;
}
#undef LOAD_
#define LOAD_( x ) ( ( error = sfnt->load_##x( face, stream ) ) \
!= TT_Err_Ok )
FT_LOCAL_DEF
FT_Error SFNT_Load_Face( FT_Stream stream,
TT_Face face,
FT_Int face_index,
FT_Int num_params,
FT_Parameter* params )
{
FT_Error error;
FT_Bool has_outline;
FT_Bool is_apple_sbit;
SFNT_Interface* sfnt = (SFNT_Interface*)face->sfnt;
FT_UNUSED( face_index );
FT_UNUSED( num_params );
FT_UNUSED( params );
/* Load tables */
/* We now support two SFNT-based bitmapped font formats. They */
/* are recognized easily as they do not include a `glyf' */
/* table. */
/* */
/* The first format comes from Apple, and uses a table named */
/* `bhed' instead of `head' to store the font header (using */
/* the same format). It also doesn't include horizontal and */
/* vertical metrics tables (i.e. `hhea' and `vhea' tables are */
/* missing). */
/* */
/* The other format comes from Microsoft, and is used with */
/* WinCE/PocketPC. It looks like a standard TTF, except that */
/* it doesn't contain outlines. */
/* */
/* do we have outlines in there? */
has_outline = ( ( TT_LookUp_Table( face, TTAG_glyf ) != 0 ) ||
( TT_LookUp_Table( face, TTAG_CFF ) != 0 ) );
is_apple_sbit = 0;
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
/* if this font doesn't contain outlines, we try to load */
/* a `bhed' table */
if ( !has_outline )
is_apple_sbit = !LOAD_( bitmap_header );
#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
/* load the font header (`head' table) if this isn't an Apple */
/* sbit font file */
if ( !is_apple_sbit && LOAD_( header ) )
goto Exit;
/* load other tables */
if ( LOAD_( max_profile ) ||
LOAD_( charmaps ) ||
LOAD_( names ) ||
LOAD_( psnames ) )
goto Exit;
/* do not load the metrics headers and tables if this is an Apple */
/* sbit font file */
if ( !is_apple_sbit )
{
/* load the `hhea' and `hmtx' tables at once */
error = sfnt->load_metrics( face, stream, 0 );
if ( error )
goto Exit;
/* try to load the `vhea' and `vmtx' tables at once */
error = sfnt->load_metrics( face, stream, 1 );
if ( error )
goto Exit;
if ( LOAD_( os2 ) )
goto Exit;
}
/* the optional tables */
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
/* embedded bitmap support. */
if ( sfnt->load_sbits && LOAD_( sbits ) )
{
/* return an error if this font file has no outlines */
if ( error == TT_Err_Table_Missing && has_outline )
error = FT_Err_Ok;
else
goto Exit;
}
#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
if ( LOAD_( hdmx ) ||
LOAD_( gasp ) ||
LOAD_( kerning ) ||
LOAD_( pclt ) )
goto Exit;
#ifdef TT_CONFIG_OPTION_EXTEND_ENGINE
if ( ( error = TT_Extension_Create( face ) ) != TT_Err_Ok )
goto Exit;
#endif
face->root.family_name = Get_Name( face, TT_NAME_ID_FONT_FAMILY );
face->root.style_name = Get_Name( face, TT_NAME_ID_FONT_SUBFAMILY );
/* now set up root fields */
{
FT_Face root = &face->root;
FT_Int flags = 0;
TT_CharMap charmap;
FT_Int n;
FT_Memory memory;
memory = root->memory;
/*********************************************************************/
/* */
/* Compute face flags. */
/* */
if ( has_outline == TRUE )
flags = FT_FACE_FLAG_SCALABLE; /* scalable outlines */
flags |= FT_FACE_FLAG_SFNT | /* SFNT file format */
FT_FACE_FLAG_HORIZONTAL; /* horizontal data */
#ifdef TT_CONFIG_OPTION_POSTSCRIPT_NAMES
/* might need more polish to detect the presence of a Postscript */
/* name table in the font */
flags |= FT_FACE_FLAG_GLYPH_NAMES;
#endif
/* fixed width font? */
if ( face->postscript.isFixedPitch )
flags |= FT_FACE_FLAG_FIXED_WIDTH;
/* vertical information? */
if ( face->vertical_info )
flags |= FT_FACE_FLAG_VERTICAL;
/* kerning available ? */
if ( face->kern_pairs )
flags |= FT_FACE_FLAG_KERNING;
root->face_flags = flags;
/*********************************************************************/
/* */
/* Compute style flags. */
/* */
flags = 0;
if ( has_outline == TRUE && face->os2.version != 0xFFFF )
{
/* we have an OS/2 table; use the `fsSelection' field */
if ( face->os2.fsSelection & 1 )
flags |= FT_STYLE_FLAG_ITALIC;
if ( face->os2.fsSelection & 32 )
flags |= FT_STYLE_FLAG_BOLD;
}
else
{
/* this is an old Mac font, use the header field */
if ( face->header.Mac_Style & 1 )
flags |= FT_STYLE_FLAG_BOLD;
if ( face->header.Mac_Style & 2 )
flags |= FT_STYLE_FLAG_ITALIC;
}
root->style_flags = flags;
/*********************************************************************/
/* */
/* Polish the charmaps. */
/* */
/* Try to set the charmap encoding according to the platform & */
/* encoding ID of each charmap. */
/* */
charmap = face->charmaps;
root->num_charmaps = face->num_charmaps;
/* allocate table of pointers */
if ( ALLOC_ARRAY( root->charmaps, root->num_charmaps, FT_CharMap ) )
goto Exit;
for ( n = 0; n < root->num_charmaps; n++, charmap++ )
{
FT_Int platform = charmap->cmap.platformID;
FT_Int encoding = charmap->cmap.platformEncodingID;
charmap->root.face = (FT_Face)face;
charmap->root.platform_id = platform;
charmap->root.encoding_id = encoding;
charmap->root.encoding = find_encoding( platform, encoding );
/* now, set root->charmap with a unicode charmap */
/* wherever available */
if ( !root->charmap &&
charmap->root.encoding == ft_encoding_unicode )
root->charmap = (FT_CharMap)charmap;
root->charmaps[n] = (FT_CharMap)charmap;
}
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
if ( face->num_sbit_strikes )
{
root->face_flags |= FT_FACE_FLAG_FIXED_SIZES;
#if 0
/* I don't know criteria whether layout is horizontal or vertical */
if ( has_outline.... )
{
...
root->face_flags |= FT_FACE_FLAG_VERTICAL;
}
#endif
root->num_fixed_sizes = face->num_sbit_strikes;
if ( ALLOC_ARRAY( root->available_sizes,
face->num_sbit_strikes,
FT_Bitmap_Size ) )
goto Exit;
for ( n = 0 ; n < face->num_sbit_strikes ; n++ )
{
root->available_sizes[n].width =
face->sbit_strikes[n].x_ppem;
root->available_sizes[n].height =
face->sbit_strikes[n].y_ppem;
}
}
else
#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
{
root->num_fixed_sizes = 0;
root->available_sizes = 0;
}
/*********************************************************************/
/* */
/* Set up metrics. */
/* */
if ( has_outline == TRUE )
{
/* XXX What about if outline header is missing */
/* (e.g. sfnt wrapped outline)? */
root->bbox.xMin = face->header.xMin;
root->bbox.yMin = face->header.yMin;
root->bbox.xMax = face->header.xMax;
root->bbox.yMax = face->header.yMax;
root->units_per_EM = face->header.Units_Per_EM;
/* XXX: Computing the ascender/descender/height is very different */
/* from what the specification tells you. Apparently, we */
/* must be careful because */
/* */
/* - not all fonts have an OS/2 table; in this case, we take */
/* the values in the horizontal header. However, these */
/* values very often are not reliable. */
/* */
/* - otherwise, the correct typographic values are in the */
/* sTypoAscender, sTypoDescender & sTypoLineGap fields. */
/* */
/* However, certains fonts have these fields set to 0. */
/* Rather, they have usWinAscent & usWinDescent correctly */
/* set (but with different values). */
/* */
/* As an example, Arial Narrow is implemented through four */
/* files ARIALN.TTF, ARIALNI.TTF, ARIALNB.TTF & ARIALNBI.TTF */
/* */
/* Strangely, all fonts have the same values in their */
/* sTypoXXX fields, except ARIALNB which sets them to 0. */
/* */
/* On the other hand, they all have different */
/* usWinAscent/Descent values -- as a conclusion, the OS/2 */
/* table cannot be used to compute the text height reliably! */
/* */
/* The ascender/descender/height are computed from the OS/2 table */
/* when found. Otherwise, they're taken from the horizontal */
/* header. */
/* */
root->ascender = face->horizontal.Ascender;
root->descender = face->horizontal.Descender;
root->height = root->ascender - root->descender +
face->horizontal.Line_Gap;
/* if the line_gap is 0, we add an extra 15% to the text height -- */
/* this computation is based on various versions of Times New Roman */
if ( face->horizontal.Line_Gap == 0 )
root->height = ( root->height * 115 + 50 ) / 100;
#if 0
/* some fonts have the OS/2 "sTypoAscender", "sTypoDescender" & */
/* "sTypoLineGap" fields set to 0, like ARIALNB.TTF */
if ( face->os2.version != 0xFFFF && root->ascender )
{
FT_Int height;
root->ascender = face->os2.sTypoAscender;
root->descender = -face->os2.sTypoDescender;
height = root->ascender + root->descender + face->os2.sTypoLineGap;
if ( height > root->height )
root->height = height;
}
#endif /* 0 */
root->max_advance_width = face->horizontal.advance_Width_Max;
root->max_advance_height = face->vertical_info
? face->vertical.advance_Height_Max
: root->height;
root->underline_position = face->postscript.underlinePosition;
root->underline_thickness = face->postscript.underlineThickness;
/* root->max_points -- already set up */
/* root->max_contours -- already set up */
}
}
Exit:
return error;
}
#undef LOAD_
FT_LOCAL_DEF
void SFNT_Done_Face( TT_Face face )
{
FT_Memory memory = face->root.memory;
SFNT_Interface* sfnt = (SFNT_Interface*)face->sfnt;
if ( sfnt )
{
/* destroy the postscript names table if it is loaded */
if ( sfnt->free_psnames )
sfnt->free_psnames( face );
/* destroy the embedded bitmaps table if it is loaded */
if ( sfnt->free_sbits )
sfnt->free_sbits( face );
}
/* freeing the kerning table */
FREE( face->kern_pairs );
face->num_kern_pairs = 0;
/* freeing the collection table */
FREE( face->ttc_header.offsets );
face->ttc_header.count = 0;
/* freeing table directory */
FREE( face->dir_tables );
face->num_tables = 0;
/* freeing the character mapping tables */
if ( sfnt && sfnt->load_charmaps )
{
FT_UShort n;
for ( n = 0; n < face->num_charmaps; n++ )
sfnt->free_charmap( face, &face->charmaps[n].cmap );
}
FREE( face->charmaps );
face->num_charmaps = 0;
FREE( face->root.charmaps );
face->root.num_charmaps = 0;
face->root.charmap = 0;
/* freeing the horizontal metrics */
FREE( face->horizontal.long_metrics );
FREE( face->horizontal.short_metrics );
/* freeing the vertical ones, if any */
if ( face->vertical_info )
{
FREE( face->vertical.long_metrics );
FREE( face->vertical.short_metrics );
face->vertical_info = 0;
}
/* freeing the gasp table */
FREE( face->gasp.gaspRanges );
face->gasp.numRanges = 0;
/* freeing the name table */
sfnt->free_names( face );
/* freeing the hdmx table */
sfnt->free_hdmx( face );
/* freeing family and style name */
FREE( face->root.family_name );
FREE( face->root.style_name );
/* freeing sbit size table */
face->root.num_fixed_sizes = 0;
if ( face->root.available_sizes )
FREE( face->root.available_sizes );
face->sfnt = 0;
}
/* END */