ref: ba80d61c7ab146002db3a851dca39e5a02fbb7aa
dir: /src/sfnt/ttload.c/
/***************************************************************************/
/* */
/* ttload.c */
/* */
/* Load the basic TrueType tables, i.e., tables that can be either in */
/* TTF or OTF fonts (body). */
/* */
/* Copyright 1996-2001, 2002, 2003, 2004 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_INTERNAL_DEBUG_H
#include FT_INTERNAL_STREAM_H
#include FT_TRUETYPE_TAGS_H
#include "ttload.h"
#include "sferrors.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_ttload
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_lookup_table */
/* */
/* <Description> */
/* Looks for a TrueType table by name. */
/* */
/* <Input> */
/* face :: A face object handle. */
/* */
/* tag :: The searched tag. */
/* */
/* <Return> */
/* A pointer to the table directory entry. 0 if not found. */
/* */
FT_LOCAL_DEF( TT_Table )
tt_face_lookup_table( TT_Face face,
FT_ULong tag )
{
TT_Table entry;
TT_Table limit;
FT_TRACE3(( "tt_face_lookup_table: %08p, `%c%c%c%c' -- ",
face,
(FT_Char)( tag >> 24 ),
(FT_Char)( tag >> 16 ),
(FT_Char)( tag >> 8 ),
(FT_Char)( tag ) ));
entry = face->dir_tables;
limit = entry + face->num_tables;
for ( ; entry < limit; entry++ )
{
/* For compatibility with Windows, we consider 0-length */
/* tables the same as missing tables. */
if ( entry->Tag == tag && entry->Length != 0 )
{
FT_TRACE3(( "found table.\n" ));
return entry;
}
}
FT_TRACE3(( "could not find table!\n" ));
return 0;
}
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_goto_table */
/* */
/* <Description> */
/* Looks for a TrueType table by name, then seek a stream to it. */
/* */
/* <Input> */
/* face :: A face object handle. */
/* */
/* tag :: The searched tag. */
/* */
/* stream :: The stream to seek when the table is found. */
/* */
/* <Output> */
/* length :: The length of the table if found, undefined otherwise. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_LOCAL_DEF( FT_Error )
tt_face_goto_table( TT_Face face,
FT_ULong tag,
FT_Stream stream,
FT_ULong* length )
{
TT_Table table;
FT_Error error;
table = tt_face_lookup_table( face, tag );
if ( table )
{
if ( length )
*length = table->Length;
if ( FT_STREAM_SEEK( table->Offset ) )
goto Exit;
}
else
error = SFNT_Err_Table_Missing;
Exit:
return error;
}
/* In theory, we should check the values of `search_range', */
/* `entry_selector', and `range_shift' to detect non-SFNT based files */
/* whose header might also start with 0x100000L (yes, these exist). */
/* */
/* Very unfortunately, many TrueType fonts don't have these fields */
/* set correctly and we must ignore them to support them. An alternative */
/* way to check the font file is thus to: */
/* */
/* - check that `num_tables' is valid */
/* - look for a "head" table, check its size, and parse it to */
/* see if its "magic" field is correctly set */
/* */
/* When checking directory entries, ignore the tables `glyx' and `locx' */
/* which are hacked-out versions of `glyf' and `loca' in some PostScript */
/* Type 42 fonts, and will generally be invalid. */
/* */
static FT_Error
sfnt_dir_check( FT_Stream stream,
FT_ULong offset,
FT_UInt num_tables )
{
FT_Error error;
FT_UInt nn, has_head = 0;
const FT_ULong glyx_tag = FT_MAKE_TAG( 'g', 'l', 'y', 'x' );
const FT_ULong locx_tag = FT_MAKE_TAG( 'l', 'o', 'c', 'x' );
static const FT_Frame_Field sfnt_dir_entry_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE TT_TableRec
FT_FRAME_START( 16 ),
FT_FRAME_ULONG( Tag ),
FT_FRAME_ULONG( CheckSum ),
FT_FRAME_ULONG( Offset ),
FT_FRAME_ULONG( Length ),
FT_FRAME_END
};
/* if 'num_tables' is 0, read the table count from the file */
if ( num_tables == 0 )
{
if ( FT_STREAM_SEEK( offset ) ||
FT_STREAM_SKIP( 4 ) ||
FT_READ_USHORT( num_tables ) ||
FT_STREAM_SKIP( 6 ) )
goto Bad_Format;
if ( offset + 12 + num_tables*16 > stream->size )
goto Bad_Format;
}
else if ( FT_STREAM_SEEK( offset + 12 ) )
goto Bad_Format;
for ( nn = 0; nn < num_tables; nn++ )
{
TT_TableRec table;
if ( FT_STREAM_READ_FIELDS( sfnt_dir_entry_fields, &table ) )
goto Bad_Format;
if ( table.Offset + table.Length > stream->size &&
table.Tag != glyx_tag && table.Tag != locx_tag )
goto Bad_Format;
if ( table.Tag == TTAG_head )
{
FT_UInt32 magic;
has_head = 1;
/* The table length should be 0x36, but certain font tools
* make it 0x38, so we will just check that it is greater.
*
* Note that according to the specification,
* the table must be padded to 32-bit lengths, but this doesn't
* apply to the value of its "Length" field!
*/
if ( table.Length < 0x36 ||
FT_STREAM_SEEK( table.Offset + 12 ) ||
FT_READ_ULONG( magic ) ||
magic != 0x5F0F3CF5UL )
goto Bad_Format;
if ( FT_STREAM_SEEK( offset + 28 + 16*nn ) )
goto Bad_Format;
}
}
if ( has_head == 0 )
goto Bad_Format;
Exit:
return error;
Bad_Format:
error = SFNT_Err_Unknown_File_Format;
goto Exit;
}
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_load_sfnt_header */
/* */
/* <Description> */
/* Loads the header of a SFNT font file. Supports collections. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* */
/* stream :: The input stream. */
/* */
/* face_index :: If the font is a collection, the number of the font */
/* in the collection. Must be zero otherwise. */
/* */
/* <Output> */
/* sfnt :: The SFNT header. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* The stream cursor must be at the font file's origin. */
/* */
/* This function recognizes fonts embedded in a `TrueType collection' */
/* */
/* The header will be checked whether it is valid by looking at the */
/* values of `search_range', `entry_selector', and `range_shift'. */
/* */
FT_LOCAL_DEF( FT_Error )
tt_face_load_sfnt_header( TT_Face face,
FT_Stream stream,
FT_Long face_index,
SFNT_Header sfnt )
{
FT_Error error;
FT_ULong format_tag, offset;
FT_Memory memory = stream->memory;
static const FT_Frame_Field sfnt_header_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE SFNT_HeaderRec
FT_FRAME_START( 8 ),
FT_FRAME_USHORT( num_tables ),
FT_FRAME_USHORT( search_range ),
FT_FRAME_USHORT( entry_selector ),
FT_FRAME_USHORT( range_shift ),
FT_FRAME_END
};
static const FT_Frame_Field ttc_header_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE TTC_HeaderRec
FT_FRAME_START( 8 ),
FT_FRAME_LONG( version ),
FT_FRAME_LONG( count ),
FT_FRAME_END
};
FT_TRACE2(( "tt_face_load_sfnt_header: %08p, %ld\n",
face, face_index ));
face->ttc_header.tag = 0;
face->ttc_header.version = 0;
face->ttc_header.count = 0;
face->num_tables = 0;
/* First of all, read the first 4 bytes. If it is `ttcf', then the */
/* file is a TrueType collection, otherwise it is a single-face font. */
/* */
offset = FT_STREAM_POS();
if ( FT_READ_ULONG( format_tag ) )
goto Exit;
if ( format_tag == TTAG_ttcf )
{
FT_Int n;
FT_TRACE3(( "tt_face_load_sfnt_header: file is a collection\n" ));
/* It is a TrueType collection, i.e. a file containing several */
/* font files. Read the font directory now */
if ( FT_STREAM_READ_FIELDS( ttc_header_fields, &face->ttc_header ) )
goto Exit;
/* now read the offsets of each font in the file */
if ( FT_NEW_ARRAY( face->ttc_header.offsets, face->ttc_header.count ) ||
FT_FRAME_ENTER( face->ttc_header.count * 4L ) )
goto Exit;
for ( n = 0; n < face->ttc_header.count; n++ )
face->ttc_header.offsets[n] = FT_GET_ULONG();
FT_FRAME_EXIT();
/* check face index */
if ( face_index >= face->ttc_header.count )
{
error = SFNT_Err_Bad_Argument;
goto Exit;
}
/* seek to the appropriate TrueType file, then read tag */
offset = face->ttc_header.offsets[face_index];
if ( FT_STREAM_SEEK( offset ) ||
FT_READ_LONG( format_tag ) )
goto Exit;
}
/* the format tag was read, now check the rest of the header */
sfnt->format_tag = format_tag;
sfnt->offset = offset;
if ( FT_STREAM_READ_FIELDS( sfnt_header_fields, sfnt ) )
goto Exit;
/* now check the sfnt directory */
error = sfnt_dir_check( stream, offset, sfnt->num_tables );
if ( error )
{
FT_TRACE2(( "tt_face_load_sfnt_header: file is not SFNT!\n" ));
error = SFNT_Err_Unknown_File_Format;
goto Exit;
}
/* disallow face index values > 0 for non-TTC files */
if ( format_tag != TTAG_ttcf && face_index > 0 )
error = SFNT_Err_Bad_Argument;
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_load_directory */
/* */
/* <Description> */
/* Loads the table directory into a face object. */
/* */
/* <InOut> */
/* face :: A handle to the target face object. */
/* */
/* <Input> */
/* stream :: The input stream. */
/* */
/* sfnt :: The SFNT directory header. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* The stream cursor must be at the font file's origin. */
/* */
FT_LOCAL_DEF( FT_Error )
tt_face_load_directory( TT_Face face,
FT_Stream stream,
SFNT_Header sfnt )
{
FT_Error error;
FT_Memory memory = stream->memory;
TT_TableRec *entry, *limit;
FT_TRACE2(( "tt_face_load_directory: %08p\n", face ));
FT_TRACE2(( "-- Tables count: %12u\n", sfnt->num_tables ));
FT_TRACE2(( "-- Format version: %08lx\n", sfnt->format_tag ));
face->num_tables = sfnt->num_tables;
if ( FT_NEW_ARRAY( face->dir_tables, face->num_tables ) )
goto Exit;
if ( FT_STREAM_SEEK( sfnt->offset + 12 ) ||
FT_FRAME_ENTER( face->num_tables * 16L ) )
goto Exit;
entry = face->dir_tables;
limit = entry + face->num_tables;
for ( ; entry < limit; entry++ )
{ /* loop through the tables and get all entries */
entry->Tag = FT_GET_TAG4();
entry->CheckSum = FT_GET_ULONG();
entry->Offset = FT_GET_LONG();
entry->Length = FT_GET_LONG();
FT_TRACE2(( " %c%c%c%c - %08lx - %08lx\n",
(FT_Char)( entry->Tag >> 24 ),
(FT_Char)( entry->Tag >> 16 ),
(FT_Char)( entry->Tag >> 8 ),
(FT_Char)( entry->Tag ),
entry->Offset,
entry->Length ));
}
FT_FRAME_EXIT();
FT_TRACE2(( "Directory loaded\n\n" ));
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_load_any */
/* */
/* <Description> */
/* Loads any font table into client memory. */
/* */
/* <Input> */
/* face :: The face object to look for. */
/* */
/* tag :: The tag of table to load. Use the value 0 if you want */
/* to access the whole font file, else set this parameter */
/* to a valid TrueType table tag that you can forge with */
/* the MAKE_TT_TAG macro. */
/* */
/* offset :: The starting offset in the table (or the file if */
/* tag == 0). */
/* */
/* length :: The address of the decision variable: */
/* */
/* If length == NULL: */
/* Loads the whole table. Returns an error if */
/* `offset' == 0! */
/* */
/* If *length == 0: */
/* Exits immediately; returning the length of the given */
/* table or of the font file, depending on the value of */
/* `tag'. */
/* */
/* If *length != 0: */
/* Loads the next `length' bytes of table or font, */
/* starting at offset `offset' (in table or font too). */
/* */
/* <Output> */
/* buffer :: The address of target buffer. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_LOCAL_DEF( FT_Error )
tt_face_load_any( TT_Face face,
FT_ULong tag,
FT_Long offset,
FT_Byte* buffer,
FT_ULong* length )
{
FT_Error error;
FT_Stream stream;
TT_Table table;
FT_ULong size;
if ( tag != 0 )
{
/* look for tag in font directory */
table = tt_face_lookup_table( face, tag );
if ( !table )
{
error = SFNT_Err_Table_Missing;
goto Exit;
}
offset += table->Offset;
size = table->Length;
}
else
/* tag == 0 -- the user wants to access the font file directly */
size = face->root.stream->size;
if ( length && *length == 0 )
{
*length = size;
return SFNT_Err_Ok;
}
if ( length )
size = *length;
stream = face->root.stream;
/* the `if' is syntactic sugar for picky compilers */
if ( FT_STREAM_READ_AT( offset, buffer, size ) )
goto Exit;
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_load_generic_header */
/* */
/* <Description> */
/* Loads the TrueType table `head' or `bhed'. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* */
/* stream :: The input stream. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
static FT_Error
tt_face_load_generic_header( TT_Face face,
FT_Stream stream,
FT_ULong tag )
{
FT_Error error;
TT_Header* header;
static const FT_Frame_Field header_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE TT_Header
FT_FRAME_START( 54 ),
FT_FRAME_ULONG ( Table_Version ),
FT_FRAME_ULONG ( Font_Revision ),
FT_FRAME_LONG ( CheckSum_Adjust ),
FT_FRAME_LONG ( Magic_Number ),
FT_FRAME_USHORT( Flags ),
FT_FRAME_USHORT( Units_Per_EM ),
FT_FRAME_LONG ( Created[0] ),
FT_FRAME_LONG ( Created[1] ),
FT_FRAME_LONG ( Modified[0] ),
FT_FRAME_LONG ( Modified[1] ),
FT_FRAME_SHORT ( xMin ),
FT_FRAME_SHORT ( yMin ),
FT_FRAME_SHORT ( xMax ),
FT_FRAME_SHORT ( yMax ),
FT_FRAME_USHORT( Mac_Style ),
FT_FRAME_USHORT( Lowest_Rec_PPEM ),
FT_FRAME_SHORT ( Font_Direction ),
FT_FRAME_SHORT ( Index_To_Loc_Format ),
FT_FRAME_SHORT ( Glyph_Data_Format ),
FT_FRAME_END
};
FT_TRACE2(( "tt_face_load_generic_header: "
"%08p, looking up font table `%c%c%c%c'.\n",
face,
(FT_Char)( tag >> 24 ),
(FT_Char)( tag >> 16 ),
(FT_Char)( tag >> 8 ),
(FT_Char)( tag ) ));
error = face->goto_table( face, tag, stream, 0 );
if ( error )
{
FT_TRACE2(( "tt_face_load_generic_header: Font table is missing!\n" ));
goto Exit;
}
header = &face->header;
if ( FT_STREAM_READ_FIELDS( header_fields, header ) )
goto Exit;
FT_TRACE2(( " Units per EM: %8u\n", header->Units_Per_EM ));
FT_TRACE2(( " IndexToLoc: %8d\n", header->Index_To_Loc_Format ));
FT_TRACE2(( "tt_face_load_generic_header: Font table loaded.\n" ));
Exit:
return error;
}
FT_LOCAL_DEF( FT_Error )
tt_face_load_header( TT_Face face,
FT_Stream stream )
{
return tt_face_load_generic_header( face, stream, TTAG_head );
}
#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
FT_LOCAL_DEF( FT_Error )
tt_face_load_bitmap_header( TT_Face face,
FT_Stream stream )
{
return tt_face_load_generic_header( face, stream, TTAG_bhed );
}
#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_load_max_profile */
/* */
/* <Description> */
/* Loads the maximum profile into a face object. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* */
/* stream :: The input stream. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_LOCAL_DEF( FT_Error )
tt_face_load_max_profile( TT_Face face,
FT_Stream stream )
{
FT_Error error;
TT_MaxProfile* maxProfile = &face->max_profile;
const FT_Frame_Field maxp_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE TT_MaxProfile
FT_FRAME_START( 6 ),
FT_FRAME_LONG ( version ),
FT_FRAME_USHORT( numGlyphs ),
FT_FRAME_END
};
const FT_Frame_Field maxp_fields_extra[] =
{
FT_FRAME_START( 26 ),
FT_FRAME_USHORT( maxPoints ),
FT_FRAME_USHORT( maxContours ),
FT_FRAME_USHORT( maxCompositePoints ),
FT_FRAME_USHORT( maxCompositeContours ),
FT_FRAME_USHORT( maxZones ),
FT_FRAME_USHORT( maxTwilightPoints ),
FT_FRAME_USHORT( maxStorage ),
FT_FRAME_USHORT( maxFunctionDefs ),
FT_FRAME_USHORT( maxInstructionDefs ),
FT_FRAME_USHORT( maxStackElements ),
FT_FRAME_USHORT( maxSizeOfInstructions ),
FT_FRAME_USHORT( maxComponentElements ),
FT_FRAME_USHORT( maxComponentDepth ),
FT_FRAME_END
};
FT_TRACE2(( "Load_TT_MaxProfile: %08p\n", face ));
error = face->goto_table( face, TTAG_maxp, stream, 0 );
if ( error )
goto Exit;
if ( FT_STREAM_READ_FIELDS( maxp_fields, maxProfile ) )
goto Exit;
maxProfile->maxPoints = 0;
maxProfile->maxContours = 0;
maxProfile->maxCompositePoints = 0;
maxProfile->maxCompositeContours = 0;
maxProfile->maxZones = 0;
maxProfile->maxTwilightPoints = 0;
maxProfile->maxStorage = 0;
maxProfile->maxFunctionDefs = 0;
maxProfile->maxInstructionDefs = 0;
maxProfile->maxStackElements = 0;
maxProfile->maxSizeOfInstructions = 0;
maxProfile->maxComponentElements = 0;
maxProfile->maxComponentDepth = 0;
if ( maxProfile->version >= 0x10000L )
{
if ( FT_STREAM_READ_FIELDS( maxp_fields_extra, maxProfile ) )
goto Exit;
/* XXX: an adjustment that is necessary to load certain */
/* broken fonts like `Keystrokes MT' :-( */
/* */
/* We allocate 64 function entries by default when */
/* the maxFunctionDefs field is null. */
if ( maxProfile->maxFunctionDefs == 0 )
maxProfile->maxFunctionDefs = 64;
face->root.num_glyphs = maxProfile->numGlyphs;
face->root.internal->max_points =
(FT_UShort)FT_MAX( maxProfile->maxCompositePoints,
maxProfile->maxPoints );
face->root.internal->max_contours =
(FT_Short)FT_MAX( maxProfile->maxCompositeContours,
maxProfile->maxContours );
face->max_components = (FT_ULong)maxProfile->maxComponentElements +
maxProfile->maxComponentDepth;
/* XXX: some fonts have maxComponents set to 0; we will */
/* then use 16 of them by default. */
if ( face->max_components == 0 )
face->max_components = 16;
/* We also increase maxPoints and maxContours in order to support */
/* some broken fonts. */
face->root.internal->max_points += (FT_UShort)8;
face->root.internal->max_contours += (FT_Short) 4;
}
FT_TRACE2(( "MAXP loaded.\n" ));
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_load_metrics */
/* */
/* <Description> */
/* Loads the horizontal or vertical metrics table into a face object. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* */
/* stream :: The input stream. */
/* */
/* vertical :: A boolean flag. If set, load vertical metrics. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
static FT_Error
tt_face_load_metrics( TT_Face face,
FT_Stream stream,
FT_Bool vertical )
{
FT_Error error;
FT_Memory memory = stream->memory;
FT_ULong table_len;
FT_Long num_shorts, num_longs, num_shorts_checked;
TT_LongMetrics * longs;
TT_ShortMetrics** shorts;
FT_TRACE2(( "TT_Load_%s_Metrics: %08p\n", vertical ? "Vertical"
: "Horizontal",
face ));
if ( vertical )
{
/* The table is optional, quit silently if it wasn't found */
/* */
/* XXX: Some fonts have a valid vertical header with a non-null */
/* `number_of_VMetrics' fields, but no corresponding `vmtx' */
/* table to get the metrics from (e.g. mingliu). */
/* */
/* For safety, we set the field to 0! */
/* */
error = face->goto_table( face, TTAG_vmtx, stream, &table_len );
if ( error )
{
/* Set number_Of_VMetrics to 0! */
FT_TRACE2(( " no vertical header in file.\n" ));
face->vertical.number_Of_VMetrics = 0;
error = SFNT_Err_Ok;
goto Exit;
}
num_longs = face->vertical.number_Of_VMetrics;
longs = (TT_LongMetrics *)&face->vertical.long_metrics;
shorts = (TT_ShortMetrics**)&face->vertical.short_metrics;
}
else
{
error = face->goto_table( face, TTAG_hmtx, stream, &table_len );
if ( error )
{
#ifdef FT_CONFIG_OPTION_INCREMENTAL
/* If this is an incrementally loaded font and there are */
/* overriding metrics tolerate a missing 'hmtx' table. */
if ( face->root.internal->incremental_interface &&
face->root.internal->incremental_interface->funcs->
get_glyph_metrics )
{
face->horizontal.number_Of_HMetrics = 0;
error = SFNT_Err_Ok;
goto Exit;
}
#endif
FT_ERROR(( " no horizontal metrics in file!\n" ));
error = SFNT_Err_Hmtx_Table_Missing;
goto Exit;
}
num_longs = face->horizontal.number_Of_HMetrics;
longs = (TT_LongMetrics *)&face->horizontal.long_metrics;
shorts = (TT_ShortMetrics**)&face->horizontal.short_metrics;
}
/* never trust derived values */
num_shorts = face->max_profile.numGlyphs - num_longs;
num_shorts_checked = ( table_len - num_longs * 4L ) / 2;
if ( num_shorts < 0 )
{
FT_ERROR(( "TT_Load_%s_Metrics: more metrics than glyphs!\n",
vertical ? "Vertical"
: "Horizontal" ));
error = vertical ? SFNT_Err_Invalid_Vert_Metrics
: SFNT_Err_Invalid_Horiz_Metrics;
goto Exit;
}
if ( FT_NEW_ARRAY( *longs, num_longs ) ||
FT_NEW_ARRAY( *shorts, num_shorts ) )
goto Exit;
if ( FT_FRAME_ENTER( table_len ) )
goto Exit;
{
TT_LongMetrics cur = *longs;
TT_LongMetrics limit = cur + num_longs;
for ( ; cur < limit; cur++ )
{
cur->advance = FT_GET_USHORT();
cur->bearing = FT_GET_SHORT();
}
}
/* do we have an inconsistent number of metric values? */
{
TT_ShortMetrics* cur = *shorts;
TT_ShortMetrics* limit = cur +
FT_MIN( num_shorts, num_shorts_checked );
for ( ; cur < limit; cur++ )
*cur = FT_GET_SHORT();
/* we fill up the missing left side bearings with the */
/* last valid value. Since this will occur for buggy CJK */
/* fonts usually only, nothing serious will happen */
if ( num_shorts > num_shorts_checked && num_shorts_checked > 0 )
{
FT_Short val = (*shorts)[num_shorts_checked - 1];
limit = *shorts + num_shorts;
for ( ; cur < limit; cur++ )
*cur = val;
}
}
FT_FRAME_EXIT();
FT_TRACE2(( "loaded\n" ));
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_load_metrics_header */
/* */
/* <Description> */
/* Loads the horizontal or vertical header in a face object. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* */
/* stream :: The input stream. */
/* */
/* vertical :: A boolean flag. If set, load vertical metrics. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_LOCAL_DEF( FT_Error )
tt_face_load_metrics_header( TT_Face face,
FT_Stream stream,
FT_Bool vertical )
{
FT_Error error;
TT_HoriHeader* header;
const FT_Frame_Field metrics_header_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE TT_HoriHeader
FT_FRAME_START( 36 ),
FT_FRAME_ULONG ( Version ),
FT_FRAME_SHORT ( Ascender ),
FT_FRAME_SHORT ( Descender ),
FT_FRAME_SHORT ( Line_Gap ),
FT_FRAME_USHORT( advance_Width_Max ),
FT_FRAME_SHORT ( min_Left_Side_Bearing ),
FT_FRAME_SHORT ( min_Right_Side_Bearing ),
FT_FRAME_SHORT ( xMax_Extent ),
FT_FRAME_SHORT ( caret_Slope_Rise ),
FT_FRAME_SHORT ( caret_Slope_Run ),
FT_FRAME_SHORT ( caret_Offset ),
FT_FRAME_SHORT ( Reserved[0] ),
FT_FRAME_SHORT ( Reserved[1] ),
FT_FRAME_SHORT ( Reserved[2] ),
FT_FRAME_SHORT ( Reserved[3] ),
FT_FRAME_SHORT ( metric_Data_Format ),
FT_FRAME_USHORT( number_Of_HMetrics ),
FT_FRAME_END
};
FT_TRACE2(( vertical ? "Vertical header " : "Horizontal header " ));
if ( vertical )
{
face->vertical_info = 0;
/* The vertical header table is optional, so return quietly if */
/* we don't find it. */
error = face->goto_table( face, TTAG_vhea, stream, 0 );
if ( error )
{
error = SFNT_Err_Ok;
goto Exit;
}
face->vertical_info = 1;
header = (TT_HoriHeader*)&face->vertical;
}
else
{
/* The horizontal header is mandatory; return an error if we */
/* don't find it. */
error = face->goto_table( face, TTAG_hhea, stream, 0 );
if ( error )
{
error = SFNT_Err_Horiz_Header_Missing;
goto Exit;
}
header = &face->horizontal;
}
if ( FT_STREAM_READ_FIELDS( metrics_header_fields, header ) )
goto Exit;
header->long_metrics = NULL;
header->short_metrics = NULL;
FT_TRACE2(( "loaded\n" ));
/* Now try to load the corresponding metrics */
error = tt_face_load_metrics( face, stream, vertical );
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_load_names */
/* */
/* <Description> */
/* Loads the name records. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* */
/* stream :: The input stream. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_LOCAL_DEF( FT_Error )
tt_face_load_names( TT_Face face,
FT_Stream stream )
{
FT_Error error;
FT_Memory memory = stream->memory;
FT_ULong table_pos, table_len;
FT_ULong storage_start, storage_limit;
FT_UInt count;
TT_NameTable table;
static const FT_Frame_Field name_table_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE TT_NameTableRec
FT_FRAME_START( 6 ),
FT_FRAME_USHORT( format ),
FT_FRAME_USHORT( numNameRecords ),
FT_FRAME_USHORT( storageOffset ),
FT_FRAME_END
};
static const FT_Frame_Field name_record_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE TT_NameEntryRec
/* no FT_FRAME_START */
FT_FRAME_USHORT( platformID ),
FT_FRAME_USHORT( encodingID ),
FT_FRAME_USHORT( languageID ),
FT_FRAME_USHORT( nameID ),
FT_FRAME_USHORT( stringLength ),
FT_FRAME_USHORT( stringOffset ),
FT_FRAME_END
};
table = &face->name_table;
table->stream = stream;
FT_TRACE2(( "Names " ));
error = face->goto_table( face, TTAG_name, stream, &table_len );
if ( error )
{
/* The name table is required so indicate failure. */
FT_TRACE2(( "is missing!\n" ));
error = SFNT_Err_Name_Table_Missing;
goto Exit;
}
table_pos = FT_STREAM_POS();
if ( FT_STREAM_READ_FIELDS( name_table_fields, table ) )
goto Exit;
/* Some popular Asian fonts have an invalid `storageOffset' value */
/* (it should be at least "6 + 12*num_names"). However, the string */
/* offsets, computed as "storageOffset + entry->stringOffset", are */
/* valid pointers within the name table... */
/* */
/* We thus can't check `storageOffset' right now. */
/* */
storage_start = table_pos + 6 + 12*table->numNameRecords;
storage_limit = table_pos + table_len;
if ( storage_start > storage_limit )
{
FT_ERROR(( "tt_face_load_names: invalid `name' table\n" ));
error = SFNT_Err_Name_Table_Missing;
goto Exit;
}
/* Allocate the array of name records. */
count = table->numNameRecords;
table->numNameRecords = 0;
if ( FT_NEW_ARRAY( table->names, count ) ||
FT_FRAME_ENTER( count * 12 ) )
goto Exit;
/* Load the name records and determine how much storage is needed */
/* to hold the strings themselves. */
{
TT_NameEntryRec* entry = table->names;
for ( ; count > 0; count-- )
{
if ( FT_STREAM_READ_FIELDS( name_record_fields, entry ) )
continue;
/* check that the name is not empty */
if ( entry->stringLength == 0 )
continue;
/* check that the name string is within the table */
entry->stringOffset += table_pos + table->storageOffset;
if ( entry->stringOffset < storage_start ||
entry->stringOffset + entry->stringLength > storage_limit )
{
/* invalid entry - ignore it */
entry->stringOffset = 0;
entry->stringLength = 0;
continue;
}
entry++;
}
table->numNameRecords = (FT_UInt)( entry - table->names );
}
FT_FRAME_EXIT();
FT_TRACE2(( "loaded\n" ));
/* everything went well, update face->num_names */
face->num_names = (FT_UShort) table->numNameRecords;
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_free_names */
/* */
/* <Description> */
/* Frees the name records. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* */
FT_LOCAL_DEF( void )
tt_face_free_names( TT_Face face )
{
FT_Memory memory = face->root.driver->root.memory;
TT_NameTable table = &face->name_table;
TT_NameEntry entry = table->names;
FT_UInt count = table->numNameRecords;
for ( ; count > 0; count--, entry++ )
{
FT_FREE( entry->string );
entry->stringLength = 0;
}
/* free strings table */
FT_FREE( table->names );
table->numNameRecords = 0;
table->format = 0;
table->storageOffset = 0;
}
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_load_cmap */
/* */
/* <Description> */
/* Loads the cmap directory in a face object. The cmaps itselves are */
/* loaded on demand in the `ttcmap.c' module. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* */
/* stream :: A handle to the input stream. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_LOCAL_DEF( FT_Error )
tt_face_load_cmap( TT_Face face,
FT_Stream stream )
{
FT_Error error;
error = face->goto_table( face, TTAG_cmap, stream, &face->cmap_size );
if ( error )
{
FT_TRACE2(( "No `cmap' table in font !\n" ));
error = SFNT_Err_CMap_Table_Missing;
goto Exit;
}
if ( !FT_FRAME_EXTRACT( face->cmap_size, face->cmap_table ) )
FT_TRACE2(( "`cmap' table loaded\n" ));
else
{
FT_ERROR(( "`cmap' table is too short!\n" ));
face->cmap_size = 0;
}
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_load_os2 */
/* */
/* <Description> */
/* Loads the OS2 table. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* */
/* stream :: A handle to the input stream. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_LOCAL_DEF( FT_Error )
tt_face_load_os2( TT_Face face,
FT_Stream stream )
{
FT_Error error;
TT_OS2* os2;
const FT_Frame_Field os2_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE TT_OS2
FT_FRAME_START( 78 ),
FT_FRAME_USHORT( version ),
FT_FRAME_SHORT ( xAvgCharWidth ),
FT_FRAME_USHORT( usWeightClass ),
FT_FRAME_USHORT( usWidthClass ),
FT_FRAME_SHORT ( fsType ),
FT_FRAME_SHORT ( ySubscriptXSize ),
FT_FRAME_SHORT ( ySubscriptYSize ),
FT_FRAME_SHORT ( ySubscriptXOffset ),
FT_FRAME_SHORT ( ySubscriptYOffset ),
FT_FRAME_SHORT ( ySuperscriptXSize ),
FT_FRAME_SHORT ( ySuperscriptYSize ),
FT_FRAME_SHORT ( ySuperscriptXOffset ),
FT_FRAME_SHORT ( ySuperscriptYOffset ),
FT_FRAME_SHORT ( yStrikeoutSize ),
FT_FRAME_SHORT ( yStrikeoutPosition ),
FT_FRAME_SHORT ( sFamilyClass ),
FT_FRAME_BYTE ( panose[0] ),
FT_FRAME_BYTE ( panose[1] ),
FT_FRAME_BYTE ( panose[2] ),
FT_FRAME_BYTE ( panose[3] ),
FT_FRAME_BYTE ( panose[4] ),
FT_FRAME_BYTE ( panose[5] ),
FT_FRAME_BYTE ( panose[6] ),
FT_FRAME_BYTE ( panose[7] ),
FT_FRAME_BYTE ( panose[8] ),
FT_FRAME_BYTE ( panose[9] ),
FT_FRAME_ULONG ( ulUnicodeRange1 ),
FT_FRAME_ULONG ( ulUnicodeRange2 ),
FT_FRAME_ULONG ( ulUnicodeRange3 ),
FT_FRAME_ULONG ( ulUnicodeRange4 ),
FT_FRAME_BYTE ( achVendID[0] ),
FT_FRAME_BYTE ( achVendID[1] ),
FT_FRAME_BYTE ( achVendID[2] ),
FT_FRAME_BYTE ( achVendID[3] ),
FT_FRAME_USHORT( fsSelection ),
FT_FRAME_USHORT( usFirstCharIndex ),
FT_FRAME_USHORT( usLastCharIndex ),
FT_FRAME_SHORT ( sTypoAscender ),
FT_FRAME_SHORT ( sTypoDescender ),
FT_FRAME_SHORT ( sTypoLineGap ),
FT_FRAME_USHORT( usWinAscent ),
FT_FRAME_USHORT( usWinDescent ),
FT_FRAME_END
};
const FT_Frame_Field os2_fields_extra[] =
{
FT_FRAME_START( 8 ),
FT_FRAME_ULONG( ulCodePageRange1 ),
FT_FRAME_ULONG( ulCodePageRange2 ),
FT_FRAME_END
};
const FT_Frame_Field os2_fields_extra2[] =
{
FT_FRAME_START( 10 ),
FT_FRAME_SHORT ( sxHeight ),
FT_FRAME_SHORT ( sCapHeight ),
FT_FRAME_USHORT( usDefaultChar ),
FT_FRAME_USHORT( usBreakChar ),
FT_FRAME_USHORT( usMaxContext ),
FT_FRAME_END
};
FT_TRACE2(( "OS/2 Table " ));
/* We now support old Mac fonts where the OS/2 table doesn't */
/* exist. Simply put, we set the `version' field to 0xFFFF */
/* and test this value each time we need to access the table. */
error = face->goto_table( face, TTAG_OS2, stream, 0 );
if ( error )
{
FT_TRACE2(( "is missing!\n" ));
face->os2.version = 0xFFFFU;
error = SFNT_Err_Ok;
goto Exit;
}
os2 = &face->os2;
if ( FT_STREAM_READ_FIELDS( os2_fields, os2 ) )
goto Exit;
os2->ulCodePageRange1 = 0;
os2->ulCodePageRange2 = 0;
os2->sxHeight = 0;
os2->sCapHeight = 0;
os2->usDefaultChar = 0;
os2->usBreakChar = 0;
os2->usMaxContext = 0;
if ( os2->version >= 0x0001 )
{
/* only version 1 tables */
if ( FT_STREAM_READ_FIELDS( os2_fields_extra, os2 ) )
goto Exit;
if ( os2->version >= 0x0002 )
{
/* only version 2 tables */
if ( FT_STREAM_READ_FIELDS( os2_fields_extra2, os2 ) )
goto Exit;
}
}
FT_TRACE2(( "loaded\n" ));
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_load_postscript */
/* */
/* <Description> */
/* Loads the Postscript table. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* */
/* stream :: A handle to the input stream. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_LOCAL_DEF( FT_Error )
tt_face_load_postscript( TT_Face face,
FT_Stream stream )
{
FT_Error error;
TT_Postscript* post = &face->postscript;
static const FT_Frame_Field post_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE TT_Postscript
FT_FRAME_START( 32 ),
FT_FRAME_ULONG( FormatType ),
FT_FRAME_ULONG( italicAngle ),
FT_FRAME_SHORT( underlinePosition ),
FT_FRAME_SHORT( underlineThickness ),
FT_FRAME_ULONG( isFixedPitch ),
FT_FRAME_ULONG( minMemType42 ),
FT_FRAME_ULONG( maxMemType42 ),
FT_FRAME_ULONG( minMemType1 ),
FT_FRAME_ULONG( maxMemType1 ),
FT_FRAME_END
};
FT_TRACE2(( "PostScript " ));
error = face->goto_table( face, TTAG_post, stream, 0 );
if ( error )
return SFNT_Err_Post_Table_Missing;
if ( FT_STREAM_READ_FIELDS( post_fields, post ) )
return error;
/* we don't load the glyph names, we do that in another */
/* module (ttpost). */
FT_TRACE2(( "loaded\n" ));
return SFNT_Err_Ok;
}
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_load_pclt */
/* */
/* <Description> */
/* Loads the PCL 5 Table. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* */
/* stream :: A handle to the input stream. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_LOCAL_DEF( FT_Error )
tt_face_load_pclt( TT_Face face,
FT_Stream stream )
{
static const FT_Frame_Field pclt_fields[] =
{
#undef FT_STRUCTURE
#define FT_STRUCTURE TT_PCLT
FT_FRAME_START( 54 ),
FT_FRAME_ULONG ( Version ),
FT_FRAME_ULONG ( FontNumber ),
FT_FRAME_USHORT( Pitch ),
FT_FRAME_USHORT( xHeight ),
FT_FRAME_USHORT( Style ),
FT_FRAME_USHORT( TypeFamily ),
FT_FRAME_USHORT( CapHeight ),
FT_FRAME_BYTES ( TypeFace, 16 ),
FT_FRAME_BYTES ( CharacterComplement, 8 ),
FT_FRAME_BYTES ( FileName, 6 ),
FT_FRAME_CHAR ( StrokeWeight ),
FT_FRAME_CHAR ( WidthType ),
FT_FRAME_BYTE ( SerifStyle ),
FT_FRAME_BYTE ( Reserved ),
FT_FRAME_END
};
FT_Error error;
TT_PCLT* pclt = &face->pclt;
FT_TRACE2(( "PCLT " ));
/* optional table */
error = face->goto_table( face, TTAG_PCLT, stream, 0 );
if ( error )
{
FT_TRACE2(( "missing (optional)\n" ));
pclt->Version = 0;
return SFNT_Err_Ok;
}
if ( FT_STREAM_READ_FIELDS( pclt_fields, pclt ) )
goto Exit;
FT_TRACE2(( "loaded\n" ));
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_load_gasp */
/* */
/* <Description> */
/* Loads the `gasp' table into a face object. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* */
/* stream :: The input stream. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_LOCAL_DEF( FT_Error )
tt_face_load_gasp( TT_Face face,
FT_Stream stream )
{
FT_Error error;
FT_Memory memory = stream->memory;
FT_UInt j,num_ranges;
TT_GaspRange gaspranges;
FT_TRACE2(( "tt_face_load_gasp: %08p\n", face ));
/* the gasp table is optional */
error = face->goto_table( face, TTAG_gasp, stream, 0 );
if ( error )
return SFNT_Err_Ok;
if ( FT_FRAME_ENTER( 4L ) )
goto Exit;
face->gasp.version = FT_GET_USHORT();
face->gasp.numRanges = FT_GET_USHORT();
FT_FRAME_EXIT();
num_ranges = face->gasp.numRanges;
FT_TRACE3(( "number of ranges = %d\n", num_ranges ));
if ( FT_NEW_ARRAY( gaspranges, num_ranges ) ||
FT_FRAME_ENTER( num_ranges * 4L ) )
goto Exit;
face->gasp.gaspRanges = gaspranges;
for ( j = 0; j < num_ranges; j++ )
{
gaspranges[j].maxPPEM = FT_GET_USHORT();
gaspranges[j].gaspFlag = FT_GET_USHORT();
FT_TRACE3(( " [max:%d flag:%d]",
gaspranges[j].maxPPEM,
gaspranges[j].gaspFlag ));
}
FT_TRACE3(( "\n" ));
FT_FRAME_EXIT();
FT_TRACE2(( "GASP loaded\n" ));
Exit:
return error;
}
FT_CALLBACK_DEF( int )
tt_kern_pair_compare( const void* a,
const void* b );
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_load_kern */
/* */
/* <Description> */
/* Loads the first kerning table with format 0 in the font. Only */
/* accepts the first horizontal kerning table. Developers should use */
/* the `ftxkern' extension to access other kerning tables in the font */
/* file, if they really want to. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* */
/* stream :: The input stream. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_LOCAL_DEF( FT_Error )
tt_face_load_kern( TT_Face face,
FT_Stream stream )
{
FT_Error error;
FT_Memory memory = stream->memory;
FT_UInt n, num_tables;
/* the kern table is optional; exit silently if it is missing */
error = face->goto_table( face, TTAG_kern, stream, 0 );
if ( error )
return SFNT_Err_Ok;
if ( FT_FRAME_ENTER( 4L ) )
goto Exit;
(void)FT_GET_USHORT(); /* version */
num_tables = FT_GET_USHORT();
FT_FRAME_EXIT();
for ( n = 0; n < num_tables; n++ )
{
FT_UInt coverage;
FT_UInt length;
if ( FT_FRAME_ENTER( 6L ) )
goto Exit;
(void)FT_GET_USHORT(); /* version */
length = FT_GET_USHORT() - 6; /* substract header length */
coverage = FT_GET_USHORT();
FT_FRAME_EXIT();
if ( coverage == 0x0001 )
{
FT_UInt num_pairs;
TT_Kern0_Pair pair;
TT_Kern0_Pair limit;
/* found a horizontal format 0 kerning table! */
if ( FT_FRAME_ENTER( 8L ) )
goto Exit;
num_pairs = FT_GET_USHORT();
/* skip the rest */
FT_FRAME_EXIT();
/* allocate array of kerning pairs */
if ( FT_NEW_ARRAY( face->kern_pairs, num_pairs ) ||
FT_FRAME_ENTER( 6L * num_pairs ) )
goto Exit;
pair = face->kern_pairs;
limit = pair + num_pairs;
for ( ; pair < limit; pair++ )
{
pair->left = FT_GET_USHORT();
pair->right = FT_GET_USHORT();
pair->value = FT_GET_USHORT();
}
FT_FRAME_EXIT();
face->num_kern_pairs = num_pairs;
face->kern_table_index = n;
/* ensure that the kerning pair table is sorted (yes, some */
/* fonts have unsorted tables!) */
{
FT_UInt i;
TT_Kern0_Pair pair0;
pair0 = face->kern_pairs;
for ( i = 1; i < num_pairs; i++, pair0++ )
{
if ( tt_kern_pair_compare( pair0, pair0 + 1 ) != -1 )
{
ft_qsort( (void*)face->kern_pairs, (int)num_pairs,
sizeof ( TT_Kern0_PairRec ), tt_kern_pair_compare );
break;
}
}
}
goto Exit;
}
if ( FT_STREAM_SKIP( length ) )
goto Exit;
}
/* no kern table found -- doesn't matter */
face->kern_table_index = -1;
face->num_kern_pairs = 0;
face->kern_pairs = NULL;
Exit:
return error;
}
#undef TT_KERN_INDEX
#define TT_KERN_INDEX( g1, g2 ) ( ( (FT_ULong)g1 << 16 ) | g2 )
FT_CALLBACK_DEF( int )
tt_kern_pair_compare( const void* a,
const void* b )
{
TT_Kern0_Pair pair1 = (TT_Kern0_Pair)a;
TT_Kern0_Pair pair2 = (TT_Kern0_Pair)b;
FT_ULong index1 = TT_KERN_INDEX( pair1->left, pair1->right );
FT_ULong index2 = TT_KERN_INDEX( pair2->left, pair2->right );
return ( index1 < index2 ? -1 :
( index1 > index2 ? 1 : 0 ));
}
#undef TT_KERN_INDEX
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_load_hdmx */
/* */
/* <Description> */
/* Loads the horizontal device metrics table. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* */
/* stream :: A handle to the input stream. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
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 SFNT_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();
/* Only recognize format 0 */
if ( hdmx->version != 0 )
goto Exit;
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_ALLOC( 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;
}
/*************************************************************************/
/* */
/* <Function> */
/* tt_face_free_hdmx */
/* */
/* <Description> */
/* Frees the horizontal device metrics table. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* */
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;
}
}
/* END */