ref: b4a98378e15a13af6736b6efc4e0bb18ecf6b9d4
dir: /src/sfnt/ttload.c/
/***************************************************************************/
/* */
/* ttload.c */
/* */
/* TrueType tables loader (body). */
/* */
/* Copyright 1996-1999 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. */
/* */
/* */
/* WARNING: This file should not be compiled directly; it is meant to be */
/* included in the source of several font drivers (i.e., the TTF */
/* and OTF drivers). */
/* */
/***************************************************************************/
#include <ftdebug.h>
#include <ttload.h>
#include <tttags.h>
#include <ttcmap.h>
#include <tterrors.h>
/* required by the tracing mode */
#undef FT_COMPONENT
#define FT_COMPONENT trace_ttload
/*************************************************************************/
/* */
/* <Function> */
/* TT_LookUp_Table */
/* */
/* <Description> */
/* Looks for a TrueType table by name. */
/* */
/* <Input> */
/* face :: A face object handle. */
/* tag :: The searched tag. */
/* */
/* <Return> */
/* pointer to table directory entry. 0 if not found.. */
/* */
EXPORT_FUNC
TT_Table* TT_LookUp_Table( TT_Face face,
TT_ULong tag )
{
TT_Table* entry;
TT_Table* limit;
FT_TRACE4(( "TT_LookUp_Table( %08lx, %c%c%c%c )\n",
(TT_Long)face,
(TT_Char)(tag >> 24),
(TT_Char)(tag >> 16),
(TT_Char)(tag >> 8),
(TT_Char)(tag) ));
entry = face->dir_tables;
limit = entry + face->num_tables;
for ( ; entry < limit; entry++ )
{
if ( entry->Tag == tag )
return entry;
}
FT_TRACE4(( " Could not find table!\n" ));
return 0;
}
/*************************************************************************/
/* */
/* <Function> */
/* TT_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 */
/* */
/* <Return> */
/* pointer to table directory entry. 0 if not found.. */
/* */
EXPORT_FUNC
TT_Error TT_Goto_Table( TT_Face face,
TT_ULong tag,
FT_Stream stream,
TT_ULong *length )
{
TT_Table* table;
TT_Error error;
table = TT_LookUp_Table( face, tag );
if (table)
{
if (length)
*length = table->Length;
(void)FILE_Seek( table->Offset );
}
else
error = TT_Err_Table_Missing;
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* TT_Load_Directory */
/* */
/* <Description> */
/* Loads the table directory into a face object. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* stream :: The input stream. */
/* faceIndex :: The index of the TrueType font, if we're opening a */
/* collection. */
/* */
/* <Return> */
/* TrueType error code. 0 means success. */
/* */
/* <Note> */
/* The stream cursor must be at the font file's origin */
/* */
LOCAL_FUNC
TT_Error TT_Load_Directory( TT_Face face,
FT_Stream stream,
TT_Long faceIndex )
{
TT_Error error;
FT_Memory memory = stream->memory;
TT_TableDir tableDir;
TT_ULong tag;
TT_Table *entry, *limit;
FT_TRACE2(( "TT_Load_Directory( %08lx, %ld )\n",
(TT_Long)face, faceIndex ));
face->ttc_header.Tag = 0;
face->ttc_header.version = 0;
face->ttc_header.DirCount = 0;
face->num_tables = 0;
/* first of all, read the first 4 bytes. If it's `ttcf', then the */
/* file is a TrueType collection, otherwise it must be a normal */
/* TrueType file.. */
if ( READ_ULong(tag) )
goto Exit;
if ( tag == TTAG_ttcf )
{
TT_Int n;
FT_TRACE4(( "TT_Load_Directory: file is a collection\n" ));
/* it's a TrueType collection, i.e. a file containing several */
/* font files. Read the font directory now */
/* */
if ( ACCESS_Frame( 8 ) ) goto Exit;
face->ttc_header.version = GET_Long();
face->ttc_header.DirCount = GET_Long();
FORGET_Frame();
/* now read the offsets of each font in the file */
/* */
if ( ALLOC_ARRAY( face->ttc_header.TableDirectory,
face->ttc_header.DirCount,
TT_ULong ) ||
ACCESS_Frame( face->ttc_header.DirCount * 4L ) )
goto Exit;
for ( n = 0; n < face->ttc_header.DirCount; n++ )
face->ttc_header.TableDirectory[n] = GET_ULong();
FORGET_Frame();
/* check face index */
if (faceIndex >= face->ttc_header.DirCount)
{
error = TT_Err_Bad_Argument;
goto Exit;
}
/* if we're checking the font format, exit immediately */
if (faceIndex < 0)
goto Exit;
/* seek to the appropriate TrueType file, then read tag */
if ( FILE_Skip( face->ttc_header.TableDirectory[faceIndex] - 12 ) ||
READ_Long( tableDir.version ) )
goto Exit;
}
else
{
FT_TRACE6(( "TT_Load_Directory: file is not a collection\n" ));
/* the file isn't a collection, exit if we're asking for a */
/* collected font.. */
if (faceIndex > 0)
{
error = TT_Err_File_Is_Not_Collection;
goto Exit;
}
tableDir.version = tag;
}
if ( ACCESS_Frame( 8L ) )
goto Exit;
tableDir.numTables = GET_UShort();
tableDir.searchRange = GET_UShort();
tableDir.entrySelector = GET_UShort();
tableDir.rangeShift = GET_UShort();
FORGET_Frame();
FT_TRACE2(( "-- Tables count : %12u\n", tableDir.numTables ));
FT_TRACE2(( "-- Format version : %08lx\n", tableDir.version ));
/* Check that we have a `sfnt' format there */
/* We must also be able to accept Mac/GX fonts, as well as OT ones */
if ( tableDir.version != 0x00010000 && /* MS fonts */
tableDir.version != TTAG_true && /* Mac fonts */
tableDir.version != TTAG_OTTO ) /* OT-Type2 fonts */
{
FT_TRACE2(( "[not a valid TTF or OTF font]" ));
error = TT_Err_Invalid_File_Format;
goto Exit;
}
/* if we're performing a font format check, exit immediately */
/* with success */
if ( faceIndex < 0 )
goto Exit;
face->num_tables = tableDir.numTables;
if ( ALLOC_ARRAY( face->dir_tables,
face->num_tables,
TT_Table ) )
goto Exit;
if ( ACCESS_Frame( 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 = GET_Tag4();
entry->CheckSum = GET_ULong();
entry->Offset = GET_Long();
entry->Length = GET_Long();
FT_TRACE2(( " %c%c%c%c - %08lx - %08lx\n",
(TT_Char)(entry->Tag >> 24),
(TT_Char)(entry->Tag >> 16),
(TT_Char)(entry->Tag >> 8 ),
(TT_Char)(entry->Tag),
entry->Offset,
entry->Length ));
}
FORGET_Frame();
FT_TRACE2(( "Directory loaded\n\n" ));
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* TT_Load_Any */
/* */
/* <Description> */
/* Loads any font table into client memory. Used by the */
/* TT_Get_Font_Data() API function. */
/* */
/* <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> */
/* TrueType error code. 0 means success. */
/* */
LOCAL_FUNC
TT_Error TT_Load_Any( TT_Face face,
TT_ULong tag,
TT_Long offset,
void* buffer,
TT_Long* length )
{
TT_Error error;
FT_Stream stream;
TT_Table* table;
TT_ULong size;
if ( tag != 0 )
{
/* look for tag in font directory */
table = TT_LookUp_Table( face, tag );
if ( !table )
{
error = TT_Err_Table_Missing;
goto Exit;
}
offset += table->Offset;
size = table->Length;
}
else
/* tag = 0 -- the use want to access the font file directly */
{
size = face->root.stream->size;
}
if ( length && *length == 0 )
{
*length = size;
return TT_Err_Ok;
}
if ( length )
size = *length;
stream = face->root.stream;
(void)FILE_Read_At( offset, buffer, size );
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* TT_Load_Header */
/* */
/* <Description> */
/* Loads the TrueType font header. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* stream :: The input stream. */
/* */
/* <Return> */
/* TrueType error code. 0 means success. */
/* */
LOCAL_FUNC
TT_Error TT_Load_Header( TT_Face face,
FT_Stream stream )
{
TT_Error error;
TT_Header* header;
FT_TRACE2(( "Load_TT_Header( %08lx )\n", (TT_Long)face ));
error = face->goto_table( face, TTAG_head, stream, 0 );
if ( error )
{
FT_TRACE0(( "Font Header is missing!\n" ));
goto Exit;
}
if ( ACCESS_Frame( 54L ) )
goto Exit;
header = &face->header;
header->Table_Version = GET_ULong();
header->Font_Revision = GET_ULong();
header->CheckSum_Adjust = GET_Long();
header->Magic_Number = GET_Long();
header->Flags = GET_UShort();
header->Units_Per_EM = GET_UShort();
header->Created [0] = GET_Long();
header->Created [1] = GET_Long();
header->Modified[0] = GET_Long();
header->Modified[1] = GET_Long();
header->xMin = GET_Short();
header->yMin = GET_Short();
header->xMax = GET_Short();
header->yMax = GET_Short();
header->Mac_Style = GET_UShort();
header->Lowest_Rec_PPEM = GET_UShort();
header->Font_Direction = GET_Short();
header->Index_To_Loc_Format = GET_Short();
header->Glyph_Data_Format = GET_Short();
FORGET_Frame();
FT_TRACE2(( " Units per EM : %8u\n", header->Units_Per_EM ));
FT_TRACE2(( " IndexToLoc : %8d\n", header->Index_To_Loc_Format ));
FT_TRACE2(( "Font Header Loaded.\n" ));
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* TT_Load_MaxProfile */
/* */
/* <Description> */
/* Loads the maximum profile into a face object. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* stream :: The input stream. */
/* */
/* <Return> */
/* TrueType error code. 0 means success. */
/* */
LOCAL_FUNC
TT_Error TT_Load_MaxProfile( TT_Face face,
FT_Stream stream )
{
TT_Error error;
TT_MaxProfile* maxProfile = &face->max_profile;
FT_TRACE2(( "Load_TT_MaxProfile( %08lx )\n", (TT_Long)face ));
error = face->goto_table( face, TTAG_maxp, stream, 0 );
if (error) goto Exit;
if ( ACCESS_Frame( 32L ) )
goto Exit;
/* read frame data into face table */
maxProfile->version = GET_ULong();
maxProfile->numGlyphs = GET_UShort();
maxProfile->maxPoints = GET_UShort();
maxProfile->maxContours = GET_UShort();
maxProfile->maxCompositePoints = GET_UShort();
maxProfile->maxCompositeContours = GET_UShort();
maxProfile->maxZones = GET_UShort();
maxProfile->maxTwilightPoints = GET_UShort();
maxProfile->maxStorage = GET_UShort();
maxProfile->maxFunctionDefs = GET_UShort();
maxProfile->maxInstructionDefs = GET_UShort();
maxProfile->maxStackElements = GET_UShort();
maxProfile->maxSizeOfInstructions = GET_UShort();
maxProfile->maxComponentElements = GET_UShort();
maxProfile->maxComponentDepth = GET_UShort();
FORGET_Frame();
/* 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.max_points = MAX( maxProfile->maxCompositePoints,
maxProfile->maxPoints );
face->root.max_contours = MAX( maxProfile->maxCompositeContours,
maxProfile->maxContours );
face->max_components = (TT_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.max_points += 8;
face->root.max_contours += 4;
FT_TRACE2(( "MAXP loaded.\n" ));
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* TT_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> */
/* TrueType error code. 0 means success. */
/* */
static
TT_Error TT_Load_Metrics( TT_Face face,
FT_Stream stream,
TT_Bool vertical )
{
TT_Error error;
FT_Memory memory = stream->memory;
TT_ULong table_len;
TT_Long num_shorts, num_longs, num_shorts_checked;
TT_LongMetrics** longs;
TT_ShortMetrics** shorts;
FT_TRACE2(( "TT_Load_%s_Metrics( %08lx )\n",
vertical ? "Vertical" : "Horizontal", (TT_Long)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 the number_Of_VMetrics to 0! */
FT_TRACE2(( " no vertical header in file.\n" ));
face->vertical.number_Of_VMetrics = 0;
error = TT_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)
{
FT_ERROR(( " no horizontal metrics in file!\n" ));
error = TT_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(( "!! more metrics than glyphs!\n" ));
error = ( vertical ? TT_Err_Invalid_Vert_Metrics
: TT_Err_Invalid_Horiz_Metrics );
goto Exit;
}
if ( ALLOC_ARRAY( *longs, num_longs, TT_LongMetrics ) ||
ALLOC_ARRAY( *shorts, num_shorts, TT_ShortMetrics ) )
goto Exit;
if ( ACCESS_Frame( table_len ) )
goto Exit;
{
TT_LongMetrics* cur = *longs;
TT_LongMetrics* limit = cur + num_longs;
for ( ; cur < limit; cur++ )
{
cur->advance = GET_UShort();
cur->bearing = GET_Short();
}
}
/* do we have an inconsistent number of metric values ? */
{
TT_ShortMetrics* cur = *shorts;
TT_ShortMetrics* limit = cur + MIN( num_shorts, num_shorts_checked );
for ( ; cur < limit; cur++ )
*cur = GET_Short();
/* we fill up the missing left side bearings with the */
/* last valid value. Since this will occur for buggy CJK */
/* fonts usually, nothing serious will happen */
if ( num_shorts > num_shorts_checked && num_shorts_checked > 0 )
{
TT_Short val = *(shorts)[num_shorts_checked-1];
limit = *shorts + num_shorts;
for ( ; cur < limit; cur++ )
*cur = val;
}
}
FORGET_Frame();
FT_TRACE2(( "loaded\n" ));
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* TT_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> */
/* TrueType error code. 0 means success. */
/* */
LOCAL_FUNC
TT_Error TT_Load_Metrics_Header( TT_Face face,
FT_Stream stream,
TT_Bool vertical )
{
TT_Error error;
TT_HoriHeader* header;
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 = TT_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 = TT_Err_Horiz_Header_Missing;
goto Exit;
}
header = &face->horizontal;
}
if ( ACCESS_Frame( 36L ) )
goto Exit;
header->Version = GET_ULong();
header->Ascender = GET_Short();
header->Descender = GET_Short();
header->Line_Gap = GET_Short();
header->advance_Width_Max = GET_UShort();
header->min_Left_Side_Bearing = GET_Short();
header->min_Right_Side_Bearing = GET_Short();
header->xMax_Extent = GET_Short();
header->caret_Slope_Rise = GET_Short();
header->caret_Slope_Run = GET_Short();
header->Reserved[0] = GET_Short(); /* this is caret_Offset for
vertical headers */
header->Reserved[1] = GET_Short();
header->Reserved[2] = GET_Short();
header->Reserved[3] = GET_Short();
header->Reserved[4] = GET_Short();
header->metric_Data_Format = GET_Short();
header->number_Of_HMetrics = GET_UShort();
FORGET_Frame();
header->long_metrics = NULL;
header->short_metrics = NULL;
FT_TRACE2(( "loaded\n" ));
/* Now try to load the corresponding metrics */
error = TT_Load_Metrics( face, stream, vertical );
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* TT_Load_Names */
/* */
/* <Description> */
/* Loads the name records. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* stream :: The input stream. */
/* */
/* <Return> */
/* TrueType error code. 0 means success. */
/* */
LOCAL_FUNC
TT_Error TT_Load_Names( TT_Face face, FT_Stream stream )
{
TT_Error error;
FT_Memory memory = stream->memory;
TT_ULong table_pos, table_len;
TT_ULong storageSize;
TT_NameTable* names;
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 = TT_Err_Name_Table_Missing;
goto Exit;
}
table_pos = FILE_Pos();
if ( ACCESS_Frame( 6L ) )
goto Exit;
names = &face->name_table;
/* Load the initial names data. */
names->format = GET_UShort();
names->numNameRecords = GET_UShort();
names->storageOffset = GET_UShort();
FORGET_Frame();
/* Allocate the array of name records. */
if ( ALLOC_ARRAY( names->names,
names->numNameRecords,
TT_NameRec ) ||
ACCESS_Frame( names->numNameRecords * 12L ) )
goto Exit;
/* Load the name records and determine how much storage is needed */
/* to hold the strings themselves. */
{
TT_NameRec* cur = names->names;
TT_NameRec* limit = cur + names->numNameRecords;
storageSize = 0;
for ( ; cur < limit; cur ++ )
{
TT_ULong upper;
cur->platformID = GET_UShort();
cur->encodingID = GET_UShort();
cur->languageID = GET_UShort();
cur->nameID = GET_UShort();
cur->stringLength = GET_UShort();
cur->stringOffset = GET_UShort();
upper = (TT_ULong)(cur->stringOffset + cur->stringLength);
if ( upper > storageSize ) storageSize = upper;
}
}
FORGET_Frame();
if (storageSize > 0)
{
/* allocate the name storage area in memory, then read it */
if ( ALLOC( names->storage, storageSize ) ||
FILE_Read_At( table_pos + names->storageOffset,
(void*)names->storage, storageSize ) )
goto Exit;
/* Go through and assign the string pointers to the name records. */
{
TT_NameRec* cur = names->names;
TT_NameRec* limit = cur + names->numNameRecords;
for ( ; cur < limit; cur++ )
cur->string = names->storage + cur->stringOffset;
}
#ifdef FT_DEBUG_LEVEL_TRACE
/* Print Name Record Table in case of debugging */
{
TT_NameRec* cur = names->names;
TT_NameRec* limit = cur + names->numNameRecords;
for ( ; cur < limit; cur++ )
{
TT_UInt j;
FT_TRACE2(( "%d %d %x %d ",
cur->platformID,
cur->encodingID,
cur->languageID,
cur->nameID ));
/* I know that M$ encoded strings are Unicode, */
/* but this works reasonable well for debugging purposes. */
if ( cur->string )
for ( j = 0; j < cur->stringLength; j++ )
{
TT_Char c = *(cur->string + j);
if ( (TT_Byte)c < 128 )
FT_TRACE2(( "%c", c ));
}
}
}
FT_TRACE2(( "\n" ));
#endif
}
FT_TRACE2(( "loaded\n" ));
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* TT_Free_Names */
/* */
/* <Description> */
/* Frees the name records. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* */
LOCAL_FUNC
void TT_Free_Names( TT_Face face )
{
FT_Memory memory = face->root.driver->memory;
TT_NameTable* names = &face->name_table;
/* free strings table */
FREE( names->names );
/* free strings storage */
FREE( names->storage );
names->numNameRecords = 0;
names->format = 0;
names->storageOffset = 0;
}
/*************************************************************************/
/* */
/* <Function> */
/* TT_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> */
/* TrueType error code. 0 means success. */
/* */
LOCAL_FUNC
TT_Error TT_Load_CMap( TT_Face face,
FT_Stream stream )
{
TT_Error error;
FT_Memory memory = stream->memory;
TT_Long off, cur_off, table_start;
TT_CMapDir cmap_dir;
FT_TRACE2(( "CMaps " ));
error = face->goto_table( face, TTAG_cmap, stream, 0 );
if (error)
{
error = TT_Err_CMap_Table_Missing;
goto Exit;
}
table_start = FILE_Pos();
if ( ACCESS_Frame( 4L ) ) /* 4 bytes cmap header */
goto Exit;
cmap_dir.tableVersionNumber = GET_UShort();
cmap_dir.numCMaps = GET_UShort();
FORGET_Frame();
off = FILE_Pos(); /* save offset to cmapdir[] which follows */
/* save space in face table for cmap tables */
if ( ALLOC_ARRAY( face->charmaps,
cmap_dir.numCMaps,
TT_CharMapRec ) )
goto Exit;
face->num_charmaps = cmap_dir.numCMaps;
{
TT_CharMap charmap = face->charmaps;
TT_CharMap limit = charmap + face->num_charmaps;
for ( ; charmap < limit; charmap++ )
{
TT_CMapTable* cmap;
charmap->root.face = (FT_Face)face;
cmap = &charmap->cmap;
if ( FILE_Seek( off ) ||
ACCESS_Frame( 8L ) )
goto Exit;
cmap->loaded = FALSE;
cmap->platformID = GET_UShort();
cmap->platformEncodingID = GET_UShort();
cur_off = GET_Long();
FORGET_Frame();
off = FILE_Pos();
if ( FILE_Seek( table_start + cur_off ) ||
ACCESS_Frame( 6L ) )
goto Exit;
cmap->format = GET_UShort();
cmap->length = GET_UShort();
cmap->version = GET_UShort();
FORGET_Frame();
cmap->offset = FILE_Pos();
charmap++;
}
}
FT_TRACE2(( "loaded\n" ));
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* TT_Load_OS2 */
/* */
/* <Description> */
/* Loads the OS2 table. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* stream :: A handle to the input stream. */
/* */
/* <Return> */
/* TrueType error code. 0 means success. */
/* */
LOCAL_FUNC
TT_Error TT_Load_OS2( TT_Face face,
FT_Stream stream )
{
TT_Error error;
TT_Int j;
TT_OS2* os2;
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 = 0xFFFF;
error = TT_Err_Ok;
goto Exit;
}
if ( ACCESS_Frame( 78L ) )
goto Exit;
os2 = &face->os2;
os2->version = GET_UShort();
os2->xAvgCharWidth = GET_Short();
os2->usWeightClass = GET_UShort();
os2->usWidthClass = GET_UShort();
os2->fsType = GET_Short();
os2->ySubscriptXSize = GET_Short();
os2->ySubscriptYSize = GET_Short();
os2->ySubscriptXOffset = GET_Short();
os2->ySubscriptYOffset = GET_Short();
os2->ySuperscriptXSize = GET_Short();
os2->ySuperscriptYSize = GET_Short();
os2->ySuperscriptXOffset = GET_Short();
os2->ySuperscriptYOffset = GET_Short();
os2->yStrikeoutSize = GET_Short();
os2->yStrikeoutPosition = GET_Short();
os2->sFamilyClass = GET_Short();
for ( j = 0; j < 10; j++ )
os2->panose[j] = GET_Byte();
os2->ulUnicodeRange1 = GET_ULong();
os2->ulUnicodeRange2 = GET_ULong();
os2->ulUnicodeRange3 = GET_ULong();
os2->ulUnicodeRange4 = GET_ULong();
for ( j = 0; j < 4; j++ )
os2->achVendID[j] = GET_Byte();
os2->fsSelection = GET_UShort();
os2->usFirstCharIndex = GET_UShort();
os2->usLastCharIndex = GET_UShort();
os2->sTypoAscender = GET_Short();
os2->sTypoDescender = GET_Short();
os2->sTypoLineGap = GET_Short();
os2->usWinAscent = GET_UShort();
os2->usWinDescent = GET_UShort();
FORGET_Frame();
os2->ulCodePageRange1 = 0;
os2->ulCodePageRange2 = 0;
if ( os2->version >= 0x0001 )
{
/* only version 1 tables */
if ( ACCESS_Frame( 8L ) ) /* read into frame */
goto Exit;
os2->ulCodePageRange1 = GET_ULong();
os2->ulCodePageRange2 = GET_ULong();
FORGET_Frame();
}
FT_TRACE2(( "loaded\n" ));
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* TT_Load_Postscript */
/* */
/* <Description> */
/* Loads the Postscript table. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* stream :: A handle to the input stream. */
/* */
/* <Return> */
/* TrueType error code. 0 means success. */
/* */
LOCAL_FUNC
TT_Error TT_Load_PostScript( TT_Face face,
FT_Stream stream )
{
TT_Error error;
TT_Postscript* post = &face->postscript;
FT_TRACE2(( "PostScript " ));
error = face->goto_table( face, TTAG_post, stream, 0 );
if (error)
return TT_Err_Post_Table_Missing;
if ( ACCESS_Frame( 32L ) )
return error;
/* read frame data into face table */
post->FormatType = GET_ULong();
post->italicAngle = GET_ULong();
post->underlinePosition = GET_Short();
post->underlineThickness = GET_Short();
post->isFixedPitch = GET_ULong();
post->minMemType42 = GET_ULong();
post->maxMemType42 = GET_ULong();
post->minMemType1 = GET_ULong();
post->maxMemType1 = GET_ULong();
FORGET_Frame();
/* we don't load the glyph names, we do that in another */
/* module (ttpost). */
FT_TRACE2(( "loaded\n" ));
return TT_Err_Ok;
}
/*************************************************************************/
/* */
/* <Function> */
/* TT_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> */
/* TrueType error code. 0 means success. */
/* */
LOCAL_FUNC
TT_Error TT_Load_Gasp( TT_Face face,
FT_Stream stream )
{
TT_Error error;
FT_Memory memory = stream->memory;
TT_UInt j,num_ranges;
TT_GaspRange* gaspranges;
FT_TRACE2(( "TT_Load_Gasp( %08lx )\n", (TT_Long)face ));
/* the gasp table is optional */
error = face->goto_table( face, TTAG_gasp, stream, 0 );
if (error) return TT_Err_Ok;
if ( ACCESS_Frame( 4L ) )
goto Exit;
face->gasp.version = GET_UShort();
face->gasp.numRanges = GET_UShort();
FORGET_Frame();
num_ranges = face->gasp.numRanges;
FT_TRACE3(( "number of ranges = %d\n", num_ranges ));
if ( ALLOC_ARRAY( gaspranges, num_ranges, TT_GaspRange ) ||
ACCESS_Frame( num_ranges * 4L ) )
goto Exit;
face->gasp.gaspRanges = gaspranges;
for ( j = 0; j < num_ranges; j++ )
{
gaspranges[j].maxPPEM = GET_UShort();
gaspranges[j].gaspFlag = GET_UShort();
FT_TRACE3(( " [max:%d flag:%d]",
gaspranges[j].maxPPEM,
gaspranges[j].gaspFlag ));
}
FT_TRACE3(( "\n" ));
FORGET_Frame();
FT_TRACE2(( "GASP loaded\n" ));
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* TT_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> */
/* TrueType error code. 0 means success. */
/* */
LOCAL_FUNC
TT_Error TT_Load_Kern( TT_Face face,
FT_Stream stream )
{
TT_Error error;
FT_Memory memory = stream->memory;
TT_UInt n, num_tables, version;
/* the kern table is optional. exit silently if it's missing */
error = face->goto_table( face, TTAG_kern, stream, 0 );
if ( error ) return TT_Err_Ok;
if ( ACCESS_Frame( 4L ) ) goto Exit;
version = GET_UShort();
num_tables = GET_UShort();
FORGET_Frame();
for ( n = 0; n < num_tables; n++ )
{
TT_UInt coverage;
TT_UInt length;
if ( ACCESS_Frame( 6L ) ) goto Exit;
version = GET_UShort(); /* version */
length = GET_UShort() - 6; /* substract header length */
coverage = GET_UShort();
FORGET_Frame();
if ( coverage == 0x0001 )
{
TT_UInt num_pairs;
TT_Kern_0_Pair* pair;
TT_Kern_0_Pair* limit;
/* found a horizontal format 0 kerning table ! */
if ( ACCESS_Frame(8L) )
goto Exit;
num_pairs = GET_UShort();
/* skip the rest */
FORGET_Frame();
/* allocate array of kerning pairs */
if ( ALLOC_ARRAY( face->kern_pairs, num_pairs, TT_Kern_0_Pair ) ||
ACCESS_Frame( 6L * num_pairs ) )
goto Exit;
pair = face->kern_pairs;
limit = pair + num_pairs;
for ( ; pair < limit; pair++ )
{
pair->left = GET_UShort();
pair->right = GET_UShort();
pair->value = GET_UShort();
}
FORGET_Frame();
face->num_kern_pairs = num_pairs;
face->kern_table_index = n;
goto Exit;
}
if ( FILE_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;
}
/*************************************************************************/
/* */
/* <Function> */
/* TT_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> */
/* TrueType error code. 0 means success. */
/* */
LOCAL_FUNC
TT_Error TT_Load_Hdmx( TT_Face face,
FT_Stream stream )
{
TT_Error error;
FT_Memory memory = stream->memory;
TT_Hdmx* hdmx = &face->hdmx;
TT_Long num_glyphs;
TT_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 ( ACCESS_Frame( 8L ) ) goto Exit;
hdmx->version = GET_UShort();
hdmx->num_records = GET_Short();
record_size = GET_Long();
FORGET_Frame();
/* Only recognize format 0 */
if ( hdmx->version != 0 )
goto Exit;
if ( ALLOC_ARRAY( hdmx->records, hdmx->num_records, TT_HdmxRec ) )
goto Exit;
num_glyphs = face->root.num_glyphs;
record_size -= num_glyphs + 2;
{
TT_HdmxRec* cur = hdmx->records;
TT_HdmxRec* limit = cur + hdmx->num_records;
for ( ; cur < limit; cur++ )
{
/* read record */
if ( READ_Byte( cur->ppem ) ||
READ_Byte( cur->max_width ) )
goto Exit;
if ( ALLOC( cur->widths, num_glyphs ) ||
FILE_Read( cur->widths, num_glyphs ) )
goto Exit;
/* skip padding bytes */
if ( record_size > 0 && FILE_Skip(record_size) )
goto Exit;
}
}
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* TT_Free_Hdmx */
/* */
/* <Description> */
/* Frees the horizontal device metrics table. */
/* */
/* <Input> */
/* face :: A handle to the target face object. */
/* */
LOCAL_FUNC
void TT_Free_Hdmx( TT_Face face )
{
if ( face )
{
TT_Int n;
FT_Memory memory = face->root.driver->memory;
for ( n = 0; n < face->hdmx.num_records; n++ )
FREE( face->hdmx.records[n].widths );
FREE( face->hdmx.records );
face->hdmx.num_records = 0;
}
}
/* END */