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5edbb7a80a158583a81de286b7fcc5392916ba38
freetype/lib/ttload.c
mnerv 5edbb7a80a FreeType 1.31.1
2023-08-27 18:03:45 +02:00

1575 lines
40 KiB
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/*******************************************************************
*
* ttload.c 1.0
*
* TrueType Tables Loader.
*
* 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.
*
******************************************************************/
#include "tttypes.h"
#include "ttdebug.h"
#include "ttcalc.h"
#include "ttfile.h"
#include "tttables.h"
#include "ttobjs.h"
#include "ttmemory.h"
#include "tttags.h"
#include "ttload.h"
/* required by the tracing mode */
#undef TT_COMPONENT
#define TT_COMPONENT trace_load
/* In all functions, the stream is taken from the 'face' object */
#define DEFINE_LOCALS DEFINE_LOAD_LOCALS( face->stream )
#define DEFINE_LOCALS_WO_FRAME DEFINE_LOAD_LOCALS_WO_FRAME( face->stream )
/*******************************************************************
*
* Function : LookUp_TrueType_Table
*
* Description : Looks for a TrueType table by name.
*
* Input : face face table to look for
* tag searched tag
*
* Output : Index of table if found, -1 otherwise.
*
******************************************************************/
EXPORT_FUNC
Long TT_LookUp_Table( PFace face,
ULong tag )
{
UShort i;
PTRACE4(( "TT_LookUp_Table( %08lx, %c%c%c%c )\n",
(Long)face,
(Char)(tag >> 24),
(Char)(tag >> 16),
(Char)(tag >> 8),
(Char)(tag) ));
for ( i = 0; i < face->numTables; i++ )
if ( face->dirTables[i].Tag == tag )
return i;
PTRACE4(( " Could not find table!\n" ));
return -1;
}
/*******************************************************************
*
* Function : Load_TrueType_Collection
*
* Description : Loads the TTC table directory into face table.
*
* Input : face face record to look for
*
* Output : Error code.
*
******************************************************************/
static TT_Error Load_TrueType_Collection( PFace face )
{
DEFINE_LOCALS;
ULong n;
PTRACE3(( "Load_TrueType_Collection( %08lx )\n", (long)face ));
if ( FILE_Seek ( 0L ) ||
ACCESS_Frame( 12L ) )
return error;
face->ttcHeader.Tag = GET_Tag4();
face->ttcHeader.version = GET_Long();
face->ttcHeader.DirCount = GET_Long();
FORGET_Frame();
if ( face->ttcHeader.Tag != TTAG_ttcf )
{
face->ttcHeader.Tag = 0;
face->ttcHeader.version = 0;
face->ttcHeader.DirCount = 0;
face->ttcHeader.TableDirectory = NULL;
PTRACE3(("skipped.\n"));
return TT_Err_File_Is_Not_Collection;
}
if ( ALLOC_ARRAY( face->ttcHeader.TableDirectory,
face->ttcHeader.DirCount,
ULong ) ||
ACCESS_Frame( face->ttcHeader.DirCount * 4L ) )
return error;
for ( n = 0; n < face->ttcHeader.DirCount; n++ )
face->ttcHeader.TableDirectory[n] = GET_ULong();
FORGET_Frame();
PTRACE3(( "collections directory loaded.\n" ));
return TT_Err_Ok;
}
/*******************************************************************
*
* Function : Load_TrueType_Directory
*
* Description : Loads the table directory into face table.
*
* Input : face face record to look for
*
* faceIndex the index of the TrueType font, when
* we're opening a collection.
*
* Output : SUCCESS on success. FAILURE on error.
*
******************************************************************/
LOCAL_FUNC
TT_Error Load_TrueType_Directory( PFace face, ULong faceIndex )
{
DEFINE_LOCALS;
UShort n, limit;
TTableDir tableDir;
PTableDirEntry entry;
PTRACE2(("Load_TT_Directory( %08lx, %ld )\n", (long)face, faceIndex));
error = Load_TrueType_Collection( face );
if ( error )
{
if ( error != TT_Err_File_Is_Not_Collection )
return error;
/* the file isn't a collection, exit if we're asking */
/* for a collected font */
if ( faceIndex != 0 )
return error;
/* Now skip to the beginning of the file */
if ( FILE_Seek( 0L ) )
return error;
}
else
{
/* The file is a collection. Check the font index */
if ( faceIndex >= face->ttcHeader.DirCount )
return TT_Err_Invalid_Argument;
/* select a TrueType font in the ttc file */
if ( FILE_Seek( face->ttcHeader.TableDirectory[faceIndex] ) )
return error;
}
if ( ACCESS_Frame( 12L ) )
return error;
tableDir.version = GET_Long();
tableDir.numTables = GET_UShort();
tableDir.searchRange = GET_UShort();
tableDir.entrySelector = GET_UShort();
tableDir.rangeShift = GET_UShort();
FORGET_Frame();
PTRACE2(( "-- Tables count : %12u\n", tableDir.numTables ));
PTRACE2(( "-- Format version : %08lx\n", tableDir.version ));
/* Check that we have a 'sfnt' format there */
if ( tableDir.version != 0x00010000 && /* MS fonts */
tableDir.version != 0x74727565 && /* Mac fonts */
tableDir.version != 0x00000000 ) /* some Korean fonts */
{
PERROR(( "!! invalid file format" ));
return TT_Err_Invalid_File_Format;
}
face->numTables = tableDir.numTables;
if ( ALLOC_ARRAY( face->dirTables,
face->numTables,
TTableDirEntry ) )
return error;
if ( ACCESS_Frame( face->numTables * 16L ) )
return error;
limit = face->numTables;
entry = face->dirTables;
for ( n = 0; n < limit; n++ )
{ /* loop through the tables and get all entries */
entry->Tag = GET_Tag4();
entry->CheckSum = GET_ULong();
entry->Offset = GET_Long();
entry->Length = GET_Long();
PTRACE2(( " %c%c%c%c - %08lx - %08lx\n",
(Char)(entry->Tag >> 24),
(Char)(entry->Tag >> 16),
(Char)(entry->Tag >> 8 ),
(Char)(entry->Tag),
entry->Offset,
entry->Length ));
entry++;
}
FORGET_Frame();
PTRACE2(( "Directory loaded\n\n" ));
return TT_Err_Ok;
}
/*******************************************************************
*
* Function : Load_TrueType_MaxProfile
*
* Description : Loads the maxp table into face table.
*
* Input : face face table to look for
*
* Output : Error code.
*
******************************************************************/
LOCAL_FUNC
TT_Error Load_TrueType_MaxProfile( PFace face )
{
DEFINE_LOCALS;
Long i;
PMaxProfile maxProfile = &face->maxProfile;
PTRACE2(( "Load_TT_MaxProfile( %08lx )\n", (long)face ));
if ( ( i = TT_LookUp_Table( face, TTAG_maxp ) ) < 0 )
return TT_Err_Max_Profile_Missing;
if ( FILE_Seek( face->dirTables[i].Offset ) ) /* seek to maxprofile */
return error;
if ( ACCESS_Frame( 32L ) ) /* read into frame */
return error;
/* 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 adjustement 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->numGlyphs = maxProfile->numGlyphs;
face->maxPoints = MAX( maxProfile->maxCompositePoints,
maxProfile->maxPoints );
face->maxContours = MAX( maxProfile->maxCompositeContours,
maxProfile->maxContours );
face->maxComponents = maxProfile->maxComponentElements +
maxProfile->maxComponentDepth;
/* XXX: Some fonts have maxComponents set to 0; we will */
/* then use 16 of them by default. */
if ( face->maxComponents == 0 )
face->maxComponents = 16;
/* We also increase maxPoints and maxContours in order to support */
/* some broken fonts. */
face->maxPoints += 8;
face->maxContours += 4;
PTRACE2(( "GASP loaded.\n" ));
return TT_Err_Ok;
}
/*******************************************************************
*
* Function : Load_TrueType_Gasp
*
* Description : Loads the TrueType Gasp table into the face
* table.
*
* Input : face face table to look for
*
* Output : Error code.
*
******************************************************************/
LOCAL_FUNC
TT_Error Load_TrueType_Gasp( PFace face )
{
DEFINE_LOCALS;
Long i;
UShort j;
TGasp* gas;
GaspRange* gaspranges;
PTRACE2(( "Load_TT_Gasp( %08lx )\n", (long)face ));
if ( ( i = TT_LookUp_Table( face, TTAG_gasp ) ) < 0 )
return TT_Err_Ok; /* gasp table is not required */
if ( FILE_Seek( face->dirTables[i].Offset ) ||
ACCESS_Frame( 4L ) )
return error;
gas = &face->gasp;
gas->version = GET_UShort();
gas->numRanges = GET_UShort();
FORGET_Frame();
PTRACE3(( "number of ranges = %d\n", gas->numRanges ));
if ( ALLOC_ARRAY( gaspranges, gas->numRanges, GaspRange ) ||
ACCESS_Frame( gas->numRanges * 4L ) )
goto Fail;
face->gasp.gaspRanges = gaspranges;
for ( j = 0; j < gas->numRanges; j++ )
{
gaspranges[j].maxPPEM = GET_UShort();
gaspranges[j].gaspFlag = GET_UShort();
PTRACE3(( " [max:%d flag:%d]",
gaspranges[j].maxPPEM,
gaspranges[j].gaspFlag ));
}
PTRACE3(("\n"));
FORGET_Frame();
PTRACE2(( "GASP loaded\n" ));
return TT_Err_Ok;
Fail:
FREE( gaspranges );
gas->numRanges = 0;
return error;
}
/*******************************************************************
*
* Function : Load_TrueType_Header
*
* Description : Loads the TrueType header table into the face
* table.
*
* Input : face face table to look for
*
* Output : Error code.
*
******************************************************************/
LOCAL_FUNC
TT_Error Load_TrueType_Header( PFace face )
{
DEFINE_LOCALS;
Long i;
TT_Header* header;
PTRACE2(( "Load_TT_Header( %08lx )\n", (long)face ));
if ( ( i = TT_LookUp_Table( face, TTAG_head ) ) < 0 )
{
PTRACE0(( "Font Header is missing !!\n" ));
return TT_Err_Header_Table_Missing;
}
if ( FILE_Seek( face->dirTables[i].Offset ) ||
ACCESS_Frame( 54L ) )
return error;
header = &face->fontHeader;
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();
PTRACE2(( " Units per EM : %8u\n", header->Units_Per_EM ));
PTRACE2(( " IndexToLoc : %8d\n", header->Index_To_Loc_Format ));
PTRACE2(( "Font Header Loaded.\n" ));
return TT_Err_Ok;
}
/*******************************************************************
*
* Function : Load_TrueType_Metrics
*
* Description : Loads the horizontal or vertical metrics table
* into face object.
*
* Input : face
* vertical set to true when loading the vmtx table,
* or false for hmtx
*
* Output : Error code.
*
******************************************************************/
static
TT_Error Load_TrueType_Metrics( PFace face,
Bool vertical )
{
DEFINE_LOCALS;
Long n, num_shorts, num_shorts_checked, num_longs;
PLongMetrics* longs;
PShortMetrics* shorts;
PLongMetrics long_metric;
PTRACE2(( "Load_TT_%s_Metrics( %08lx )\n",
vertical ? "Vertical" : "Horizontal",
(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 ! */
/* */
n = TT_LookUp_Table( face, TTAG_vmtx );
if ( n < 0 )
{
/* Set the number_Of_VMetrics to 0! */
PTRACE2(( " no vertical header in file.\n" ));
face->verticalHeader.number_Of_VMetrics = 0;
return TT_Err_Ok;
}
num_longs = face->verticalHeader.number_Of_VMetrics;
longs = (PLongMetrics*)&face->verticalHeader.long_metrics;
shorts = (PShortMetrics*)&face->verticalHeader.short_metrics;
}
else
{
if ( ( n = TT_LookUp_Table( face, TTAG_hmtx ) ) < 0 )
{
PERROR(( "!! No Horizontal metrics in file !!\n" ));
return TT_Err_Hmtx_Table_Missing;
}
num_longs = face->horizontalHeader.number_Of_HMetrics;
longs = (PLongMetrics*)&face->horizontalHeader.long_metrics;
shorts = (PShortMetrics*)&face->horizontalHeader.short_metrics;
}
/* never trust derived values! */
num_shorts = face->maxProfile.numGlyphs - num_longs;
num_shorts_checked = ( face->dirTables[n].Length - num_longs * 4 ) / 2;
if ( num_shorts < 0 ) /* sanity check */
{
PERROR(( "!! more metrics than glyphs!\n" ));
if ( vertical )
return TT_Err_Invalid_Vert_Metrics;
else
return TT_Err_Invalid_Horiz_Metrics;
}
if ( ALLOC_ARRAY( *longs, num_longs, TLongMetrics ) ||
ALLOC_ARRAY( *shorts, num_shorts, TShortMetrics ) )
return error;
if ( FILE_Seek( face->dirTables[n].Offset ) ||
ACCESS_Frame( face->dirTables[n].Length ) )
return error;
long_metric = *longs;
for ( n = 0; n < num_longs; n++ )
{
long_metric->advance = GET_UShort();
long_metric->bearing = GET_Short();
long_metric++;
}
/* do we have an inconsistent number of metric values? */
if ( num_shorts > num_shorts_checked )
{
for ( n = 0; n < num_shorts_checked; n++ )
(*shorts)[n] = 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. */
for ( n = num_shorts_checked; n < num_shorts; n++ )
(*shorts)[n] = (*shorts)[num_shorts_checked - 1];
}
else
{
for ( n = 0; n < num_shorts; n++ )
(*shorts)[n] = GET_Short();
}
FORGET_Frame();
PTRACE2(( "loaded\n" ));
return TT_Err_Ok;
}
/*******************************************************************
*
* Function : Load_TrueType_Metrics_Header
*
* Description : Loads either the "hhea" or "vhea" table in memory
*
* Input : face face table to look for
* vertical a boolean. When set, queries the optional
* "vhea" table. Otherwise, load the mandatory
* "hhea" horizontal header.
*
* Output : Error code.
*
* Note : This function now loads the corresponding metrics table
* (either hmtx or vmtx) and attaches it to the header.
*
******************************************************************/
LOCAL_FUNC
TT_Error Load_TrueType_Metrics_Header( PFace face,
Bool vertical )
{
DEFINE_LOCALS;
Long i;
TT_Horizontal_Header* header;
PTRACE2(( vertical ? "Vertical header" : "Horizontal header " ));
if ( vertical )
{
face->verticalInfo = 0;
/* The vertical header table is optional, so return quietly if */
/* we don't find it.. */
if ( ( i = TT_LookUp_Table( face, TTAG_vhea ) ) < 0 )
return TT_Err_Ok;
face->verticalInfo = 1;
header = (TT_Horizontal_Header*)&face->verticalHeader;
}
else
{
/* The orizontal header is mandatory, return an error if we */
/* don't find it. */
if ( ( i = TT_LookUp_Table( face, TTAG_hhea ) ) < 0 )
return TT_Err_Horiz_Header_Missing;
header = &face->horizontalHeader;
}
if ( FILE_Seek( face->dirTables[i].Offset ) ||
ACCESS_Frame( 36L ) )
return error;
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->Reserved0 = GET_Short(); /* this is caret_Offset for
vertical headers */
header->Reserved1 = GET_Short();
header->Reserved2 = GET_Short();
header->Reserved3 = GET_Short();
header->Reserved4 = GET_Short();
header->metric_Data_Format = GET_Short();
header->number_Of_HMetrics = GET_UShort();
FORGET_Frame();
header->long_metrics = NULL;
header->short_metrics = NULL;
PTRACE2(( "loaded\n" ));
/* Now try to load the corresponding metrics */
return Load_TrueType_Metrics( face, vertical );
}
/*******************************************************************
*
* Function : Load_TrueType_Locations
*
* Description : Loads the location table into face table.
*
* Input : face face table to look for
*
* Output : Error code.
*
* NOTE:
* The Font Header *must* be loaded in the leading segment
* calling this function.
*
******************************************************************/
LOCAL_FUNC
TT_Error Load_TrueType_Locations( PFace face )
{
DEFINE_LOCALS;
Long n, limit;
Short LongOffsets;
PTRACE2(( "Locations " ));
LongOffsets = face->fontHeader.Index_To_Loc_Format;
if ( ( n = TT_LookUp_Table( face, TTAG_loca ) ) < 0 )
return TT_Err_Locations_Missing;
if ( FILE_Seek( face->dirTables[n].Offset ) )
return error;
if ( LongOffsets != 0 )
{
face->numLocations = face->dirTables[n].Length >> 2;
PTRACE2(( "(32 bit offsets): %12lu ",
face->numLocations ));
if ( ALLOC_ARRAY( face->glyphLocations,
face->numLocations,
Long ) )
return error;
if ( ACCESS_Frame( face->numLocations * 4L ) )
return error;
limit = face->numLocations;
for ( n = 0; n < limit; n++ )
face->glyphLocations[n] = GET_Long();
FORGET_Frame();
}
else
{
face->numLocations = face->dirTables[n].Length >> 1;
PTRACE2(( "(16 bit offsets): %12lu ",
face->numLocations ));
if ( ALLOC_ARRAY( face->glyphLocations,
face->numLocations,
Long ) )
return error;
if ( ACCESS_Frame( face->numLocations * 2L ) )
return error;
limit = face->numLocations;
for ( n = 0; n < limit; n++ )
face->glyphLocations[n] =
(Long)((ULong)GET_UShort() * 2);
FORGET_Frame();
}
PTRACE2(( "loaded\n" ));
return TT_Err_Ok;
}
/*******************************************************************
*
* Function : Load_TrueType_Names
*
* Description : Loads the name table into face table.
*
* Input : face face table to look for
*
* Output : Error code.
*
******************************************************************/
LOCAL_FUNC
TT_Error Load_TrueType_Names( PFace face )
{
DEFINE_LOCALS;
UShort i, bytes;
Long n;
PByte storage;
TName_Table* names;
TNameRec* namerec;
PTRACE2(( "Names " ));
if ( ( n = TT_LookUp_Table( face, TTAG_name ) ) < 0 )
{
/* The name table is required so indicate failure. */
PTRACE2(( "is missing!\n" ));
return TT_Err_Name_Table_Missing;
}
/* Seek to the beginning of the table and check the frame access. */
/* The names table has a 6 byte header. */
if ( FILE_Seek( face->dirTables[n].Offset ) ||
ACCESS_Frame( 6L ) )
return error;
names = &face->nameTable;
/* 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,
TNameRec ) ||
ACCESS_Frame( names->numNameRecords * 12L ) )
{
names->numNameRecords = 0;
goto Fail;
}
/* Load the name records and determine how much storage is needed */
/* to hold the strings themselves. */
for ( i = bytes = 0; i < names->numNameRecords; i++ )
{
namerec = names->names + i;
namerec->platformID = GET_UShort();
namerec->encodingID = GET_UShort();
namerec->languageID = GET_UShort();
namerec->nameID = GET_UShort();
namerec->stringLength = GET_UShort();
namerec->stringOffset = GET_UShort();
#if 0
/* check the ids */
if ( namerec->platformID <= 3 )
{
#endif
/* this test takes care of 'holes' in the names tables, as */
/* reported by Erwin */
if ( (namerec->stringOffset + namerec->stringLength) > bytes )
bytes = namerec->stringOffset + namerec->stringLength;
#if 0
}
#endif
}
FORGET_Frame();
/* Allocate storage for the strings if they exist. */
names->storage = NULL;
if ( bytes > 0 )
{
if ( ALLOC( storage, bytes ) ||
FILE_Read_At( face->dirTables[n].Offset + names->storageOffset,
(void*)storage,
bytes ) )
goto Fail_Storage;
names->storage = storage;
/* Go through and assign the string pointers to the name records. */
for ( i = 0; i < names->numNameRecords; i++ )
{
namerec = names->names + i;
namerec->string = storage + names->names[i].stringOffset;
/* It is possible (but rather unlikely) that a new platform ID will be */
/* added by Apple, so we can't rule out IDs > 3. */
#if 0
if ( namerec->platformID <= 3 )
namerec->string = storage + names->names[i].stringOffset;
else
{
namerec->string = NULL;
namerec->stringLength = 0;
}
#endif
}
}
#ifdef DEBUG_LEVEL_TRACE
for ( i = 0; i < names->numNameRecords; i++ )
{
int j;
PTRACE2(( "%d %d %x %d ",
names->names[i].platformID,
names->names[i].encodingID,
names->names[i].languageID,
names->names[i].nameID ));
/* I know that M$ encoded strings are Unicode, */
/* but this works reasonable well for debugging purposes. */
for ( j = 0; j < names->names[i].stringLength; j++ )
{
if (names->names[i].string)
{
Char c = *(names->names[i].string + j);
if ( (Byte)c < 128 )
PTRACE2(( "%c", c ));
}
}
PTRACE2(( "\n" ));
}
#endif /* DEBUG_LEVEL_TRACE */
PTRACE2(( "loaded\n" ));
return TT_Err_Ok;
Fail_Storage:
FREE( storage );
Fail:
Free_TrueType_Names( face );
return error;
}
/*******************************************************************
*
* Function : Free_TrueType_Names
*
* Description : Frees a name table.
*
* Input : face face table to look for
*
* Output : TT_Err_Ok.
*
******************************************************************/
LOCAL_FUNC
TT_Error Free_TrueType_Names( PFace face )
{
TName_Table* names = &face->nameTable;
/* free strings table */
FREE( names->names );
/* free strings storage */
FREE( names->storage );
names->numNameRecords = 0;
names->format = 0;
names->storageOffset = 0;
return TT_Err_Ok;
}
/*******************************************************************
*
* Function : Load_TrueType_CVT
*
* Description : Loads cvt table into resident table.
*
* Input : face face table to look for
*
* Output : Error code.
*
******************************************************************/
LOCAL_FUNC
TT_Error Load_TrueType_CVT( PFace face )
{
DEFINE_LOCALS;
Long n, limit;
PTRACE2(( "CVT " ));
if ( ( n = TT_LookUp_Table( face, TTAG_cvt ) ) < 0 )
{
PTRACE2(( "is missing!\n" ));
face->cvtSize = 0;
face->cvt = NULL;
return TT_Err_Ok;
}
face->cvtSize = face->dirTables[n].Length / 2;
if ( ALLOC_ARRAY( face->cvt,
face->cvtSize,
Short ) )
return error;
if ( FILE_Seek( face->dirTables[n].Offset ) ||
ACCESS_Frame( face->cvtSize * 2L ) )
return error;
limit = face->cvtSize;
for ( n = 0; n < limit; n++ )
face->cvt[n] = GET_Short();
FORGET_Frame();
PTRACE2(( "loaded\n" ));
return TT_Err_Ok;
}
/*******************************************************************
*
* Function : Load_TrueType_CMap
*
* Description : Loads the cmap directory in memory.
* The cmaps themselves are loaded in ttcmap.c .
*
* Input : face
*
* Output : Error code.
*
******************************************************************/
LOCAL_FUNC
TT_Error Load_TrueType_CMap( PFace face )
{
DEFINE_LOCALS;
Long off, table_start;
Long n, limit;
TCMapDir cmap_dir;
TCMapDirEntry entry_;
PCMapTable cmap;
PTRACE2(( "CMaps " ));
if ( ( n = TT_LookUp_Table( face, TTAG_cmap ) ) < 0 )
return TT_Err_CMap_Table_Missing;
table_start = face->dirTables[n].Offset;
if ( ( FILE_Seek( table_start ) ) ||
( ACCESS_Frame( 4L ) ) ) /* 4 bytes cmap header */
return error;
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->cMaps,
cmap_dir.numCMaps,
TCMapTable ) )
return error;
face->numCMaps = cmap_dir.numCMaps;
limit = face->numCMaps;
cmap = face->cMaps;
for ( n = 0; n < limit; n++ )
{
if ( FILE_Seek( off ) ||
ACCESS_Frame( 8L ) )
return error;
/* extra code using entry_ for platxxx could be cleaned up later */
cmap->loaded = FALSE;
cmap->platformID = entry_.platformID = GET_UShort();
cmap->platformEncodingID = entry_.platformEncodingID = GET_UShort();
entry_.offset = GET_Long();
FORGET_Frame();
off = FILE_Pos();
if ( FILE_Seek( table_start + entry_.offset ) ||
ACCESS_Frame( 6L ) )
return error;
cmap->format = GET_UShort();
cmap->length = GET_UShort();
cmap->version = GET_UShort();
FORGET_Frame();
cmap->offset = FILE_Pos();
cmap++;
}
PTRACE2(( "loaded\n" ));
return TT_Err_Ok;
}
/*******************************************************************
*
* Function : Load_TrueType_Programs
*
* Description : Loads the font (fpgm) and cvt programs into the
* face table.
*
* Input : face
*
* Output : Error code.
*
******************************************************************/
LOCAL_FUNC
TT_Error Load_TrueType_Programs( PFace face )
{
DEFINE_LOCALS_WO_FRAME;
Long n;
PTRACE2(( "Font program " ));
/* The font program is optional */
if ( ( n = TT_LookUp_Table( face, TTAG_fpgm ) ) < 0 )
{
face->fontProgram = NULL;
face->fontPgmSize = 0;
PTRACE2(( "is missing!\n" ));
}
else
{
face->fontPgmSize = face->dirTables[n].Length;
if ( ALLOC( face->fontProgram,
face->fontPgmSize ) ||
FILE_Read_At( face->dirTables[n].Offset,
(void*)face->fontProgram,
face->fontPgmSize ) )
return error;
PTRACE2(( "loaded, %12d bytes\n", face->fontPgmSize ));
}
PTRACE2(( "Prep program " ));
if ( ( n = TT_LookUp_Table( face, TTAG_prep ) ) < 0 )
{
face->cvtProgram = NULL;
face->cvtPgmSize = 0;
PTRACE2(( "is missing!\n" ));
}
else
{
face->cvtPgmSize = face->dirTables[n].Length;
if ( ALLOC( face->cvtProgram,
face->cvtPgmSize ) ||
FILE_Read_At( face->dirTables[n].Offset,
(void*)face->cvtProgram,
face->cvtPgmSize ) )
return error;
PTRACE2(( "loaded, %12d bytes\n", face->cvtPgmSize ));
}
return TT_Err_Ok;
}
/*******************************************************************
*
* Function : Load_TrueType_OS2
*
* Description : Loads the OS2 Table.
*
* Input : face
*
* Output : Error code.
*
******************************************************************/
LOCAL_FUNC
TT_Error Load_TrueType_OS2( PFace face )
{
DEFINE_LOCALS;
Long i;
TT_OS2* os2;
PTRACE2(( "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. */
if ( ( i = TT_LookUp_Table( face, TTAG_OS2 ) ) < 0 )
{
PTRACE2(( "is missing\n!" ));
face->os2.version = 0xFFFF;
error = TT_Err_Ok;
return TT_Err_Ok;
}
if ( FILE_Seek( face->dirTables[i].Offset ) ||
ACCESS_Frame( 78L ) )
return error;
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 ( i = 0; i < 10; i++ )
os2->panose[i] = GET_Byte();
os2->ulUnicodeRange1 = GET_ULong();
os2->ulUnicodeRange2 = GET_ULong();
os2->ulUnicodeRange3 = GET_ULong();
os2->ulUnicodeRange4 = GET_ULong();
for ( i = 0; i < 4; i++ )
os2->achVendID[i] = 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();
if ( os2->version >= 0x0001 )
{
/* only version 1 tables */
if ( ACCESS_Frame( 8L ) ) /* read into frame */
return error;
os2->ulCodePageRange1 = GET_ULong();
os2->ulCodePageRange2 = GET_ULong();
FORGET_Frame();
}
else
{
os2->ulCodePageRange1 = 0;
os2->ulCodePageRange2 = 0;
}
PTRACE2(( "loaded\n" ));
return TT_Err_Ok;
}
/*******************************************************************
*
* Function : Load_TrueType_PostScript
*
* Description : Loads the post table into face table.
*
* Input : face face table to look for
*
* Output : SUCCESS on success. FAILURE on error.
*
******************************************************************/
LOCAL_FUNC
TT_Error Load_TrueType_PostScript( PFace face )
{
DEFINE_LOCALS;
Long i;
TT_Postscript* post = &face->postscript;
PTRACE2(( "PostScript " ));
if ( ( i = TT_LookUp_Table( face, TTAG_post ) ) < 0 )
return TT_Err_Post_Table_Missing;
if ( FILE_Seek( face->dirTables[i].Offset ) ||
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 a */
/* library extension (ftxpost). */
PTRACE2(( "loaded\n" ));
return TT_Err_Ok;
}
/*******************************************************************
*
* Function : Load_TrueType_Hdmx
*
* Description : Loads the horizontal device metrics table.
*
* Input : face face object to look for
*
* Output : SUCCESS on success. FAILURE on error.
*
******************************************************************/
LOCAL_FUNC
TT_Error Load_TrueType_Hdmx( PFace face )
{
DEFINE_LOCALS;
TT_Hdmx_Record* rec;
TT_Hdmx hdmx;
Long table;
UShort n, num_glyphs;
Long record_size;
hdmx.version = 0;
hdmx.num_records = 0;
hdmx.records = 0;
face->hdmx = hdmx;
if ( ( table = TT_LookUp_Table( face, TTAG_hdmx ) ) < 0 )
return TT_Err_Ok;
if ( FILE_Seek( face->dirTables[table].Offset ) ||
ACCESS_Frame( 8L ) )
return error;
hdmx.version = GET_UShort();
hdmx.num_records = GET_Short();
record_size = GET_Long();
FORGET_Frame();
/* Only recognize format 0 */
if ( hdmx.version != 0 )
return TT_Err_Ok;
if ( ALLOC( hdmx.records, sizeof ( TT_Hdmx_Record ) * hdmx.num_records ) )
return error;
num_glyphs = face->numGlyphs;
record_size -= num_glyphs+2;
rec = hdmx.records;
for ( n = 0; n < hdmx.num_records; n++ )
{
/* read record */
if ( ACCESS_Frame( 2L ) )
goto Fail;
rec->ppem = GET_Byte();
rec->max_width = GET_Byte();
FORGET_Frame();
if ( ALLOC( rec->widths, num_glyphs ) ||
FILE_Read( rec->widths, num_glyphs ) )
goto Fail;
/* skip padding bytes */
if ( record_size > 0 )
if ( FILE_Skip( record_size ) )
goto Fail;
rec++;
}
face->hdmx = hdmx;
return TT_Err_Ok;
Fail:
for ( n = 0; n < hdmx.num_records; n++ )
FREE( hdmx.records[n].widths );
FREE( hdmx.records );
return error;
}
/*******************************************************************
*
* Function : Free_TrueType_Hdmx
*
* Description : Frees the horizontal device metrics table.
*
* Input : face face object to look for
*
* Output : TT_Err_Ok.
*
******************************************************************/
LOCAL_FUNC
TT_Error Free_TrueType_Hdmx( PFace face )
{
UShort n;
if ( !face )
return TT_Err_Ok;
for ( n = 0; n < face->hdmx.num_records; n++ )
FREE( face->hdmx.records[n].widths );
FREE( face->hdmx.records );
face->hdmx.num_records = 0;
return TT_Err_Ok;
}
/*******************************************************************
*
* Function : Load_TrueType_Any
*
* Description : Loads any font table into client memory. Used by
* the TT_Get_Font_Data() API function.
*
* Input : face face object to look for
*
* tag 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 starting offset in the table (or the file
* if tag == 0 )
*
* buffer address of target buffer
*
* length address of decision variable :
*
* if length == NULL :
* load the whole table. returns an
* an error if 'offset' == 0 !!
*
* if *length == 0 :
* exit immediately, returning the
* length of the given table, or of
* the font file, depending on the
* value of 'tag'
*
* if *length != 0 :
* load the next 'length' bytes of
* table or font, starting at offset
* 'offset' (in table or font too).
*
* Output : Error condition
*
******************************************************************/
LOCAL_FUNC
TT_Error Load_TrueType_Any( PFace face,
ULong tag,
Long offset,
void* buffer,
Long* length )
{
TT_Stream stream;
TT_Error error;
Long table;
ULong size;
if ( tag != 0 )
{
/* look for tag in font directory */
table = TT_LookUp_Table( face, tag );
if ( table < 0 )
return TT_Err_Table_Missing;
offset += face->dirTables[table].Offset;
size = face->dirTables[table].Length;
}
else
/* tag = 0 -- the use want to access the font file directly */
size = TT_Stream_Size( face->stream );
if ( length && *length == 0 )
{
*length = size;
return TT_Err_Ok;
}
if ( length )
size = *length;
if ( !USE_Stream( face->stream, stream ) )
(void)FILE_Read_At( offset, buffer, size );
DONE_Stream( stream );
return error;
}
/* END */
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