📄 ftobjs.c
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static FT_Error
find_unicode_charmap( FT_Face face )
{
FT_CharMap* first;
FT_CharMap* cur;
FT_CharMap* unicmap = NULL; /* some UCS-2 map, if we found it */
/* caller should have already checked that `face' is valid */
FT_ASSERT( face );
first = face->charmaps;
if ( !first )
return FT_Err_Invalid_CharMap_Handle;
/*
* The original TrueType specification(s) only specified charmap
* formats that are capable of mapping 8 or 16 bit character codes to
* glyph indices.
*
* However, recent updates to the Apple and OpenType specifications
* introduced new formats that are capable of mapping 32-bit character
* codes as well. And these are already used on some fonts, mainly to
* map non-BMP Asian ideographs as defined in Unicode.
*
* For compatibility purposes, these fonts generally come with
* *several* Unicode charmaps:
*
* - One of them in the "old" 16-bit format, that cannot access
* all glyphs in the font.
*
* - Another one in the "new" 32-bit format, that can access all
* the glyphs.
*
* This function has been written to always favor a 32-bit charmap
* when found. Otherwise, a 16-bit one is returned when found.
*/
/* Since the `interesting' table, with IDs (3,10), is normally the */
/* last one, we loop backwards. This loses with type1 fonts with */
/* non-BMP characters (<.0001%), this wins with .ttf with non-BMP */
/* chars (.01% ?), and this is the same about 99.99% of the time! */
cur = first + face->num_charmaps; /* points after the last one */
for ( ; --cur >= first; )
{
if ( cur[0]->encoding == FT_ENCODING_UNICODE )
{
unicmap = cur; /* record we found a Unicode charmap */
/* XXX If some new encodings to represent UCS-4 are added, */
/* they should be added here. */
if ( ( cur[0]->platform_id == TT_PLATFORM_MICROSOFT &&
cur[0]->encoding_id == TT_MS_ID_UCS_4 ) ||
( cur[0]->platform_id == TT_PLATFORM_APPLE_UNICODE &&
cur[0]->encoding_id == TT_APPLE_ID_UNICODE_32 ) )
/* Hurray! We found a UCS-4 charmap. We can stop the scan! */
{
face->charmap = cur[0];
return 0;
}
}
}
/* We do not have any UCS-4 charmap. Sigh. */
/* Let's see if we have some other kind of Unicode charmap, though. */
if ( unicmap != NULL )
{
face->charmap = unicmap[0];
return 0;
}
/* Chou blanc! */
return FT_Err_Invalid_CharMap_Handle;
}
/*************************************************************************/
/* */
/* <Function> */
/* open_face */
/* */
/* <Description> */
/* This function does some work for FT_Open_Face(). */
/* */
static FT_Error
open_face( FT_Driver driver,
FT_Stream stream,
FT_Long face_index,
FT_Int num_params,
FT_Parameter* params,
FT_Face *aface )
{
FT_Memory memory;
FT_Driver_Class clazz;
FT_Face face = 0;
FT_Error error, error2;
FT_Face_Internal internal = NULL;
clazz = driver->clazz;
memory = driver->root.memory;
/* allocate the face object and perform basic initialization */
if ( FT_ALLOC( face, clazz->face_object_size ) )
goto Fail;
if ( FT_NEW( internal ) )
goto Fail;
face->internal = internal;
face->driver = driver;
face->memory = memory;
face->stream = stream;
#ifdef FT_CONFIG_OPTION_INCREMENTAL
{
int i;
face->internal->incremental_interface = 0;
for ( i = 0; i < num_params && !face->internal->incremental_interface;
i++ )
if ( params[i].tag == FT_PARAM_TAG_INCREMENTAL )
face->internal->incremental_interface = params[i].data;
}
#endif
error = clazz->init_face( stream,
face,
(FT_Int)face_index,
num_params,
params );
if ( error )
goto Fail;
/* select Unicode charmap by default */
error2 = find_unicode_charmap( face );
/* if no Unicode charmap can be found, FT_Err_Invalid_CharMap_Handle */
/* is returned. */
/* no error should happen, but we want to play safe */
if ( error2 && error2 != FT_Err_Invalid_CharMap_Handle )
{
error = error2;
goto Fail;
}
*aface = face;
Fail:
if ( error )
{
destroy_charmaps( face, memory );
clazz->done_face( face );
FT_FREE( internal );
FT_FREE( face );
*aface = 0;
}
return error;
}
/* there's a Mac-specific extended implementation of FT_New_Face() */
/* in src/base/ftmac.c */
#ifndef FT_MACINTOSH
/* documentation is in freetype.h */
FT_EXPORT_DEF( FT_Error )
FT_New_Face( FT_Library library,
const char* pathname,
FT_Long face_index,
FT_Face *aface )
{
FT_Open_Args args;
/* test for valid `library' and `aface' delayed to FT_Open_Face() */
if ( !pathname )
return FT_Err_Invalid_Argument;
args.flags = FT_OPEN_PATHNAME;
args.pathname = (char*)pathname;
return FT_Open_Face( library, &args, face_index, aface );
}
#endif /* !FT_MACINTOSH */
/* documentation is in freetype.h */
FT_EXPORT_DEF( FT_Error )
FT_New_Memory_Face( FT_Library library,
const FT_Byte* file_base,
FT_Long file_size,
FT_Long face_index,
FT_Face *aface )
{
FT_Open_Args args;
/* test for valid `library' and `face' delayed to FT_Open_Face() */
if ( !file_base )
return FT_Err_Invalid_Argument;
args.flags = FT_OPEN_MEMORY;
args.memory_base = file_base;
args.memory_size = file_size;
return FT_Open_Face( library, &args, face_index, aface );
}
#if !defined( FT_MACINTOSH ) && defined( FT_CONFIG_OPTION_MAC_FONTS )
/* The behavior here is very similar to that in base/ftmac.c, but it */
/* is designed to work on non-mac systems, so no mac specific calls. */
/* */
/* We look at the file and determine if it is a mac dfont file or a mac */
/* resource file, or a macbinary file containing a mac resource file. */
/* */
/* Unlike ftmac I'm not going to look at a `FOND'. I don't really see */
/* the point, especially since there may be multiple `FOND' resources. */
/* Instead I'll just look for `sfnt' and `POST' resources, ordered as */
/* they occur in the file. */
/* */
/* Note that multiple `POST' resources do not mean multiple postscript */
/* fonts; they all get jammed together to make what is essentially a */
/* pfb file. */
/* */
/* We aren't interested in `NFNT' or `FONT' bitmap resources. */
/* */
/* As soon as we get an `sfnt' load it into memory and pass it off to */
/* FT_Open_Face. */
/* */
/* If we have a (set of) `POST' resources, massage them into a (memory) */
/* pfb file and pass that to FT_Open_Face. (As with ftmac.c I'm not */
/* going to try to save the kerning info. After all that lives in the */
/* `FOND' which isn't in the file containing the `POST' resources so */
/* we don't really have access to it. */
/* Finalizer for a memory stream; gets called by FT_Done_Face().
It frees the memory it uses. */
/* from ftmac.c */
static void
memory_stream_close( FT_Stream stream )
{
FT_Memory memory = stream->memory;
FT_FREE( stream->base );
stream->size = 0;
stream->base = 0;
stream->close = 0;
}
/* Create a new memory stream from a buffer and a size. */
/* from ftmac.c */
static FT_Error
new_memory_stream( FT_Library library,
FT_Byte* base,
FT_ULong size,
FT_Stream_CloseFunc close,
FT_Stream *astream )
{
FT_Error error;
FT_Memory memory;
FT_Stream stream;
if ( !library )
return FT_Err_Invalid_Library_Handle;
if ( !base )
return FT_Err_Invalid_Argument;
*astream = 0;
memory = library->memory;
if ( FT_NEW( stream ) )
goto Exit;
FT_Stream_OpenMemory( stream, base, size );
stream->close = close;
*astream = stream;
Exit:
return error;
}
/* Create a new FT_Face given a buffer and a driver name. */
/* from ftmac.c */
static FT_Error
open_face_from_buffer( FT_Library library,
FT_Byte* base,
FT_ULong size,
FT_Long face_index,
const char* driver_name,
FT_Face *aface )
{
FT_Open_Args args;
FT_Error error;
FT_Stream stream;
FT_Memory memory = library->memory;
error = new_memory_stream( library,
base,
size,
memory_stream_close,
&stream );
if ( error )
{
FT_FREE( base );
return error;
}
args.flags = FT_OPEN_STREAM;
args.stream = stream;
if ( driver_name )
{
args.flags = args.flags | FT_OPEN_DRIVER;
args.driver = FT_Get_Module( library, driver_name );
}
error = FT_Open_Face( library, &args, face_index, aface );
if ( error == FT_Err_Ok )
(*aface)->face_flags &= ~FT_FACE_FLAG_EXTERNAL_STREAM;
else
{
FT_Stream_Close( stream );
FT_FREE( stream );
}
return error;
}
/* The resource header says we've got resource_cnt `POST' (type1) */
/* resources in this file. They all need to be coalesced into */
/* one lump which gets passed on to the type1 driver. */
/* Here can be only one PostScript font in a file so face_index */
/* must be 0 (or -1). */
/* */
static FT_Error
Mac_Read_POST_Resource( FT_Library library,
FT_Stream stream,
FT_Long *offsets,
FT_Long resource_cnt,
FT_Long face_index,
FT_Face *aface )
{
FT_Error error = FT_Err_Cannot_Open_Resource;
FT_Memory memory = library->memory;
FT_Byte* pfb_data;
int i, type, flags;
FT_Long len;
FT_Long pfb_len, pfb_pos, pfb_lenpos;
FT_Long rlen, temp;
if ( face_index == -1 )
face_index = 0;
if ( face_index != 0 )
return error;
/* Find the length of all the POST resources, concatenated. Assume */
/* worst case (each resource in its own section). */
pfb_len = 0;
for ( i = 0; i < resource_cnt; ++i )
{
error = FT_Stream_Seek( stream, offsets[i] );
if ( error )
goto Exit;
if ( FT_READ_LONG( temp ) )
goto Exit;
pfb_len += temp + 6;
}
if ( FT_ALLOC( pfb_data, (FT_Long)pfb_len + 2 ) )
goto Exit;
pfb_data[0] = 0x80;
pfb_data[1] = 1; /* Ascii section */
pfb_data[2] = 0; /* 4-byte length, fill in later */
pfb_data[3] = 0;
pfb_data[4] = 0;
pfb_data[5] = 0;
pfb_pos = 6;
pfb_lenpos = 2;
len = 0;
type = 1;
for ( i = 0; i < resource_cnt; ++i )
{
error = FT_Stream_Seek( stream, offsets[i] );
if ( error )
goto Exit2;
if ( FT_READ_LONG( rlen ) )
goto Exit;
if ( FT_READ_USHORT( flags ) )
goto Exit;
rlen -= 2; /* the flags are part of the resource */
if ( ( flags >> 8 ) == type )
len += rlen;
else
{
pfb_data[pfb_lenpos ] = (FT_Byte)( len );
pfb_data[pfb_lenpos + 1] = (FT_Byte)( len >> 8 );
pfb_data[pfb_lenpos + 2] = (FT_Byte)( len >> 16 );
pfb_data[pfb_lenpos + 3] = (FT_Byte)( len >> 24 );
if ( ( flags >> 8 ) == 5 ) /* End of font mark */
break;
pfb_data[pfb_pos++] = 0x80;
type = flags >> 8;
len = rlen;
pfb_data[pfb_pos++] = (FT_Byte)type;
pfb_lenpos = pfb_pos;
pfb_data[pfb_pos++] = 0; /* 4-byte length, fill in later */
pfb_data[pfb_pos++] = 0;
pfb_data[pfb_pos++] = 0;
pfb_data[pfb_pos++] = 0;
}
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