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* src/base/ftobjs.c (find_unicode_charmap): added some comments to 

better explain what's happening there

        * src/base/ftobjs.c (open_face): included Graham Asher's fix to
        prevent faces without Unicode charmaps from loading
This commit is contained in:
David Turner 2002-12-18 22:43:07 +00:00
parent 40587b66f7
commit 9169587378
2 changed files with 41 additions and 6 deletions
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8
ChangeLog
View File

@ -1,3 +1,11 @@
2002-12-17 David Turner <david@freetype.org>
* src/base/ftobjs.c (find_unicode_charmap): added some comments to
better explain what's happening there
* src/base/ftobjs.c (open_face): included Graham Asher's fix to
prevent faces without Unicode charmaps from loading
2002-12-16 David Turner <david@freetype.org>
* docs/VERSION.DLL: updating document to better explain the differences between

39
src/base/ftobjs.c
View File

@ -731,6 +731,29 @@
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 id's 3,10, is normally the */
/* last one, we loop backwards. This looses with type1 fonts with */
/* non-BMP characters (<.0001%), this wins with .ttf with non-BMP */
@ -746,10 +769,11 @@
/* 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 ) )
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];
@ -833,10 +857,13 @@
/* select Unicode charmap by default */
error2 = find_unicode_charmap( face );
/* if no Unicode charmap can be found, return FT_Err_Invalid_Argument */
/* 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_Argument )
if ( error2 && error2 != FT_Err_Invalid_CharMap_Handle )
{
error = error2;
goto Fail;