diff options
Diffstat (limited to 'freetype/devel/ftoption.h')
| -rw-r--r-- | freetype/devel/ftoption.h | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/freetype/devel/ftoption.h b/freetype/devel/ftoption.h index 058601e4c..32dd25aa7 100644 --- a/freetype/devel/ftoption.h +++ b/freetype/devel/ftoption.h @@ -689,7 +689,28 @@ FT_BEGIN_HEADER * is recommended to disable the macro since it reduces the library's code * size and activates a few memory-saving optimizations as well. */ -/* #define FT_CONFIG_OPTION_OLD_INTERNALS */ +#define FT_CONFIG_OPTION_OLD_INTERNALS + + + /* + * To detect legacy cache-lookup call from a rogue client (<= 2.1.7), + * we restrict the number of charmaps in a font. The current API of + * FTC_CMapCache_Lookup() takes cmap_index & charcode, but old API + * takes charcode only. To determine the passed value is for cmap_index + * or charcode, the possible cmap_index is restricted not to exceed + * the minimum possible charcode by a rogue client. It is also very + * unlikely that a rogue client is interested in Unicode values 0 to 15. + * + * NOTE: The original threshold was 4 deduced from popular number of + * cmap subtables in UCS-4 TrueType fonts, but now it is not + * irregular for OpenType fonts to have more than 4 subtables, + * because variation selector subtables are available for Apple + * and Microsoft platforms. + */ + +#ifdef FT_CONFIG_OPTION_OLD_INTERNALS +#define FT_MAX_CHARMAP_CACHEABLE 15 +#endif /* |