diff options
Diffstat (limited to 'include/freetype/config/ftoption.h')
| -rw-r--r-- | include/freetype/config/ftoption.h | 35 |
1 files changed, 29 insertions, 6 deletions
diff --git a/include/freetype/config/ftoption.h b/include/freetype/config/ftoption.h index 0258e1b..22056e1 100644 --- a/include/freetype/config/ftoption.h +++ b/include/freetype/config/ftoption.h @@ -488,8 +488,7 @@ FT_BEGIN_HEADER /*************************************************************************/ /* */ /* Define TT_CONFIG_OPTION_BYTECODE_INTERPRETER if you want to compile */ - /* a bytecode interpreter in the TrueType driver. Note that there are */ - /* important patent issues related to the use of the interpreter. */ + /* a bytecode interpreter in the TrueType driver. */ /* */ /* By undefining this, you will only compile the code necessary to load */ /* TrueType glyphs without hinting. */ @@ -504,10 +503,13 @@ FT_BEGIN_HEADER /* */ /* If you define TT_CONFIG_OPTION_UNPATENTED_HINTING, a special version */ /* of the TrueType bytecode interpreter is used that doesn't implement */ - /* any of the patented opcodes and algorithms. Note that the */ - /* TT_CONFIG_OPTION_UNPATENTED_HINTING macro is *ignored* if you define */ - /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER; in other words, either define */ - /* TT_CONFIG_OPTION_BYTECODE_INTERPRETER or */ + /* any of the patented opcodes and algorithms. The patents related to */ + /* TrueType hinting have expired worldwide since May 2010; this option */ + /* is now deprecated. */ + /* */ + /* Note that the TT_CONFIG_OPTION_UNPATENTED_HINTING macro is *ignored* */ + /* if you define TT_CONFIG_OPTION_BYTECODE_INTERPRETER; in other words, */ + /* either define TT_CONFIG_OPTION_BYTECODE_INTERPRETER or */ /* TT_CONFIG_OPTION_UNPATENTED_HINTING but not both at the same time. */ /* */ /* This macro is only useful for a small number of font files (mostly */ @@ -691,6 +693,27 @@ FT_BEGIN_HEADER /* + * 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 + + + /* * This macro is defined if either unpatented or native TrueType * hinting is requested by the definitions above. */ |