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[truetype] Improve handling of buggy embedded bitmap strikes. 

We are now able to successfully load `AppleMyoungJo.ttf'.
Problem reported by Hin-Tak Leung <htl10@users.sourceforge.net>.

* src/sfnt/ttsbit.c (tt_sbit_decoder_load_bitmap): Don't trust glyph
format.
This commit is contained in:
Werner Lemberg 2013-11-21 13:10:56 +01:00
parent 2862686996
commit 427b176893
2 changed files with 26 additions and 1 deletions
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10
ChangeLog
View File

@ -1,3 +1,13 @@
2013-11-21 Werner Lemberg <wl@gnu.org>
[truetype] Improve handling of buggy embedded bitmap strikes.
We are now able to successfully load `AppleMyoungJo.ttf'.
Problem reported by Hin-Tak Leung <htl10@users.sourceforge.net>.
* src/sfnt/ttsbit.c (tt_sbit_decoder_load_bitmap): Don't trust glyph
format.
2013-11-20 Werner Lemberg <wl@gnu.org>
[truetype] Don't trust `maxp's `maxSizeOfInstructions'.

17
src/sfnt/ttsbit.c
View File

@ -969,7 +969,22 @@
case 2:
case 5:
case 7:
loader = tt_sbit_decoder_load_bit_aligned;
{
/* Don't trust `glyph_format'. For example, Apple's main Korean */
/* system font, `AppleMyungJo.ttf' (version 7.0d2e6), uses glyph */
/* format 7, but the data is format 6. We check whether we have */
/* an excessive number of bytes in the image: If it is equal to */
/* the value for a byte-aligned glyph, use the other loading */
/* routine. */
FT_UInt width = decoder->metrics->width;
FT_UInt height= decoder->metrics->width;
if ( height * ( ( width + 7 ) >> 3 ) == (FT_UInt)( p_limit - p ) )
loader = tt_sbit_decoder_load_byte_aligned;
else
loader = tt_sbit_decoder_load_bit_aligned;
}
break;
case 8: