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[sfnt] Fix handling of embedded bitmap strikes. 

This corrects the commit from 2013-11-21.  Problem reported by
Andrey Panov <panov@canopus.iacp.dvo.ru>.

* src/sfnt/ttsbit.c (tt_sbit_decoder_load_bitmap): Fix logic to
detect excessive bytes for bit-aligned bitmaps.
This commit is contained in:
Werner Lemberg 2013-12-04 06:18:56 +01:00
parent c2b4753970
commit 64b395cca6
2 changed files with 22 additions and 2 deletions
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12
ChangeLog
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@ -1,3 +1,13 @@
2013-12-04 Werner Lemberg <wl@gnu.org>
[sfnt] Fix handling of embedded bitmap strikes.
This corrects the commit from 2013-11-21. Problem reported by
Andrey Panov <panov@canopus.iacp.dvo.ru>.
* src/sfnt/ttsbit.c (tt_sbit_decoder_load_bitmap): Fix logic to
detect excessive bytes for bit-aligned bitmaps.
2013-12-03 Werner Lemberg <wl@gnu.org>
[truetype] Remove dead code.
@ -101,7 +111,7 @@
2013-11-21 Werner Lemberg <wl@gnu.org>
[truetype] Improve handling of buggy embedded bitmap strikes.
[sfnt] 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>.

12
src/sfnt/ttsbit.c
View File

@ -976,11 +976,21 @@
/* 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. */
/* */
/* Note that for some (width,height) combinations, where the */
/* width is not a multiple of 8, the sizes for bit- and */
/* byte-aligned data are equal, for example (7,7) or (15,6). We */
/* then prefer what `glyph_format' specifies. */
FT_UInt width = decoder->metrics->width;
FT_UInt height = decoder->metrics->height;
FT_UInt bit_size = ( width * height + 7 ) >> 3;
FT_UInt byte_size = height * ( ( width + 7 ) >> 3 );
if ( height * ( ( width + 7 ) >> 3 ) == (FT_UInt)( p_limit - p ) )
if ( bit_size < byte_size &&
byte_size == (FT_UInt)( p_limit - p ) )
loader = tt_sbit_decoder_load_byte_aligned;
else
loader = tt_sbit_decoder_load_bit_aligned;