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- same CFF loader fix (stricter checking though than Werner's version)

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- document light auto-hinter improvements
This commit is contained in:
David Turner 2007-01-25 12:23:37 +00:00
parent b1be9e8b57
commit a42567bf66
4 changed files with 28 additions and 5 deletions
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12
ChangeLog
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@ -1,3 +1,15 @@
2007-01-25 David Turner <david@freetype.org>
* src/cff/cffload.c (cff_index_get_pointers): fixed a bug in the
sanity check which caused the last entry in each index to become
empty. since this function is only used to load local and global
functions, this meant that any charstring that called the last
local/global function would fail.
* src/cff/cffgload.c: fixed sanity check for empty functions
* docs/CHANGES: document light auto-hinting improvement
2007-01-25 Werner Lemberg <wl@gnu.org>
* src/cff/cffload.c (cff_index_get_pointers): Handle last entry

9
docs/CHANGES
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@ -8,6 +8,15 @@ CHANGES BETWEEN 2.3.0 and 2.3.1
- A typo in a security check introduced after version 2.2.1
prevented FreeType to render some glyphs in CFF fonts.
II. IMPORTANT CHANGES
- the light auto-hinting mode has been improved and should generate
less blurry text in many cases, without changing spacing. This is
done by slightly translating/dilating the outline in the horizontal
direction in order to better align its features to the pixel grid.
since the transform is entirely linear, this still provides very
good approximations to the original glyph shapes.
======================================================================

4
src/cff/cffgload.c
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@ -2089,7 +2089,7 @@
zone->limit = decoder->locals[idx + 1];
zone->cursor = zone->base;
if ( !zone->base )
if ( !zone->base || zone->limit == zone->base )
{
FT_ERROR(( "cff_decoder_parse_charstrings:"
" invoking empty subrs!\n" ));
@ -2131,7 +2131,7 @@
zone->limit = decoder->globals[idx + 1];
zone->cursor = zone->base;
if ( !zone->base )
if ( !zone->base || zone->limit == zone->base )
{
FT_ERROR(( "cff_decoder_parse_charstrings:"
" invoking empty subrs!\n" ));

8
src/cff/cffload.c
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@ -403,11 +403,13 @@
if ( !offset )
offset = old_offset;
/* sanity check for invalid offset tables */
else if ( offset < old_offset ||
offset - 1 > idx->data_size )
/* two sanity checks for invalid offset tables */
else if ( offset < old_offset )
offset = old_offset;
else if ( offset-1 >= idx->data_size && n < idx->count )
offset = old_offset;
t[n] = idx->bytes + offset - 1;
old_offset = offset;