This isn't the optimal solution yet, but it restores the previous
rendering quality (more or less).
* src/smooth/ftgrays.c (gray_render_conic): Do more splitting.
Patch suggested by Miles.Lau <sunliang_liu@foxitsoftware.com>.
* src/cff/cffgload.c (cff_decoder_parse_charstrings): Emit tracing
message for unknown operators and continue instead of exiting with a
syntax error.
* src/truetype/interp.c: Set even more TT_Err_Invalid_Reference
error codes only if pedantic hinting is active. At the same time,
try to provide sane values which hopefully allow useful
continuation. Exception to this is CALL and LOOPCALL – due to
possible stack corruption it is necessary to bail out.
* src/truetype/ttinterp.c (TT_RunIns, Ins_FLIPPT, Ins_DELTAP,
Ins_DELTAC): Exit with error only if `pedantic_hinting' is set.
Otherwise, try to do something sane.
Thanks to Greg Hitchcock who explained the issue.
* src/truetype/ttinterp.c (Ins_MIRP): Replace a `>=' operator with
`>' since the description in the specification is incorrect.
This fixes, for example, glyph `two' in font `Helvetica Neue LT Com
65 medium' at 15ppem.
Right before B/W rasterizing, the bbox gets simply rounded to
integers. This fixes, for example, glyph `three' in font `Helvetica
Neue LT Com 65 Medium' at 11ppem.
Thanks to Greg Hitchcock who explained this behaviour.
* src/raster/ftrend1.c (ft_raster1_render): Implement it.
This catches a rendering problem with glyph `x' from Tahoma at
10ppem. It seems that the increase of the precision in the change
from 2009-06-11 makes a larger jitter value unnecessary.
* src/raster/ftraster.c (Set_High_Precision): Implement it.
If a drop-out rule would switch on a pixel outside of the glyph's
bounding box, use the right (or top) pixel instead. This is an
undocumented feature, but some fonts like `Helvetica Neue LT Com 65
Medium' heavily rely on it.
Thanks to Greg Hitchcock who explained this behaviour.
* src/raster/ftraster.c (Vertical_Sweep_Drop,
Horizontal_Sweep_Drop): Implement it.
When a node comparator changes the cached nodes during the
search of a node matching with queried properties, the
pointers obtained before the functon should be updated to
prevent the dereference to freed or reallocated nodes.
To minimize the rescan of the linked list, the update is
executed when the comparator notifies the change of cached
nodes. This change depends previous change:
38b272ffbb
* src/cache/ftccache.h (FTC_CACHE_LOOKUP_CMP): Rescan the
top node if the cached nodes are changed.
* src/cache/ftccache.c (FTC_Cache_Lookup): Ditto.
Some node comparators (comparing the cache node content and
the properties specified by the query) can flush the cache
node to prevent the cache inflation. The change may
invalidate the pointers to the node obtained before the node
comparison, so the change should be noticed to the caller.
The problem caused by the cache node changing is reported by
Harsha, see Savannah bug #31923.
* src/cache/ftccache.h (FTC_Node_CompareFunc): Add new
argument `FT_Bool* list_changed' to indicate the change of
the cached nodes to the caller.
(FTC_CACHE_LOOKUP_CMP): Watch the change of the cached nodes
by `_list_changed'.
(FTC_CACHE_TRYLOOP_END): Take new macro argument `_list_changed'
and update it when FTC_Manager_FlushN() flushes any nodes.
* src/cache/ftccback.h (ftc_snode_compare): Updated to fit
with new FTC_Node_CompareFunc type. (ftc_gnode_compare): Ditto.
* src/cache/ftcbasic.c: Include FT_INTERNAL_OBJECTS_H to
use TRUE/FALSE macros. (ftc_basic_gnode_compare_faceid):
New argument `FT_Bool* list_changed' to indicate the change
of the cache nodes, anyway, it is always FALSE.
* src/cache/ftccmap.c: Include FT_INTERNAL_OBJECTS_H to
use TRUE/FALSE macros. (ftc_cmap_node_compare):
New argument `FT_Bool* list_changed' to indicate the change
of the cache nodes, anyway, it is always FALSE.
(ftc_cmap_node_remove_faceid): Ditto.
* src/cache/ftccache.c (FTC_Cache_NewNode): Pass a NULL
pointer to FTC_CACHE_TRYLOOP_END(), because the result is
not needed. (FTC_Cache_Lookup): Watch the change of the cache
nodes by `list_changed'. (FTC_Cache_RemoveFaceID): Ditto.
* src/cache/ftcglyph.c: Include FT_INTERNAL_OBJECTS_H to
use TRUE/FALSE macros. (ftc_gnode_compare): New argument
`FT_Bool* list_changed' to indicate the change of the cache
nodes, anyway, it is always FALSE. (FTC_GNode_Compare):
New argument `FT_Bool* list_changed' to be passed to
ftc_gnode_compare().
* src/cache/ftcglyph.h (FTC_GNode_Compare): Ditto.
* src/cache/ftcsbits.c (ftc_snode_compare): New argument
`FT_Bool* list_changed' to indicate the change of the cache
nodes, anyway. It is updated by FTC_CACHE_TRYLOOP().
(FTC_SNode_Compare): New argument `FT_Bool* list_changed'
to be passed to ftc_snode_compare().
* src/cache/ftcsbits.h (FTC_SNode_Compare): Ditto.
* src/cache/ftcglyph.h (FTC_GNode_Compare): Add the 3rd
argument `FTC_Cache cache' to fit FTC_Node_CompareFunc
prototype.
* src/cache/ftcglyph.c (FTC_GNode_Compare): Ditto. Anyway,
`cache' is not used by its child ftc_gnode_compare().
There are several duplicated codes getting the top node
from a cache by a given hash, like:
idx = hash & cache->mask;
if ( idx < cache->p )
idx = hash & ( cache->mask * 2 + 1 );
pnode = cache->buckets + idx;
To deduplicate them, a cpp-macro to do same work
FTC_NODE__TOP_FOR_HASH( cache, hash ) is introduced.
For non-inlined config, non-ftc_get_top_node_for_hash() is
also introduced.
* src/cache/ftccache.h (FTC_NODE__TOP_FOR_HASH): Declare
and implement inlined version.
(FTC_CACHE_LOOKUP_CMP): Use FTC_NODE__TOP_FOR_HASH().
* src/cache/ftccache.c (ftc_get_top_node_for_hash): Non-
inlined version.
(ftc_node_hash_unlink): Use FTC_NODE__TOP_FOR_HASH().
(ftc_node_hash_link): Ditto.
(FTC_Cache_Lookup): Ditto.
* src/cache/ftcglyph.c (FTC_GNode_Compare): Conditionalized
for inlined config. This function is a thin wrapper of
ftc_gnode_compare() for inlined FTC_CACHE_LOOKUP_CMP()
(see `nodecmp' argument). Under non-inlined config,
ftc_gnode_compare() is invoked by FTC_Cache_Lookup(),
via FTC_Cache->clazz.node_compare().
* src/cache/ftcglyph.h (FTC_GNode_Compare): Ditto.
* src/cache/ftcsbits.c (FTC_SNode_Compare): Ditto,
for ftc_snode_compare().
* src/cache/ftcsbits.h (FTC_SNode_Compare): Ditto.
* src/cache/ftcglyph.h (FTC_GCACHE_LOOKUP_CMP):
FTC_GCache_Lookup() takes the node via a pointer `FTC_Node*',
differently from cpp-macro FTC_CACHE_LOOKUP_CMP().
If we encouter a space in a string then the sbit buffer is NULL,
height and width are 0s. So the check in ftc_snode_compare will
always pass for spaces (comparision with 255). Here the comments
above the condition are proper but the implementation is not. When
we create an snode I think it is the proper way to initialize the
width to 255 and then put a check for being equal to 255 in snode
compare function.
* src/cache/ftcsbits.c (FTC_SNode_New): Initialize sbit widths with
value 255.
(ftc_snode_compare): Fix condition.
We simply ignore such instructions. This is invalid, but it doesn't
harm; and indeed, there exist such subsetted fonts in PDFs.
Reported by Albert Astals Cid <aacid@kde.org>.
* src/cff/cffgload.c (cff_decoder_parse_charstrings)
[cff_op_hlineto]: Ignore instruction if there aren't any arguments
on the stack.
start_point, check_points, add_point, add_point1, close_contour
macros.
Remove add_contour macro.
Return error code from t1_builder_start_point and
t1_builder_check_points when there was one (instead of returning 0).
Some Latin TrueType fonts are still expected to be unhinted.
Fix Savannah bug #31645.
* src/truetype/ttobjs.c (tt_check_trickyness): Divided to...
(tt_check_trickyness_family): this checking family name, and
(tt_check_trickyness_sfnt_ids): this checking cvt/fpgm/prep.
(tt_get_sfnt_checksum): Function to retrieve the sfnt checksum
for specified subtable even if cleared by lazy PDF generators.
(tt_synth_sfnt_checksum): Function to calculate the checksum.
Werner Lemberg
suzuki toshiya
Kevin Kofler
John Tytgat
LIU Sun-Liang
Joel Klinghed
Harsha
Алексей Подтележников
Johnson Y. Yan