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[autofit] More coverage fixes for complex scripts. 

* src/autofit/hbshim.c (af_get_coverage): Merge input glyph coverage
of GSUB lookups into output coverage.  Otherwise, ligatures are not
handled properly.
Don't check blue zone characters for default coverage.
This commit is contained in:
Werner Lemberg 2014-04-17 15:53:25 +02:00
parent bbd8313b5d
commit 8c7fb78b16
2 changed files with 33 additions and 16 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
2014-04-17 Werner Lemberg <wl@gnu.org>
[autofit] More coverage fixes for complex scripts.
* src/autofit/hbshim.c (af_get_coverage): Merge input glyph coverage
of GSUB lookups into output coverage. Otherwise, ligatures are not
handled properly.
Don't check blue zone characters for default coverage.
2014-04-17 Werner Lemberg <wl@gnu.org>
Make `FT_Get_SubGlyph_Info' actually work.

40
src/autofit/hbshim.c
View File

@ -102,10 +102,12 @@
{
hb_face_t* face;
hb_set_t* gsub_lookups; /* GSUB lookups for a given script */
hb_set_t* gsub_glyphs; /* glyphs covered by GSUB lookups */
hb_set_t* gpos_lookups; /* GPOS lookups for a given script */
hb_set_t* gpos_glyphs; /* glyphs covered by GPOS lookups */
hb_set_t* gsub_lookups; /* GSUB lookups for a given script */
hb_set_t* gsub_glyphs_in; /* glyphs covered by GSUB lookups */
hb_set_t* gsub_glyphs_out;
hb_set_t* gpos_lookups; /* GPOS lookups for a given script */
hb_set_t* gpos_glyphs; /* glyphs covered by GPOS lookups */
hb_script_t script;
const hb_tag_t* coverage_tags;
@ -125,10 +127,11 @@
face = hb_font_get_face( globals->hb_font );
gsub_lookups = hb_set_create();
gsub_glyphs = hb_set_create();
gpos_lookups = hb_set_create();
gpos_glyphs = hb_set_create();
gsub_lookups = hb_set_create();
gsub_glyphs_in = hb_set_create();
gsub_glyphs_out = hb_set_create();
gpos_lookups = hb_set_create();
gpos_glyphs = hb_set_create();
coverage_tags = coverages[style_class->coverage];
script = scripts[style_class->script];
@ -199,9 +202,9 @@
HB_OT_TAG_GSUB,
idx,
NULL,
gsub_glyphs_in,
NULL,
NULL,
gsub_glyphs );
gsub_glyphs_out );
}
#ifdef FT_DEBUG_LEVEL_TRACE
@ -247,6 +250,7 @@
* (this is, not a single character is covered), we skip this coverage.
*
*/
if ( style_class->coverage != AF_COVERAGE_DEFAULT )
{
AF_Blue_Stringset bss = style_class->blue_stringset;
const AF_Blue_StringRec* bs = &af_blue_stringsets[bss];
@ -288,6 +292,9 @@
}
}
/* merge in and out glyphs */
hb_set_union( gsub_glyphs_out, gsub_glyphs_in );
/*
* Various OpenType features might use the same glyphs at different
* vertical positions; for example, superscript and subscript glyphs
@ -336,14 +343,14 @@
*
*/
if ( style_class->coverage != AF_COVERAGE_DEFAULT )
hb_set_subtract( gsub_glyphs, gpos_glyphs );
hb_set_subtract( gsub_glyphs_out, gpos_glyphs );
#ifdef FT_DEBUG_LEVEL_TRACE
FT_TRACE4(( " glyphs without GPOS data (`*' means already assigned)" ));
count = 0;
#endif
for ( idx = -1; hb_set_next( gsub_glyphs, &idx ); )
for ( idx = -1; hb_set_next( gsub_glyphs_out, &idx ); )
{
#ifdef FT_DEBUG_LEVEL_TRACE
if ( !( count % 10 ) )
@ -375,10 +382,11 @@
#endif
Exit:
hb_set_destroy( gsub_lookups );
hb_set_destroy( gsub_glyphs );
hb_set_destroy( gpos_lookups );
hb_set_destroy( gpos_glyphs );
hb_set_destroy( gsub_lookups );
hb_set_destroy( gsub_glyphs_in );
hb_set_destroy( gsub_glyphs_out );
hb_set_destroy( gpos_lookups );
hb_set_destroy( gpos_glyphs );
return FT_Err_Ok;
}