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Hash : 71632c96
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Date : 2012-01-22T15:31:44
Fallback to Latin script if the font has no other usable scripts Patch and description from Jonathan Kew: It turns out that some legacy Thai fonts provide OpenType substitution features to implement mark positioning, but (incorrectly) put those features/lookups under the 'latn' script tag instead of using 'thai' (or possibly 'DFLT'). See https://bugzilla.mozilla.org/show_bug.cgi?id=719366 for an example and more detailed description. Although this is really a font bug, I suggest that we could improve the rendering of such fonts by looking for the 'latn' as a fallback if neither the requested script nor "default" is found in hb_ot_layout_table_choose_script. Suggested patch against harfbuzz master is attached. This does _not_ affect the other kind of legacy Thai font, where custom code to support vendor-specific PUA codepoints would be needed. I'm not keen to go down that path; IMO, such fonts should be ruthlessly stamped out in favour of standards-based solutions. :) JK
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Files
- Makefile.am
- check-c-linkage-decls.sh
- check-header-guards.sh
- check-includes.sh
- check-internal-symbols.sh
- check-libstdc++.sh
- gen-arabic-table.py
- gen-indic-table.py
- hb-blob.cc
- hb-blob.h
- hb-buffer-private.hh
- hb-buffer.cc
- hb-buffer.h
- hb-common.cc
- hb-common.h
- hb-fallback-shape-private.hh
- hb-fallback-shape.cc
- hb-font-private.hh
- hb-font.cc
- hb-font.h
- hb-ft.cc
- hb-ft.h
- hb-glib.cc
- hb-glib.h
- hb-gobject-enums.cc.tmpl
- hb-gobject-structs.cc
- hb-gobject.h
- hb-graphite2.cc
- hb-graphite2.h
- hb-icu.cc
- hb-icu.h
- hb-mutex-private.hh
- hb-object-private.hh
- hb-open-file-private.hh
- hb-open-type-private.hh
- hb-ot-head-table.hh
- hb-ot-hhea-table.hh
- hb-ot-hmtx-table.hh
- hb-ot-layout-common-private.hh
- hb-ot-layout-gdef-table.hh
- hb-ot-layout-gpos-table.hh
- hb-ot-layout-gsub-table.hh
- hb-ot-layout-gsubgpos-private.hh
- hb-ot-layout-private.hh
- hb-ot-layout.cc
- hb-ot-layout.h
- hb-ot-map-private.hh
- hb-ot-map.cc
- hb-ot-maxp-table.hh
- hb-ot-name-table.hh
- hb-ot-shape-complex-arabic-table.hh
- hb-ot-shape-complex-arabic.cc
- hb-ot-shape-complex-indic-machine.rl
- hb-ot-shape-complex-indic-table.hh
- hb-ot-shape-complex-indic.cc
- hb-ot-shape-complex-misc.cc
- hb-ot-shape-complex-private.hh
- hb-ot-shape-normalize.cc
- hb-ot-shape-private.hh
- hb-ot-shape.cc
- hb-ot-shape.h
- hb-ot-tag.cc
- hb-ot-tag.h
- hb-ot.h
- hb-private.hh
- hb-shape.cc
- hb-shape.h
- hb-tt-font.cc
- hb-unicode-private.hh
- hb-unicode.cc
- hb-unicode.h
- hb-uniscribe.cc
- hb-uniscribe.h
- hb-version.h.in
- hb.h
- main.cc
