From the issue:
"In this font, the virama,ya first forms a ligature, then decomposes back to
virama,ya. This causes those two to be marked parts of a MultipleSubst
sequence. When attaching the matra, we look for the first of the MultipleSubst
sequence because that's where we attach to (because of eg #740). In this case,
the first glyph in the MultipleSubst sequence is a mark, so we skip it and
attach to the base char before it."
Font in question is Nirmala UI from Windows 10. Test sequence:
U+0926,U+094D,U+092F,U+0941
Fixes https://github.com/harfbuzz/harfbuzz/issues/1020
* Handle EINTR on fallback reader
* Increase fallback reader limitation size limitation to 2 << 28
* Ensure _O_BINARY does exist if MMAP is used on Windows
(maybe superfluous but makes me more confident)
In particular, if CoverageFormat2 has unsorted ranges, bail out.
Otherwise, 64k ranges of each 64k glyphs can DoS closure() method.
We can do the same for CoverageFormat1, but that one does not expose
the quadratic behavior, so, fine.
With this hb-view/hb-shape support pipes and possibly socket and named pipe
also, anything fails just on mmap.
We can later do the same for Windows also.
This however reveals two issues, the fact most of our bots don't have HAVE_MMAP and using
this instead the other fread/fopen reader can make failure on CI. I should look at them separately
this change however is very low risk I believe.
This checks if the blob isn't empty and uses `hb_face_count`
to see if the font file passes the simple font file sanitization
so can detect if the input is actually a font and checks also
whether input font-index is out of range.
We were passing the font path directly to freetype so rendering
was broken when we are getting the font from stdin.
This fixes it by using FT_New_Memory_Face instead.
This fixes:
* build/util/hb-view /dev/stdin text < font.ttf
* build/util/hb-view - text < font.ttf
* cat font.ttf | build/util/hb-view - text
but doesn't work on
* cat font.ttf | build/util/hb-view /dev/stdin text
which I will try to fix separately.
Just include hb-static.cc in libharfbuzz-subset.so source list as
well. Those building it built-in will include hb-static.cc once
already. No need for any gymnastics.
Ebrahim Byagowi
Behdad Esfahbod
punchcutter
Garret Rieger
Jonathan Kew
prrace
David Corbett