Commit Graph

4251 Commits

Author SHA1 Message Date
Behdad Esfahbod fe5f9b1ae3 [aat] Fix ContextualSubtable sanitization
Fixes MORX-18, MORX-19, and MORX-22.
2018-02-04 12:36:54 -05:00
Bruce Mitchener e8859fca3e Enable use of atexit() on macOS and related platforms.
The atexit() man page indicates that this is expected to behave
in the expected way on unloading of shared libraries.
2018-02-03 19:20:40 -08:00
Bruce Mitchener a89573770b Use nullptr, not NULL. 2018-02-03 21:26:58 +02:00
David Corbett ccb0367dae Let VS1 follow U+1031 MYANMAR VOWEL SIGN E 2018-02-02 12:41:07 -08:00
punchcutter c6dbf6e77c Allow optional ZWJ in virama terminated cluster 2018-01-31 14:16:25 -08:00
Bruce Mitchener dae20fb5a7 Use nullptr instead of 0. 2018-01-31 08:18:48 -08:00
Bruce Mitchener 90218fa93c Fix typos. 2018-01-31 08:18:15 -08:00
Bruce Mitchener 148ca61075 [ot-layout] Fix nullptr dereference.
If the `calloc` for `gsub_accels` or `gpos_accels` fails, then the
unlikely branch afterwards can be taken, which frees up the
`hb_ot_layout_t`, but since those fields can now be `nullptr`, then
we don't want to dereference them.
2018-01-31 08:05:25 -08:00
Bruce Mitchener 0c66043a92 [coretext] Fix memory leaks.
In `reference_table`, if the data is empty and we return early,
we still need to release the data object.

In `hb_coretext_shape`, there two edge cases where an early
return should release the attributed string.
2018-01-31 08:04:15 -08:00
Behdad Esfahbod e89df6e1ae [aat] Limit number of DontAdvance transitions
Remove the faulty loop-detection logic. Use max-ops for breaking
out of infinite loops or heavy work.

https://twitter.com/behdadesfahbod/status/958065026262183936
2018-01-30 11:01:18 -08:00
Ebrahim Byagowi 55cae0d72e
[test] Use 'otool -L' where ldd doesn't exist (macOS) (#732) 2018-01-29 18:05:24 +03:30
David Corbett 2ec7dd1f6c Fix Travis build on macOS (#731) 2018-01-29 02:18:28 +03:30
Behdad Esfahbod 12757b6929 Misc warning fixes
Fixes https://github.com/harfbuzz/harfbuzz/issues/712
2018-01-26 18:14:05 -08:00
bungeman 85be365ed9 Use KernSubTableFormat2::rightClassTable
Issue originally reported at http://cppfiles.com/chromium.txt .

This fixes what appears to be a copy - paste issue which causes both
KernSubTableFormat2::rightClassTable and the 'right' argument to
KernSubTableFormat2::get_kerning to go unused.
2018-01-26 15:20:18 -08:00
Bruce Mitchener 19a93fcf19 Fix typos. 2018-01-21 10:33:54 -08:00
Behdad Esfahbod 51ce3828e6 [aat] Fix Ligature matching
I hope... Makes "ffi" work with Zapfino. I'm not sure if doing it correctly though...
2018-01-19 18:37:58 -08:00
Behdad Esfahbod bef509855c [aat] Add TODO 2018-01-19 18:24:00 -08:00
Behdad Esfahbod e6f283ed7d [aat] Implement LigatureSubtable
We form the Zapfino ligature now. Yay! No further testing done.
2018-01-19 18:09:48 -08:00
Behdad Esfahbod f07ce661a2 [aat] Embed a sanitizer context in hb_aat_apply_context_t
For run-time checking.
2018-01-19 16:52:01 -08:00
Behdad Esfahbod 046690a4df [aat] Add hb_aat_apply_context_t 2018-01-19 16:40:13 -08:00
Behdad Esfahbod fd03449094 Rename hb_apply_context_t to hb_ot_apply_context_t 2018-01-19 16:40:13 -08:00
Behdad Esfahbod 94b49beee9 Whitespace 2018-01-19 16:40:13 -08:00
Cosimo Lupo c8f2a4f5b9 hb-common.cc: Hatran script is right-to-left (#714)
"Hatran is written from right to left horizontally"

http://www.unicode.org/L2/L2012/12312-n4324-hatran.pdf

This ancient script was added with Unicode 8.0.

Also this spreadsheet (referenced in an inline comment in the
source code) has it as RTL: http://goo.gl/x9ilM
2018-01-19 01:19:40 +03:30
Ebrahim Byagowi 00806149b9
Improve avoiding C++ linkage, definition creation and cmake tests (#710) 2018-01-19 01:12:31 +03:30
Behdad Esfahbod 461a605fde [aat] Allocate set dynamically 2018-01-17 10:02:48 -08:00
Behdad Esfahbod 949f6af289 Disallow sanitize recursing into Extension subtables multiple times
Fixes https://oss-fuzz.com/v2/testcase-detail/5216838347653120
which is a stack overflow, not by way of infinite recursion, just
being deep.  That's disallowed anyway, so catch it as it happens,
not afterwards.
2018-01-15 20:44:10 -05:00
Behdad Esfahbod bcb6f1ae0a Whitespace 2018-01-15 20:34:05 -05:00
Behdad Esfahbod 12fffce10e [aat] Sanitize classTable in StateTable 2018-01-15 15:41:51 -05:00
Behdad Esfahbod e6263c7142 [aat] Wire up table length to apply() 2018-01-15 15:37:55 -05:00
Behdad Esfahbod 679ae744d0 [aat] Towards implementing LigatureSubtable 2018-01-14 15:03:31 -05:00
Behdad Esfahbod c9e12a2b9b Fix set initializer 2018-01-13 17:05:12 +00:00
Behdad Esfahbod 9009b341c4 [aat] Fix some struct sizes
I hate it that with my compiler at least, it doesn't catch totally uncompilable
statements in templates if they are not used...
2018-01-12 12:04:53 +01:00
Behdad Esfahbod 57051b4f67 [aat] Flush rest of buffer if state machine failed 2018-01-12 11:42:25 +01:00
Behdad Esfahbod 25364c4f00 [aat] Fix symbol visibility
Not sure why only one of the bots sees this as visible...
2018-01-12 11:31:20 +01:00
Behdad Esfahbod ee16b9d8d3 Revert accidental morx enablement 2018-01-12 11:28:09 +01:00
Behdad Esfahbod cdfa801ff4 [aat] Tweak previous commit 2018-01-12 11:12:20 +01:00
Behdad Esfahbod f7600228a4 [aat] Detect infinite-loops in state machine 2018-01-12 11:09:21 +01:00
Behdad Esfahbod dd38db523a [aat] Fix more builds
Maybe I should disable C++11 detection such that my compiler also catches
these.  Doesn't look like we can switch to it for a while anyway...
2018-01-12 09:45:42 +01:00
Behdad Esfahbod 72cb2b1f57 [aat] Fix builds 2018-01-12 09:38:55 +01:00
Ting-Wei Lan e3a15d0c6d Update _POSIX_C_SOURCE to the latest version
Defining _POSIX_C_SOURCE to an old version on FreeBSD can cause C99 to
be disabled in libc.
2018-01-12 09:19:41 +01:00
Behdad Esfahbod c70d58f97d [aat] Port RearrangementSubtable to StateTableDriver 2018-01-12 00:08:22 +01:00
Behdad Esfahbod 117cfe7bb7 [aat] Add StateTableDriver and convert ContextualSubtable to it 2018-01-12 00:01:36 +01:00
Behdad Esfahbod 1f1c85a54a [aat] Remove 'mort' support
It's dead, Jim!
2018-01-11 22:43:57 +01:00
Behdad Esfahbod 7e2fed6d73 [aat] Allow DontAdvance
Apparently CoreText does allow these.  To be done: detect infinite
loops.

Fixes MORX-12 test.
2018-01-11 19:25:21 +01:00
Behdad Esfahbod 17f01aff91 [aat] Sanitize ContextualSubtable 2018-01-11 18:54:49 +01:00
Behdad Esfahbod 9b82aa19d8 More warning fixes 2018-01-11 18:19:42 +01:00
Behdad Esfahbod 680cbc2eb3 [aat] Sanitize StateTable 2018-01-11 18:15:53 +01:00
Behdad Esfahbod 0e3b3379a0 [aat] Actually fix d887f93148 2018-01-11 18:01:10 +01:00
Behdad Esfahbod 3f291ffd5a [buffer] Fix compiler warnings
line 323: Warning: info hides hb_buffer_t::info
...
2018-01-11 17:57:46 +01:00
Behdad Esfahbod d887f93148 [aat] Make bots happy
Don't know why this is not caught by my compiler.  Looks like clang catches it
while gcc doesn't.

In file included from ../src/hb-aat-layout-morx-table.hh:31:
../src/hb-aat-layout-common-private.hh:523:30: error: no member named 'static_size' in 'AAT::ContextualSubtable<AAT::MorxTypes>::EntryData'
  DEFINE_SIZE_STATIC (4 + T::static_size);
                            ~~~^
2018-01-11 17:41:34 +01:00
Behdad Esfahbod f6be730994 [aat] In NoncontextualSubtable, handle MarkLast with end-of-line transition
Fixes MORX-11 test.
2018-01-11 15:23:24 +01:00
Behdad Esfahbod f9be673814 [aat] Implement ContextualSubtable
Tested with Zapfino and text "2nd". Sascha will create tests later.
2018-01-11 15:15:36 +01:00
Behdad Esfahbod 335a9c1fe4 [aat] Towards implementing ContextualSubtable 2018-01-11 15:15:36 +01:00
Behdad Esfahbod 62348f647f [aat] Implement end-of-text in state machine
Passes MORX-10 test now.
2018-01-11 15:15:36 +01:00
Behdad Esfahbod 9adbd938fa Minor 2018-01-11 15:15:36 +01:00
Behdad Esfahbod 94644d7ea4 [aat] Generate finegrained unsafe-to-break in state-machine!
Neato.
2018-01-11 11:49:07 +01:00
Behdad Esfahbod 994eb7744c [buffer] Fix crash 2018-01-11 11:37:12 +01:00
Behdad Esfahbod 7c32e01d04 Minor 2018-01-11 10:47:31 +01:00
Behdad Esfahbod 14b4d84eef [aat] Fix RearrangementSubtable action 2018-01-11 10:43:30 +01:00
Behdad Esfahbod 800e4ae802 [aat] Mark state-machine-based lookup as completely unsafe-to-break
To be improved later.
2018-01-11 10:43:30 +01:00
Behdad Esfahbod ca42d96129 [aat] Implement RearrangementSubtable 2018-01-11 10:43:30 +01:00
Ebrahim Byagowi 5dbbd0fdb9
Move the #define of _GNU_SOURCE to the top of hb-private.hh (#697)
This fixes the build on Cygwin.
2018-01-11 12:33:22 +03:30
Behdad Esfahbod 80fd574320 [aat] Add Class subtable thingy
From old 'mort' table.
2018-01-10 13:58:41 +01:00
Khaled Hosny 0b22da9541 Improve HB_BUFFER_SERIALIZE_FLAG_NO_ADVANCES docs
Add the note about absolute glyph positions from the commit message.
2018-01-10 07:12:07 +02:00
Behdad Esfahbod 188ee6e5ee Calculate anchor positions in float, then round
Hoping to reduce rounding error, to make tests happier...
No luck.
2018-01-10 05:13:47 +01:00
Behdad Esfahbod 7cdd6ab068 Round, instead of floor, when applying variations
Hoping this would fix remaining text-rendering-tests failures,
but so far no luck.
2018-01-10 04:44:33 +01:00
Behdad Esfahbod 3b1e97f364 Add HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES
New API:
HB_BUFFER_FLAG_REMOVE_DEFAULT_IGNORABLES
hb-shape / hb-view --remove-default-ignorables

One more text-rendering-tests test passing.  Eleven failing.
2018-01-10 03:36:03 +01:00
Behdad Esfahbod 6b19178ee3 Prefix int types with HB
Such a headache that Windows defines UINT8, ...; Just prefix it.
2018-01-10 03:07:30 +01:00
Behdad Esfahbod 81e321c802 [aat] Try fixing VC bots
c:\projects\harfbuzz\src\hb-aat-layout-common-private.hh(51): error C2872: 'UINT16': ambiguous symbol [C:\projects\harfbuzz\build\harfbuzz.vcxproj]
C:\Program Files (x86)\Windows Kits\10\Include\10.0.14393.0\shared\basetsd.h(80): note: could be 'unsigned short UINT16'
c:\projects\harfbuzz\src\hb-open-type-private.hh(648): note: or       'OT::UINT16'
2018-01-10 02:56:29 +01:00
Behdad Esfahbod 0ed69c9462 Disable processing of morx table in ot shaper
So I can merge this to master...
2018-01-10 02:50:49 +01:00
Behdad Esfahbod 5f94b4cc39 [kern] Mark unsafe-to-break 2018-01-10 02:50:49 +01:00
Behdad Esfahbod 71fd6325b6 Add option to buffer serialization to not output glyph advances
When advances are not printed, glyph offsets reflect absolute glyph
positions.

New API:
HB_BUFFER_SERIALIZE_FLAG_NO_ADVANCES
hb-shape --no-advances
2018-01-10 02:50:49 +01:00
Behdad Esfahbod 748b989a1f [aat/morx] Implement NoncontextualSubtables
Also makes hb-ot-shape call morx for now instead of GSUB... Just for testing.
2018-01-10 02:50:49 +01:00
Behdad Esfahbod 4cf3ab1d81 Minor 2018-01-10 02:50:49 +01:00
Behdad Esfahbod 470fe5b603 [aat] Implement Lookup table
Untested, but compiles.
2018-01-10 02:50:49 +01:00
Behdad Esfahbod 4646a80a87 Minor 2018-01-10 02:50:49 +01:00
Behdad Esfahbod 7c7cb42d81 [aat] Update previous commits for rebase on master 2018-01-10 02:50:49 +01:00
Behdad Esfahbod a0175e75bc [aat] Start implementing common table formats 2018-01-10 02:50:49 +01:00
Behdad Esfahbod c71b55a223 [aat] Start implementing Apple AAT morx table 2018-01-10 02:50:49 +01:00
Behdad Esfahbod 0473d95e27 [ft] Use FT_Done_MM_Var() if available 2018-01-08 10:07:46 +00:00
Behdad Esfahbod 66d7beff96 [khmer] Relax!
Apparently we don't use OT_A either.
2018-01-05 18:10:25 +00:00
Behdad Esfahbod db0207baff [khmer] Drop another joiner 2018-01-05 18:06:00 +00:00
Behdad Esfahbod 90affe831f [khmer] Shuffle 2018-01-05 18:04:56 +00:00
Behdad Esfahbod 65795e3ca2 [khmer] Simplify grammar some more
Numbers down (from 38):

KHMER: 299090 out of 299124 tests passed. 34 failed (0.0113665%)
2018-01-05 18:03:00 +00:00
Behdad Esfahbod e13ee93731 [khmer] Clean 2018-01-05 18:01:01 +00:00
Behdad Esfahbod a71c7eb2ca [khmer] Limit number of joiners 2018-01-05 17:59:43 +00:00
Behdad Esfahbod 574e42e1cf [khmer] Relax number of consonants / matras allowed
New numbers (down from 39):

KHMER: 299086 out of 299124 tests passed. 38 failed (0.0127038%)
2018-01-05 17:58:02 +00:00
Behdad Esfahbod 80c870bcda [khmer] Allow Independent Vowels where stacked consonants are allowed
New numbers (down from 44):

KHMER: 299085 out of 299124 tests passed. 39 failed (0.0130381%)
2018-01-05 17:54:52 +00:00
Behdad Esfahbod 9bd486c480 [khmer] Drop some more joiners 2018-01-05 17:47:35 +00:00
Behdad Esfahbod 5278265853 [khmer] Drop some more 2018-01-05 17:46:49 +00:00
Behdad Esfahbod efefd87f33 [khmer] Drop some more grammar 2018-01-05 17:45:48 +00:00
Behdad Esfahbod 82e6bf8e0c [khmer] Drop some more from grammar 2018-01-05 17:44:18 +00:00
Behdad Esfahbod 957e8ea8a9 [khmer] Drop final_halant_group 2018-01-05 17:43:31 +00:00
Behdad Esfahbod bbfdbbdc5e Minor 2018-01-05 17:34:26 +00:00
Behdad Esfahbod f6df251521 [indic] Remove unused OT_VD category 2018-01-05 17:27:48 +00:00
Behdad Esfahbod e6618f3bdf [khmer] Shave off some more from the grammar 2018-01-05 17:27:42 +00:00
Behdad Esfahbod 014494d5c0 [khmer] Remove unused symbol clusters 2018-01-05 17:18:12 +00:00
Behdad Esfahbod bbac984b93 Minor 2018-01-05 17:15:31 +00:00
Behdad Esfahbod 185b68946a [khmer] Remove medials from grammar 2018-01-05 17:14:27 +00:00
Behdad Esfahbod c265dffdf6 [khmer] Better fix for dangling final Coeng
This is how 1471cfee3b should have
been done.
2018-01-05 17:06:29 +00:00
Behdad Esfahbod e3fdf1fc2f [khmer] Remove reph/repha support from grammar 2018-01-05 17:05:53 +00:00
Behdad Esfahbod 0d3a274de1 [khmer] Remove forced_rakar from grammar
Used by Sinhala only.
2018-01-05 17:01:37 +00:00
Behdad Esfahbod 1471cfee3b [khmer] Allow a dangling final Coeng after matras
Uniscribe seems to allow that.  New numbers:

KHMER: 299080 out of 299124 tests passed. 44 failed (0.0147096%)
2018-01-05 16:34:20 +00:00
Behdad Esfahbod 9eaf077ded [khmer] Remove some more unused code 2018-01-05 16:28:00 +00:00
Behdad Esfahbod bfad6ab897 [khmer] Remove features not used by Khmer 2018-01-05 16:13:09 +00:00
Behdad Esfahbod 92a99ce084 [khmer] Remove rphf feature 2018-01-05 16:08:44 +00:00
Behdad Esfahbod 238b90e77c [khmer] Remove non-Khmer matra positioning code 2018-01-05 16:06:53 +00:00
Behdad Esfahbod f8553c898a [khmer] Remove indic_config_t 2018-01-05 16:04:02 +00:00
Behdad Esfahbod a119a8bce5 [khmer] Remove indic_config->reph_mode 2018-01-05 16:02:55 +00:00
Behdad Esfahbod c135324af1 [khmer] Remove indic_config->reph_pos 2018-01-05 16:02:55 +00:00
Behdad Esfahbod ffcd6c7efd [khmer] Remove indic_config->base_pos 2018-01-05 15:50:05 +00:00
Behdad Esfahbod 0c91638d48 [khmer] Remove other scripts 2018-01-05 15:45:30 +00:00
Behdad Esfahbod 4c0199c573 [khmer] Remove indic_config->script 2018-01-05 15:43:48 +00:00
Behdad Esfahbod 9b135d9524 [khmer] Remove indic_config->virama 2018-01-05 15:43:11 +00:00
Behdad Esfahbod 7eb3ac29d3 [khmer] Remove indic_config->has_old_spec 2018-01-05 15:41:31 +00:00
Behdad Esfahbod 961ebf85f1 [khmer] Remove Halant from Khmer shaper 2018-01-05 15:36:53 +00:00
Behdad Esfahbod 9761f9d782 [indic] Remove more Khmer-specific stuff from Indic shaper
No numbers changed.
2018-01-05 15:33:11 +00:00
Behdad Esfahbod 0758953644 [indic] Remove main Khmer stuff 2018-01-05 15:08:28 +00:00
Behdad Esfahbod dcf4d95fea [khmer] Split off Khmer shaper from Indic
Towards fixing https://github.com/harfbuzz/harfbuzz/issues/667
The Khmer spec is different enough from other Indic ones to require
its own grammar.

No change in functionality.  Test numbers are:

BENGALI: 353725 out of 354188 tests passed. 463 failed (0.130722%)
DEVANAGARI: 707307 out of 707394 tests passed. 87 failed (0.0122987%)
GUJARATI: 366355 out of 366457 tests passed. 102 failed (0.0278341%)
GURMUKHI: 60729 out of 60747 tests passed. 18 failed (0.0296311%)
KANNADA: 951300 out of 951913 tests passed. 613 failed (0.0643966%)
KHMER: 299071 out of 299124 tests passed. 53 failed (0.0177184%)
MALAYALAM: 1048136 out of 1048334 tests passed. 198 failed (0.0188871%)
ORIYA: 42320 out of 42329 tests passed. 9 failed (0.021262%)
SINHALA: 271662 out of 271847 tests passed. 185 failed (0.068053%)
TAMIL: 1091754 out of 1091754 tests passed. 0 failed (0%)
TELUGU: 970555 out of 970573 tests passed. 18 failed (0.00185457%)
2018-01-05 14:54:31 +00:00
Behdad Esfahbod 1e05ea79d0 [ot] Short-circuit base instance advance variation 2018-01-05 14:01:37 +00:00
Behdad Esfahbod 54b2b93722 [ot] Fix VariationStore evaluation algorithm
Ouch!  Missing coords should still be evaluated as coord=0, which
most of the time results in a factor of 0.  We were skipping these,
which was equivalent to a factor of 1.

Fixes https://github.com/harfbuzz/harfbuzz/issues/652
2018-01-05 13:20:21 +00:00
Behdad Esfahbod a3afdd1e08 Minor 2018-01-05 13:17:02 +00:00
Behdad Esfahbod cb43bdbc2f [ft] If there's no variations set, don't set them on hb-font 2018-01-05 13:06:25 +00:00
Behdad Esfahbod 127bcc6ece Merge remote-tracking branch 'fdo/master' 2018-01-05 12:50:22 +00:00
Behdad Esfahbod 8c0d1916a4 Improve CGJ skipping logic
Previously we made CGJ unskippable.  Now, if CGJ did NOT prevent
any reordering, allow skipping over it.  To make this work we
had to make changes to the Arabic mark reordering algorithm
implementation to renumber moved MCM marks.  See comments.

Fixes https://github.com/harfbuzz/harfbuzz/issues/554
2018-01-05 12:48:19 +00:00
Ebrahim Byagowi 72bec1cd09
Improve tests (#679) 2018-01-05 12:42:20 +03:30
Behdad Esfahbod 293e443529 Minor 2018-01-04 16:06:25 +00:00
Bruce Mitchener 8a0952db7e atomics: Favor compiler primitives over macOS APIs. (#676)
In macOS 10.12, the `OSMemoryBarrier` and related APIs were deprecated
in favor of using `std::atomic`. On the way to supporting `std::atomic`,
we can favor using the "Intel primitives" which are also available on
macOS.
2018-01-04 15:10:10 +03:30
Ebrahim Byagowi 5ed26fc5bd
[cmake] Run src/ tests (#675) 2018-01-04 10:11:34 +03:30
Behdad Esfahbod f8daeef4c4 [use] Simplify more 2018-01-03 14:27:34 +00:00
Behdad Esfahbod 877d15e73c [use] Simplify
Fixes https://github.com/harfbuzz/harfbuzz/pull/661
2018-01-03 14:24:44 +00:00
Behdad Esfahbod 308f419215 [use] Fix Brahmi Number Joiner 1107F
Fixes https://github.com/harfbuzz/harfbuzz/pull/660
2018-01-03 14:22:07 +00:00
Bruce Mitchener 85ec6d3443 Fix typos. 2018-01-02 13:26:44 -05:00
David Corbett 7bfdf1a941 Forbid Batak killers after vowel signs 2017-12-24 14:21:22 -08:00
Behdad Esfahbod 72ecaae0ad [use] Allow ZWJ before/after Halant
https://github.com/harfbuzz/harfbuzz/issues/542#issuecomment-353169729
2017-12-24 16:05:07 -05:00
Behdad Esfahbod bc92245b68 Minor 2017-12-24 15:54:58 -05:00
Volker H. Simonis a9432bde7e HarfBuzz 1.7.1 and later don't compile on AIX with xlC (#655) 2017-12-19 20:22:24 -05:00
Behdad Esfahbod 2fe5f885b6 [set] Handle nil set in add_range() / add_sorted_array()
Fixes https://github.com/harfbuzz/harfbuzz/issues/657
2017-12-19 14:48:26 -05:00
Behdad Esfahbod 1245395a60 [coretext] In hb_coretext_font_create() set ptem
Otherwise setting the CTFont was ineffective as it would have been
recreated anyway unless font size was set to 18 CSS points.
2017-12-17 12:33:08 -05:00
Behdad Esfahbod 493a005d95 [set] In add_sorted_array(), bail if data is not sorted 2017-12-16 11:49:39 -05:00
Behdad Esfahbod a7bd6d7a4c [collect_glyphs] Bail if input data looks like garbage
Specificaly, when a range or sorted array has unexpected order, we take that as
font data being garbage and bail out.  This fixes significant slowdown on a bad
version of Chandas font which has a 600KB GPOS with garbage inside.

Later on, I like to add a maximum-work counter for collect_glyphs to protect
against malicious fonts as well.

Fixes https://bugs.chromium.org/p/chromium/issues/detail?id=794896
2017-12-16 11:39:32 -05:00
Behdad Esfahbod 1ce7d6e215 [set] Optimize add_array() / add_sorted_array()
Does page lookup as needed.
2017-12-16 11:39:11 -05:00
Behdad Esfahbod 71e6adf1e2 [collect_glyphs] handle ClassDef better 2017-12-16 11:07:37 -05:00
Behdad Esfahbod 87cc5a65cb [collect_glyphs] In PairPosFornat2 do not collect classDef1
The coverage already covered that.
2017-12-16 06:18:07 -08:00
Behdad Esfahbod 81f27df4d9 More work towards improving collect_glyphs() against bad input
The three "XXXXX"'s should be switched to false.  Doing that separately for ease
of bisecting...
2017-12-16 06:12:06 -08:00
Behdad Esfahbod 5d02572034 [set] Add add_sorted_array()
Not optimized to use sortedness yet.  Also start putting in place infra
to faster reject bad data.

A version of Chandas.ttf found on some Chrome bots has 660kb of GPOS,
mostly junk.  That is causing 48 million of set->add() calls in
collect_glyphs(), which is insane.

In the upcoming commits, I'll be speeding that up by optimizing
add_sorted_array(), while also reducing work by rejecting out-of-sort
arrays quickly and propagate the rejection.

Part of https://bugs.chromium.org/p/chromium/issues/detail?id=794896
2017-12-14 19:35:47 -08:00
Behdad Esfahbod 9d6511a734 [set] Reduce number of preallocated pages from 8 to 1
Now that pagesize is 8192, this feels better.
2017-12-14 19:07:17 -08:00
Behdad Esfahbod ae2e2b068e Fix partial tracing debug builds 2017-12-14 19:07:17 -08:00
Behdad Esfahbod 9daa88cd79 Minor 2017-12-14 19:07:17 -08:00
Behdad Esfahbod f424a34223 [set] Change pagesize from 512 bits to 8192 bits
Fixes perf regression on some heavy fonts in Chrome's FT+HB
interaction.

See:
https://bugs.chromium.org/p/chromium/issues/detail?id=782220

More work to be done:
https://bugs.chromium.org/p/chromium/issues/detail?id=794896
2017-12-14 13:30:38 -08:00