f2b9065246
[repacker] for ext promotion choose lookups from highest subtables per byte to lowest.
...
Attempts to roughly maximize the number of subtables that are non-ext.
2022-07-25 21:55:03 +00:00
e4fd5ff727
[repacker] count subtable size in each group of consecutive layers for extension promotion decisions.
...
Enforce that the following groups are all <64k in size:
- LookupList + Lookups
- Lookups + SubTables
- SubTables + Descendants
2022-07-25 21:31:17 +00:00
ffb0f7936f
[repacker] add ext promotion test.
2022-07-22 22:36:04 +00:00
6fad6b4113
[repacker] add tests for special casing of 24bit offsets.
2022-07-06 19:18:27 +00:00
7078560e33
[repacker] extract graph serialization code into a seperate file.
2022-06-24 17:16:50 -06:00
20b02a672d
[repacker] Begin splitting up the repacker implementation into several files.
2022-06-24 17:16:50 -06:00
b32ca2a292
[subset-perf] remove sort_kahn from repacker.
...
Without an optimized FIFO queue implementation it's nearly as slow as the now optimized sort_shortest_distance.
2022-05-20 09:41:18 -06:00
441877f56a
[repacker] add test case for using max priority to resolve an overflow.
2021-12-09 17:46:52 -07:00
fa966bcc29
[repacker] create repacker output buffer after final length is known.
...
Don't rely on a buffer provided by the caller, as it may not be large enough.
2021-12-06 21:27:28 -07:00
9121ed0cec
[subset] Improve sharing of Ligature subtables.
...
Ligature subtables use virtual links to enforce an ordering constraint between the subtables and the coverage table. Unfortunately this has the sideeffect of prevent the subtables from being shared by another Ligature with a different coverage table since object equality compares all links real and virtual. This change makes virtual links stored separately from real links and updates the equality check to only check real links. If an object is de-duped any virtual links it has are merged into the object that replaces it.
2021-12-01 08:37:04 -07:00
5bfc7d1015
[repacker] remove VirtualOffset struct.
...
Make and add_virtual_link () specialization of add_link() instead.
2021-11-02 12:19:13 -06:00
bc4c5341d6
[repacker] Add test for virtual links in the repacker.
2021-11-02 12:19:13 -06:00
7f0ede4f04
[repacker] refactor resolve overflow tests to use a helper.
2021-10-05 13:10:01 -07:00
7883b7ed95
[repacker] Add additional splitting spaces test.
...
Fix issues it uncovered.
2021-10-05 12:46:59 -07:00
6265663de4
[repacker] add test for splitting spaces.
2021-10-05 11:30:04 -07:00
0dccbf368f
[repacker] Handle the case where a subgraph root has an incoming 32 and 16 bit edge.
...
In this case the entire subgraph from that root will be duplicated.
2021-09-29 14:28:27 -07:00
816c5302a7
[repacker] restrict 32 bit subgraph connected component search to only nodes reachable via directed links.
2021-09-28 16:04:27 -07:00
67eb222b8e
[repacker] when assigning each connected subgraph a space, also isolate it.
...
This will break any links coming from space 0 (ie. the 16 bit offset only space).
2021-09-28 13:54:54 -07:00
307acf7fb0
[repacker] add space assignment based on connected components.
...
Assign each connected component that is underneath one or more 32 bit offsets into a unique space. This ensures that 32 bit subgraphs which are connected are packed into the same space.
2021-09-28 12:08:18 -07:00
efda2f14e1
[repacker] fix bug in subgraph isolation.
...
Prior to this fix id remapping at the end of the isolation operation was fed the old subgraph instead of the new one. Which results in object indices being remapped for the nodes outside of the new subgraph. Adds a test which detects this problem.
2021-09-24 17:53:08 -06:00
9247d24d7f
[repacker] s/0/HB_TAG_NONE
2021-09-22 18:18:50 -06:00
d0daa7a59b
[repacker] add a couple more complex isolation tests.
2021-09-22 18:18:50 -06:00
58facaade1
[repacker] put each 32 bit subgraph into it's own packing space.
...
Each subgraph pointed to by a 32 bit offset should be packed into it's own space. This adds a space property to vertices which affects the distance calculation. This effectively places the distances for all of the nodes of a 32 bit subgraph into a distinct range. Thus all of the nodes of the subgraph will be packed together.
2021-09-22 18:18:50 -06:00
543a3f9733
[repacker] Add repacker test for subgraph isolation.
2021-09-22 18:18:50 -06:00
41bbf2812e
[repacker] do extension subtable isolation before starting resolution attempts.
2021-09-22 18:18:50 -06:00
bb48bf52a4
Rename misc uses of "free"
...
In preparation for fixing https://github.com/harfbuzz/harfbuzz/issues/3044
2021-07-08 10:54:09 -07:00
73ed59f7a6
[subset] store errors in the serializer as a flag set.
...
Make check_assign/check_equal specify the type of error to set.
2021-03-17 15:58:34 -07:00
e2f14e81bd
[subset] fix memory leaks in test-repacker.
2021-03-17 15:53:58 -07:00
a7a86a6eb4
[subset] Add prioritization offset resolution.
...
Vertices can now be prioritized to force them to sort closer to their parent. The resolver will attempt to use this for overflows on non-shared vertices.
2021-03-17 15:53:58 -07:00
b452b2c76c
[subset] refactor repacker graph to cache edge count and distances of vertices.
2021-03-17 15:53:57 -07:00
75414e82b5
[subset] Add table duplication overflow resolution.
2021-03-17 15:53:57 -07:00
4c8dd41ed9
[subset] re-write compute distances to use an array lookup for the distance map.
2021-03-17 15:53:57 -07:00
aaa7873d42
[subset] add topological sort by closest distance via Dijkstra's algorithm.
2021-03-17 15:53:57 -07:00
8ebe5d734f
Implement will_overflow ().
2021-03-17 15:53:57 -07:00
f4c78cc7dd
[subset] Implement Kahn's algo for topological sorting instead of BFS.
2021-03-17 15:53:57 -07:00
00f393dc3f
[subset] finish up BFS sort implementation.
2021-03-17 15:53:57 -07:00
1584d3cb8f
[subset] Start a proof of concept implementation of the GSUB/GPOS offset overflow resolver.
2021-03-17 15:53:57 -07:00
Garret Rieger
Behdad Esfahbod