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.
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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.
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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
c77bdf1dcf
[repacker] begin storing each nodes parents.
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Will be used for connected component search.
2021-09-27 14:42:54 -07:00
efda2f14e1
[repacker] fix bug in subgraph isolation.
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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
fe155de989
[repacker] handle a couple of duplication edge cases.
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- Detect cases where there are multiple links from a parent to a child. Don't duplicate that child if those are the only remaining links to the child.
- Correctly handle isolating a subgraph where the root idx has multiple incoming links.
2021-09-22 18:18:50 -06:00
c19ec97da7
[repacker] reduce the bits used by order by 2 to give more bits to distance.
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
62c502cd9d
[repacker] correctly update incoming_edges in duplicate.
2021-09-22 18:18:50 -06:00
a57ef8df7e
[repacker] default space to 0.
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Since vector push() init's new objects to all zeros.
2021-09-22 18:18:50 -06:00
58facaade1
[repacker] put each 32 bit subgraph into it's own packing space.
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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
7147f169d6
[repacker] recursively duplicate nodes during isolation.
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If a node is duplicated during isolation then any children it has will have incoming links from outside the subgraph (from the duplicated node and the original node), so they must be duplicated too.
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
8d8b7458a4
[repacker] extract overflows processing into its own method.
2021-09-22 18:18:50 -06:00
b14b3f13ba
[repacker] begin implementing the ability to isolate extension subtables.
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Adds isolate_subgraph operation to the repacker. This severs any links from outside a subgraph by duplicating the affected vertices. This will be used to isolate the subgraphs of a extension subtable from the rest of object graph. Thus allowing the extension subtable to be packed far away from the rest of the objects.
2021-09-22 18:18:50 -06:00
02c4a516db
Add a debug message when offset overflow resolution fails.
2021-09-22 18:18:50 -06:00
74f96d9d4b
[repacker] fix heap use after free in repacker.
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Don't store a reference to the link in overflow records as the link object may be freed if the sorted graph vector is resized.
2021-09-19 09:06:17 -06:00
2337f0d047
Internally use hb_malloc/.../hb_free instead of malloc/.../free
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Redefining those stock names as macros was conflicting with gcc 10
headers.
Fixes https://github.com/harfbuzz/harfbuzz/issues/3044
2021-07-08 10:54:09 -07:00
5e0ec33b3d
Error when link width not in [2, 4]
2021-05-12 16:05:11 -06:00
b23f29bf05
[subset] Add subset () method for COLRv1 Paint tables, BaseGlyphV1List and LayerV1List
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Also add support for Offset24 in serializer and repacker
2021-05-12 16:05:11 -06:00
ec4321068b
[subset] fix infinite loop caused by alloc failure in repacker.
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Fixes: https://oss-fuzz.com/testcase-detail/5609112151916544 .
2021-04-20 13:18:07 -06:00
0e845d973e
[subset] fix memory leak in repacker caused by failed alloc.
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Fixes: https://oss-fuzz.com/testcase-detail/5616763250278400 .
2021-04-20 13:18:07 -06:00
71d6d15600
[subset] clamp distance to prevent shifting outside of the limits of int64.
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Fixes https://oss-fuzz.com/testcase-detail/4961171477233664 .
2021-04-06 11:48:39 -06:00
c5c13006a1
[subset] fix memory leaks found in https://oss-fuzz.com/testcase-detail/5179935334465536
2021-03-31 12:37:45 -06:00
3827a3eb56
[subset] rename serializer::set_error() to err().
2021-03-18 11:20:03 -07:00
f561fa6e4c
Change priority queue to use (priority, value) instead of (value, priority).
2021-03-18 11:13:47 -07:00
b14475d2ae
[subset] further changes to serializer error handling.
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- Rename enum type and enum members.
- in_errors() now returns true for any error having been set. hb-subset now looks for offset overflow only errors to divert to repacker.
- Added INT_OVERFLOW and ARRAY_OVERFLOW enum values.
2021-03-18 10:51:26 -07:00
73ed59f7a6
[subset] store errors in the serializer as a flag set.
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Make check_assign/check_equal specify the type of error to set.
2021-03-17 15:58:34 -07:00
cf79fc342d
[subset] limit priority bumps to 16.
2021-03-17 15:53:58 -07:00
d3e2ba7c01
[subset] comment cleanup in hb-repacker.hh
2021-03-17 15:53:58 -07:00
bb5c80a7c2
[subset] add error tracking to the repacker.
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Also check for allocation failures as needed.
2021-03-17 15:53:58 -07:00
6e9468fcfb
[subset] cleanup memory leaks in the repacker.
2021-03-17 15:53:58 -07:00
a7a86a6eb4
[subset] Add prioritization offset resolution.
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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
8286bd8094
[subset] use vectors instead of hashmaps throughout the repacker since all keys will be mapped for these use cases.
2021-03-17 15:53:57 -07:00
519ae96617
[subset] switch sort_shortest_distance() to use priority queue.
2021-03-17 15:53:57 -07:00
5d3511e5b1
[subset] Change compute_distances() to use a priority queue.
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
Qunxin Liu