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Hash : 2175f5d0
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Date : 2023-04-24T21:13:18

[subset] Fix inefficient ItemVariationStore subsetting w/ retain_gids.

ItemVariationStore is relying on the assumption that the inner_map is populated for all output glyphs, this is not true for subsetting operations with retain gids enabled. Fixes fuzzer timeout: https://oss-fuzz.com/testcase-detail/4575222591520768.

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README.md
To build the fuzzers with libFuzzer to perform actual fuzzing, build with:
```
CXX=clang++ CXXFLAGS="-fsanitize=address,fuzzer-no-link" meson fuzzbuild --default-library=static -Dfuzzer_ldflags="-fsanitize=address,fuzzer"

ninja -Cfuzzbuild
```
Then, run the fuzzer like this:

fuzzbuild/test/fuzzing/hb-{shape,draw,subset,set}-fuzzer [-max_len=2048] [CORPUS_DIR]

Where max_len specifies the maximal length of font files to handle. The smaller the faster.

For more details consult the following locations:
- http://llvm.org/docs/LibFuzzer.html

kc3-lang/harfbuzz/test/fuzzing

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README.md