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Hash : b04db387
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Date : 2025-07-04T19:52:53
[sfnt] Rewrite GPOS kerning support. (2/2) The previous code had a fundamental flaw: it didn't validate the necessary parts of the 'GPOS' table before accessing it, causing crashes with malformed data (since `TT_CONFIG_OPTION_GPOS_KERNING` is off by default, standard fuzzers don't catch these problems). Additionally, it did a lot of parsing while accessing kerning data, making it rather slow. The new implementation fixes this. After validation, offsets to the 'GPOS' lookup subtables used in the 'kern' feature that correspond to 'simple' kerning (i.e., similar to 'kern' table kerning) are stored in `TT_Face`; this greatly simplifies and accelerates access to the kerning data. Testing with font `SF-Pro.ttf` version '1.00', the validation time for the 'GPOS' table increases the start-up time of `FT_New_Face` by less than 1%, while calls to `FT_Get_Kerning` become about 3.5 times faster. * include/freetype/internal (gpos_kerning_available): Replace with... (gpos_lookups_kerning, num_gpos_lookups_kerning): ... these new fields. Update callers. * src/ttgpos.c [TT_CONFIG_OPTION_GPOS_KERNING]: A new implementation.
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README
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After saying `make refdoc' or `make refdoc-venv' the `reference/' directory contains the FreeType API reference. You need Python >= 3.5 and pip to make this target. There are two ways to generate the documentation: 1. Using `make refdoc': - Ensure `python' and `pip' are available. - Install pip package `docwriter' with `pip install --user docwriter'. - Make target with `make refdoc'. - This target can be run offline once required packages are installed. 2. Using `make refdoc-venv' (requires internet access): - Ensure `python', `pip' and Python package `virtualenv' are available. - Make target with `make refdoc-venv'. - This may or may not require internet access every time depending on pip and system caching. Some troubleshooting tips: * Regularly run `pip install --upgrade docwriter' to check for updates which may include bug fixes. * `Docwriter' does not support Python 2. Ensure that Python >= 3.5 is installed and available as `python3'/`python'. * Ensure that `docwriter' is installed in the same Python target that `make refdoc' uses (python3/python). * If none of this works, send a mail to `freetype-devel@nongnu.org' or file an issue at `https://github.com/freetype/docwriter/issues'.