Hi! people in #qt-labs directed me here. I'm working on FreeType and want to merge a new API (FT_Face_Option) that would allow setting LCD filter weights and stem darkening properties on a per-face basis. The goal is to enable toolkits like Qt to finally turn on linear alpha blending and gamma correction on X11/Wayland for font rendering without users filing bugs like https://bugreports.qt.io/browse/QTBUG-41590. Stem darkening thickens glyphs depending on pixel size and the font design itself to prevent them from thinning out with LAB+GC. This would properly solve the above bug.
A side issue this is trying to solve is making the API thread-safer, i.e. threads can now toggle stem darkening and modify LCD filter weights directly on their own FT_Face object without contending for a shared FT_Library or the font-driver-wide setting. I'd love to get feedback on the API before we make it official because I want to make sure it's actually useful in practice. The patches for FT are the top 3 commits at https://github.com/madig/freetype2/commits/stem-darkening-api. You can clone the repo somewhere and modify your compiler's include directives to look for FreeType there, then load the new library with `LD_PRELOAD=/somewhere/freetype2/objs/.libs/libfreetype.so some-application`. API usage examples are at https://github.com/madig/freetype2/commit/297b68621c020c8d6e61a04b8e91ac829a6bc13d#diff-9a8d509c02006aa497c68bcbcd32d505R3618 Best regards, Nikolaus _______________________________________________ Development mailing list Development@qt-project.org http://lists.qt-project.org/mailman/listinfo/development
