[Wearing the FreeType maintainer hat] Subpixel positioning of glyphs is not patented. The special handling of TrueType bytecode instructions for ClearType isn't patented either. However, Microsoft has patented a certain colour filter for ClearType to display fonts on LCD screens, which can be easily circumvented by using a slightly different colour filter. AFAIK, X11 already does that.
So, with this hat on, you would confirm the current subpixel rendring in freetype is OK to use as default? Or any underlying issues?
If you want to avoid patent issues, you must not activate FT_CONFIG_OPTION_SUBPIXEL_RENDERING. However, it is trivial to increase the horizontal resolution by a factor of three (or whatever is appropriate for your implementation), then applying your own filtering to fold this into a proper LCD representation. The old Antigrain article at http://www.antigrain.com/research/font_rasterization/ explains how to do this, for example. Note that I don't follow the X11 development, so I can just guess its current state. Werner -- To unsubscribe, e-mail: opensuse-factory+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-factory+owner@opensuse.org