<div class="gmail_quote">On Oct 30, 2007 3:05 PM, Keith Packard <<a href="mailto:keithp@keithp.com">keithp@keithp.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Sazanami Mincho is a Japanese font which offers several bitmap strikes, however coverage of those strikes is not complete. If the first glyph has a bitmap version, cairo assumes that all of the glyphs will and creates the font in A1 format. However, glyphs which do not have bitmap strikes will get mis-rendered as they are first drawn to an A8 image and then poorly copied to A1. However, if the first glyph does not have a bitmap strike, it will be drawn anti-aliased, and all of the remaining glyphs will end up getting copied to an A8 surface. It seems like we have three options:  1) Identify bitmap strike sizes and draw all glyphs as A1 surfaces.  2) Draw bitmap glyphs as bitmaps and other glyphs as A8 surfaces.  3) Identify whether a bitmap strike is complete and if not, create    all glyphs as A8 glyphs in case a non-bitmap glyph is requested. The first would require that we discover bitmap strikes in the FreeType backend and turn off the antialias flag. I think this is fairly simple to do. The second would require splitting the font into two objects; XRender glyphsets can only be in a single format. This seems like slightly more work, but certainly not impossible. </blockquote></div>I implemented option 2 in 2006, but was rejected due to its 'complexity'。I attach my old patch here, obviously, it will not be applied any more, that file has been changed a lot :).