On Mon, 2009-01-05 at 19:16 +0000, Peter Clifton wrote: > In case anyone's interested, remaining pango issues: > > Metric hinting.. or not. On means we have to recompute text bounds at > every zoom level change, but output is legible. Output varies in exact > position w.r.t other objects on page with zoom level changes. > > Glyph outline hintning.. various levels of. Turn it off, you have > blurry > font outlines. Turn it on without metric hinting, and you get bad > kerning of characters, which also makes things harder to read. > > Stroke thinning at low zoom levels.. Sometimes the pango rendered > output > is more legible than the cairo rendering of gschem't font.. other > times > not. The pango glyphs start to fade very quickly, once you reach a > particular zoom level. I can't really see how to avoid it though. > Pango > (or cairo - not sure which) keeps reducing the stroke width below 1px > size, even with full glyph hinting switched on. > > Should we tie the magic scale factor (about 1.3) to the same scale > factor used for postscript printing? It is probably going to be the > same > number. > > How can we keep printing support in step with the stuff pango can > render > for us? (That might require a major shake up; using cairo for > printing).
More issues: Probably not using the right point for vertical text alignment. That code's a mess, and needs yet more attention. (Its been the main grief of all the text rendering updates - at least it looks right visually now.) Probably invalidating the wrong bounds on screen - related to above, and to positioning of over-bars. Overbar rendering leaves ~1px gaps between overbars rendered as separate, but adjacent runs of text. (E.g. if you have a tab under the overbar). Might just need to +1 to right-most rendered X coordinate of the bar. It's almost certainly broken in various subtle / non-sublte ways for right-to-left, and vertical text layouts, but I'll leave those for another release! > Best regards, > -- Peter Clifton Electrical Engineering Division, Engineering Department, University of Cambridge, 9, JJ Thomson Avenue, Cambridge CB3 0FA Tel: +44 (0)7729 980173 - (No signal in the lab!) _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
