thanks a lot guys. i am looking at the GdkPixmap depth issue in DiaGdkRenderer now. i will also look into stefan's other idea about pixmap regions being drawn then overdrawn without clearing (before drawing the text)...
can i say wow? ...it sure did not take you long to find that stefan... On Apr 2, 2005 12:44 PM, Lars Clausen <[EMAIL PROTECTED]> wrote: > On Fri, 2005-04-01 at 10:32 +0200, Stefan wrote: > > some minutes ago I observed the bahaviour on drawing text with > > gdk_pixbuf_render_to_drawable_alpha() in diagdkrenderer.c:draw_string(). > > Supporting that, I used a fix alpha threshold in 'pixels[i*stride+j*4+3] > > = graybitmap[i*rowstride+j];', i.e. 128. And what I explored is, that in > > the situations the font is drawn ugly, now the intensity of the color > > incresed. So ... there are some regions are still drawn and are > > overdrawn by this method. The transparency then causes the uglyness and > > egdy font. > > That sounds much more like something that could actually cause this bug > that what we've look at before. > > > So the problem is actually a problem with uninvalidated, still present > > regions in renderer->pixmap which have to be cleared, before redrawing > > the text again. The update-area logic doesn't pay attention on this. > > Notably, the effect also happens under libart renderer. Which makes > sense with the explanation. > > -Lars > > -- > Lars Clausen <[EMAIL PROTECTED]> > > _______________________________________________ > Dia-list mailing list > [email protected] > http://mail.gnome.org/mailman/listinfo/dia-list > FAQ at http://www.gnome.org/projects/dia/faq.html > Main page at http://www.gnome.org/projects/dia > > _______________________________________________ Dia-list mailing list [email protected] http://mail.gnome.org/mailman/listinfo/dia-list FAQ at http://www.gnome.org/projects/dia/faq.html Main page at http://www.gnome.org/projects/dia
