Hi! > -----Ursprüngliche Nachricht----- > Von: Phil Endecott [mailto:[EMAIL PROTECTED] > Gesendet: Mittwoch, 03. Jänner 2007 00:22 > An: Unger Richard > Cc: [email protected] > Betreff: Re: AW: [directfb-users] Rotate JPEGs or text? Limit > on amount ofvideomemory? > > Unger Richard wrote: > > Though I am unsure how well it works, as I have not tried > it myself, in theory cairo should support rotated text. There > exists a DirectFB backend for cairo. Image rotation should > also be possible via cairo. > > Thanks for the suggestion. Cairo is rather heavyweight for > what I'm trying to acheive, though. >
:) Yes, I know what you mean... > I have got rotated images working by manually copying from > one surface to another, as dfbsee does and as suggested by > Sven Neumann. This doesn't seem to noticeably slow down my > application, which is good. If you're really tight on memory and coding your own rotation algorithms, I seem to remember from Uni that is not that hard to transpose a matrix "in place", using a fairly simple recursive routine IIRC. Would only work for "square" images though... :) > Unfortunately I don't think it's possible to use this > technique for text except by drawing the text into a > temporary surface, rotating it as I currently do for images, > and then copying that to the destination. Hmm. > As a workaround you can certainly do what you suggest! Just out fo interest, why rotate the text at all? I can certainly see the need to rotate the images to make them match the frame's orientation, but you control the orientation of the text as you draw it, so as long as you composite the text with the rotated image, there is no need to rotate it? Richard Unger > > Phil. > > > > > _______________________________________________ directfb-users mailing list [email protected] http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-users
