From: Tom C. <tho...@tr...> - 2008-04-09 07:39:12
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On Tuesday 08 April 2008 17:59:45 Hal Glenn wrote: > Hey Peter, > From my understanding, the directfb takes advantage of the PXA hardware > graphics acceleration features that the linuxfb and qt core do not. > Sense qtcore does not know about the chip set the frame buffer is > running on it can't possibly know how to use it's hardware accelerated > features, where as the directfb software should be set up specify for this. > The DirectFB API does include things like blits etc. which Qt/Embedded uses. They may not be accelerated on the pxa however - it's down to the underlying driver & hardware. I'm not sure if the PXA270 even has a hardware blitter. You may also notice a speed up with 4.4.0 over 4.3.3 as I've explained in previous posts. I would be very interested to hear if you do notice any performance differences between 4.3.3 & 4.4.0, good or bad. Cheers, Tom |
From: Hal G. <hg...@2g...> - 2008-04-11 22:21:22
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Hey Tom, I've had to drop back to QT 4.3.1 for my testing now because that's the one I can get PYQT4 to work with. I'll let you know if i see any marked differences though. Hal Tom Cooksey wrote: > On Tuesday 08 April 2008 17:59:45 Hal Glenn wrote: > >> Hey Peter, >> From my understanding, the directfb takes advantage of the PXA hardware >> graphics acceleration features that the linuxfb and qt core do not. >> Sense qtcore does not know about the chip set the frame buffer is >> running on it can't possibly know how to use it's hardware accelerated >> features, where as the directfb software should be set up specify for this. >> >> > The DirectFB API does include things like blits etc. which Qt/Embedded uses. > They may not be accelerated on the pxa however - it's down to the underlying > driver & hardware. I'm not sure if the PXA270 even has a hardware blitter. > > You may also notice a speed up with 4.4.0 over 4.3.3 as I've explained in > previous posts. I would be very interested to hear if you do notice any > performance differences between 4.3.3 & 4.4.0, good or bad. > > > Cheers, > > Tom > > ------------------------------------------------------------------------- > This SF.net email is sponsored by the 2008 JavaOne(SM) Conference > Don't miss this year's exciting event. There's still time to save $100. > Use priority code J8TL2D2. > http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > |