Alexandre Franke wrote: > Hi, > > We are using STi7109 from ST Microelectronics with the STAPI M6 DirectFB > driver. > According to their documentation, the 2d blitter should be able to blit at > 200MPixels/sec. We enable hardware acceleration and have some performance > issue. > We have a small test program that shows the time taken by several functions > and > it appears that Blit is particularly slow, taking a bit more than 3 seconds > for > a 2MPixels image (1920*1080), which is roughly 300 times slower than expected. > We also tried with hardware acceleration disabled and it takes nearly half the > time it takes with acceleration enabled (alright, it is faster without > hardware acceleration than with it).
Blending seems to cause software fallbacks on the system. You can verify that by using the "no-software" option, if your DirectFB version is recent enough. If you use hardware acceleration on a surface it is stored in video memory and subsequent software fallbacks will read from video memory. If you disable all acceleration, surfaces stay in system memory and you will get better blend performance. It would be good the check the hardware capabilities and optimize the application. When do you need blending of the whole frame? -- Best regards, Denis Oliver Kropp .------------------------------------------. | DirectFB - Hardware accelerated graphics | | http://www.directfb.org/ | "------------------------------------------" _______________________________________________ directfb-users mailing list [email protected] http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-users
