On 05/25/2010 08:11 AM, Gerd Hoffmann wrote: >> - You should register a Display Allocator and override the >> create_displaysurface() method like I did in the DirectFB driver. >> This way you save qemu a data copy. fbdev_render_32() should only be >> used when the guest framebuffer is not compatible with the physical >> framebuffer (guest_bpp != physical_bbp || guest_linesize != >> physical_linesize). > > Isn't a trivial move though. If the console is switched you must stop > drawing on the framebuffer. > > Right now this is easy: just stop copying. Likewise restoring the > screen when switching back is easy: just copy everything. > > If we give out pointers to the framebuffer to other qemu code which > doesn't know anything about console switching we have to be quite > careful get things right ... >
When loosing the focus, you can force display surface reallocation by calling hw_invalidate(), this way you can give qemu a temporary pointer to prevent drawing on the framebuffer. When switching back, you just have to copy the content of the temporary pointer location to the framebuffer. Cheers, Julian Pidancet
