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cirrus: avoid resetting vga dirty logging unnecessarily (Avi Kivity) 

cirrus bitblt reset will stop and start dirty logging even when there is no
need; this causes full redraws.

avoid by only updating memory access when exiting cpu-to-video update mode.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6384 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2009-01-21 18:31:26 +00:00
parent ba7349cd5d
commit f8b237af00
1 changed files with 6 additions and 0 deletions
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6
hw/cirrus_vga.c
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@ -850,11 +850,17 @@ static void cirrus_bitblt_cputovideo_next(CirrusVGAState * s)
static void cirrus_bitblt_reset(CirrusVGAState * s)
{
int need_update;
s->gr[0x31] &=
~(CIRRUS_BLT_START | CIRRUS_BLT_BUSY | CIRRUS_BLT_FIFOUSED);
need_update = s->cirrus_srcptr != &s->cirrus_bltbuf[0]
|| s->cirrus_srcptr_end != &s->cirrus_bltbuf[0];
s->cirrus_srcptr = &s->cirrus_bltbuf[0];
s->cirrus_srcptr_end = &s->cirrus_bltbuf[0];
s->cirrus_srccounter = 0;
if (!need_update)
return;
cirrus_update_memory_access(s);
}