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sm501: Ignore no-op blits 

Some guests seem to try source copy blits with same source and dest
which are no-op so avoid calling pixman for these.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: a2a8214dd37344dfb65f1c343ace4cff2e94f3bb.1592686588.git.balaton@eik.bme.hu
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
BALATON Zoltan 2020-06-20 22:56:28 +02:00 committed by Gerd Hoffmann
parent 4decaad9d2
commit 1cb62e3666
1 changed files with 5 additions and 0 deletions
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5
hw/display/sm501.c
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@ -788,6 +788,11 @@ static void sm501_2d_operation(SM501State *s)
(rop2_source_is_pattern ?
" with pattern source" : ""));
}
/* Ignore no-op blits, some guests seem to do this */
if (src_base == dst_base && src_pitch == dst_pitch &&
src_x == dst_x && src_y == dst_y) {
break;
}
/* Check for overlaps, this could be made more exact */
uint32_t sb, se, db, de;
sb = src_base + src_x + src_y * (width + src_pitch);