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composite: Only copy bits from the parent pixmap when absolutely necessary

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Since 1e728c3e88 ,
Whenever we allocate a composite pixmap, we perform an expensive CopyArea call from the parent pixmap.

This leads to very bad performance when using a framebuffer driver without shadowfb.

My guess is that this call ends up reading memory from the framebuffer memory directly, which is very slow.

Fixes: https://gitlab.freedesktop.org/xorg/xserver/-/issues/1814

Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
Signed-off-by: stefan11111 <stefan11111@shitposting.expert>
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/2073>
(cherry picked from commit 7e6c55cc9f)
This commit is contained in:
stefan11111
2025-10-05 17:02:51 +03:00
committed by Alan Coopersmith
parent 9d6e68b45f
commit 1708f0f6ae
1 changed files with 3 additions and 0 deletions
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3
composite/compalloc.c
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@@ -544,6 +544,9 @@ compNewPixmap(WindowPtr pWin, int x, int y, int w, int h)
pPixmap->screen_x = x;
pPixmap->screen_y = y;
if (pWin->backgroundState != None)
return pPixmap;
if (pParent->drawable.depth == pWin->drawable.depth) {
GCPtr pGC = GetScratchGC(pWin->drawable.depth, pScreen);