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composite: Skip copying parent pixmap contents when possible

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If the parent window has a different depth (which means pWin can't have
valid contents yet) and pWin has effective background other than None.

Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/2092>
This commit is contained in:
Michel Dänzer
2025-10-30 16:45:23 +01:00
committed by Enrico Weigelt, metux IT consult
parent 55ee68f13b
commit 2767da13b6
1 changed files with 10 additions and 1 deletions
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11
composite/compalloc.c
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@@ -529,6 +529,15 @@ compUnredirectOneSubwindow(WindowPtr pParent, WindowPtr pWin)
return Success;
}
static unsigned
compGetBackgroundState(WindowPtr pWin)
{
while (pWin->backgroundState == ParentRelative)
pWin = pWin->parent;
return pWin->backgroundState;
}
static PixmapPtr
compNewPixmap(WindowPtr pWin, int x, int y, int w, int h)
{
@@ -563,7 +572,7 @@ compNewPixmap(WindowPtr pWin, int x, int y, int w, int h)
FreeScratchGC(pGC);
}
}
else {
else if (compGetBackgroundState(pWin) == None) {
PictFormatPtr pSrcFormat = PictureWindowFormat(pParent);
PictFormatPtr pDstFormat = PictureWindowFormat(pWin);
XID inferiors = IncludeInferiors;