Hello,
Our application needs to be able to take screenshots programmatically.
Historically, we used an xwd-like approach for this - basically, drawing
the entire windows hierarchy starting from the root window into a pixmap.
However, on modern systems with translucency effects enabled, the areas
occupied by translucent windows are painted black when we take a
screenshot using this method. This can easily be reproduced with the xwd
utility itself.
We tried to retrieve a handle to the overlay window provided by the
XComposite extension and use it instead of the root window for our
purposes. Basically we were doing the following (pseudo-code):
Window window = XRootWindow();
if (XComposite is available) {
window = XCompositeGetOverlayWindow();
}
xwd_like_procedure_for_window(window);
if (XComposite is available) {
XCompositeReleaseOverlayWindow(window);
}
This works fine as long as only one screenshot is taken during the app's
life-cycle. However, if we need to take several screenshots in a row,
for some reason subsequent images contain various visual artifacts
regardless of whether the translucency effects are enabled on the X
server or not.
Could anyone suggest the correct way to take a screenshot
programmatically when we know that translucent windows may be present on
the screen?
Please point me to a correct mailing list if this question doesn't
belong here. Any help is appreciated.
PS. Please keep me in the CC list as I'm not subscribed to this mailing
list.
--
best regards,
Anthony
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