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Prevent some NoExpose events from being generated

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* src/xterm.c (x_scroll_run): Use the rendering extension if
available to avoid NoExpose events.
This commit is contained in:
Po Lu 2022-03-05 10:05:14 +08:00
parent 6efed75ff3
commit 76d79e1576
1 changed files with 18 additions and 6 deletions
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24
src/xterm.c
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@ -6037,12 +6037,24 @@ x_scroll_run (struct window *w, struct run *run)
}
else
#endif /* USE_CAIRO */
XCopyArea (FRAME_X_DISPLAY (f),
FRAME_X_DRAWABLE (f), FRAME_X_DRAWABLE (f),
f->output_data.x->normal_gc,
x, from_y,
width, height,
x, to_y);
{
#ifdef HAVE_XRENDER
/* Avoid useless NoExpose events. This way, we only get regular
exposure events when there is actually something to
expose. */
if (FRAME_X_PICTURE (f) != None)
XRenderComposite (FRAME_X_DISPLAY (f), PictOpSrc, FRAME_X_PICTURE (f),
None, FRAME_X_PICTURE (f), x, from_y, 0, 0, x, to_y,
width, height);
else
#endif
XCopyArea (FRAME_X_DISPLAY (f),
FRAME_X_DRAWABLE (f), FRAME_X_DRAWABLE (f),
f->output_data.x->normal_gc,
x, from_y,
width, height,
x, to_y);
}
unblock_input ();
}