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author | Uli Schlachter <psychon@users.noreply.github.com> | 2021-05-20 21:37:35 +0200 |
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committer | GitHub <noreply@github.com> | 2021-05-20 21:37:35 +0200 |
commit | 60542da0916a62a6daede9293090660b05d4679e (patch) | |
tree | a58f2606fd5dbed934a4b0c6cbf2ee69cd9df199 /include | |
parent | fcae64f7fd97c02f36200a4c60ab7ec2fd4410df (diff) | |
download | i3-60542da0916a62a6daede9293090660b05d4679e.tar.gz i3-60542da0916a62a6daede9293090660b05d4679e.zip |
Do not "set" the wallpaper during startup (#4373)
"Set" the wallpaper during startup only sometimes
Since commit 4f5e0e7, i3 would take a screenshot and set that as the
background pixmap of the root window during startup. This is the easy
part of setting a proper X11 wallpaper.
The code in question was added because something either set the
background pixmap of the root window to NONE or the X11 server was
started with "-background none". This is apparently done by default by
e.g. gdm to avoid some flickering while the X11 server starts up.
This commit makes this code conditional: Only when no wallpaper is
detected is a screenshot taken.
Since I could not find any way to query the background of a window, a
more direct approach is taken to detect this situation: First, we find
some part of the root window that is not currently covered. Then we open
a white window there, close it again and grab a screenshot. If a
wallpaper is set, the X11 server will draw this wallpaper after the
window is closed and something else will be visible in the screenshot.
However, the wallpaper could have a white pixel at the tested position.
Thus, this procedure is repeated with a black window.
Only when this procedure produces two different pixel values is a
screenshot taken and set as the wallpaper.
Fixes: https://github.com/i3/i3/issues/4371
Fixes: https://github.com/i3/i3/issues/2869
Signed-off-by: Uli Schlachter <psychon@znc.in>
Diffstat (limited to 'include')
-rw-r--r-- | include/libi3.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/libi3.h b/include/libi3.h index 15f63704..a93b3ff9 100644 --- a/include/libi3.h +++ b/include/libi3.h @@ -655,3 +655,16 @@ int create_socket(const char *filename, char **out_socketpath); * */ bool path_exists(const char *path); + +/** + * Grab a screenshot of the screen's root window and set it as the wallpaper. + */ +void set_screenshot_as_wallpaper(xcb_connection_t *conn, xcb_screen_t *screen); + +/** + * Test whether the screen's root window has a background set. + * + * This opens & closes a window and test whether the root window still shows the + * content of the window. + */ +bool is_background_set(xcb_connection_t *conn, xcb_screen_t *screen); |