glxwindow.c
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| /* Sets the transparency of the toplevel window. | |
| * An alpha value of 1 draws the window opaque a value of 0 makes | |
| * it totally translucent. | |
| * If alpha is set to a value outside of [0..1] EINVAL is returned. */ | |
| staticintsettransparency_helper(Display*display, Windowwin, doublealpha) | |
| { | |
| interr ; | |
| if ( alpha<0 | |
| ||alpha>1) { | |
| LOG_DOUBLE(alpha) ; | |
| err=EINVAL ; | |
| goto ABBRUCH ; | |
| } | |
| uint32_tcardinal_alpha= (uint32_t) (alpha* (uint32_t)-1) ; | |
| if (cardinal_alpha== (uint32_t)-1) { | |
| XDeleteProperty( display, win, XInternAtom( display, "_NET_WM_WINDOW_OPACITY", 0)) ; | |
| } else { | |
| XChangeProperty( display, win, XInternAtom( display, "_NET_WM_WINDOW_OPACITY", 0), | |
| XA_CARDINAL, 32, PropModeReplace, (uint8_t*) &cardinal_alpha, 1) ; | |
| } | |
| return0 ; | |
| ABBRUCH: | |
| LOG_ABORT(err) ; | |
| returnerr ; | |
| } |