linux X11, how to create transparent and insensitive to events window, non-dependant of window manager - xlib

Question

Hi everyone! I've created such a window (thanks to X11/Xlib: Create "GlassPane"-Window), that is on always on top, semitransparent, and doesn't consume any events. It works fine on some distributions, for example, on ubuntu or debian (after proper set of composite manager). On some distro mouse events can't penetrate through my window (with GNOME WM), on others both mouse and keyboard events can't go through. I am still testing os dependance of my app. Could you give me any tips, why my program is os dependant, is it only wm problem? Is there other way to solve my task and create universal utility that works on all linux distro? Appreciate any help!
/* for corrent exit on termination */
#include <signal.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/extensions/shape.h>
#include <X11/extensions/Xfixes.h>
#include <stdio.h>
#include <string.h> // strncmp
#include <unistd.h> // usleep
// all required elements for drawing
struct TXLibConfig
{
Display *dpy;
Window w;
XSetWindowAttributes attr;
XGCValues gcv;
XVisualInfo vinfo;
GC gc;
XserverRegion region;
int winWidth, winHeight;
};
int must_quit = 0;
// Define the function to be called when ctrl-c (SIGINT) is sent to process
void signal_callback_handler(int signum) {
must_quit = 1;
}
int XInit(TXLibConfig *txlibPtr);
int main(int argc, char *argv[]) {
// exit by Ctrl+C and pkill
signal(SIGINT, signal_callback_handler);
signal(SIGTERM, signal_callback_handler);
TXLibConfig tXlibCfg = {0};
XInit(&tXlibCfg);
int ctr = 0;
while(1) {
XClearWindow(tXlibCfg.dpy,tXlibCfg.w);
XSetForeground(tXlibCfg.dpy, tXlibCfg.gc, 0x01808020);
XRectangle rct[] = {300, 300, 200, 200};
XFillRectangles(tXlibCfg.dpy, tXlibCfg.w, tXlibCfg.gc, rct, 1);
XSetForeground(tXlibCfg.dpy, tXlibCfg.gc, 0xf0010140);
XRectangle rectan[] = {350, 350, 10*(ctr % 10 + 1), 10*(ctr % 10 + 1)};
XFillRectangles(tXlibCfg.dpy, tXlibCfg.w, tXlibCfg.gc, rectan, 1);
XFlush(tXlibCfg.dpy);
XSync(tXlibCfg.dpy, True);
ctr++;
usleep(200000);
if (must_quit == 1) break;
}
XClearWindow(tXlibCfg.dpy,tXlibCfg.w);
XDestroyWindow(tXlibCfg.dpy, tXlibCfg.w);
XCloseDisplay(tXlibCfg.dpy);
return 0;
}
int XInit(TXLibConfig *txlibPtr)
{
txlibPtr->dpy = XOpenDisplay(NULL);
if (!txlibPtr->dpy) printf("cannot open display '%s'", XDisplayName(0));
// Get screen resolution >>>>>
int snum;
snum = DefaultScreen(txlibPtr->dpy);
txlibPtr->winWidth = DisplayWidth(txlibPtr->dpy, snum);
txlibPtr->winHeight = DisplayHeight(txlibPtr->dpy, snum);
// Get screen resolution <<<<<
XMatchVisualInfo(txlibPtr->dpy, DefaultScreen(txlibPtr->dpy), 32, TrueColor, &txlibPtr->vinfo);
txlibPtr->attr.colormap = XCreateColormap(txlibPtr->dpy, DefaultRootWindow(txlibPtr->dpy), txlibPtr->vinfo.visual, AllocNone);
txlibPtr->attr.border_pixel = 0;
txlibPtr->attr.background_pixel = 0;
txlibPtr->w = XCreateWindow(txlibPtr->dpy, DefaultRootWindow(txlibPtr->dpy), 0, 0,
txlibPtr->winWidth, txlibPtr->winHeight, 10, txlibPtr->vinfo.depth,
NoEventMask, txlibPtr->vinfo.visual, CWColormap | CWBorderPixel | CWBackPixel, &txlibPtr->attr);
// Ignore any input for passing events to other windows >>>>>
txlibPtr->region = XFixesCreateRegion (txlibPtr->dpy, NULL, 0);
XFixesSetWindowShapeRegion (txlibPtr->dpy, txlibPtr->w, ShapeBounding, 0, 0, 0);
XFixesSetWindowShapeRegion (txlibPtr->dpy, txlibPtr->w, ShapeInput, 0, 0, txlibPtr->region);
XFixesDestroyRegion (txlibPtr->dpy, txlibPtr->region);
// Ignore any input for passing events to other windows <<<<<
txlibPtr->gcv.line_width = 1;
txlibPtr->gc = XCreateGC(txlibPtr->dpy, txlibPtr->w, GCLineWidth, &txlibPtr->gcv);
XSelectInput(txlibPtr->dpy, txlibPtr->w, ExposureMask);
long value = XInternAtom(txlibPtr->dpy, "_NET_WM_WINDOW_TYPE_DOCK", False);
XChangeProperty(txlibPtr->dpy, txlibPtr->w, XInternAtom(txlibPtr->dpy, "_NET_WM_WINDOW_TYPE", False),
6, 32, PropModeReplace, (unsigned char *) &value, 1);
XMapWindow(txlibPtr->dpy, txlibPtr->w);
XFlush(txlibPtr->dpy);
usleep(100000);
return 0;
};