diff options
| -rw-r--r-- | README.md | 2 | ||||
| -rw-r--r-- | xcross.c | 40 |
2 files changed, 20 insertions, 22 deletions
@@ -1,5 +1,5 @@ build and install -``` +```sh make sudo make install ``` @@ -8,25 +8,23 @@ int main (void) { // useless trash vars - int int_tmp; - unsigned int uint_tmp; + int int_tmp; + unsigned int uint_tmp; Window window_tmp; - int rootx=0, rooty=0; - + int rootx, rooty; Display * disp = XOpenDisplay(NULL); - Screen * scr = ScreenOfDisplay(disp, DefaultScreen(disp)); - Window root = RootWindow(disp, XScreenNumberOfScreen(scr)); - - XGCValues gcval; - gcval.foreground = XWhitePixel(disp, 0); - gcval.function = GXxor; - gcval.background = XBlackPixel(disp, 0); - gcval.plane_mask = gcval.background ^ gcval.foreground; - gcval.subwindow_mode = IncludeInferiors; - GC gc = XCreateGC(disp, root, - GCFunction|GCForeground|GCBackground|GCSubwindowMode, - &gcval); + Screen * scr = ScreenOfDisplay(disp, DefaultScreen(disp)); + Window root = RootWindow(disp, XScreenNumberOfScreen(scr)); + + // not completely understood + XGCValues gcval; + gcval.foreground = XWhitePixel(disp, 0); + gcval.function = GXxor; + gcval.background = XBlackPixel(disp, 0); + gcval.plane_mask = gcval.background ^ gcval.foreground; + gcval.subwindow_mode = IncludeInferiors; + GC gc = XCreateGC(disp, root, GCFunction|GCForeground|GCBackground|GCSubwindowMode, &gcval); XQueryPointer(disp, root, &window_tmp, &window_tmp, &rootx, &rooty, &int_tmp, &int_tmp, &uint_tmp); //printf("pointer coordinates x: %d, y: %d\n", rootx, rooty); @@ -34,13 +32,13 @@ int main (void) XDrawLine(disp, root, gc, rootx, 0, rootx, scr->height); XDrawLine(disp, root, gc, 0, rooty, scr->width, rooty); - // not sure if useful - //XFlush(disp); - //XFreeGC(disp, gc); - //XSync(disp, True); + // not completely understood + XFlush(disp); + XFreeGC(disp, gc); + XSync(disp, True); // man XCloseDisplay says: "Before exiting, you should call XCloseDisplay explicitly so that any pending errors are reported as XCloseDisplay performs a final XSync operation." - XCloseDisplay(disp); + XCloseDisplay(disp); return 0; } |