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#include <X11/Xlib.h>#include <Imlib2.h>#include <stdio.h>#include <string.h>int main(int argc, char **argv) {    Display *display;    XWindowAttributes windowattr;    Imlib_Image image;    Imlib_Image icon;    int windowid, thumbwidth, thumbheight;    char *imageformat, *imagepath;    char *iconformat, *iconpath;    int w, h;    if ( argc != 5 ) {        puts("Usage: thumb WindowId ThumbWidth ThumbFile IconFile");        return 1;    }    sscanf(argv[1], "%x", &windowid);    sscanf(argv[2], "%d", &thumbwidth);    imagepath = argv[3];    imageformat = strrchr(argv[3], '.');    iconpath = argv[4];    iconformat = strrchr(argv[4], '.');    if ( (display = XOpenDisplay(NULL)) == NULL ) return 1;    XGetWindowAttributes(display, windowid, &windowattr);    thumbheight = (int)((float)windowattr.height /        ((float)windowattr.width/(float)thumbwidth));    imlib_context_set_anti_alias(1);    imlib_context_set_display(display);    imlib_context_set_visual(DefaultVisual(display,        DefaultScreen(display)));    imlib_context_set_colormap(DefaultColormap(display,        DefaultScreen(display)));    imlib_context_set_drawable(windowid);    if (4*thumbwidth >= windowattr.width ||        4*thumbheight >= windowattr.height ) {        image = imlib_create_image_from_drawable((Pixmap)0, 0, 0,            windowattr.width, windowattr.height, 1);        imlib_context_set_image(image);        image = imlib_create_cropped_scaled_image(0, 0,            windowattr.width, windowattr.height,            thumbwidth, thumbheight);    } else {        image = imlib_create_scaled_image_from_drawable((Pixmap)0, 0, 0,            windowattr.width, windowattr.height,            4*thumbwidth, 4*thumbheight, 1, 1);        imlib_context_set_image(image);        image = imlib_create_cropped_scaled_image(0, 0,            4*thumbwidth, 4*thumbheight,            thumbwidth, thumbheight);    }    icon = imlib_load_image(argv[4]);    imlib_context_set_image(icon);    w = imlib_image_get_width();    h = imlib_image_get_height();    imlib_context_set_image(image);    imlib_blend_image_onto_image(   icon, 0,                                    0, 0, w, h,                                    0, 0, w, h);    imlib_image_set_format(imageformat + 1);    imlib_save_image(argv[3]);    fprintf(stdout, "WindowStyle IconOverride, Icon %s\n", argv[3]);    return 0;} #####https://help.ubuntu.com/community/InstallationXubuntuhttps://help.ubuntu.com/community/InstallingXubuntuhttp://ubuntuforums.org/showthread.php?t=101790