在 Linux 中独立于桌面环境或窗口管理器以编程方式更改墙纸

Question

Linux have got lots of desktop environments (GNOME, KDE, Xfce, Cinnamon...) and windowing systems (X11, Wayland, Mir...) and it seems that each one has got its own way to change the wallpaper. Are there some high-level libraries, especially in C++ (and Qt 5), which enables the developer to change programatically the wallpaper in Linux, regardless of the window management or the desktop management? I am looking for something like that:

#include <the_lib>
#include <cstdlib>

int main(int argc, char ** argv) {
    std::string theNewWallpaper = "path/to/my/wallpaper.jpg";
    // Or a file, an image, or something else representing the wallpaper.

    TheLib::changeWallpaper(theNewWallpaper);
    // or a more complicated piece of code which does the same.

    return EXIT_SUCCESS;
}

Answer 1

Try the solution of "Andrew Y" in the post : Changing wallpaper on Linux programmatically

He claims that his solution is not dependant of the higher layer toolkits, so it's should work for any linux desktop environments.

static void
SetBackgroundToBitmap(Pixmap bitmap, unsigned int width, unsigned int height)
{
    Pixmap pix;
    GC gc;
    XGCValues gc_init;

    gc_init.foreground = NameToPixel(fore_color, BlackPixel(dpy, screen));
    gc_init.background = NameToPixel(back_color, WhitePixel(dpy, screen));
    if (reverse) {
        unsigned long temp=gc_init.foreground;
        gc_init.foreground=gc_init.background;
        gc_init.background=temp;
    }
    gc = XCreateGC(dpy, root, GCForeground|GCBackground, &gc_init);
    pix = XCreatePixmap(dpy, root, width, height,
                        (unsigned int)DefaultDepth(dpy, screen));
    XCopyPlane(dpy, bitmap, pix, gc, 0, 0, width, height, 0, 0, (unsigned long)1);
    XSetWindowBackgroundPixmap(dpy, root, pix);
    XFreeGC(dpy, gc);
    XFreePixmap(dpy, bitmap);
    if (save_colors)
        save_pixmap = pix;
    else
        XFreePixmap(dpy, pix);
    XClearWindow(dpy, root);
    unsave_past = 1;
}