为什么我设置的xlib窗口背景透明的失败？ [英] Why I set xlib window background transparent failed？

问题描述

我用下面的code得到一个透明的窗口，但它返回black.What是我错了？而且，有谁能够给我一个简单的例子来创建具有透明背景的窗口？谢谢！

 的#include＆LT; X11 / Xlib.h＆GT;
＃包括LT＆; X11 / Xutil.h＆GT;INT主（INT ARGC，CHAR *的argv []）
{
    显示*显示= XOpenDisplay（NULL）;    XVisualInfo vinfo;
    XMatchVisualInfo（显示，DefaultScreen（显示器），32，真彩色，＆安培; vinfo）;    XSetWindowAttributes ATTR;
    attr.colormap = XCreateColormap（显示器，DefaultRootWindow（显示器），vinfo.visual，AllocNone）;
    attr.border_pixel = 0;
    attr.background_pixel = 0;    窗口赢= XCreateWindow（显示，DefaultRootWindow（显示器），0，0，300，200，0，vinfo.depth，的inputOutput，vinfo.visual，CWColormap | CWBorderPixel | CWBackPixel，＆放大器; attr指示）;
    XSelectInput（显示器，赢，StructureNotifyMask）;
    GC GC = XCreateGC（显示器，赢，0，0）;    原子WM_DELETE_WINDOW = XInternAtom（显示，WM_DELETE_WINDOW，0）;
    XSetWMProtocols（显示器，赢了，＆安培; WM_DELETE_WINDOW，1）;    XMapWindow（显示器，赢）;    INT keep_running = 1;
    XEvent事件;    而（keep_running）{
        XNextEvent例行（显示器，功放及;事件）;        开关（event.type）{
            案例ClientMessage：
                如果（event.xclient.message_type == XInternAtom（显示，WM_PROTOCOLS，1）及及（原子）event.xclient.data.l [0] == XInternAtom（显示，WM_DELETE_WINDOW，1））
                    keep_running = 0;                打破;            默认：
                打破;
        }
    }    XDestroyWindow（显示器，赢）;
    XCloseDisplay（显示）;
    返回0;
}
 

解决方案

您code正常工作对我来说：

KDE

OPENBOX +使用xcompmgr：

最有可能你没有运行复合管理器。尝试启动使用xcompmgr 命令

另外，请检查 _NET_WM_CM_S0 选择所有者 - 它应该的点由复合经理创建的窗口。

 的#include＆LT; X11 / Xlib.h＆GT;
＃包括LT＆; X11 / Xutil.h＆GT;
＃包括LT＆;＆stdio.h中GT;INT主（INT ARGC，CHAR *的argv []）
{
    显示*显示= XOpenDisplay（NULL）;    原子cmAtom = XInternAtom（显示，_NET_WM_CM_S0，0）;
    窗口cmOwner = XGetSelectionOwner（显示器，cmAtom）;    的printf（综合管理器窗口：％I \\ N，cmOwner）;    XCloseDisplay（显示）;
    返回0;
}
 

更新：

尝试设置从遮蔽你的窗口否决重定向到prevent WM装饰品。

  attr.border_pixel = 0;
attr.background_pixel = 0;
attr.override_redirect = 1; / *加入这一行* /窗口赢= XCreateWindow（显示，DefaultRootWindow（显示器），0，0，300，200，0，
vinfo.depth，输入 - 输出，vinfo.visual，
CWColormap | CWBorderPixel | CWBackPixel | CWOverrideRedirect / *，这一次* /＆安培; attr指示）;
 

I use the following code to get a transparent window, but it returns black.What's wrong with me? And, can anybody give me a simple example to create a window with transparent background?THANKS!

#include <X11/Xlib.h>
#include <X11/Xutil.h>

int main(int argc, char* argv[])
{
    Display* display = XOpenDisplay(NULL);

    XVisualInfo vinfo;
    XMatchVisualInfo(display, DefaultScreen(display), 32, TrueColor, &vinfo);

    XSetWindowAttributes attr;
    attr.colormap = XCreateColormap(display, DefaultRootWindow(display), vinfo.visual, AllocNone);
    attr.border_pixel = 0;
    attr.background_pixel = 0;

    Window win = XCreateWindow(display, DefaultRootWindow(display), 0, 0, 300, 200, 0, vinfo.depth, InputOutput, vinfo.visual, CWColormap | CWBorderPixel | CWBackPixel, &attr);
    XSelectInput(display, win, StructureNotifyMask);
    GC gc = XCreateGC(display, win, 0, 0);

    Atom wm_delete_window = XInternAtom(display, "WM_DELETE_WINDOW", 0);
    XSetWMProtocols(display, win, &wm_delete_window, 1);

    XMapWindow(display, win);

    int keep_running = 1;
    XEvent event;

    while (keep_running) {
        XNextEvent(display, &event);

        switch(event.type) {
            case ClientMessage:
                if (event.xclient.message_type == XInternAtom(display, "WM_PROTOCOLS", 1) && (Atom)event.xclient.data.l[0] == XInternAtom(display, "WM_DELETE_WINDOW", 1))
                    keep_running = 0;

                break;

            default:
                break;
        }
    }

    XDestroyWindow(display, win);
    XCloseDisplay(display);
    return 0;
}

解决方案

Your code works fine for me:

kde:

openbox + xcompmgr:

Most likely you are not running composite manager. Try to start xcompmgr command

Also check _NET_WM_CM_S0 selection owner - it should point to a window created by composite manager.

#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <stdio.h>

int main(int argc, char* argv[])
{
    Display* display = XOpenDisplay(NULL);

    Atom cmAtom = XInternAtom(display, "_NET_WM_CM_S0", 0);
    Window cmOwner = XGetSelectionOwner(display, cmAtom);

    printf("Composite manager window: %i\n", cmOwner);

    XCloseDisplay(display);
    return 0;
}

Update:

Try to set override-redirect to prevent WM decorations from obscuring your window.

attr.border_pixel = 0;
attr.background_pixel = 0;
attr.override_redirect = 1; /* this line added */

Window win = XCreateWindow(display, DefaultRootWindow(display), 0, 0, 300, 200, 0, 
vinfo.depth, InputOutput, vinfo.visual, 
CWColormap | CWBorderPixel | CWBackPixel | CWOverrideRedirect /* and this one*/, &attr);

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