c++ - 我想做闪屏，现在有两个问题？

Question

1: 我想要一个启动画面，但我只有一个窗口？那么，如何处理像 parm 这样的东西

2:我已经用了一段时间(!done)来绘制窗口，那么如何使用函数或其他东西来突破

这是我的代码，非常感谢你

g++ -o m_splash m_splash.cpp -lX11 -lImlib2

#include <stdio.h>
#include <X11/Xlib.h>
#include <Imlib2.h>
#include <unistd.h>

int main()
{
    Imlib_Image  m_img;
    Display     *m_dpy;
    Pixmap       m_pix;
    Window       m_root;
    Screen      *scn;
    int m_width, m_height;
    const char *filename = "/home/ang/so_zt/w.png";

    m_img = imlib_load_image(filename);
    if(!m_img)
    {
        printf("%s\n","init m_img faild");
    }
    imlib_context_set_image(m_img);
    m_width = imlib_image_get_width();
    m_height = imlib_image_get_height();

    m_dpy = XOpenDisplay(NULL);
    if(!m_dpy)
    {
        printf("%s\n","open display failed");
    }
    scn = DefaultScreenOfDisplay(m_dpy);
    int s = DefaultScreen(m_dpy);
    m_root = XCreateSimpleWindow(m_dpy, RootWindow(m_dpy,s),10,10,m_width,m_height,0,
                                 BlackPixel(m_dpy, s), WhitePixel(m_dpy, s));
    m_pix = XCreatePixmap(m_dpy, m_root, m_width, m_height, DefaultDepthOfScreen(scn));

    imlib_context_set_display(m_dpy);
    imlib_context_set_visual(DefaultVisualOfScreen(scn));
    imlib_context_set_colormap(DefaultColormapOfScreen(scn));
    imlib_context_set_drawable(m_pix);

    imlib_render_image_on_drawable(0,0);
    XSetWindowBackgroundPixmap(m_dpy, m_root, m_pix);
    XClearWindow(m_dpy, m_root);
    Atom wmDeleteMessage = XInternAtom(m_dpy, "WM_DELETE_WINDOW", False);
    XSetWMProtocols(m_dpy, m_root, &wmDeleteMessage, 1);

    XSelectInput(m_dpy, m_root, ExposureMask | KeyPressMask | StructureNotifyMask);
    XMapWindow(m_dpy, m_root);
    bool done = false;
    while (!done)
    {
        XEvent m_ev;
        XNextEvent(m_dpy, &m_ev);
        /* draw or redraw the window */
        if (m_ev.type == Expose)
        {
            XFillRectangle(m_dpy, m_root, DefaultGC(m_dpy, DefaultScreen(m_dpy)), 20, 20, 10, 10);
        }

    /* exit on key press */
        //usleep(1000000);
        //done = true;
        switch(m_ev.type)
        {
        case KeyPress:
            XDestroyWindow(m_dpy, m_root);
        break;

        case DestroyNotify:
            done = true;
        break;
        case ClientMessage:
            if (m_ev.xclient.data.l[0] == wmDeleteMessage)
            {
                done = true;
            }
        break;
        }
    }

    //XFreePixmap(m_dpy, m_pix);
    //imlib_free_image();
    //XCloseDisplay(m_dpy);
}

Answer 1

要使其成为启动屏幕，请使用扩展窗口管理器提示。

#include <X11/Xatom.h>

Atom type = XInternAtom(m_dpy, "_NET_WM_WINDOW_TYPE", False);
Atom value = XInternAtom(m_dpy, "_NET_WM_WINDOW_TYPE_SPLASH", False);
XChangeProperty(m_dpy, m_root, type, XA_ATOM, 32, PropModeReplace, reinterpret_cast<unsigned char*>(&value), 1);

然后，窗口将不带装饰地显示并一直保持到单击为止。

单击时，您会收到一个 UnmapNotify 事件，因此您应该使用它来设置完成。

为了避免获取事件，请添加

XFlush(m_dpy);

映射窗口以显示它之后

XUnmapWindow(m_dpy, m_root);

当你想摆脱它时。

在此示例中，程序在继续之前仅休眠 5 秒:

#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <Imlib2.h>
#include <unistd.h>

int main()
{
    Imlib_Image  m_img;
    Display     *m_dpy;
    Pixmap       m_pix;
    Window       m_root;
    Screen      *scn;
    int m_width, m_height;
    const char *filename = "w.png";

    m_img = imlib_load_image(filename);
    if(!m_img)
    {
        printf("%s\n","init m_img faild");
    }
    imlib_context_set_image(m_img);
    m_width = imlib_image_get_width();
    m_height = imlib_image_get_height();

    m_dpy = XOpenDisplay(NULL);
    if(!m_dpy)
    {
        printf("%s\n","open display failed");
    }
    scn = DefaultScreenOfDisplay(m_dpy);
    int s = DefaultScreen(m_dpy);
    m_root = XCreateSimpleWindow(m_dpy, RootWindow(m_dpy,s),10,10,m_width,m_height,0,
                                 BlackPixel(m_dpy, s), WhitePixel(m_dpy, s));
    m_pix = XCreatePixmap(m_dpy, m_root, m_width, m_height, DefaultDepthOfScreen(scn));

    Atom type = XInternAtom(m_dpy, "_NET_WM_WINDOW_TYPE", False);
    Atom value = XInternAtom(m_dpy, "_NET_WM_WINDOW_TYPE_SPLASH", False);
    XChangeProperty(m_dpy, m_root, type, XA_ATOM, 32, PropModeReplace, reinterpret_cast<unsigned char*>(&value), 1);

    imlib_context_set_display(m_dpy);
    imlib_context_set_visual(DefaultVisualOfScreen(scn));
    imlib_context_set_colormap(DefaultColormapOfScreen(scn));
    imlib_context_set_drawable(m_pix);

    imlib_render_image_on_drawable(0,0);
    XSetWindowBackgroundPixmap(m_dpy, m_root, m_pix);
    XClearWindow(m_dpy, m_root);
    Atom wmDeleteMessage = XInternAtom(m_dpy, "WM_DELETE_WINDOW", False);
    XSetWMProtocols(m_dpy, m_root, &wmDeleteMessage, 1);

    XMapWindow(m_dpy, m_root);
    XFlush(m_dpy);
    sleep(5);
    XUnmapWindow(m_dpy, m_root);
}