c++ - 文本覆盖不适用于 Xorg 模式设置驱动程序

Question

这是一段显示文本和背景矩形的代码当这段代码Intel默认运行时，XORG driver一切正常，文本和矩形都被显示，而当我切换到Modesetting驱动程序时，只看到背景矩形而文本没有正在显示

#include <iostream>
#include<unistd.h>
#include <sstream>
#include <string>              
#include <X11/Xlib.h>            
#include <X11/Xutil.h>          
#include <X11/Xft/Xft.h> 
#include <X11/extensions/XShm.h>      
#include <sys/ipc.h> 
#include <sys/shm.h>
using namespace std;  
int main()
{
    Display *display = XOpenDisplay(NULL);
    Screen *scn = DefaultScreenOfDisplay(display);
    int screen_num = DefaultScreen(display);
    int screen_width = DisplayWidth(display, screen_num);
    int screen_height = DisplayHeight(display, screen_num);
    int defaultScnDepth = DefaultDepthOfScreen(scn);
    Visual *visual = DefaultVisualOfScreen(scn);
    Window window=XCreateSimpleWindow(display,RootWindow(display,screen_num), 50, 50, 400, 400, 2 ,BlackPixel(display,screen_num),WhitePixel(display,screen_num));
    //XFlush(display)
    XMapWindow(display, window);
    XShmSegmentInfo shmInfo;
    XImage *xImage;
    Pixmap backPixmap;
    (xImage) = XShmCreateImage(display, visual, defaultScnDepth, ZPixmap, NULL, &shmInfo, screen_width, screen_height);
    shmInfo.shmid = shmget(IPC_PRIVATE, (xImage)->bytes_per_line * (xImage)->height, IPC_CREAT | 0777);
    shmInfo.shmaddr = (char *) shmat(shmInfo.shmid, 0, 0);
    xImage->data = shmInfo.shmaddr;
    shmInfo.readOnly = False;
    XShmAttach(display, &shmInfo);
    (backPixmap) = XShmCreatePixmap(display, window, (char *) (shmInfo.shmaddr), &shmInfo, (xImage)->width, (xImage)->height, (xImage)->depth);
    XGCValues values;
    GC gc = XCreateGC(display, backPixmap, 0, &values);
    XSync(display, false);

    Drawable drawable =backPixmap;
    visual = DefaultVisual(display, DefaultScreen(display));
    Colormap colormap = XCreateColormap(display, window, visual, AllocNone);
    //gc = XCreateGC(display, drawable, 0, &values);
    //XFlushGC(display, gc);
    const char *text = "Hello";
    XftDraw *xftDraw = NULL;
    XRenderColor xrFGColor, xrBGColor;
    XftColor     xftFGColor, xftBGColor;
    XftFont *font = NULL;
    font = XftFontOpenName( display, DefaultScreen( display ), "morpheus-18" );  
    xftDraw = XftDrawCreate(display, drawable, visual, colormap);
    int nextLineStartY, rectYRef;
    bool firstIte;
    unsigned int rectX, rectY, rectWidth, rectHeight;

    nextLineStartY = 0; rectYRef = 0;
    firstIte = true;
    rectX = 0; rectY = 0; rectWidth = 0; rectHeight = 0;

    std::istringstream strStream(text);
    std::string line;

    while(std::getline(strStream, line))

    {

        const char *lineText = line.c_str();
        if(*lineText == '\0')
        {
            nextLineStartY += rectHeight + 1;
            continue;
        }

        const char *text = lineText;
        XGlyphInfo extents;
        XftTextExtents8(display, font, (XftChar8 *)text, strlen(text), &extents);
        unsigned int width = extents.width;
        unsigned int height = extents.height;
        int ascent = extents.y;
        int lBearing = extents.x;
        rectX = 50 - lBearing - 1;
        rectY = 50 - ascent - 1;
        rectWidth = width + 2 * 1;
        rectHeight = height + 5 + 1;
        if(firstIte)
        {
            rectYRef = rectY;
            firstIte = false;
        }
        int diff = rectYRef - rectY;
        rectY += nextLineStartY + diff;
        nextLineStartY += rectHeight + 1;
        if(1)
        {
            xrBGColor.red = 0x7fff;
            xrBGColor.green= 0x7fff;
            xrBGColor.blue = 0x7fff;
            xrBGColor.alpha= 0xffff;
            XftColorAllocValue(display, visual, colormap, &xrBGColor, &xftBGColor);
            //  Draw background fill rectangle
            XftDrawRect(xftDraw, &xftBGColor, rectX, rectY, rectWidth, rectHeight);
            XftColorFree(display, visual, colormap, &xftBGColor);
        }
        xrFGColor.red =  0xbfff;
        xrFGColor.green =  0xbfff;
        xrFGColor.blue =  0xbfff;
        xrFGColor.alpha= 0xffff;
        XftColorAllocValue(display, visual, colormap, &xrFGColor, &xftFGColor);
        //  Overlay Text
        XftDrawString8(xftDraw, &xftFGColor, font, 50, 50, (XftChar8 *) text, strlen(text));

        XColor xForeColor;
        xForeColor.red = 0xafff;
        xForeColor.green = 0xafff;
        xForeColor.blue = 0xffff;
        if(XAllocColor(display,colormap,&xForeColor))
            XSetForeground(display,gc,xForeColor.pixel);
        XftColorFree(display, visual, colormap, &xftFGColor);
        XFreeColors(display, colormap, &(xForeColor.pixel), 1, 0);
    }

    XftDrawDestroy(xftDraw);
    XShmPutImage(display, window, gc, xImage, 0, 0, 0, 0, 400, 400, false);
    XSync(display, false);
    getchar();

}

我也尝试了其他驱动程序，使用 radeon 驱动程序时，我看到一个 X 错误，即不支持共享像素图，而我没有看到模式设置驱动程序的任何此类错误。这与共享像素图有关，如果是，我应该如何使其与模式设置驱动程序一起使用。我已经坚持了一段时间了，任何帮助将不胜感激。