Ubuntu读取桌面某个点的像素

最新推荐文章于 2023-02-07 09:20:13 发布

Helminthauge

最新推荐文章于 2023-02-07 09:20:13 发布

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文章标签： X11 screenshot C++

本文链接：https://blog.youkuaiyun.com/Helminthauge/article/details/80428503

版权

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

unsigned long readPixel(int x, int y) {
    Display *display = XOpenDisplay(NULL);
    Window root = DefaultRootWindow(display);
    //if screen resolution is unknown
    //XWindowAttributes gwa;
    //XGetWindowAttributes(display, root, &gwa);
    //width = gwa.width, height = gwa.height
    XImage *image = XGetImage(display, root, 0, 0, 1920, 1080, AllPlanes, ZPixmap);
    unsigned long RGB = XGetPixel(image, x, y);
    // R = (RGB >> 16)
    // G = (RGB >> 8 & 255)
    // B = (RGB & 255)
    // all unsigned long
    XCloseDisplay(display);
    return RGB;
}

//compile with g++ $file -l X11