Question

我正在开发一个项目，该项目使用opencv来检测屏幕上的一些图像并获取它们的坐标。我在stackoverflow上找到了一个快速截取屏幕截图的功能，因此我可以非常快速地扫描屏幕。这是代码：

#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <cstdint>
#include <cstring>
#include <vector>
#include "/usr/local/include/opencv2/opencv.hpp"

using namespace cv;

//Function to take screenshots, this is the function that seems to be causing the HDD thrashing

void ImageFromDisplay(std::vector<uint8_t>& Pixels, int& Width, int& Height, int& BitsPerPixel)
{
    Display* display = XOpenDisplay(nullptr);
    Window root = DefaultRootWindow(display);

    XWindowAttributes attributes = {0};
    XGetWindowAttributes(display, root, &attributes);

    Width = attributes.width;
    Height = attributes.height;

    XImage* img = XGetImage(display, root, 0, 0 , Width, Height, AllPlanes, ZPixmap);
    BitsPerPixel = img->bits_per_pixel;
    Pixels.resize(Width * Height * 4);

    memcpy(&Pixels[0], img->data, Pixels.size());

    XFree(img);
    XCloseDisplay(display);
}

int main(){
    int Width = 0;
    int Height = 0;
    int Bpp = 0;
    std::vector<std::uint8_t> Pixels;

    while (1){
        //Func to take image (this is what is causing the thrashing)
        ImageFromDisplay(Pixels, Width, Height, Bpp);

        if (Width && Height){
            //Create a matrix
            Mat img = Mat(Height, Width, Bpp > 24 ? CV_8UC4 : CV_8UC3, &Pixels[0]);

            //Display matrix
            imshow("Display window", img);

            waitKey(1);
        }
    }
}

我没有使用X11的经验，所以我不知道如何解决这个问题。谁能告诉我究竟是什么导致了颠簸，我该如何解决？

c ++ HDD抖动原因

0 个答案: