ssss/user_proc.c

#include <stdint.h>
#include "user_proc.h"
//绘制十字交叉线
void draw_cross(GrayImage *img, int x, int y, int size, uint8_t color){
    if(!img || !img->data) return;
    //获取图像宽度和高度
    int w = img->width;
    int h = img->height;
    if(x<0 || x>=w || y<0 || y>=h) return;
    //定义一个二维数组指针方便访问像素 
    uint8_t **image = img->rows;
    for(int dx=-size;dx<=size;dx++){
        int nx = x + dx;
        if(nx>=0 && nx<w){
            image[y][nx] = color;
        }
    }
    for(int dy=-size;dy<=size;dy++){
        int ny = y + dy;
        if(ny>=0 && ny<h){
            image[ny][x] = color;
        }
    }
}
void img_proc(GrayImage *img){
    draw_cross(img, img->width/2, img->height/2, 20, 0);
}