基于粤嵌LinuxGEC6818开发板实现电子相册的c语言程序

好的，以下是一个基于粤嵌LinuxGEC6818开发板实现电子相册的C语言程序的简单示例：

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <linux/fb.h>
#include <sys/mman.h>

int main()
{
    // 打开并映射framebuffer设备文件
    int fbfd = open("/dev/fb0", O_RDWR);
    if (fbfd == -1) {
        printf("Error: cannot open framebuffer device.\n");
        exit(1);
    }
    struct fb_var_screeninfo vinfo;
    struct fb_fix_screeninfo finfo;
    if (ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo) == -1) {
        printf("Error: reading fixed information.\n");
        exit(2);
    }
    if (ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo) == -1) {
        printf("Error: reading variable information.\n");
        exit(3);
    }
    int screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;
    char *fbp = (char *)mmap(0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED, fbfd, 0);
    if ((int)fbp == -1) {
        printf("Error: failed to mmap framebuffer device to memory.\n");
        exit(4);
    }

    // 读取图片并绘制到framebuffer上
    int imgfd = open("test.jpg", O_RDONLY);
    if (imgfd == -1) {
        printf("Error: cannot open image file.\n");
        exit(5);
    }
    char *imgp = (char *)malloc(screensize);
    if (read(imgfd, imgp, screensize) == -1) {
        printf("Error: failed to read image file.\n");
        exit(6);
    }
    for (int y = 0; y < vinfo.yres; y++) {
        for (int x = 0; x < vinfo.xres; x++) {
            int location = (x + vinfo.xoffset) * (vinfo.bits_per_pixel / 8) +
                           (y + vinfo.yoffset) * finfo.line_length;
            *(fbp + location) = *(imgp + location);
            *(fbp + location + 1) = *(imgp + location + 1);
            *(fbp + location + 2) = *(imgp + location + 2);
            *(fbp + location + 3) = *(imgp + location + 3);
        }
    }

    // 关闭文件描述符和解除内存映射
    close(imgfd);
    munmap(fbp, screensize);
    close(fbfd);

    return 0;
}

这个程序实现了打开并映射framebuffer设备文件，读取图片并绘制到framebuffer上的功能。您可以根据需要对程序进行修改和扩展，实现更完整的电子相册功能。