g2d 进行缩放没有权限怎么回事？

[hy123456]

static int g2d_scale_framebuf(int src_width, int src_height, int dst_width, int dst_height)
{
	
 // 获取帧缓冲长度
    int fb_size =  dst_width * dst_height * 4;
	//int fb_fd = fbfd;
    // 映射帧缓冲到内存
    //void* fb_ptr = mmap(NULL, fb_size, PROT_READ | PROT_WRITE, MAP_SHARED, fb_fd, 0);
    //if (fb_ptr == MAP_FAILED) {
    //    perror("Failed to mmap frame buffer");
    //    //close(fb_fd);
    //    return -1;
    //}


    void * fb_ptr = malloc(fb_size);
    if(fb_ptr == NULL) {
        perror("Failed to allocate memory 1111 for scaled image");
        return -1;
    }


   // 分配目标空间内存
    int dst_size = src_width * src_height * 4;
    void* dst_ptr = malloc(dst_size);
    if (dst_ptr == NULL) {
        perror("Failed to allocate memory for scaled image");
        //munmap(fb_ptr, fb_size);
        //close(fb_fd);
        return -1;
    }

//	memcpy(dst_ptr, fb_ptr, fb_size);
	memset(dst_ptr, 0x55, dst_size);

    // 打开 G2D 设备
    int g2d_fd = open("/dev/g2d", O_RDWR);
    if (g2d_fd < 0) {
        perror("Failed to open G2D device");
        munmap(fb_ptr, fb_size);
        //close(fb_fd);
        return -1;
    }

	g2d_stretchblt str;
    g2d_image image_front, scn;
    g2d_rect src_rect, dst_rect;

    /* 设置源图像参数 */
    image_front.addr[0] = dst_ptr;
    image_front.w = src_width;
    image_front.h = src_height;
    image_front.format = G2D_FMT_RGBX8888;
    image_front.pixel_seq = G2D_SEQ_NORMAL;
    image_front.addr[1] = dst_ptr + image_front.w *image_front.h;
    /* 设置目标图像参数 */
    scn.addr[0] = fb_ptr;
    scn.w = dst_width;
    scn.h = dst_height;
    scn.format = G2D_FMT_RGBX8888;
    scn.pixel_seq = G2D_SEQ_NORMAL;

    /* 设置源和目标矩形区域 */
    src_rect.x = 0;
    src_rect.y = 0;
    src_rect.w = src_width;
    src_rect.h = src_height;

    dst_rect.x = 0;
    dst_rect.y = 0;
    dst_rect.w = dst_width;
    dst_rect.h = dst_height;

    /* 设置缩放参数 */
    str.flag = 0;
    str.color = 0xffffffff;
    str.alpha = 0xff;

    /* 设置源图像和矩形区域 */
    str.src_image.addr[0] = image_front.addr[0];
	str.src_image.addr[1] = image_front.addr[1];
    str.src_image.w = image_front.w;
    str.src_image.h = image_front.h;
    str.src_image.format = image_front.format;
    str.src_image.pixel_seq = image_front.pixel_seq;
    str.src_rect = src_rect;

    /* 设置目标图像和矩形区域 */
    str.dst_image.addr[0] = scn.addr[0];
    str.dst_image.w = scn.w;
    str.dst_image.h = scn.h;
    str.dst_image.format = scn.format;
    str.dst_image.pixel_seq = scn.pixel_seq;
    str.dst_rect = dst_rect;

    // 执行 G2D 缩放操作
    if (ioctl(g2d_fd, G2D_CMD_STRETCHBLT, &str) < 0) {
        perror("G2D_CMD_STRETCHBLT failed....");
       // munmap(fb_ptr, fb_size);
        close(g2d_fd);
        //close(fb_fd);
        return -1;
    }

    // 释放目标空间内存
    free(dst_ptr);
	free(fb_ptr);
    // 解除帧缓冲内存映射
   // munmap(fb_ptr, fb_size);

    // 关闭 G2D 设备
   close(g2d_fd);
	return 0;
}




int main() {
    const char *image_path = "image.bmp";
    const char *framebuffer_path = "/dev/fb0";

    //write_to_framebuffer(image_path, framebuffer_path);
	g2d_scale_framebuf(1024,600,800,480);

    return 0;
}

写了个小程序测试一下用g2d进行缩放。执行的时候提示没有权限，问题出在那里了？
root@TinaLinux:~# /usr/bin/a.out
G2D_CMD_STRETCHBLT failed....: Operation not permitted