/********************************************************************************
 *                      I.MX6 android 获取framebuffer信息
 * 声明：
 *     调试显示屏的时候，我们可能会需要去知道我们设置的信息是否正确，或者有时候
 * 需要去确认别人的设置的是否正确。
 *
 *                                           2016-1-20 深圳 南山平山村 曾剑锋
 *******************************************************************************/

参考文章：
    【Linux】FrameBuffer操作入门
        http://blog.csdn.net/tianshuai1111/article/details/8502613

一、cat fbinfo.c
    #include <unistd.h>  
    #include <stdio.h>  
    #include <fcntl.h>  
    #include <linux/fb.h>  
    #include <sys/mman.h>  
    #include <stdlib.h>  
      
    // I.MX6 android fb0 ----> "/dev/graphics/fb0"
    int main (int argc, char **argv)   
    {  
        int fp = 0;  
        struct fb_var_screeninfo vinfo;  
        struct fb_fix_screeninfo finfo;  
        fp = open (argv[1], O_RDWR);  
        if (fp < 0){  
            printf("Error : Can not open framebuffer device\n");  
            exit(1);  
        }  
      
        if (ioctl(fp,FBIOGET_FSCREENINFO,&finfo)){  
            printf("Error reading fixed information\n");  
            exit(2);  
        }  
          
        if (ioctl(fp,FBIOGET_VSCREENINFO,&vinfo)){  
            printf("Error reading variable information\n");  
            exit(3);  
        }  
      
        printf("The mem is :%d\n",finfo.smem_len);  
        printf("The line_length is :%d\n",finfo.line_length);  
        printf("The xres is :%d\n",vinfo.xres);  
        printf("The yres is :%d\n",vinfo.yres);  
        printf("bits_per_pixel is :%d\n",vinfo.bits_per_pixel);  
        close (fp);  
    }  

二、Android.mk
    LOCAL_PATH := $(call my-dir)
    
    include $(CLEAR_VARS)
    LOCAL_MODULE    := fbinfo 
    LOCAL_SRC_FILES := fbinfo.c
    
    include $(BUILD_EXECUTABLE)