嵌入式系统平台,读取framebuffer保存为png图片

最新推荐文章于 2022-11-13 23:05:17 发布

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最新推荐文章于 2022-11-13 23:05:17 发布 · 1.4k 阅读

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CC 4.0 BY-SA版权

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <getopt.h>
#include <sys/vt.h>
#include <png.h>
#include <zlib.h>
#include <linux/fb.h>

static int Blue = 0;
static int Green = 1;
static int Red = 2;
static int Alpha = 3;

int main(int argc, char**argv)
{
	struct fb_var_screeninfo fb_varinfo;
	int fd;		
	int bitdepth, height, width;
	size_t buf_size;
	size_t buf_size1;
	unsigned char *inbuffer;
	unsigned char *outbuffer;

	/*fb_fix_screeninfo信息的设置*/
	memset(&fb_varinfo, 0, sizeof(struct fb_var_screeninfo));

	/*打开fb0设备节点*/
	fd = open("/dev/fb0",O_RDWR);
	if( fd == -1)
	{
		printf("open dev fb0 error\n");	
		return -1;
	}

	ioctl(fd,FBIOGET_VSCREENINFO, &fb_varinfo);
	printf("xres = %u yres = %u\n",fb_varinfo.xres,fb_varinfo.yres);

	bitdepth = (int)fb_varinfo.bits_per_pixel;
	width = (int)fb_varinfo.xres;
	height = (i