showjpg.c

SMDK2410开发板LINUX下的JPEG图片显示程序。

#include <stdio.h>
#include <fcntl.h>

int
main (void)
{
  int fp;
  int x;
  int width, height;
  unsigned char *image;
  char buf = 0x00;

  fp = open ("/dev/fb/0", O_RDWR);
  if (fp < 0)
    {
      printf ("Error : Can not open framebuffer device\n");
      exit (1);
    }

  read_jpeg("pic.jpg", &width, &height, &image);
  if ((width != 240) || (height != 320)) {
	printf("Error: not a 240*320 picture\n");
	exit(1);
  }

  for (x = 0; x < 240 * 320 * 3; x+=3)
    {
      write (fp, &image[x+2], 1);
      write (fp, &image[x+1], 1);
      write (fp, &image[x], 1);
      write (fp, &buf, 1);
    }
  close (fp);
}