안녕하세요~

아래 프로그램은 kelp의 holelee 님의 프레임 버퍼 강좌입니다.

저의 환경에 맞게 LCD에 24Bit컬러로 사용할려고 하는데...

아래에 16으로 된 부분만 24로 바꾸었는데 에러가 발생합니다.

리눅스 상에서 프로임 버퍼로 쓸려고 하는데 어떤부분이 잘못된 건지요?

고수님들의 조언을 부탁드립니다.

/*
* fbbmp.c : bmp drawing on frame buffer example
*
* Copyright(C) 2002 holelee
*
*/

#include <stdio.h>
#include <stdlib.h> /* for exit */
#include <unistd.h> /* for open/close .. */
#include <fcntl.h>  /* for O_RDONLY */
#include <sys/ioctl.h> /* for ioctl */
#include <sys/mman.h> /* for mmap */
#include <linux/fb.h>  /* for fb_var_screeninfo, FBIOGET_VSCREENINFO */
#include "bmplib.h"

#define MIN(x, y) ((x) > (y) ? (y) : (x))

#define FBDEVFILE "/dev/fb"

typedef unsigned char ubyte;

static unsigned short makepixel(struct fb_var_screeninfo *pfbvar, ubyte r, ubyte g, ubyte b)
{
        unsigned short rnew, gnew, bnew;

        rnew = r >> (8-pfbvar->red.length);
        gnew = g >> (8-pfbvar->green.length);
        bnew = b >> (8-pfbvar->blue.length);

        return (unsigned short) ((rnew << pfbvar->red.offset)
                        | (gnew << pfbvar->green.offset)
                        | (bnew << pfbvar->blue.offset));
}

int main(int argc, char *argv[])
{
        int fbfd;
        unsigned short *pfbmap;
        struct fb_var_screeninfo fbvar;
        int i, j;
        struct bgrpixel pixel;
        bmphandle_t bh;

        if(argc != 2)
        {
                fprintf(stderr, "Usage:%s bmpfilen", argv[0]);
                exit(1);
        }

        bh = bmp_open(argv[1]);
        if(bh == NULL)
        {
                fprintf(stderr, "Cannot open bmp file(%s)n", argv[1]);
                fprintf(stderr, "File may be not bmp. Or file may be not supported by this programn");
                exit(0);
        }

        fbfd = open(FBDEVFILE, O_RDWR);
        if(fbfd < 0)
        {
                perror("fbdev open");
                exit(1);
        }

        if(ioctl(fbfd, FBIOGET_VSCREENINFO, &fbvar) < 0)
        {
                perror("fbdev ioctl");
                exit(1);
        }

        if(fbvar.bits_per_pixel != 16)
        {
                fprintf(stderr, "bpp is not 16n");
                exit(1);
        }

        pfbmap = (unsigned short *)
                mmap(0, fbvar.xres*fbvar.yres*24/8,
                        PROT_READ|PROT_WRITE, MAP_SHARED, fbfd, 0);

        if((unsigned)pfbmap == (unsigned)-1)
        {
                perror("fbdev mmap");
                exit(1);
        }

        /* main loop */
        for(i = 0; i < MIN(bmp_height(bh), fbvar.yres); i++)
        {
                for(j = 0; j < MIN(bmp_width(bh), fbvar.xres); j++)
                {
                        pixel = bmp_getpixel(bh, j, i);
                        *(pfbmap+i*fbvar.xres+j) = makepixel(&fbvar, pixel.r, pixel.g, pixel.b);
                }
        }

        /* clean up */
        bmp_close(bh);
        munmap(pfbmap, fbvar.xres*fbvar.yres*24/8);
        close(fbfd);
        exit(0);
        return 0;
}