首先需要安装JPEG库（安装包：jpegsrc.v6b.tar）
下载地址：http://download.csdn.net/source/2637188
编译并安装Jpeg格式支持文件,
tar zvxf jpegsrc.v6b.tar.gz
./configure --enable-shared --enable-static
make
make install
//===================
编译jpeg时报错
/usr/bin/install -c -m 644 ./cjpeg.1
/usr/local/man/man1/cjpeg.1
/usr/bin/install: cannot create regular file
`/usr/local/man/man1/cjpeg.1': No such file or directory
缺少/usr/local/man目录及man1子目录，新建后重新编译。
shell> mkdir /usr/local/man
shell> mkdir /usr/local/man/man1
//=====================
代码显示：
/* * $Id: fv.c * $Desp: draw jpeg to framebuffer * $Author: Tower * $Date: Sat July 21 17:15:49 CST 2010 */ #include #include #include #include #include #include #include #include #include #include #define FB_DEV "/dev/fb0" struct color { unsigned char r; unsigned char g; unsigned char b; } __attribute__((packed)); struct fb_var_screeninfo var; struct fb_fix_screeninfo fix; struct pixel_t { unsigned char b; unsigned char g; unsigned char r; unsigned char a; }; /***************** function declaration ******************/ void usage(char *msg); int fb_open(char *fb_device); int fb_close(int fd); int fb_stat(int fd, int *width, int *height, int *depth); void *fb_mmap(int fd, unsigned int screensize); int fb_munmap(void *start, size_t length); /************ function implementation ********************/ int main(int argc, char *argv[]) { /* * declaration for jpeg decompression */ struct jpeg_decompress_struct cinfo; struct jpeg_error_mgr jerr; FILE *infile; unsigned char *buffer; int fbdev; int i,j; unsigned int w, h; unsigned short bpp; struct color p; void *data, *save; struct pixel_t **fbp; unsigned int fb_width; unsigned int fb_height; unsigned int fb_depth; unsigned int screensize; if (argc < 2) { fprintf(stderr, "Usage: .../n"); return -1; } /* * Ioctl the framebuff */ fbdev = open(FB_DEV, O_RDWR); if (fbdev == -1) { perror("open"); return -1; } ioctl(fbdev, FBIOGET_FSCREENINFO, &fix); ioctl(fbdev, FBIOGET_VSCREENINFO, &var); fb_stat(fbdev, &fb_width, &fb_height, &fb_depth); screensize = fb_width * fb_height; data = mmap(NULL, fix.smem_len, PROT_READ | PROT_WRITE, MAP_SHARED, fbdev, 0); save = malloc(fix.smem_len); memcpy(save, data, fix.smem_len); fbp = (struct pixel_t **)malloc(sizeof(struct pixel_t *) * var.yres); for (i = 0; i < var.yres; ++i) { fbp[i] = (struct pixel_t *)(save + i * var.xres * var.bits_per_pixel / 8); } /* * open input jpeg file */ if ((infile = fopen(argv[1], "rb")) == NULL) { fprintf(stderr, "open %s failed/n", argv[1]); exit(-1); } /* * init jpeg decompress object error handler */ cinfo.err = jpeg_std_error(&jerr); jpeg_create_decompress(&cinfo); /* * bind jpeg decompress object to infile */ jpeg_stdio_src(&cinfo, infile); /* * read jpeg header */ jpeg_read_header(&cinfo, TRUE); /* * decompress process. * note: after jpeg_start_decompress() is called * the dimension infomation will be known, * so allocate memory buffer for scanline immediately */ jpeg_start_decompress(&cinfo); if ((cinfo.output_width > fb_width) || (cinfo.output_height > fb_height)) { printf("too large JPEG file,cannot display/n"); return (-1); } /* printf("cinfo.output_width=%d/tcinfo.output_height=%d/tcinfo.output_components=%d/n",cinfo.output_width,cinfo.output_height,cinfo.output_components); printf("cinfo.output_scanline=%d/n",cinfo.output_scanline); */ /* * display the JPEG on 32bit/linux */ buffer = (unsigned char *) malloc(cinfo.output_width*cinfo.output_components); memset(buffer,0,cinfo.output_width*cinfo.output_components); w=cinfo.output_width; h=cinfo.output_height; // printf("w=%d,h=%d/n",w,h); for (i = 0; i < h; ++i) { unsigned char *tmpbuf=buffer; jpeg_read_scanlines(&cinfo, &tmpbuf, 1); for (j = 0; j
编译，运行显示如下：
