linux下利用framebuffer画点的程序小例子

/* * ===================================================================================== * * Filename: framebuffer.c * * Description: linux下利用framebuffer画点的程序小例子 * * Version: 1.0 * Created: 2011年02月25日 10时33分29秒 * Revision: none * Compiler: gcc * * Author: [e-mail] * Company: * * ===================================================================================== */#include <stdio.h>#include <stdlib.h> #include <fcntl.h> #include <sys/mman.h>#include <linux/fb.h>#include <unistd.h>int main(int argc, char* argv[]){int fb;int w, h;int *fbmem;struct fb_var_screeninfo fb_var;int bits;int i;//打开设备文件fb0fb = open("/dev/fb0", O_RDWR);if(fb < 0){printf("open fb0 error!/n"); exit(0);}//获取设备信息ioctl(fb, FBIOGET_VSCREENINFO, &fb_var);w = fb_var.xres;h = fb_var.yres;bits = fb_var.bits_per_pixel;printf("Framebuffer:%d * %d/n", w, h); printf("Bits:%d/n", bits);//映射空间fbmem = mmap(0, w*h*sizeof(int), PROT_READ | PROT_WRITE, MAP_SHARED, fb, 0);*(fbmem + w * 300 + 400) = 0xffffff;return 0; }