main()
{
FBDEV fbdev;
memset(&fbdev,0,sizeof(FBDEV));
strcpy(fbdev.dev,"/dev/fb0");
if (fb_open(&fbdev)==FALSE)
{
printf("open frame buffer error\n");
return;
}
fb_memset((void *)(fbdev.fb_mem + fbdev.fb_mem_offset),0,fbdev.fb_fix.smem_len);
// fb_drawpixel(&fbdev,512,384,0x00ff0000);
// fb_drawpixel(&fbdev,512,385,0x00ff0000);
// fb_drawpixel(&fbdev,513,384,0x00ff0000);
// fb_drawpixel(&fbdev,513,385,0x00ff0000);
//画垂直方向的直线
// fb_drawvline(&fbdev,512,384,0x0000ff00);
// fb_drawwline(&fbdev,512,384,0x0000ff00);
// fb_drawfpage(&fbdev,100,384,0x0000ff00);
fb_drawxline(&fbdev,100,100,0x00ff0000);
fb_close(&fbdev);
getchar();
}
void main(void)
{
FBDEV fbdev;
memset(&fbdev,0,sizeof(FBDEV));
strcpy(fbdev.dev,"/dev/fb0");
if (fb_open(&fbdev) == FALSE)
{
printf("open frame buffer error\n");
return ;
}
fb_memset((void *)(fbdev.fb_mem + fbdev.fb_mem_offset),0,fbdev.fb_fix.smem_len);
//画点得函数：
fb_drawpixel(&fbdev,512,384,0x00ff0000);
fb_drawpixel(&fbdev,513,384,0x00ff0000);
fb_drawpixel(&fbdev,512,385,0x00ff0000);
fb_drawpixel(&fbdev,513,385,0x00ff0000);
//画直线得函数：
//fb_drawline(&fbdev,200,100,0x0000ff00);
fb_line(&fbdev,100,200,300,500,0x000000ff);
fb_circle(&fbdev,512,348,50,0x00ff0000);
fb_close(&fbdev);
getchar();
}
void fb_init(void) {
unsigned long page_mask;
struct vt_stat vts;
fb_setvt();
if(ioctl(tty, VT_GETSTATE, &vts) == -1) {
logprintf(LOG_ERR, "ioctl VT_GETSTATE: %s (not a linux console?)\n", strerror(errno));
exit(EXIT_FAILURE);
}
fbfd = open(DEFAULT_FB, O_RDWR);
if (fbfd == -1) {
logprintf(LOG_ERR, "cannot open framebuffer device");
exit(EXIT_FAILURE);
}
if(ioctl(fbfd, FBIOGET_VSCREENINFO, &ovinfo) == -1) {
logprintf(LOG_ERR, "cannnot read variable screen information");
exit(EXIT_FAILURE);
}
if(ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo) == -1) {
logprintf(LOG_ERR, "cannot read fixed screen information");
exit(EXIT_FAILURE);
}
if(ovinfo.bits_per_pixel == 8 || finfo.visual == FB_VISUAL_DIRECTCOLOR) {
if(ioctl(fbfd, FBIOGETCMAP, &ocmap) == -1) {
logprintf(LOG_ERR, "ioctl FBIOGETCMAP");
exit(EXIT_FAILURE);
}
}
if(ioctl(tty, KDGETMODE, &kd_mode) == -1) {
logprintf(LOG_ERR, "ioctl KDGETMODE");
exit(EXIT_FAILURE);
}
if(ioctl(tty, VT_GETMODE, &vt_omode) == -1) {
logprintf(LOG_ERR, "ioctl VT_GETMODE");
exit(EXIT_FAILURE);
}
tcgetattr(tty, &term);
if(ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo) == -1) {
logprintf(LOG_ERR,"ioctl FBIOGET_VSCREENINFO");
exit(EXIT_FAILURE);
}
if(ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo) == -1) {
logprintf(LOG_ERR, "ioctl FBIOGET_FSCREENINFO");
exit(EXIT_FAILURE);
}
screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;
page_mask = (unsigned long)getpagesize()-1;
fb_mem_offset = (unsigned long)(finfo.smem_start) & page_mask;
fbp = (char *)mmap(0, finfo.smem_len+fb_mem_offset, PROT_READ | PROT_WRITE, MAP_SHARED, fbfd, 0);
if((int)fbp == -1) {
logprintf(LOG_ERR, "failed to map framebuffer device to memory");
exit(EXIT_FAILURE);
}
if(ioctl(tty, KDSETMODE, KD_GRAPHICS) == -1) {
logprintf(LOG_ERR, "ioctl KDSETMODE");
fb_cleanup();
exit(EXIT_FAILURE);
}
fb_memset(fbp+fb_mem_offset, 0, finfo.line_length * vinfo.yres);
fb_init_zmap();
}
void fb_clear_screen(void) {
fb_memset(fbp, 0, finfo.line_length * vinfo.yres);
}
void fb_clear_mem(void) {
fb_memset(fbp, 0, finfo.smem_len);
}
void fb_drawhline(PFBDEV pFbdev,int x,int y,u32_t color)
{
int i;
for (i = 0; i < pFbdev->fb_var.xres; i++)
{
fb_drawpixel(pFbdev,i,y,color);
}
return;
int fb_line(int x1,int y1,int x2,int y2,u32_t color)
{
int dx=x2-x1;
int dy=y2-y1;
int p=0;
int inc=((dx*dy<0)?-1:1);
if(abs(dx)>abs(dy))
{
if(dx<0)
{
swap(&x1,&x2);
swap(&y1,&y2);
dx=-dx;
dy=-dy;
}
dy=abs(dy);
p=2*dy-dx;
while(x1<=x2)
{
fb_one_pixel(x1,y1,color);
x1++;
if(p<0)
{
p+=2*dy;
}
else
{ y1+=inc; p+=2*(dy-dx);
} } }
else { if(dy<0)
{ swap(&x1,&x2); swap(&y1,&y2);
dx=-dx; dy=-dy;
} dx=abs(dx); p=2*dx-dy;
while(y1<=y2) { fb_one_pixel(x1,y1,color);
y1++;
if(p<0)
{
p+=2*dx;
}
else
{
x1+=inc;
p+=2*(dx-dy);
}
} }
return 0;
int main(void)
{
FBDEV fbdev;
memset(&fbdev,0,sizeof(FBDEV));
strcpy(fbdev.dev,"/dev/fb0");
if (fb_open(&fbdev)==FALSE)
{
printf("open frame buffer error\n");
return;
}
fb_memset((void *)(fbdev.fb_mem + fbdev.fb_mem_offset),0,fbdev.fb_fix.smem_len);
//画点
fb_drawpixel(&fbdev,512,384,0x00FF0000);
fb_drawpixel(&fbdev,513,384,0x00FF0000);
fb_drawpixel(&fbdev,512,385,0x00FF0000);
fb_drawpixel(&fbdev,513,385,0x00FF0000);
//画垂直线
fb_drawvline(&fbdev,511,380,0x0000ff00);
fb_drawhline(&fbdev,380,200,0x000000ff);
fb_close(&fbdev);
getchar();
}
