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#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include "linux/fb.h"
#include "sys/ioctl.h"
void setMode(struct fb_var_screeninfo *var);
void pan(int fd, struct fb_var_screeninfo *var, int x, int y);
void cursor(int fd);
int main(int argc, char **argv)
{
struct fb_var_screeninfo var;
struct fb_fix_screeninfo fix;
const char* name = "/dev/fb0";
int fd = open(name, O_RDONLY);
if (fd == -1) {
printf("open %s : %s\n", name, strerror(errno));
return 1;
}
memset(&var, 0, sizeof(struct fb_var_screeninfo));
memset(&fix, 0, sizeof(struct fb_fix_screeninfo));
if (ioctl(fd, FBIOGET_VSCREENINFO, &var))
printf("var %s\n", strerror(errno));
if (ioctl(fd, FBIOGET_FSCREENINFO, &fix))
printf("fix %s\n", strerror(errno));
setMode(&var);
printf("pan: 0, 0\n");
pan(fd, &var, 0, 0);
sleep(2);
printf("pan: 100, 0\n");
pan(fd, &var, 100, 0);
sleep(2);
printf("pan: 0, 100\n");
pan(fd, &var, 0, 100);
sleep(2);
printf("pan: 100, 100\n");
pan(fd, &var, 100, 100);
sleep(2);
printf("pan: 0, 0\n");
pan(fd, &var, 0, 0);
sleep(2);
printf("cursor\n");
cursor(fd);
return 0;
}
void pan(int fd, struct fb_var_screeninfo *var, int x, int y)
{
var->xoffset = x;
var->yoffset = y;
var->activate = FB_ACTIVATE_NOW;
if (ioctl(fd, FBIOPUT_VSCREENINFO, var))
printf("pan error: %s\n", strerror(errno));
}
/*
* Currently isn't supported in the driver
*/
void cursor(int fd)
{
struct fb_cursor cur;
void *data = malloc(64 * 64 * 4);
memset(&cur, 0, sizeof(cur));
cur.set = FB_CUR_SETIMAGE | FB_CUR_SETPOS | FB_CUR_SETSIZE;
cur.enable = 1;
cur.image.dx = 1;
cur.image.dy = 1;
cur.image.width = 2;
cur.image.height = 2;
cur.image.depth = 32;
cur.image.data = data;
if (ioctl(fd, FBIO_CURSOR, &cur))
printf("cursor error: %s\n", strerror(errno));
sleep(2);
memset(&cur, 0, sizeof(cur));
cur.set = FB_CUR_SETPOS;
cur.enable = 0;
cur.image.dx = 100;
cur.image.dy = 100;
if (ioctl(fd, FBIO_CURSOR, &cur))
printf("cursor error: %s\n", strerror(errno));
free(data);
}
struct drm_mode
{
int clock;
int hdisplay;
int hsync_start;
int hsync_end;
int htotal;
int hskew;
int vdisplay;
int vsync_start;
int vsync_end;
int vtotal;
int vscan;
int vrefresh;
int flags;
};
struct drm_mode mode =
{
.clock = 25200,
.hdisplay = 640,
.hsync_start = 656,
.hsync_end = 752,
.htotal = 800,
.hskew = 0,
.vdisplay = 480,
.vsync_start = 490,
.vsync_end = 492,
.vtotal = 525,
.vscan = 0,
.vrefresh = 60000, /* vertical refresh * 1000 */
.flags = 10,
};
void setMode(struct fb_var_screeninfo *var) {
var->activate = FB_ACTIVATE_NOW;
var->xres = mode.hdisplay;
var->right_margin = mode.hsync_start - mode.hdisplay;
var->hsync_len = mode.hsync_end - mode.hsync_start;
var->left_margin = mode.htotal - mode.hsync_end;
var->yres = mode.vdisplay;
var->lower_margin = mode.vsync_start - mode.vdisplay;
var->vsync_len = mode.vsync_end - mode.vsync_start;
var->upper_margin = mode.vtotal - mode.vsync_end;
var->pixclock = 10000000 / mode.htotal * 1000 / mode.vtotal * 100;
/* avoid overflow */
var->pixclock = var->pixclock * 1000 / mode.vrefresh;
}
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