init_cursor.c

TI dm6446 video subsytem window blending programme

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <asm/page.h>
#include <linux/fb.h>
#include <time.h>
#include <sys/time.h>

#include "davinci_fb.h"

#undef DBG
#define DBG(x,...)

struct Cursor_Info
{
    int xp;
    int yp;
    int xl;
    int yl;
};

#define FBIO_MOVECURSOR    _IOW('F', 0x24,  struct Cursor_Info)

enum {xlmax = 128};
enum {ylmax = 64};
enum {xpmax = 720 - xlmax};
enum {ypmax = 480 - ylmax};

int get_random(int maxvalue)
{
	float ret;
	int randnum;

	struct timeval tv;
	gettimeofday(&tv, NULL);

	srandom(tv.tv_usec + maxvalue);
	randnum = random();
	ret = 1 + (unsigned char) ((float)maxvalue * (float)randnum / (float)(RAND_MAX + 1.0));
	
	DBG("randnum[%d]: %d -> %d\n", maxvalue, randnum, (int)ret);
	return (int)ret;
}

int init_cursor(int xp, int yp, int xl, int yl, int random)
{
	int  fd;
	struct Cursor_Info cur_;

	if(!random)
	{
		cur_.xp = xp;
		cur_.yp = yp;
		cur_.xl = xl;
		cur_.yl = yl;
	}
	else
	{
        cur_.xp = get_random(xpmax / 16) * 16;
        cur_.yp = get_random(ypmax / 16) * 16;
        cur_.xl = get_random(xlmax / 16) * 16;
        cur_.yl = get_random(ylmax / 16) * 16;
	}


	DBG("Cursor: (%d, %d) [%d, %d]\n", cur_.xp, cur_.yp, cur_.xl, cur_.yl);

	fd = open(OSD_DEVICE, O_RDWR);

	if (fd == -1) {  
		ERR("Failed to open fb device %s (%s)\n",  strerror(errno));
		return FAILURE;
	}

	if (ioctl(fd, FBIO_MOVECURSOR, &cur_) == -1)
	{
		ERR("Failed to set cursor info.\n");
		return FAILURE; 
	}

	return SUCCESS;
}