shithub: oledsaver

ref: d4fa0493e43ad94c1f419d162e0d1ab224a33cf5
dir: /main.c/

#include <u.h>
#include <libc.h>
#include <draw.h>
#include "memdraw.h"

#define NPIXELS 4032

void
usage(void)
{
	sysfatal("usage: %s [ -f subfont ] text", argv0);
}

void
writeuncompressed(int fd, Memimage *m)
{
	char chanstr[32];
	int bpl, y, j;
	uchar *buf;

	if(chantostr(chanstr, m->chan) == nil)
		sysfatal("can't convert channel descriptor: %r");
	fprint(fd, "%11s %11d %11d %11d %11d ",
		chanstr, m->r.min.x, m->r.min.y, m->r.max.x, m->r.max.y);

	bpl = bytesperline(m->r, m->depth);
	buf = malloc(bpl);
	if(buf == nil)
		sysfatal("malloc failed: %r");
	for(y=m->r.min.y; y<m->r.max.y; y++){
		j = unloadmemimage(m, Rect(m->r.min.x, y, m->r.max.x, y+1), buf, bpl);
		if(j != bpl)
			sysfatal("image unload failed → %r");
		//if(write(fd, buf, bpl) != bpl)
		if(write(fd, buf, bpl) != bpl)
			sysfatal("wu write failed → %r");
	}
	free(buf);
}


void
main(int argc, char **argv)
{
	Memimage *img;
	# 126 x 32 oled ⇒ 4032 pixels
	int h,w,i;
	h = 32;
	w = 126;
	long ms;
	ms = 1000;
	Point topleft;
	double angle;
	//angle = 0.0;
	Rectangle pixel;
	pixel.min.x = -1;
	pixel.min.y = 1;
	pixel.max.y = 2;
	pixel.max.x = 2;
	char *path;
	path = "/mnt/reform/kbdoled";

	Rectangle r;
	int fd;

	ARGBEGIN{
	default:
		usage();
	}ARGEND;
	
	if (memimageinit())
		sysfatal("memimageinit failed: %r");

	for(;;){
		r.min.x = 0;
		r.min.y = 0;
		r.max.x = 1;
		r.max.y = 1;
		angle = truerand();

		fd = open(path, OWRITE);
		if(fd < 0){
			sysfatal("could not open kbdoled file → %r");
		}

		img = allocmemimage(Rect(0, 0, w, h), GREY1);
		if (!img)
			sysfatal("cannot allocate memimage: %r");
		memfillcolor(img, DBlack);
		topleft.y = 0;
		topleft.x = 0;
		for(i=0;i<w;i+=3){

			r.min.x = abs(i%w);
			r.min.y = abs(((int)(50.0*sin(angle*PI/180)))%h);
			r.max.x = r.min.x+1;
			r.max.y = r.min.y+1;
			//fprint(2, "(x=%d,y=%d) to (x=%d,y=%d)\n", r.min.x, r.min.y, r.max.x, r.max.y);

			memimagedraw(img, r, memwhite, ZP, nil, ZP, SoverD);
			
		
			angle+=5;
		}

		writeuncompressed(fd, img);
		freememimage(img);
		fd = close(fd);
		if(fd < 0)
			sysfatal("close failed → %r");
		
		sleep(ms);
	}
	
}