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#include <u.h>
#include <libc.h>
#include <thread.h>
#include <draw.h>
#include <mouse.h>
#include <keyboard.h>
#include <geometry.h>
#include "dat.h"
#include "fns.h"
static void
sprite_step(Sprite *spr, ulong Δt)
{
if(spr->nframes < 2)
return;
spr->elapsed += Δt;
if(spr->elapsed >= spr->period){
spr->elapsed -= spr->period;
spr->curframe = ++spr->curframe % spr->nframes;
}
}
static void
sprite_draw(Sprite *spr, Image *dst, Point dp)
{
Point sp = (Point){
spr->curframe * Dx(spr->r),
0
};
sp = addpt(spr->sp, sp);
draw(dst, rectaddpt(spr->r, dp), spr->sheet, nil, sp);
}
static Sprite *
sprite_clone(Sprite *spr)
{
return newsprite(spr->sheet, spr->sp, spr->r, spr->nframes, spr->period);
}
Sprite *
newsprite(Image *sheet, Point sp, Rectangle r, int nframes, ulong period)
{
Sprite *spr;
spr = emalloc(sizeof(Sprite));
spr->sheet = sheet;
spr->sp = sp;
spr->r = r;
spr->nframes = nframes;
spr->curframe = 0;
spr->period = period;
spr->elapsed = 0;
spr->step = sprite_step;
spr->draw = sprite_draw;
spr->clone = sprite_clone;
return spr;
}
Sprite *
readsprite(char *sheetfile, Point sp, Rectangle r, int nframes, ulong period)
{
Image *sheet;
int fd;
fd = open(sheetfile, OREAD);
if(fd < 0)
sysfatal("readsprite: %r");
sheet = readimage(display, fd, 1);
close(fd);
return newsprite(sheet, sp, r, nframes, period);
}
static void
decproc(void *arg)
{
int fd, *pfd;
pfd = arg;
fd = pfd[2];
close(pfd[0]);
dup(fd, 0);
close(fd);
dup(pfd[1], 1);
close(pfd[1]);
execl("/bin/png", "png", "-t9", nil);
sysfatal("execl: %r");
}
Image *
readpngimage(char *path)
{
Image *i;
int fd, pfd[3];
if(pipe(pfd) < 0)
sysfatal("pipe: %r");
fd = open(path, OREAD);
if(fd < 0)
sysfatal("open: %r");
pfd[2] = fd;
switch(fork()){
case -1:
sysfatal("fork: %r");
case 0:
decproc(pfd);
default:
close(pfd[1]);
i = readimage(display, pfd[0], 1);
close(pfd[0]);
close(fd);
}
return i;
}
Sprite *
readpngsprite(char *sheetfile, Point sp, Rectangle r, int nframes, ulong period)
{
Image *sheet;
sheet = readpngimage(sheetfile);
if(sheet == nil)
sysfatal("readpngimage: %r");
return newsprite(sheet, sp, r, nframes, period);
}
void
delsprite(Sprite *spr)
{
//freeimage(spr->sheet);
free(spr);
}
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