Conway Game of Life - 321 bytes in Processing - Code Golf submission

Conway Game of Life.pde

/*
Rick Companje, 2022-06-09, MIT
Code Golf submission: Shortest Game of Life
289 bytes in Processing/Java
https://codegolf.stackexchange.com/questions/3434/shortest-game-of-life

grid 100x100
grid wraps around 
draw custom pattern with mouse
*/

void draw(){if(mousePressed){line(pmouseX,pmouseY,mouseX,mouseY);return;}
loadPixels();PImage p=get();for(int i=0,x=0,y=0,n=0,w=100,h=100;i<w*h;i++,
x=i%w,y=i/w,n=0){for(int j=0;j<9;j++)n+=p.get((x+j%3-1+w)%w,(y+j/3-1+h)%h)
/color(0);if(n==3|n!=4)pixels[i]=color(n==3?0:255);}updatePixels();}




//ungolfed:

void draw() {
  if (mousePressed) {
    line(pmouseX, pmouseY, mouseX, mouseY);
    return;
  }
  loadPixels();
  PImage p=get();
  for (int i=0, x=0, y=0, n=0, w=100, h=100; i<w*h; i++,
    x=i%w, y=i/w, n=0) {
    for (int j=0; j<9; j++)n+=p.get((x+j%3-1+w)%w, (y+j/3-1+h)%h)/color(0);
    if (n==3|n!=4)pixels[i]=color(n==3?0:255);
  }
  updatePixels();
}