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<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_b86j2pjrsqppnj3ih8k4tvnoji, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
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<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
static Rect randomRect(int w, int h, int border, int rw, int rh) {
  if (rw > w-border*2 || rh > h-border*2) null;
  ret new Rect(random(border, w-border-rw), random(border, h-border-rh), rw, rh);
}

ifclass RGBImage
static Rect randomRect(RGBImage img, int rw, int rh) {
  ret randomRect(img.w(), img.h(), 0, rw, rh);
}
endif