func PushClip() {
	c := rect{x: canvas.clipX, y: canvas.clipY, w: canvas.clipW, h: canvas.clipH}
	canvas.clipStack = append(canvas.clipStack, c)
}
func PushClip() {
	c := rect{x: canvas.clipX, y: canvas.clipY, w: canvas.clipW, h: canvas.clipH}
	canvas.clipStack = append(canvas.clipStack, c)
}
func PushClip ( ) { c := rect { x : canvas . clipX , y : canvas . clipY , w : canvas . clipW , h : canvas . clipH } canvas . clipStack = append ( canvas . clipStack , c ) }
// PushClip saves the current clipping window
PushClip saves the current clipping window