canvas.go
func InClipRect(x, y int) bool {
	return x >= canvas.clipX && y >= canvas.clipY &&
		x < canvas.clipX+canvas.clipW &&
		y < canvas.clipY+canvas.clipH
}
func InClipRect(x, y int) bool {
	return x >= canvas.clipX && y >= canvas.clipY &&
		x < canvas.clipX+canvas.clipW &&
		y < canvas.clipY+canvas.clipH
}
func InClipRect ( x , y int ) bool { return x >= canvas . clipX && y >= canvas . clipY && x < canvas . clipX + canvas . clipW && y < canvas . clipY + canvas . clipH }
// InClipRect returns true if x and y position is inside current clipping
// rectangle
InClipRect returns true if x and y position is inside current clipping rectangle