From 81565459c65ca296f5fc5c2e06d894db64364e14 Mon Sep 17 00:00:00 2001
From: Nicolas Silva <nical@fastmail.com>
Date: Fri, 8 Dec 2017 16:08:36 +0100
Subject: [PATCH] Add Size::is_empty_or_negative.

---
 src/size.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/size.rs b/src/size.rs
index cdd107d..7211fad 100644
--- a/src/size.rs
+++ b/src/size.rs
@@ -121,6 +121,13 @@ where T: Copy + One + Add<Output=T> + Sub<Output=T> + Mul<Output=T> {
     }
 }
 
+impl<T: Zero + PartialOrd, U> TypedSize2D<T, U> {
+    pub fn is_empty_or_negative(&self) -> bool {
+        let zero = T::zero();
+        self.width <= zero || self.height <= zero
+    }
+}
+
 impl<T: Zero, U> TypedSize2D<T, U> {
     pub fn zero() -> Self {
         TypedSize2D::new(