From c4abba5d8a41f173ccab6d9d34c3c89d7d6a12e0 Mon Sep 17 00:00:00 2001
From: Ryan Oldenburg <guzba8@gmail.com>
Date: Wed, 27 Jan 2021 03:11:37 -0600
Subject: [PATCH] - assert, + exception

---
 src/pixie/images.nim | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/pixie/images.nim b/src/pixie/images.nim
index 6f399f0..0172a8d 100644
--- a/src/pixie/images.nim
+++ b/src/pixie/images.nim
@@ -519,10 +519,14 @@ proc shift*(image: Image, offset: Vec2) =
 
 proc spread*(image: Image, spread: float32) =
   ## Grows the image as a mask by spread.
+  if spread == 0:
+    return
+  if spread < 0:
+    raise newException(PixieError, "Cannot apply negative spread")
+
   let
     copy = image.copy()
     spread = round(spread).int
-  assert spread > 0
   for y in 0 ..< image.height:
     for x in 0 ..< image.width:
       var maxAlpha = 0.uint8