From 9d4782106213f67fee4210a0ebc84ad0846bc8e9 Mon Sep 17 00:00:00 2001
From: Matthew Gordon <matthew.scott.gordon@gmail.com>
Date: Tue, 12 Nov 2019 16:47:56 -0500
Subject: [PATCH] Change memory layout of Image, so it's not drawn upside-down
 by SDL

---
 src/image.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/image.rs b/src/image.rs
index 9afc418..1944585 100644
--- a/src/image.rs
+++ b/src/image.rs
@@ -24,7 +24,7 @@ impl OutputImage {
 
     pub fn set_color(&mut self, row: u32, column: u32, red: u8, green: u8, blue: u8) {
         assert!(row < self.height && column < self.width);
-        let index = ((row * self.width + column) * self.channels) as usize;
+        let index = (((self.height - (row + 1)) * self.width + column) * self.channels) as usize;
         self.pixel_data[index] = red;
         self.pixel_data[index + 1] = green;
         self.pixel_data[index + 2] = blue;