From 868fd502b952d8750425e9abb491aa0f2686ff62 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Matthias=20Kr=C3=BCger?= <matthias.krueger@famsik.de>
Date: Sat, 28 Jul 2018 17:19:56 +0200
Subject: [PATCH] reduce_alpha_to_up(): simplify code, don't convert Vec ->
 iter -> Vec in order to reverse elts, just vec.reverse(). (#127)

---
 src/png/mod.rs | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/src/png/mod.rs b/src/png/mod.rs
index c17b7215..78ce3c40 100644
--- a/src/png/mod.rs
+++ b/src/png/mod.rs
@@ -713,11 +713,9 @@ impl PngData {
 
     fn reduce_alpha_to_up(&self, bpc: usize, bpp: usize) -> Vec<u8> {
         let mut lines = Vec::new();
-        let scan_lines = self.scan_lines()
-            .collect::<Vec<ScanLine>>()
-            .into_iter()
-            .rev()
+        let mut scan_lines = self.scan_lines()
             .collect::<Vec<ScanLine>>();
+        scan_lines.reverse();
         let mut last_line = vec![0; scan_lines[0].data.len()];
         let mut current_line = Vec::with_capacity(last_line.len());
         for line in scan_lines.into_iter() {