From c32f9c03f816dac58a8cac25d6189310272ca9c1 Mon Sep 17 00:00:00 2001
From: Olivier Poitrey <rs@dailymotion.com>
Date: Wed, 12 Sep 2012 02:45:54 +0200
Subject: [PATCH] Remove alpha channel (may break some PNG/GIF with alpha, pull
 request welcome)

---
 SDWebImage/SDWebImageDecoder.m | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/SDWebImage/SDWebImageDecoder.m b/SDWebImage/SDWebImageDecoder.m
index 623255b..9b6e50c 100644
--- a/SDWebImage/SDWebImageDecoder.m
+++ b/SDWebImage/SDWebImageDecoder.m
@@ -107,7 +107,10 @@ static SDWebImageDecoder *sharedInstance;
                                                  // System only supports RGB, set explicitly
                                                  colorSpace,
                                                  // Makes system don't need to do extra conversion when displayed.
-                                                 kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Little); 
+                                                 // NOTE: here we remove the alpha channel for performance. Most of the time, images loaded
+                                                 //       from the network are jpeg with no alpha channel. As a TODO, finding a way to detect
+                                                 //       if alpha channel is necessary would be nice.
+                                                 kCGImageAlphaNoneSkipLast | kCGBitmapByteOrder32Little);
     CGColorSpaceRelease(colorSpace);
     if (!context) return nil;