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Keeping original image alpha info when decoding 

This fixes issue #26 and #55, after the change introduced in commit c32f9c03f816dac58a8cac25d6189310272ca9c1
This commit is contained in:
Nacho Soto 2012-10-10 16:36:53 -07:00
parent 3c4c61f54c
commit 1bf9668d97
1 changed files with 2 additions and 4 deletions
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6
SDWebImage/SDWebImageDecoder.m
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@ -98,6 +98,7 @@ static SDWebImageDecoder *sharedInstance;
{ {
CGImageRef imageRef = image.CGImage; CGImageRef imageRef = image.CGImage;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGImageAlphaInfo alphaInfo = CGImageGetAlphaInfo(imageRef);
CGContextRef context = CGBitmapContextCreate(NULL, CGContextRef context = CGBitmapContextCreate(NULL,
CGImageGetWidth(imageRef), CGImageGetWidth(imageRef),
CGImageGetHeight(imageRef), CGImageGetHeight(imageRef),
@ -107,10 +108,7 @@ static SDWebImageDecoder *sharedInstance;
// System only supports RGB, set explicitly // System only supports RGB, set explicitly
colorSpace, colorSpace,
// Makes system don't need to do extra conversion when displayed. // Makes system don't need to do extra conversion when displayed.
// NOTE: here we remove the alpha channel for performance. Most of the time, images loaded alphaInfo | kCGBitmapByteOrder32Little);
// 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); CGColorSpaceRelease(colorSpace);
if (!context) return nil; if (!context) return nil;