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When store image with no data for SDImageCache, check whether it contains alpha to use PNG or JPEG format

This commit is contained in:
DreamPiggy 2017-12-19 23:13:41 +08:00
parent bfe92374d0
commit 2872f94a3a
1 changed files with 8 additions and 2 deletions
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10
SDWebImage/SDImageCache.m
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@ -217,8 +217,14 @@ FOUNDATION_STATIC_INLINE NSUInteger SDCacheCostForImage(UIImage *image) {
@autoreleasepool { @autoreleasepool {
NSData *data = imageData; NSData *data = imageData;
if (!data && image) { if (!data && image) {
// If we do not have any data to detect image format, use PNG format // If we do not have any data to detect image format, check whether it contains alpha channel to use PNG or JPEG format
data = [[SDWebImageCodersManager sharedInstance] encodedDataWithImage:image format:SDImageFormatPNG]; SDImageFormat format;
if (SDCGImageRefContainsAlpha(image.CGImage)) {
format = SDImageFormatPNG;
} else {
format = SDImageFormatJPEG;
}
data = [[SDWebImageCodersManager sharedInstance] encodedDataWithImage:image format:format];
} }
[self storeImageDataToDisk:data forKey:key]; [self storeImageDataToDisk:data forKey:key];
} }