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Fix CGBitmapContextCreate errors (fix #204)

This commit is contained in:
Olivier Poitrey 2012-11-12 00:05:19 +01:00
parent 6df9f76669
commit 65d28ab294
1 changed files with 6 additions and 25 deletions
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31
SDWebImage/SDWebImageDecoder.m
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@ -96,36 +96,17 @@ static SDWebImageDecoder *sharedInstance;
+ (UIImage *)decodedImageWithImage:(UIImage *)image
{
CGImageRef imageRef = image.CGImage;
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGImageAlphaInfo alphaInfo = CGImageGetAlphaInfo(imageRef);
CGImageAlphaInfo alphaInfo = CGImageGetAlphaInfo(image.CGImage);
BOOL imageHasAlphaInfo = (alphaInfo != kCGImageAlphaNone &&
alphaInfo != kCGImageAlphaNoneSkipFirst &&
alphaInfo != kCGImageAlphaNoneSkipLast);
int bytesPerPixel = alphaInfo != kCGImageAlphaNone ? 4 : 3;
CGBitmapInfo bitmapInfo = imageHasAlphaInfo ? kCGImageAlphaPremultipliedLast : alphaInfo;
UIGraphicsBeginImageContextWithOptions(image.size, !imageHasAlphaInfo, 0);
CGRect rect = (CGRect){.origin = CGPointZero, .size = image.size};
[image drawInRect:rect];
UIImage *decompressedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
CGContextRef context = CGBitmapContextCreate(NULL,
CGImageGetWidth(imageRef),
CGImageGetHeight(imageRef),
8,
// Just always return width * bytesPerPixel will be enough
CGImageGetWidth(imageRef) * bytesPerPixel,
// System only supports RGB, set explicitly
colorSpace,
bitmapInfo);
CGColorSpaceRelease(colorSpace);
if (!context) return nil;
CGRect rect = (CGRect){CGPointZero,{CGImageGetWidth(imageRef), CGImageGetHeight(imageRef)}};
CGContextDrawImage(context, rect, imageRef);
CGImageRef decompressedImageRef = CGBitmapContextCreateImage(context);
CGContextRelease(context);
UIImage *decompressedImage = [[UIImage alloc] initWithCGImage:decompressedImageRef scale:image.scale orientation:image.imageOrientation];
CGImageRelease(decompressedImageRef);
return SDWIReturnAutoreleased(decompressedImage);
}