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fix image alpha premultiplied #140

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fix image alpha premultiplied #140

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18 changes: 17 additions & 1 deletion FXBlurView/FXBlurView.m
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Original file line number Diff line number Diff line change
Expand Up @@ -117,10 +117,26 @@ - (UIImage *)blurredImageWithRadius:(CGFloat)radius iterations:(NSUInteger)itera
free(buffer2.data);
free(tempBuffer);

CGImageAlphaInfo alphaInfo = CGImageGetBitmapInfo(imageRef) & kCGBitmapAlphaInfoMask;

//Since iOS8 it's not allowed anymore to create contexts with unmultiplied Alpha info
if (alphaInfo == kCGImageAlphaLast) {
alphaInfo = kCGImageAlphaPremultipliedLast;
}
if (alphaInfo == kCGImageAlphaFirst) {
alphaInfo = kCGImageAlphaPremultipliedFirst;
}

//reset the bits
CGBitmapInfo newBitmapInfo = CGImageGetBitmapInfo(imageRef) & ~kCGBitmapAlphaInfoMask;

//set the bits to the new alphaInfo
newBitmapInfo |= alphaInfo;

//create image context from buffer
CGContextRef ctx = CGBitmapContextCreate(buffer1.data, buffer1.width, buffer1.height,
8, buffer1.rowBytes, CGImageGetColorSpace(imageRef),
CGImageGetBitmapInfo(imageRef));
newBitmapInfo);

//apply tint
if (tintColor && CGColorGetAlpha(tintColor.CGColor) > 0.0f)
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