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+/* This file is adapted from DKLiveBlur - https://github.com/kronik/DKLiveBlur
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+ *
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+ * Copyright (C) 2013 by Dmitry Klimkin
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+ *
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+ * Permission is hereby granted, free of charge, to any person obtaining a copy
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+ * of this software and associated documentation files (the "Software"), to deal
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+ * in the Software without restriction, including without limitation the rights
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+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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+ * copies of the Software, and to permit persons to whom the Software is
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+ * furnished to do so, subject to the following conditions:
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+ *
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+ * The above copyright notice and this permission notice shall be included in
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+ * all copies or substantial portions of the Software.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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+ * THE SOFTWARE. */
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+
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+#import <Accelerate/Accelerate.h>
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+
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+@implementation UIImage (Blur)
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+
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++ (UIImage *)applyBlurOnImage:(UIImage *)imageToBlur withRadius:(CGFloat)blurRadius {
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+ if ((blurRadius < 0.0f) || (blurRadius > 1.0f)) {
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+ blurRadius = 0.5f;
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+ }
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+
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+ int boxSize = (int)(blurRadius * 100);
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+ boxSize -= (boxSize % 2) + 1;
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+
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+ CGImageRef rawImage = imageToBlur.CGImage;
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+
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+ vImage_Buffer inBuffer, outBuffer;
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+ vImage_Error error;
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+ void *pixelBuffer;
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+
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+ CGDataProviderRef inProvider = CGImageGetDataProvider(rawImage);
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+ CFDataRef inBitmapData = CGDataProviderCopyData(inProvider);
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+
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+ inBuffer.width = CGImageGetWidth(rawImage);
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+ inBuffer.height = CGImageGetHeight(rawImage);
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+ inBuffer.rowBytes = CGImageGetBytesPerRow(rawImage);
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+ inBuffer.data = (void*)CFDataGetBytePtr(inBitmapData);
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+
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+ pixelBuffer = malloc(CGImageGetBytesPerRow(rawImage) * CGImageGetHeight(rawImage));
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+
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+ outBuffer.data = pixelBuffer;
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+ outBuffer.width = CGImageGetWidth(rawImage);
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+ outBuffer.height = CGImageGetHeight(rawImage);
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+ outBuffer.rowBytes = CGImageGetBytesPerRow(rawImage);
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+
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+ error = vImageBoxConvolve_ARGB8888(&inBuffer, &outBuffer, NULL,
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+ 0, 0, boxSize, boxSize, NULL,
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+ kvImageEdgeExtend);
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+ if (error)
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+ APLog(@"blur error: convolution failed");
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+
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+ CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
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+
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+ CGContextRef ctx = CGBitmapContextCreate(outBuffer.data,
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+ outBuffer.width,
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+ outBuffer.height,
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+ 8,
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+ outBuffer.rowBytes,
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+ colorSpace,
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+ CGImageGetBitmapInfo(imageToBlur.CGImage));
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+
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+ CGImageRef imageRef = CGBitmapContextCreateImage (ctx);
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+ UIImage *returnImage = [UIImage imageWithCGImage:imageRef];
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+
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+ //clean up
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+ CGContextRelease(ctx);
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+ CGColorSpaceRelease(colorSpace);
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+
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+ free(pixelBuffer);
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+ CFRelease(inBitmapData);
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+ CGImageRelease(imageRef);
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+
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+ return returnImage;
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+}
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+
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+@end
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Felix Paul Kühne