图片模糊效果

本文主要是介绍图片模糊效果，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

#import "UIImage+Blur.h"

#import <Accelerate/Accelerate.h>

@implementation UIImage (Blur)

//图片模糊方法

+ (UIImage *)boxblurImage:(UIImage *)image withBlurNumber:(CGFloat)blur{

    if (blur < 0.f||blur > 1.f) {

        blur = 0.5f;

    }

    int boxSize = (int)(blur *40);

    boxSize = boxSize - (boxSize %2)+1;

    

    CGImageRef img = image.CGImage;

    

    vImage_Buffer inBuffer,outBuffer;

    vImage_Error error;

    

    void *pixelBuffer;

    //从CGImage中获取数据

    CGDataProviderRef inProvider = CGImageGetDataProvider(img);

    CFDataRef inBitmapData = CGDataProviderCopyData(inProvider);

    //设置从CGImage获取对象属性

    inBuffer.width = CGImageGetWidth(img);

    inBuffer.height = CGImageGetHeight(img);

    inBuffer.rowBytes = CGImageGetBytesPerRow(img);

    inBuffer.data = (void *)CFDataGetBytePtr(inBitmapData);

    pixelBuffer = malloc(CGImageGetBytesPerRow(img)*CGImageGetHeight(img));

    

    if (pixelBuffer == NULL) {

        NSLog(@"No pixelbuffer");

    }

    outBuffer.data = pixelBuffer;

    outBuffer.width = CGImageGetWidth(img);

    outBuffer.height = CGImageGetHeight(img);

    outBuffer.rowBytes = CGImageGetBytesPerRow(img);

    

    error = vImageBoxConvolve_ARGB8888(&inBuffer, &outBuffer, NULL, 0, 0, boxSize, boxSize, NULL, kvImageEdgeExtend);

    if (error) {

        NSLog(@"error from convolution %ld",error);

    }

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

    CGContextRef ctx = CGBitmapContextCreate(outBuffer.data, outBuffer.width, outBuffer.height, 8, outBuffer.rowBytes, colorSpace, kCGImageAlphaNoneSkipLast);

    CGImageRef imageRef = CGBitmapContextCreateImage(ctx);

    UIImage *returnImage =[UIImage imageWithCGImage:imageRef];

    

    //clean up

    CGContextRelease(ctx);

    CGColorSpaceRelease(colorSpace);

    free(pixelBuffer);

    CFRelease(inBitmapData);

    //CGColorSpaceRelease(colorSpace);//******

    CGImageRelease(imageRef);

    return returnImage;

}

//模糊图片方法

+ (UIImage *)coreBlurImage:(UIImage *)image withBlurNumber:(CGFloat)blur{

    CIContext *context = [CIContext contextWithOptions:nil];

    CIImage *inputImage =[CIImage imageWithCGImage:image.CGImage];

    CIFilter *filter =[CIFilter filterWithName:@"CIGaussianBlur"];

    [filter setValue:inputImage forKey:kCIInputImageKey];

    [filter setValue:@(blur) forKey:@"inputRadius"];

    //模糊图片

    CIImage *result =[filter valueForKey:kCIOutputImageKey];

    CGImageRef outImage =[context createCGImage:result fromRect:[result extent]];

    UIImage *blurImage =[UIImage imageWithCGImage:outImage];

    CGImageRelease(outImage);

    return blurImage;

}

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