//
//  KWMImageBlurUtil.m
//  iCemarose
//
//  Created by HouWeiBin on 2017/4/28.
//  Copyright © 2017年 kollway. All rights reserved.
//


//高斯模糊工具类
#import "KWMImageBlurUtil.h"

@implementation KWMImageBlurUtil

+(UIImage *)getBlurImage:(UIView *)view{
    //1、开启上下文
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, NO, 0);
    
    //2.获取当前上下文
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    
    //3.截屏
    [view.layer renderInContext:ctx];
    
    //4、获取新图片
    UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
    
    UIGraphicsEndImageContext();

    return newImage;
}

//废弃方法，该方法会需要1-2秒，不建议使用
+(UIImage *)startBlur:(UIImage *)image withBlurNumber:(CGFloat)blur{
    CIContext *context = [CIContext contextWithOptions:nil];
    CIImage *inputImage= [CIImage imageWithCGImage:image.CGImage];
    //设置filter
    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;
}



@end