图片模糊效果

来源：互联网发布：网络硬盘录像机的设置编辑：程序博客网时间：2024/05/29 02:56

#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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