iOS实现毛玻璃效果,图片模糊效果的三种方法

概述iOS实现毛玻璃效果,图片模糊效果的三种方法

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第一种使用Core Image进行模糊

- (UIImage *)blurryImage:(UIImage *)image              withBlurLevel:(CGfloat)blur {      CIImage *inputimage = [CIImage imageWithCGImage:image.CGImage];      CIFilter *filter = [CIFilter filterWithname:@"CIGaussianBlur"                           keysAndValues:kCIInputimageKey,inputimage,@"inputRadius",@(blur),nil];             CIImage *outputimage = filter.outputimage;             CGImageRef outimage = [self.context createCGImage:outputimage                                      fromrect:[outputimage extent]];      return [UIImage imageWithCGImage:outimage];  }

第二种使用vImage API进行模糊

- (UIImage *)blurryImage:(UIImage *)image withBlurLevel:(CGfloat)blur {      if (blur < 0.f || blur > 1.f) {          blur = 0.5f;      }      int BoxSize = (int)(blur * 100);      BoxSize = BoxSize - (BoxSize % 2) + 1;             CGImageRef img = image.CGImage;             vImage_Buffer inBuffer,outBuffer;      vImage_Error error;             voID *pixelBuffer;             CGDataProvIDerRef inProvIDer = CGImageGetDataProvIDer(img);      CFDataRef inBitmapData = CGDataProvIDercopyData(inProvIDer);             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,BoxSize,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;  }  

第三种方法是网上找到的(毛玻璃效果)

// 内部方法,核心代码,封装了毛玻璃效果 参数:半径,颜色,色彩饱和度- (UIImage *)imageBlureDWithRadius:(CGfloat)blurRadius tintcolor:(UIcolor *)tintcolor saturationDeltaFactor:(CGfloat)saturationDeltaFactor maskImage:(UIImage *)maskImage {    CGRect imageRect = { CGPointZero,self.size };    UIImage *effectimage = self;    BOol hasBlur = blurRadius > __FLT_EPSILON__;    BOol hasSaturationChange = fabs(saturationDeltaFactor - 1.) > __FLT_EPSILON__;    if (hasBlur || hasSaturationChange) {        UIGraphicsBeginImageContextWithOptions(self.size,NO,[[UIScreen mainScreen] scale]);        CGContextRef effectInContext = UIGraphicsGetCurrentContext();        CGContextScaleCTM(effectInContext,1.0,-1.0);        CGContextTranslateCTM(effectInContext,-self.size.height);        CGContextDrawImage(effectInContext,imageRect,self.CGImage);                vImage_Buffer effectInBuffer;        effectInBuffer.data     = CGBitmapContextGetData(effectInContext);        effectInBuffer.wIDth    = CGBitmapContextGetWIDth(effectInContext);        effectInBuffer.height   = CGBitmapContextGetHeight(effectInContext);        effectInBuffer.rowBytes = CGBitmapContextGetBytesPerRow(effectInContext);                UIGraphicsBeginImageContextWithOptions(self.size,[[UIScreen mainScreen] scale]);        CGContextRef effectOutContext = UIGraphicsGetCurrentContext();        vImage_Buffer effectOutBuffer;        effectOutBuffer.data     = CGBitmapContextGetData(effectOutContext);        effectOutBuffer.wIDth    = CGBitmapContextGetWIDth(effectOutContext);        effectOutBuffer.height   = CGBitmapContextGetHeight(effectOutContext);        effectOutBuffer.rowBytes = CGBitmapContextGetBytesPerRow(effectOutContext);                if (hasBlur) {            CGfloat inputRadius = blurRadius * [[UIScreen mainScreen] scale];            NSUInteger radius = floor(inputRadius * 3. * sqrt(2 * M_PI) / 4 + 0.5);            if (radius % 2 != 1) {                radius += 1; // force radius to be odd so that the three Box-blur methodology works.            }            vImageBoxConvolve_ARGB8888(&effectInBuffer,&effectOutBuffer,(short)radius,kvImageEdgeExtend);            vImageBoxConvolve_ARGB8888(&effectOutBuffer,&effectInBuffer,kvImageEdgeExtend);            vImageBoxConvolve_ARGB8888(&effectInBuffer,kvImageEdgeExtend);        }        BOol effectimageBuffersAreSwapped = NO;        if (hasSaturationChange) {            CGfloat s = saturationDeltaFactor;            CGfloat floatingPointSaturationMatrix[] = {                0.0722 + 0.9278 * s,0.0722 - 0.0722 * s,0.7152 - 0.7152 * s,0.7152 + 0.2848 * s,0.2126 - 0.2126 * s,0.2126 + 0.7873 * s,1,};            const int32_t divisor = 256;            NSUInteger matrixSize = sizeof(floatingPointSaturationMatrix)/sizeof(floatingPointSaturationMatrix[0]);            int16_t saturationMatrix[matrixSize];            for (NSUInteger i = 0; i < matrixSize; ++i) {                saturationMatrix[i] = (int16_t)roundf(floatingPointSaturationMatrix[i] * divisor);            }            if (hasBlur) {                vImageMatrixMultiply_ARGB8888(&effectOutBuffer,saturationMatrix,divisor,kvImageNoFlags);                effectimageBuffersAreSwapped = YES;            }            else {                vImageMatrixMultiply_ARGB8888(&effectInBuffer,kvImageNoFlags);            }        }        if (!effectimageBuffersAreSwapped)            effectimage = UIGraphicsGetimageFromCurrentimageContext();        UIGraphicsEndImageContext();                if (effectimageBuffersAreSwapped)            effectimage = UIGraphicsGetimageFromCurrentimageContext();        UIGraphicsEndImageContext();    }        // 开启上下文 用于输出图像    UIGraphicsBeginImageContextWithOptions(self.size,[[UIScreen mainScreen] scale]);    CGContextRef outputContext = UIGraphicsGetCurrentContext();    CGContextScaleCTM(outputContext,-1.0);    CGContextTranslateCTM(outputContext,-self.size.height);        // 开始画底图    CGContextDrawImage(outputContext,self.CGImage);        // 开始画模糊效果    if (hasBlur) {        CGContextSaveGState(outputContext);        if (maskImage) {            CGContextClipToMask(outputContext,maskImage.CGImage);        }        CGContextDrawImage(outputContext,effectimage.CGImage);        CGContextRestoreGState(outputContext);    }        // 添加颜色渲染    if (tintcolor) {        CGContextSaveGState(outputContext);        CGContextSetFillcolorWithcolor(outputContext,tintcolor.CGcolor);        CGContextFillRect(outputContext,imageRect);        CGContextRestoreGState(outputContext);    }        // 输出成品,并关闭上下文    UIImage *outputimage = UIGraphicsGetimageFromCurrentimageContext();    UIGraphicsEndImageContext();        return outputimage;}

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