UIImage高斯模糊

来源：互联网发布：土方工程量计算软件编辑：程序博客网时间：2024/06/03 12:29
- (UIImage *)blurryImage:(UIImage *)image withBlurLevel:(CGFloat)blur{    if (!image) {        return nil;    }    if (blur < 0.f || blur > 1.f) {        blur = 0.3f;    }    int boxSize = (int)(blur * 5);    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获取对象的属性    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;}
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