iOS画面模糊
增加 CoreImage.framework CoreGraphic.framework 等库
在使用时引入:#import
<Accelerate/Accelerate.h> ,支持iOS 5.0 及以上。
-(void)show
{
UIImage* img = [self
getBlurImage:[UIImage
imageNamed:@"Default-568h.png"]];
[_bgImageView
setImage:img];
}
-(UIImage*)getBlurImage:(UIImage*)image
{
return [self
gaussBlur:0.2
andImage:image];
}
- (UIImage*)gaussBlur:(CGFloat)blurLevel andImage:(UIImage*)originImage
{
blurLevel = MIN(1.0,
MAX(0.0, blurLevel));
//int boxSize = (int)(blurLevel * 0.1 * MIN(self.size.width, self.size.height));
;//模糊度。
boxSize = boxSize - (boxSize % ) + ;
NSData *imageData =
UIImageJPEGRepresentation(originImage, );
UIImage *tmpImage = [UIImage
imageWithData:imageData];
CGImageRef img = tmpImage.CGImage;
vImage_Buffer inBuffer, outBuffer;
vImage_Error error;
void *pixelBuffer;
//create vImage_Buffer with data from CGImageRef
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);
//create vImage_Buffer for output
pixelBuffer = malloc(CGImageGetBytesPerRow(img) *
CGImageGetHeight(img));
outBuffer.data = pixelBuffer;
outBuffer.width =
CGImageGetWidth(img);
outBuffer.height =
CGImageGetHeight(img);
outBuffer.rowBytes =
CGImageGetBytesPerRow(img);
;
CGFloat sig2 = windowR /
3.0;
){ sig2 = -/(*sig2*sig2); }
int16_t *kernel = (int16_t*)malloc(boxSize*sizeof(int16_t));
;
; i<boxSize; ++i){
kernel[i] = *exp(sig2*(i-windowR)*(i-windowR));
sum += kernel[i];
}
free(kernel);
// convolution
error = vImageConvolve_ARGB8888(&inBuffer, &outBuffer,
, , kernel, boxSize, , sum,
NULL, kvImageEdgeExtend);
error = vImageConvolve_ARGB8888(&outBuffer, &inBuffer,
, , kernel, , boxSize, sum,
NULL, kvImageEdgeExtend);
outBuffer = inBuffer;
if (error) {
//NSLog(@"error from convolution %ld", error);
}
CGColorSpaceRef colorSpace =
CGColorSpaceCreateDeviceRGB();
CGContextRef ctx =
CGBitmapContextCreate(outBuffer.data,
outBuffer.width,
outBuffer.height,
,
outBuffer.rowBytes,
colorSpace,
kCGBitmapAlphaInfoMask &
kCGImageAlphaNoneSkipLast);
CGImageRef imageRef =
CGBitmapContextCreateImage(ctx);
UIImage *returnImage = [UIImage
imageWithCGImage:imageRef];
//clean up
CGContextRelease(ctx);
CGColorSpaceRelease(colorSpace);
free(pixelBuffer);
CFRelease(inBitmapData);
CGImageRelease(imageRef);
return returnImage;
}
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