iOS picture Blur effect

Join Coreimage.framework Coregraphic.framework and other libraries

when used, introduce: #import<Accelerate/Accelerate.h> support for iOS 5.0 and above.

-(void) show

{

UIImage* img = [selfgetblurimage: [UIImageimagenamed:@ " Default-568h.png "];

[_bgimageview setimage: img];

}

-(UIImage*) Getblurimage: (UIImage*) image

{

return [selfgaussblur:0.2andimage: 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));

int boxsize = ; // The degree of ambiguity.

Boxsize = boxsize-(boxsize% 2) + 1;

nsdata *imagedata = uiimagejpegrepresentation(originimage, 1);

UIImage *tmpimage = [UIImageimagewithdata: 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);

nsinteger windowr = boxsize/2;

cgfloat sig2 = WINDOWR/ 3.0;

if (windowr>0) {sig2 =-1/(2*sig2*sig2);}

int16_t *kernel = (int16_t*)malloc(boxsize*sizeof(int16_t));

int32_t sum = 0;

for (nsinteger i=0; i<boxsize; ++i) {

Kernel[i] = 255*exp(sig2* (I-WINDOWR) * (I-WINDOWR));

Sum + = Kernel[i];

}

Free (kernel);

//convolution

Error = vimageconvolve_argb8888(&inbuffer, &outbuffer,NULL, 0, 0, kernel , Boxsize, 1, sum, NULL, kvimageedgeextend);

Error = vimageconvolve_argb8888(&outbuffer, &inbuffer,NULL, 0, 0, Kernel, 1, 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,

8,

Outbuffer. Rowbytes,

ColorSpace,

kcgbitmapalphainfomask &kcgimagealphanoneskiplast);

cgimageref imageref =cgbitmapcontextcreateimage(CTX);

UIImage *returnimage = [UIImageimagewithcgimage: Imageref];

//clean up

cgcontextrelease(CTX);

cgcolorspacerelease(colorspace);

Free (Pixelbuffer);

Cfrelease (Inbitmapdata);

Cgimagerelease (IMAGEREF);

return returnimage;

}