UIImage fuzzy processing (frosted glass)

+ (UIImage *) Accelerateblurwithimage: (UIImage *) image

{

if (image==nil)

{

NSLog(@ "error: failed to get original image when adding blur effect to picture ");

return nil;

}

// blur degree ,

if ((Blur < 0.1f) | | (Blur > 2.0f)) {

Blur = 0.5f;

//    }

//boxsize must be greater than 0

int boxsize = (int) ( 5);

Boxsize-= (boxsize% 2) + 1;

NSLog(@ "boxsize:%i", boxsize);

// image processing

cgimageref img = image. Cgimage;

// need to introduce #import <Accelerate/Accelerate.h>

/*

This document describes the accelerate Framework, which contains C APIs for vector and matrix math, digital signal process ING, large number handling, and image processing.

This document describes the accelerate Framework, which contains vector and matrix math for C language application interfaces (APIs), digital signal processing, mass processing, and image processing.

*/

// image cache , input cache, output cache

vimage_buffer inbuffer, outbuffer;

vimage_error Error;

// pixel cache

void *pixelbuffer;

// data source provider,defines an opaque type this supplies Quartz with data.

cgdataproviderref inprovider = cgimagegetdataprovider(IMG);

//Provider ' s data.

cfdataref inbitmapdata = cgdataprovidercopydata(inprovider);

// width, height, byte / line,data

Inbuffer. width = cgimagegetwidth(IMG);

Inbuffer. height = cgimagegetheight(IMG);

Inbuffer. rowbytes = cgimagegetbytesperrow(IMG);

Inbuffer. Data = (void*)cfdatagetbyteptr(inbitmapdata);

//Image cache, byte line * picture high

Pixelbuffer = malloc(cgimagegetbytesperrow(IMG) * cgimagegetheight(img));

Outbuffer. data = pixelbuffer;

Outbuffer. width = cgimagegetwidth(IMG);

Outbuffer. height = cgimagegetheight(IMG);

Outbuffer. rowbytes = cgimagegetbytesperrow(IMG);

// Third middle buffer , anti-aliasing effect

void *pixelbuffer2 = malloc(cgimagegetbytesperrow(IMG) * cgimagegetheight(img));

vimage_buffer outBuffer2;

OutBuffer2. data = pixelBuffer2;

OutBuffer2. width = cgimagegetwidth(IMG);

OutBuffer2. height = cgimagegetheight(IMG);

OutBuffer2. rowbytes = cgimagegetbytesperrow(IMG);

//convolves a region of interest within an ARGB8888 source image by an implicit M x N kernel that have the effect of a Box filter.

Error = vimageboxconvolve_argb8888(&inbuffer, &outbuffer2, NULL, 0, 0, Boxsize, Boxsize, NULL, kvimageedgeextend);

Error = vimageboxconvolve_argb8888(&inbuffer, &outbuffer2, NULL, 0, 0 , Boxsize, Boxsize, NULL, kvimageedgeextend);

Error = vimageboxconvolve_argb8888(&inbuffer, &outbuffer, NULL, 0, 0, Boxsize , Boxsize, NULL, kvimageedgeextend);

if (error) {

NSLog(@ "error from convolution%ld", error);

}

//NSLog (@ " byte component:%zu", Cgimagegetbitspercomponent (IMG));

// color space devicergb

cgcolorspaceref colorspace = Cgcolorspacecreatedevicergb();

// Create context with picture , Cgimagegetbitspercomponent (IMG), 7,8

cgcontextref ctx = cgbitmapcontextcreate(

Outbuffer. data,

Outbuffer. width,

Outbuffer. height,

8,

Outbuffer. rowbytes,

ColorSpace,

cgimagegetbitmapinfo(image. Cgimage));

// based on context, processed pictures, re-assembly

cgimageref imageref = cgbitmapcontextcreateimage (CTX);

UIImage *returnimage = [UIImage imagewithcgimage: imageref];

//clean up

cgcontextrelease(CTX);

cgcolorspacerelease(colorspace);

free(pixelbuffer);

free(pixelBuffer2);

cfrelease(inbitmapdata);

//cgcolorspacerelease (colorspace); extra release.

cgimagerelease(imageref);

return returnimage;

}

UIImage fuzzy processing (frosted glass)