IOS Frosted glass Effect implementation

Add blur effect, image is picture, Blur is blur degree

-(UIImage *) Blurryimage: (UIImage *) image withblurlevel: (CGFloat) Blur {

Fuzziness,

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

Blur = 0.5f;

}

Boxsize must be greater than 0

int boxsize = (int) (blur * 100);

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 the C language application interface (API) for vector and matrix math, 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;

The data source provider, defines an opaque type, the 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);

Like number 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 intermediate 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 (&outbuffer2, &inbuffer, 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);

Cgimagerelease (IMAGEREF);

return returnimage;

}

IOS Frosted glass Effect implementation