IOS coreimage Picture processing dynamic Rendering (filters)

//

Viewcontroller.m

Coreimageofdong

//

Created by 15/6/30.

Copyright (c) year Xindong. All rights reserved.

//

#import "ViewController.h"

#import <GLKit/GLKit.h>// need to import this library

@interface Viewcontroller ()

@ Property ( nonatomic strong ) Span style= "font-size:14px" >glkview *glkview; // buffer view ( similar to streaming Real-time change )

@property (nonatomic, strong) Cifilter *filter;

@property (nonatomic, strong) Ciimage *ciimage;

@property (nonatomic, strong) Cicontext *cicontext;

@end

@implementation Viewcontroller

-(void) Viewdidload {

[Super Viewdidload];

        

UIImage *showimage = [UIImage imagenamed:@ "demo1.jpg"];

CGRect rect = CGRectMake (0, 0, showImage.size.width, showImage.size.height);

// get context of opengles rendering

Eaglcontext *eagcontext = [[Eaglcontext alloc] initwithapi:keaglrenderingapiopengles2];

// Create a rendered buffer

Self.glkview = [[Glkview alloc] Initwithframe:rect Context:eagcontext];

[Self.glkview binddrawable]; // bind draw , otherwise it will start black screen

[Self.view AddSubview:self.glkView];

// Create a context for Coreimage

Self.cicontext = [Cicontext contextwitheaglcontext:eagcontext options:@{kcicontextworkingcolorspace: [NSNull NULL]}] ;

//Coreimage Related Settings

Self.ciimage = [[Ciimage alloc] initwithimage:showimage];

Self.filter = [Cifilter filterwithname:@ "Cisepiatone"];

[Self.filter setValue:self.ciImage Forkey:kciinputimagekey];

[Self.filter setvalue:@ (0) Forkey:kciinputintensitykey];

// start rendering

[Self.cicontext drawimage:[self.filter Valueforkey:kcioutputimagekey] Inrect:cgrectmake (0, 0, Self.glkView.drawableWidth, Self.glkView.drawableHeight) fromrect:[self.ciimage extent]];

[Self.glkview display];

// dynamic rendering

UISlider *slider = [[UISlider alloc] Initwithframe:cgrectmake (30, 500, 200, 10)];

Slider.minimumvalue = 0.F;

Slider.maximumvalue = 10.F;

[Slider addtarget:self action: @selector (Changecolorvalue:) forcontrolevents:uicontroleventvaluechanged];

[Self.view Addsubview:slider];

}

-(void) Changecolorvalue: (UISlider *) slider

{

[Self.filter setValue:self.ciImage Forkey:kciinputimagekey];

[Self.filter setvalue:@ (Slider.value) Forkey:kciinputintensitykey];

// start rendering

[Self.cicontext drawimage:[self.filter Valueforkey:kcioutputimagekey] Inrect:cgrectmake (0, 0, Self.glkView.drawableWidth, Self.glkView.drawableHeight) fromrect:[self.ciimage extent]];

[Self.glkview display];

}

IOS coreimage Picture processing dynamic Rendering (filters)