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iOS CoreImage图片处理动态渲染(滤镜)
//
// ViewController.m
// CoreImageOfDong
//
// Created by Dong on 15/6/30.
// Copyright (c) 2015年 xindong. All rights reserved.
//
#import "ViewController.h"
#import <GLKit/GLKit.h> // 须要导入此库
@interface ViewController ()
@property (nonatomic, strong) GLKView *glkView; //渲染用的buffer视图(类似流媒体,实时改变)
@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);
// 获取OpenGLES渲染的上下文
EAGLContext *eagContext = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
// 创建出渲染的buffer
self.glkView = [[GLKView alloc] initWithFrame:rect context:eagContext];
[self.glkView bindDrawable]; // 绑定绘制,否则刚開始会黑屏
[self.view addSubview:self.glkView];
// 创建出CoreImage用的上下文
self.ciContext = [CIContext contextWithEAGLContext:eagContext options:@{kCIContextWorkingColorSpace : [NSNull null]}];
// CoreImage相关设置
self.ciImage = [[CIImage alloc] initWithImage:showImage];
self.filter = [CIFilter filterWithName:@"CISepiaTone"];
[self.filter setValue:self.ciImage forKey:kCIInputImageKey];
[self.filter setValue:@(0) forKey:kCIInputIntensityKey];
// 開始渲染
[self.ciContext drawImage:[self.filter valueForKey:kCIOutputImageKey] inRect:CGRectMake(0, 0, self.glkView.drawableWidth, self.glkView.drawableHeight) fromRect:[self.ciImage extent]];
[self.glkView display];
// 动态渲染
UISlider *slider = [[UISlider alloc] initWithFrame:CGRectMake(30, 500, 200, 10)];
slider.minimumValue = http://www.mamicode.com/0.f;
slider.maximumValue = http://www.mamicode.com/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];
// 開始渲染
[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图片处理动态渲染(滤镜)