//

//  ViewController.m

//  CIGlass

//

//  Created by XianMingYou on 15/3/15.

//  Copyright (c) 2015年 XianMingYou. All rights reserved.

//

#import "ViewController.h"

@interface ViewController ()

@property (nonatomic, strong) UIImage *orgImage;

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // 设置背景色

    self.view.backgroundColor = [UIColor blackColor];

    self.orgImage = [UIImage imageNamed:@"bg.png"];

    // 数据源 + 设置

    CIImage *ciImage = [[CIImage alloc] initWithImage:self.orgImage];

    NSDictionary *params = @{

                             kCIInputImageKey: ciImage,

                             };

    // 初始化滤镜

    CIFilter *filter = [CIFilter filterWithName:@"CIGlassDistortion"

                            withInputParameters:params];

    [filter setDefaults];

    // 输入变形参数

    if ([filter respondsToSelector:NSSelectorFromString(@"inputTexture")]) {

        CIImage *ciTextureImage = [[CIImage alloc] initWithImage:[UIImage imageNamed:@"grassdistortion.png"]];

        [filter setValue:ciTextureImage forKey:@"inputTexture"];

    }

    // 创建上下文 + 输出图片

    CIContext *context   = [CIContext contextWithOptions:nil];

    CIImage *outputImage = [filter outputImage];

    // 获取图片

    CGImageRef cgImage   = [context createCGImage:outputImage

                                         fromRect:[outputImage extent]];

    // 获取图片

    UIImage *image = [UIImage imageWithCGImage:cgImage];

    // 释放资源

    CGImageRelease(cgImage);

    // 加载图片

    UIImageView *imageView = [[UIImageView alloc] initWithImage:image];

    imageView.frame        = self.view.bounds;

    [self.view addSubview:imageView];

}

@end