//

//  ViewController.m

//  图片模糊处理

//

//  Created by wusiping on 16/1/28.

//  Copyright © 2016年 wusiping. All rights reserved.

//

#import "ViewController.h"

#import <AssetsLibrary/AssetsLibrary.h>

@interface ViewController ()<UINavigationControllerDelegate,UIImagePickerControllerDelegate>

@end

@implementation ViewController{

    CIContext *context;

    CIFilter *filter;

    CIImage *beginImage;

}

- (void)viewDidLoad {

    [super viewDidLoad];

    //取得图片路径

    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"image" ofType:@"png"];

    NSURL *fileNameAndPath = [NSURL fileURLWithPath:filePath];

    //根据路径，创建开始图片

    beginImage = [CIImage imageWithContentsOfURL:fileNameAndPath];

    context = [CIContext contextWithOptions:nil];

    //创建滤镜，和输出图片

    filter = [CIFilter filterWithName:@"CISepiaTone" keysAndValues: kCIInputImageKey, beginImage, @"inputIntensity", @0.8, nil];

    CIImage *outputImage = [filter outputImage];

    //在这里你用上下文对象里的一个方法来画一个CGImage,调用上下文中的createCGImage:fromRect:和提供的CIImage可以生成一个CGImageRef。

    CGImageRef cgimg = [context createCGImage:outputImage fromRect:[outputImage extent]];

    //下面，你用UIImage + imageWithCGImage，从CGImage中创建一个UIImage。

    UIImage *newImage = [UIImage imageWithCGImage:cgimg];

    self.imageView.image = newImage;

    //最后，开放 CGImageRef接口。 CGImage 是一个C接口，即使有ARC，也需要你自己来做内存管理。编译运行，确保正常工作。

    CGImageRelease(cgimg);

    [self logAllFilters];

 }

- (IBAction)amountSliderValueChanged:(id)sender {

    float slideValue = self.amountSlider.value;

    [filter setValue:@(slideValue) forKey:@"inputIntensity"];

    CIImage *outputImage = [filter outputImage];

    CGImageRef cgimg = [context createCGImage:outputImage fromRect:[outputImage extent]];

    UIImage *newImage = [UIImage imageWithCGImage:cgimg];

    self.imageView.image = newImage;

    CGImageRelease(cgimg);

}

- (IBAction)loadPhoto:(id)sender {

    UIImagePickerController *pickerC = [[UIImagePickerController alloc] init];

    pickerC.delegate = self;

    [self presentViewController:pickerC animated:YES completion:nil];

}

- (IBAction)savePhoto:(id)sender {

    CIImage *saveToSave = [filter outputImage];

    CIContext *softwareContext = [CIContext contextWithOptions:@{kCIContextUseSoftwareRenderer : @(YES)} ];

    CGImageRef cgImg = [softwareContext createCGImage:saveToSave fromRect:[saveToSave extent]];

    ALAssetsLibrary* library = [[ALAssetsLibrary alloc] init];

    [library writeImageToSavedPhotosAlbum:cgImg metadata:[saveToSave properties] completionBlock:^(NSURL *assetURL, NSError *error) { CGImageRelease(cgImg); }];

}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

    [self dismissViewControllerAnimated:YES completion:nil];

    UIImage *gotImage = [info objectForKey:UIImagePickerControllerOriginalImage];

    beginImage = [CIImage imageWithCGImage:gotImage.CGImage];

    [filter setValue:beginImage forKey:kCIInputImageKey];

    [self amountSliderValueChanged:self.amountSlider];

}

- (void)imagePickerControllerDidCancel: (UIImagePickerController *)picker {

    [self dismissViewControllerAnimated:YES completion:nil];

}

/**

 *  打印所有滤镜

 */

-(void)logAllFilters {

    NSArray *properties = [CIFilter filterNamesInCategory: kCICategoryBuiltIn];

    NSLog(@"%@", properties);

    for (NSString *filterName in properties){

        CIFilter *fltr = [CIFilter filterWithName:filterName];

        NSLog(@"%@", [fltr attributes]);

    }

}

@end