IOS Core Image之一

+ (CIImage *)imageWithCGImage:(CGImageRef)image;
+ (CIImage *)imageWithCGLayer:(CGLayerRef)layer;
+ (nullable CIImage *)imageWithContentsOfURL:(NSURL *)url;
+ (nullable CIImage *)imageWithData:(NSData *)data;
- (instancetype)initWithCGImage:(CGImageRef)image;
- (nullable instancetype)initWithData:(NSData *)data;
- (nullable instancetype)initWithContentsOfURL:(NSURL *)url;
- (instancetype)initWithColor:(CIColor *)color;

 CIContext *context=[CIContext contextWithOptions:nil];

- (void)drawImage:(CIImage *)image
          atPoint:(CGPoint)atPoint
         fromRect:(CGRect)fromRect NS_DEPRECATED(10_4,10_8, 5_0,6_0);

/* Render the rectangle ‘fromRect‘ of ‘image‘ to the rectangle ‘inRect‘ in the
 * context‘s destination. */
- (void)drawImage:(CIImage *)image
           inRect:(CGRect)inRect
         fromRect:(CGRect)fromRect;

/* Render the region ‘fromRect‘ of image ‘image‘ into a temporary buffer using
 * the context, then create and return a new CoreGraphics image with
 * the results. The caller is responsible for releasing the returned
 * image. */
- (CGImageRef)createCGImage:(CIImage *)image
                   fromRect:(CGRect)fromRect
CF_RETURNS_RETAINED;

/* Create a new CGImage from the specified subrect of the image. If
 * non-nil the new image will be created in the specified format and
 * colorspace. */
- (CGImageRef)createCGImage:(CIImage *)image
                   fromRect:(CGRect)fromRect
                     format:(CIFormat)format
                 colorSpace:(nullable CGColorSpaceRef)colorSpace

+ (nullable CIFilter *) filterWithName:(NSString *) name;

/** Creates a new filter of type ‘name‘.
 The filter‘s input parameters are set from the list of key-value pairs which must be nil-terminated.
 On OSX, any of the filter input parameters not specified in the list will be undefined.
 On iOS, any of the filter input parameters not specified in the list will be set to default values. */
+ (nullable CIFilter *)filterWithName:(NSString *)name
                        keysAndValues:key0, ... NS_REQUIRES_NIL_TERMINATION NS_SWIFT_UNAVAILABLE("");

/** Creates a new filter of type ‘name‘.
 The filter‘s input parameters are set from the dictionary of key-value pairs.
 On OSX, any of the filter input parameters not specified in the dictionary will be undefined.
 On iOS, any of the filter input parameters not specified in the dictionary will be set to default values. */
+ (nullable CIFilter *)filterWithName:(NSString *)name
                  withInputParameters:(nullable CI_DICTIONARY(NSString*,id) *)params NS_AVAILABLE(10_10, 8_0);

CIFilter *filter = [CIFilter filterWithName:@"CIGaussianBlur"];
    NSLog(@"%@",filter.attributes);

2015-11-10 16:15:46.697 CoreImage[22672:246714] {
    "CIAttributeFilterAvailable_Mac" = "10.4";
    "CIAttributeFilterAvailable_iOS" = 6;
    CIAttributeFilterCategories =     (
        CICategoryBlur,
        CICategoryStillImage,
        CICategoryVideo,
        CICategoryBuiltIn
    );
    CIAttributeFilterDisplayName = "Gaussian Blur";
    CIAttributeFilterName = CIGaussianBlur;
    CIAttributeReferenceDocumentation = "http://developer.apple.com/cgi-bin/apple_ref.cgi?apple_ref=//apple_ref/doc/filter/ci/CIGaussianBlur";
    inputImage =     {
        CIAttributeClass = CIImage;
        CIAttributeDescription = "The image to use as an input image. For filters that also use a background image, this is the foreground image.";
        CIAttributeDisplayName = Image;
        CIAttributeType = CIAttributeTypeImage;
    };
    inputRadius =     {
        CIAttributeClass = NSNumber;
        CIAttributeDefault = 10;
        CIAttributeDescription = "The radius determines how many pixels are used to create the blur. The larger the radius, the blurrier the result.";
        CIAttributeDisplayName = Radius;
        CIAttributeIdentity = 0;
        CIAttributeMin = 0;
        CIAttributeSliderMax = 100;
        CIAttributeSliderMin = 0;
        CIAttributeType = CIAttributeTypeScalar;
    };
}

/** Returns an array containing all published filter names in a category. */
+ (CI_ARRAY(NSString*) *)filterNamesInCategory:(nullable NSString *)category;

/** Returns an array containing all published filter names that belong to all listed categories. */
+ (CI_ARRAY(NSString*) *)filterNamesInCategories:(nullable CI_ARRAY(NSString*) *)categories;

 //和UIButton类似 通过简单参数确定CIFilter子类  简单工厂
    CIFilter *filter = [CIFilter filterWithName:@"CIAffineTransform"];
    //  NSLog(@"%@",filter.attributes);
    //将图片输入到滤镜中，打个比方：滤镜是个具有某个功能的容器，任何东西放进去，拿出来的时候就会附上效果。 KVC
    [filter setValue:ciimage forKey:@"inputImage"];
    [filter setValue: [NSValue valueWithCGAffineTransform:CGAffineTransformMakeRotation(30)] forKey:@"inputTransform"];

//从滤镜容器中取出图片  这里还有一种输出方式：使用CIcontext  不知道这两种有什么优缺点，欢迎留言
    //CIImage *new = [filter valueForKey:kCIOutputImageKey];
    CIImage *outputImage = filter.outputImage;
    
    UIImageView *img = [[UIImageView alloc] initWithFrame:self.view.frame];
    img.image = [UIImage imageWithCIImage:outputImage];
    //img.image=[UIImage imageWithCIImage:outputImage scale:30 orientation:UIImageOrientationDown];
    [self.view addSubview:img];

 //CIImage *new = [filter valueForKey:kCIOutputImageKey];
    CIImage *outputImage = filter.outputImage;
    
    CIContext *context=[CIContext contextWithOptions:nil];
    CGImageRef cgimg =[context createCGImage:outputImage fromRect:[outputImage extent]];

    UIImageView *img = [[UIImageView alloc] initWithFrame:self.view.frame];
    img.image=[UIImage imageWithCGImage:cgimg];
    [self.view addSubview:img];
    CGImageRelease(cgimg);

//
//  ViewController.m
//  CoreImage
//
//  Created by City--Online on 15/11/10.
//  Copyright © 2015年 City--Online. All rights reserved.
//

#import "ViewController.h"
#import <CoreImage/CoreImage.h>

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    CIImage *inputImg = [[CIImage alloc]initWithCGImage:[UIImage imageNamed:@"1.jpg"].CGImage];
    
    //和UIButton类似 通过简单参数确定CIFilter子类  简单工厂
    CIFilter *filter = [CIFilter filterWithName:@"CIAffineTransform"];
    
    //输出属性
    NSLog(@"%@",filter.attributes);
    
    //将图片输入到滤镜中，打个比方：滤镜是个具有某个功能的容器，任何东西放进去，拿出来的时候就会附上效果。 KVC
    [filter setValue:inputImg forKey:@"inputImage"];
    [filter setValue: [NSValue valueWithCGAffineTransform:CGAffineTransformMakeRotation(30)] forKey:@"inputTransform"];

    //从滤镜容器中取出图片  这里还有一种输出方式：使用CIcontext  不知道这两种有什么优缺点，欢迎留言
    //CIImage *new = [filter valueForKey:kCIOutputImageKey];
    CIImage *outputImage = filter.outputImage;
    
    //通过CIContext上下文 、imageWithCGImage输出滤镜
    CIContext *context=[CIContext contextWithOptions:nil];
    CGImageRef cgimg =[context createCGImage:outputImage fromRect:[outputImage extent]];

    UIImageView *img = [[UIImageView alloc] initWithFrame:self.view.frame];
    img.image=[UIImage imageWithCGImage:cgimg];
    [self.view addSubview:img];
    CGImageRelease(cgimg);

    //遍历每种滤镜下的滤镜名
    NSLog(@"%@",[CIFilter filterNamesInCategories:@[@"CICategoryBlur"]]);
    NSLog(@"%@",[CIFilter filterNamesInCategories:@[@"CICategoryVideo"]]);
    NSLog(@"%@",[CIFilter filterNamesInCategories:@[@"CICategoryStillImage"]]);
    NSLog(@"%@",[CIFilter filterNamesInCategories:@[@"CICategoryBuiltIn"]]);
    
   
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end