iOS CoreImage第二章—— CIFilter滤镜（CIFilter 、CIFilterConstructor、CIFilterShape、CIRAWFilter）

相关类有CIFilter 、CIFilterConstructor、CIFilterShape、CIRAWFilter

//文档地址(各种效果解释的很清楚)：https://developer.apple.com/library/archive/documentation/GraphicsImaging/Reference/CoreImageFilterReference/index.html#//apple_ref/doc/uid/TP30000136-SW29
/* Categories */
CORE_IMAGE_EXPORT NSString * const kCICategoryDistortionEffect;
CORE_IMAGE_EXPORT NSString * const kCICategoryGeometryAdjustment;
CORE_IMAGE_EXPORT NSString * const kCICategoryCompositeOperation;
CORE_IMAGE_EXPORT NSString * const kCICategoryHalftoneEffect;
CORE_IMAGE_EXPORT NSString * const kCICategoryColorAdjustment;
CORE_IMAGE_EXPORT NSString * const kCICategoryColorEffect;
CORE_IMAGE_EXPORT NSString * const kCICategoryTransition;
CORE_IMAGE_EXPORT NSString * const kCICategoryTileEffect;
CORE_IMAGE_EXPORT NSString * const kCICategoryGenerator;
CORE_IMAGE_EXPORT NSString * const kCICategoryReduction NS_AVAILABLE(10_5, 5_0);
CORE_IMAGE_EXPORT NSString * const kCICategoryGradient;
CORE_IMAGE_EXPORT NSString * const kCICategoryStylize;
CORE_IMAGE_EXPORT NSString * const kCICategorySharpen;
CORE_IMAGE_EXPORT NSString * const kCICategoryBlur;
CORE_IMAGE_EXPORT NSString * const kCICategoryVideo;
CORE_IMAGE_EXPORT NSString * const kCICategoryStillImage;
CORE_IMAGE_EXPORT NSString * const kCICategoryInterlaced;
CORE_IMAGE_EXPORT NSString * const kCICategoryNonSquarePixels;
CORE_IMAGE_EXPORT NSString * const kCICategoryHighDynamicRange;
CORE_IMAGE_EXPORT NSString * const kCICategoryBuiltIn;
CORE_IMAGE_EXPORT NSString * const kCICategoryFilterGenerator NS_AVAILABLE(10_5, 9_0);

//通过下面的方法获取滤镜数组
+ (NSArray<NSString *> *)filterNamesInCategory:(nullable NSString *)category;
+ (NSArray<NSString *> *)filterNamesInCategories:(nullable NSArray<NSString *> *)categories;

//通过下面的方法传入滤镜名字创建一个filter
+ (nullable CIFilter *) filterWithName:(NSString *) name;
+ (nullable CIFilter *)filterWithName:(NSString *)name
                        keysAndValues:key0, ... ;
+ (nullable CIFilter *)filterWithName:(NSString *)name
                  withInputParameters:(nullable NSDictionary<NSString *,id> *)params NS_AVAILABLE(10_10, 8_0);

// 传入一个滤镜名 返回 对该滤镜的本地化名称
+ (nullable NSString *)localizedNameForFilterName:(NSString *)filterName NS_AVAILABLE(10_4, 9_0);

// 传入滤镜类别 返回 该类别 本地化名称
+ (NSString *)localizedNameForCategory:(NSString *)category NS_AVAILABLE(10_4, 9_0);

// 传入一个滤镜名 返回 对该滤镜的描述
+ (nullable NSString *)localizedDescriptionForFilterName:(NSString *)filterName NS_AVAILABLE(10_4, 9_0);

// 返回滤镜的文档地址
+ (nullable NSURL *)localizedReferenceDocumentationForFilterName:(NSString *)filterName NS_AVAILABLE(10_4, 9_0);

//以下key 用来配置filter

用法如：
    CIFilter *filter = [CIFilter filterWithName:@"CILanczosScaleTransform"];
    [filter setValue:iimage forKey:kCIInputImageKey];
    [filter setValue:[NSNumber numberWithFloat:0.3] forKey:kCIInputScaleKey];
    CIImage *immmm = [filter valueForKey:kCIOutputImageKey];
    [filter setDefaults];//恢复默认

CORE_IMAGE_EXPORT NSString * const kCIOutputImageKey NS_AVAILABLE(10_5, 5_0);
CORE_IMAGE_EXPORT NSString * const kCIInputBackgroundImageKey NS_AVAILABLE(10_5, 5_0);
CORE_IMAGE_EXPORT NSString * const kCIInputImageKey NS_AVAILABLE(10_5, 5_0);
CORE_IMAGE_EXPORT NSString * const kCIInputDepthImageKey NS_AVAILABLE(10_13, 11_0);
CORE_IMAGE_EXPORT NSString * const kCIInputDisparityImageKey NS_AVAILABLE(10_13, 11_0);
CORE_IMAGE_EXPORT NSString * const kCIInputTimeKey NS_AVAILABLE(10_5, 7_0);
CORE_IMAGE_EXPORT NSString * const kCIInputTransformKey NS_AVAILABLE(10_5, 7_0);
CORE_IMAGE_EXPORT NSString * const kCIInputScaleKey NS_AVAILABLE(10_5, 7_0);
CORE_IMAGE_EXPORT NSString * const kCIInputAspectRatioKey NS_AVAILABLE(10_5, 7_0);
CORE_IMAGE_EXPORT NSString * const kCIInputCenterKey NS_AVAILABLE(10_5, 7_0);
CORE_IMAGE_EXPORT NSString * const kCIInputRadiusKey NS_AVAILABLE(10_5, 7_0);
CORE_IMAGE_EXPORT NSString * const kCIInputAngleKey NS_AVAILABLE(10_5, 7_0);
CORE_IMAGE_EXPORT NSString * const kCIInputRefractionKey NS_AVAILABLE(10_5, 9_0);
CORE_IMAGE_EXPORT NSString * const kCIInputWidthKey NS_AVAILABLE(10_5, 7_0);
CORE_IMAGE_EXPORT NSString * const kCIInputSharpnessKey NS_AVAILABLE(10_5, 7_0);
CORE_IMAGE_EXPORT NSString * const kCIInputIntensityKey NS_AVAILABLE(10_5, 7_0);
CORE_IMAGE_EXPORT NSString * const kCIInputEVKey NS_AVAILABLE(10_5, 7_0);
CORE_IMAGE_EXPORT NSString * const kCIInputSaturationKey NS_AVAILABLE(10_5, 7_0);
CORE_IMAGE_EXPORT NSString * const kCIInputColorKey NS_AVAILABLE(10_5, 7_0);
CORE_IMAGE_EXPORT NSString * const kCIInputBrightnessKey NS_AVAILABLE(10_5, 7_0);
CORE_IMAGE_EXPORT NSString * const kCIInputContrastKey NS_AVAILABLE(10_5, 7_0);
CORE_IMAGE_EXPORT NSString * const kCIInputBiasKey NS_AVAILABLE(10_5, 9_0);
CORE_IMAGE_EXPORT NSString * const kCIInputWeightsKey NS_AVAILABLE(10_11, 9_0);
CORE_IMAGE_EXPORT NSString * const kCIInputGradientImageKey NS_AVAILABLE(10_5, 9_0);
CORE_IMAGE_EXPORT NSString * const kCIInputMaskImageKey NS_AVAILABLE(10_5, 7_0);
CORE_IMAGE_EXPORT NSString * const kCIInputShadingImageKey NS_AVAILABLE(10_5, 9_0);
CORE_IMAGE_EXPORT NSString * const kCIInputTargetImageKey NS_AVAILABLE(10_5, 7_0);
CORE_IMAGE_EXPORT NSString * const kCIInputExtentKey NS_AVAILABLE(10_5, 7_0);
CORE_IMAGE_EXPORT NSString * const kCIInputVersionKey NS_AVAILABLE(10_11, 6_0);

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