#import "GPUImageFilter.h"
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@interface GPUImageToneCurveFilter : GPUImageFilter
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@property(readwrite, nonatomic, copy) NSArray *redControlPoints;
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@property(readwrite, nonatomic, copy) NSArray *greenControlPoints;
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@property(readwrite, nonatomic, copy) NSArray *blueControlPoints;
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@property(readwrite, nonatomic, copy) NSArray *rgbCompositeControlPoints;
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// Initialization and teardown
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- (id)initWithACVData:(NSData*)data;
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- (id)initWithACV:(NSString*)curveFilename;
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- (id)initWithACVURL:(NSURL*)curveFileURL;
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// This lets you set all three red, green, and blue tone curves at once.
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// NOTE: Deprecated this function because this effect can be accomplished
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// using the rgbComposite channel rather then setting all 3 R, G, and B channels.
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- (void)setRGBControlPoints:(NSArray *)points DEPRECATED_ATTRIBUTE;
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- (void)setPointsWithACV:(NSString*)curveFilename;
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- (void)setPointsWithACVURL:(NSURL*)curveFileURL;
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// Curve calculation
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- (NSMutableArray *)getPreparedSplineCurve:(NSArray *)points;
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- (NSMutableArray *)splineCurve:(NSArray *)points;
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- (NSMutableArray *)secondDerivative:(NSArray *)cgPoints;
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- (void)updateToneCurveTexture;
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@end
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