CIFilter+Additions.m

/*
 
 @file CIFilter+Additions.m
 
 @abstract Adds additional functionality to CIFilter.
 
 @version 1.1
 
 ©  Copyright 2006-2009 Apple, Inc. All rights reserved.
 
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 */

#import "CIFilter+Additions.h"


@implementation CIFilter ( MinMaxBindings )

- (id)valueForKeyPath:(NSString *)keyPath
{
	if ((keyPath != nil) && ([keyPath length] > 1) && ([keyPath characterAtIndex:0] == (unichar) '@'))
	{
		NSRange const dotRange = [keyPath rangeOfString:@"."];
		NSString *operator = (dotRange.location == NSNotFound) ? keyPath : [keyPath substringToIndex:dotRange.location];
		NSString *remainderPath = ((dotRange.location == NSNotFound) || (dotRange.location == [keyPath length])) ? nil : [keyPath substringFromIndex:(dotRange.location + 1)];
		if ((remainderPath != nil) &&
			([operator isEqualToString:@"@minSlider"] || [operator isEqualToString:@"@maxSlider"]))
		{
			BOOL const minimum = [operator isEqualToString:@"@minSlider"];
			NSDictionary *attributes = [self attributes];
			NSDictionary *attributeDictionary = [attributes objectForKey:remainderPath];
			if (attributeDictionary != nil)
			{
				NSObject *value = [attributeDictionary objectForKey:(minimum ? kCIAttributeSliderMin : kCIAttributeSliderMax)];
				if (value == nil)
				{
					value = [attributeDictionary objectForKey:(minimum ? kCIAttributeMin : kCIAttributeMax)];
				}
				return value;
			}
		}
	}
	return [super valueForKeyPath:keyPath];
}

@end

@implementation CIFilter ( DisplayName )

- (NSString *)displayName
{
	NSString *displayName = [[self attributes] objectForKey:kCIAttributeFilterDisplayName];
	if (displayName == nil)
		displayName = [[self attributes] objectForKey:kCIAttributeFilterName];
	return displayName;
}

@end

@implementation CIFilter ( Stacking )

- (NSArray *)allImageInputKeys
{
    NSMutableArray *imageKeys = [NSMutableArray array];
    NSDictionary *attributes = [self attributes];
    for (NSString *name in [self inputKeys])
    {
        NSDictionary *attribteDescription = [attributes objectForKey:name];
		NSString *className = [attribteDescription objectForKey:kCIAttributeClass];
        if ([className isEqualToString:@"CIImage"])
            [imageKeys addObject:name];
    }
    return imageKeys;
}

- (void)bindImageInputsToFilter:(CIFilter *)inputFilter
{
	NSArray *inputs = [self allImageInputKeys];
	for (NSString *inputKey in inputs)
	{
		[self bind:inputKey toObject:inputFilter withKeyPath:kCIOutputImageKey options:nil];
	}
	
}

- (void)unbindImageInputs
{
	NSArray *inputs = [self allImageInputKeys];
	for (NSString *inputKey in inputs)
	{
		[self unbind:inputKey];
	}
}

@end