CIFunHouse/CIFilter+FHAdditions.m
/* |
File: CIFilter+FHAdditions.m |
Abstract: CIFilter category for accessing CIImage input attributes. |
Version: 1.0 |
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*/ |
#import "CIFilter+FHAdditions.h" |
#import <objc/runtime.h> |
#import "FilterStack.h" |
@implementation CIFilter (FunHouseAdditions) |
- (NSArray *)imageInputAttributeKeys |
{ |
// cache the enumerated image input attributes |
static const char *associationKey = "_storedImageInputAttributeKeys"; |
NSArray *attributes = (NSArray *)objc_getAssociatedObject(self, associationKey); |
if (!attributes) |
{ |
NSMutableArray *addingArray = [NSMutableArray array]; |
for (NSString *key in self.inputKeys) |
{ |
NSDictionary *attrDict = [self.attributes objectForKey:key]; |
if ([[attrDict objectForKey:kCIAttributeType] isEqualToString:kCIAttributeTypeImage]) |
[addingArray addObject:key]; |
} |
attributes = [addingArray copy]; |
objc_setAssociatedObject(self, associationKey, attributes, OBJC_ASSOCIATION_RETAIN_NONATOMIC); |
} |
return attributes; |
} |
- (NSUInteger)imageInputCount |
{ |
return self.imageInputAttributeKeys.count; |
} |
- (BOOL)onlyRequiresInputImages |
{ |
return self.imageInputCount == self.inputKeys.count; |
} |
- (BOOL)isUsableFilter |
{ |
// for now only CIColorCube is not usable |
return ![[self name] isEqualToString:@"CIColorCube"]; |
} |
- (BOOL)isSourceFilter |
{ |
return [self isKindOfClass:[SourceFilter class]]; |
} |
+ (BOOL)isAttributeConfigurable:(NSDictionary *)filterAttributeDictionary |
{ |
static NSArray *names = nil; |
@synchronized(self) |
{ |
if (!names) |
names = @[ @"CIColor", @"CIVector", @"NSNumber" ]; |
} |
if ([names containsObject:[filterAttributeDictionary objectForKey:kCIAttributeClass]]) |
return YES; |
NSString *attrType = [filterAttributeDictionary objectForKey:kCIAttributeType]; |
if ([attrType isEqualToString:kCIAttributeTypeTransform]) |
return YES; |
return NO; |
} |
@end |
NSString *CIFilterGetShortenedInputAttributeName (NSString *name) |
{ |
return [name hasPrefix:@"input"] ? [name substringFromIndex:5] : name; |
} |
BOOL CIFilterIsValueOfTypeCGAffineTransform (id value) |
{ |
return [value isKindOfClass:[NSValue class]] && !strcmp([value objCType], @encode(CGAffineTransform)); |
} |
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