CIHazeFilterSample/MyHazeFilter.m
/* |
File: MyHazeFilter.m |
Abstract: Custom CIFilter. |
Version: 1.1 |
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*/ |
#import "MyHazeFilter.h" |
@implementation MyHazeFilter |
{ |
CIImage *inputImage; |
CIColor *inputColor; |
NSNumber *inputDistance; |
NSNumber *inputSlope; |
} |
static CIKernel *hazeRemovalKernel = nil; |
+ (void)registerFilter |
{ |
NSArray *filterCategories = @[kCICategoryColorAdjustment, kCICategoryVideo, kCICategoryStillImage, |
kCICategoryInterlaced, kCICategoryNonSquarePixels]; |
NSDictionary *attributes = @{ |
kCIAttributeFilterDisplayName : @"Haze Remover", |
kCIAttributeFilterCategories : filterCategories }; |
[CIFilter registerFilterName:@"MyHazeRemover" constructor:(id <CIFilterConstructor>)self classAttributes:attributes]; |
} |
+ (CIFilter *)filterWithName:(NSString *)name |
{ |
return [[self alloc] init]; |
} |
- (id)init |
{ |
self = [super init]; |
if (self) { |
if (hazeRemovalKernel == nil) |
{ |
// Load the haze removal kernel. |
NSBundle *bundle = [NSBundle bundleForClass: [self class]]; |
NSURL *kernelURL = [bundle URLForResource:@"MyHazeRemoval" withExtension:@"cikernel"]; |
NSError *error; |
NSString *kernelCode = [NSString stringWithContentsOfURL:kernelURL encoding:NSUTF8StringEncoding error:&error]; |
if (kernelCode == nil) { |
NSLog(@"Error loading kernel code string in %@\n%@", NSStringFromSelector(_cmd), [error localizedDescription]); |
abort(); |
} |
NSArray *kernels = [CIKernel kernelsWithString:kernelCode]; |
hazeRemovalKernel = [kernels objectAtIndex:0]; |
} |
} |
return self; |
} |
- (CIImage *)outputImage |
{ |
CISampler *src = [CISampler samplerWithImage: inputImage]; |
return [self apply: hazeRemovalKernel, src, inputColor, inputDistance, |
inputSlope, kCIApplyOptionDefinition, [src definition], nil]; |
} |
- (NSDictionary *)customAttributes |
{ |
NSDictionary *distanceDictionary = @{ |
kCIAttributeMin : @0.0, |
kCIAttributeMax : @1.0, |
kCIAttributeSliderMin : @0.0, |
kCIAttributeSliderMax : @0.7, |
kCIAttributeDefault : @0.2, |
kCIAttributeIdentity : @0.0, |
kCIAttributeType : kCIAttributeTypeScalar }; |
NSDictionary *slopeDictionary = @{ |
kCIAttributeSliderMin : @-0.01, |
kCIAttributeSliderMax : @0.01, |
kCIAttributeDefault : @0.00, |
kCIAttributeIdentity : @0.00, |
kCIAttributeType : kCIAttributeTypeScalar |
}; |
NSDictionary *colorDictionary = @{ |
kCIAttributeDefault : [CIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:1.0] |
}; |
return @{ |
@"inputDistance" : distanceDictionary, |
@"inputSlope" : slopeDictionary, |
@"inputColor": colorDictionary, |
// This is needed because the filter is registered under a different name than the class. |
kCIAttributeFilterName : @"MyHazeRemover" |
}; |
} |
@end |
Copyright © 2012 Apple Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2012-10-31