FunHouseMirrorFilter.m
/* |
File: FunHouseMirrorFilter.m |
Abstract: Obj-C part of the filter. |
Version: 1.0 |
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*/ |
#import "FunHouseMirrorFilter.h" |
#import <Foundation/Foundation.h> |
#import <ApplicationServices/ApplicationServices.h> |
@implementation FunHouseMirrorFilter |
static CIKernel *_funHouseMirrorKernel = nil; |
- (id)init |
{ |
if(_funHouseMirrorKernel == nil) |
{ |
NSError *err; |
NSBundle *bundle = [NSBundle bundleForClass:NSClassFromString(@"FunHouseMirrorFilter")]; |
NSString *code = [NSString stringWithContentsOfFile:[bundle pathForResource:@"funHouseMirror" ofType:@"cikernel"] encoding:NSUTF8StringEncoding error:&err]; |
NSArray *kernels = [CIKernel kernelsWithString:code]; |
_funHouseMirrorKernel = [[kernels objectAtIndex:0] retain]; |
} |
return [super init]; |
} |
- (CGRect)regionOf: (int)sampler destRect: (CGRect)rect userInfo: (NSNumber *)radius |
{ |
return CGRectInset(rect, -[radius floatValue], 0); |
} |
- (NSDictionary *)customAttributes |
{ |
return [NSDictionary dictionaryWithObjectsAndKeys: |
[NSDictionary dictionaryWithObjectsAndKeys: |
[CIVector vectorWithX:200.0 Y:200.0], kCIAttributeDefault, |
kCIAttributeTypePosition, kCIAttributeType, |
nil], @"inputCenter", |
[NSDictionary dictionaryWithObjectsAndKeys: |
[NSNumber numberWithDouble: 1.00], kCIAttributeMin, |
[NSNumber numberWithDouble: 1.00], kCIAttributeSliderMin, |
[NSNumber numberWithDouble:1000.00], kCIAttributeSliderMax, |
[NSNumber numberWithDouble:400.00], kCIAttributeDefault, |
[NSNumber numberWithDouble:400.00], kCIAttributeIdentity, |
kCIAttributeTypeDistance, kCIAttributeType, |
nil], @"inputWidth", |
[NSDictionary dictionaryWithObjectsAndKeys: |
[NSNumber numberWithDouble: 0.00], kCIAttributeMin, |
[NSNumber numberWithDouble: 0.00], kCIAttributeSliderMin, |
[NSNumber numberWithDouble: 2.00], kCIAttributeSliderMax, |
[NSNumber numberWithDouble: 0.50], kCIAttributeDefault, |
[NSNumber numberWithDouble: 0.00], kCIAttributeIdentity, |
kCIAttributeTypeDistance, kCIAttributeType, |
nil], @"inputAmount", |
nil]; |
} |
// called when setting up for fragment program and also calls fragment program |
- (CIImage *)outputImage |
{ |
float radius; |
CISampler *src; |
src = [CISampler samplerWithImage:inputImage]; |
radius = [inputWidth floatValue] * 0.5; |
return [self apply:_funHouseMirrorKernel, src, |
[NSNumber numberWithFloat:[inputCenter X]], |
[NSNumber numberWithFloat:1.0 / radius], |
[NSNumber numberWithFloat:radius], |
[NSNumber numberWithFloat: 1.0 / pow(10.0, [inputAmount floatValue])], |
kCIApplyOptionDefinition, [[src definition] insetByX:-radius Y:-radius], |
kCIApplyOptionUserInfo, [NSNumber numberWithFloat:radius], nil]; |
} |
@end |
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