CIFunHouse/Custom Filters/PixellatedPeople.m
/* |
File: PixellatedPeople.m |
Abstract: |
Version: 1.0 |
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*/ |
#if TARGET_OS_IPHONE |
#import <CoreImage/CoreImage.h> |
#else |
#import <QuartzCore/QuartzCore.h> |
#endif |
@interface PixellatedPeople : CIFilter |
{ |
CIImage *inputImage; |
NSNumber *inputScale; |
} |
@property (retain, nonatomic) CIImage *inputImage; |
@property (copy, nonatomic) NSNumber *inputScale; |
@end |
@implementation PixellatedPeople |
@synthesize inputImage; |
@synthesize inputScale; |
+ (NSDictionary *)customAttributes |
{ |
return @{ |
kCIAttributeFilterDisplayName : |
@"Pixellated People", |
kCIAttributeFilterCategories : |
@[kCICategoryDistortionEffect, kCICategoryVideo, kCICategoryInterlaced, kCICategoryNonSquarePixels, kCICategoryStillImage], |
@"inputScale" : |
@{ |
kCIAttributeMin : @0.1, |
kCIAttributeSliderMin : @0.1, |
kCIAttributeSliderMax : @10.0, |
kCIAttributeDefault : @10.0, |
kCIAttributeIdentity : @1.0, |
kCIAttributeType : kCIAttributeTypeDistance |
} |
}; |
} |
- (void)setDefaults |
{ |
self.inputScale = @10.0; |
} |
- (CIImage *)outputImage |
{ |
static CIDetector *detector = nil; |
static dispatch_once_t onceToken; |
dispatch_once(&onceToken, ^{ |
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:CIDetectorAccuracyLow, CIDetectorAccuracy, nil]; |
detector = [CIDetector detectorOfType:CIDetectorTypeFace context:nil options:options]; |
}); |
NSArray *faceArray = [detector featuresInImage:inputImage]; |
if ( ! faceArray || [faceArray count] <= 0 ) |
return inputImage; // no faces found. |
CIImage *maskImage = nil; |
for ( CIFeature *f in faceArray ) |
{ |
CIVector *center = [CIVector vectorWithX:f.bounds.origin.x + f.bounds.size.width/2.0f |
Y:f.bounds.origin.y + f.bounds.size.height/2.0f]; |
CGFloat radius = MIN ( f.bounds.size.width, f.bounds.size.height ) / 1.5; |
CIImage *circleImage = [CIFilter filterWithName:@"CIRadialGradient" keysAndValues: |
@"inputRadius0", [NSNumber numberWithFloat:radius], |
@"inputRadius1", [NSNumber numberWithFloat:radius+1.0f], |
@"inputColor0", [CIColor colorWithRed:0.0 green:1.0 blue:0.0 alpha:1.0], |
@"inputColor1", [CIColor colorWithRed:0.0 green:1.0 blue:0.0 alpha:0.0], |
@"inputCenter", center, |
nil].outputImage; |
if ( nil == maskImage ) |
maskImage = circleImage; |
else |
maskImage = [CIFilter filterWithName:@"CISourceOverCompositing" keysAndValues: |
kCIInputImageKey, circleImage, kCIInputBackgroundImageKey, maskImage, |
nil].outputImage; |
} |
CGRect r = [inputImage extent]; |
CGFloat xCenter = r.origin.x + r.size.width / 2.0; |
CGFloat yCenter = r.origin.y + r.size.height / 2.0; |
CGFloat scale = (MAX(r.size.width,r.size.height) / 60.0) * [inputScale floatValue]; |
CIImage *pixellatedImage = [CIFilter filterWithName:@"CIPixellate" keysAndValues: |
kCIInputImageKey, inputImage, |
@"inputScale", [NSNumber numberWithFloat:scale], |
@"inputCenter", [CIVector vectorWithX:xCenter Y:yCenter], |
nil].outputImage; |
CIImage *result = [CIFilter filterWithName:@"CIBlendWithMask" keysAndValues: |
kCIInputImageKey, pixellatedImage, |
@"inputMaskImage", maskImage, |
kCIInputBackgroundImageKey, inputImage, |
nil].outputImage; |
return result; |
} |
@end |
Copyright © 2013 Apple Inc. All Rights Reserved. Terms of Use | Privacy Policy | Updated: 2013-06-13