CIFunHouse/Custom Filters/PixellateTransition.m
/* |
File: PixellateTransition.m |
Abstract: |
Version: 1.0 |
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*/ |
#if TARGET_OS_IPHONE |
#import <CoreImage/CoreImage.h> |
#else |
#import <QuartzCore/QuartzCore.h> |
#endif |
@interface PixellateTransition : CIFilter |
{ |
CIImage *inputImage; |
CIImage *inputTargetImage; |
NSNumber *inputTime; |
} |
@property (retain, nonatomic) CIImage *inputImage, *inputTargetImage; |
@property (copy, nonatomic) NSNumber *inputTime; |
@end |
@implementation PixellateTransition |
@synthesize inputImage; |
@synthesize inputTargetImage; |
@synthesize inputTime; |
+ (NSDictionary *)customAttributes |
{ |
return @{ |
kCIAttributeFilterDisplayName : |
@"Pixellate Transition", |
kCIAttributeFilterCategories : |
@[kCICategoryColorEffect, kCICategoryVideo, kCICategoryInterlaced, kCICategoryNonSquarePixels, kCICategoryStillImage], |
@"inputTargetImage" : |
@{ kCIAttributeType : kCIAttributeTypeImage }, |
@"inputTime" : |
@{ |
kCIAttributeMin : @0.0, |
kCIAttributeSliderMin : @0.0, |
kCIAttributeSliderMax : @1.0, |
kCIAttributeDefault : @0.0, |
kCIAttributeType : kCIAttributeTypeTime |
} |
}; |
} |
- (void)setDefaults |
{ |
self.inputTime = @0.0; |
} |
- (CIImage *)outputImage |
{ |
if ( ! inputTargetImage ) |
return inputImage; |
CGFloat t = [inputTime floatValue]; |
// XXX Alex -- seem to have some issues on the boundaries: |
if ( t < 0.001) |
return inputImage; |
else if ( t > 0.999 ) |
return inputTargetImage; |
CGFloat time = MIN(MAX(2.0 * (t - 0.25), 0.0), 1.0); |
CGFloat scale = 90.0 * (1.0 - 2.0 * fabs(t - 0.5)); |
CIImage *dissolveImage = [CIFilter filterWithName:@"CIDissolveTransition" keysAndValues: |
@"inputTime", [NSNumber numberWithFloat:time], |
kCIInputImageKey, inputImage, |
@"inputTargetImage", inputTargetImage, nil].outputImage; |
CGRect extent = [inputImage extent]; |
// scaling the image around the lower left part of the image. |
CIVector *center = [CIVector vectorWithX:extent.origin.x + extent.size.width / 4.0 |
Y:extent.origin.y + extent.size.height / 4.0]; |
return [CIFilter filterWithName:@"CIPixellate" keysAndValues: |
kCIInputImageKey, dissolveImage, |
@"inputScale", [NSNumber numberWithFloat:scale], |
@"inputCenter", center, |
nil |
].outputImage; |
} |
@end |
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