/*

     File: LensFilter.m

 Abstract: Obj-C part of the filter.

  Version: 1.3

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 */

#import "LensFilter.h"

#import <Foundation/Foundation.h>

#import <ApplicationServices/ApplicationServices.h>

@implementation LensFilter

static CIKernel *_lensKernel = nil;

static CIKernel *_ringKernel = nil;

static CIImage *_ringMaterialImage = nil;

static CIImage *_lensShineImage = nil;

- (id)init

{

    NSBundle    *bundle;

    NSString    *code;

    NSArray     *kernels;

    NSString    *path;

    NSURL       *url;

    if(_lensKernel == nil)

    {

        NSStringEncoding    encoding = NSUTF8StringEncoding;

        NSError             *error = nil;

        bundle = [NSBundle bundleForClass:NSClassFromString(@"LensFilter")];

        code = [NSString stringWithContentsOfFile:[bundle pathForResource:@"lens" ofType:@"cikernel"] encoding:encoding error:&error];

        kernels = [CIKernel kernelsWithString:code];

        _lensKernel = [[kernels objectAtIndex:0] retain];

        _ringKernel = [[kernels objectAtIndex:1] retain];

        path = [bundle pathForResource:@"emap1" ofType:@"tiff"];

        url = [NSURL fileURLWithPath:path];

        _ringMaterialImage = [[CIImage imageWithContentsOfURL:url] retain];

        path = [bundle pathForResource:@"lensShine" ofType:@"tiff"];

        url = [NSURL fileURLWithPath:path];

        _lensShineImage = [[CIImage imageWithContentsOfURL:url] retain];

    }

    return [super init];

}

- (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:500.00], kCIAttributeSliderMax,

            [NSNumber numberWithDouble:250.00], kCIAttributeDefault,

            [NSNumber numberWithDouble:250.00], kCIAttributeIdentity,

            kCIAttributeTypeDistance,           kCIAttributeType,

            nil],                               @"inputWidth",

        [NSDictionary dictionaryWithObjectsAndKeys:

            [NSNumber numberWithDouble:  1.00], kCIAttributeMin,

            [NSNumber numberWithDouble:  1.00], kCIAttributeSliderMin,

            [NSNumber numberWithDouble:500.00], kCIAttributeSliderMax,

            [NSNumber numberWithDouble: 22.00], kCIAttributeDefault,

            [NSNumber numberWithDouble:  1.00], kCIAttributeIdentity,

            kCIAttributeTypeDistance,           kCIAttributeType,

            nil],                               @"inputRingWidth",

        [NSDictionary dictionaryWithObjectsAndKeys:

            [NSNumber numberWithDouble:  1.00], kCIAttributeMin,

            [NSNumber numberWithDouble:  1.00], kCIAttributeSliderMin,

            [NSNumber numberWithDouble: 30.00], kCIAttributeSliderMax,

            [NSNumber numberWithDouble:  9.20], kCIAttributeDefault,

            [NSNumber numberWithDouble:  7.00], kCIAttributeIdentity,

            kCIAttributeTypeDistance,           kCIAttributeType,

            nil],                               @"inputRingFilletRadius",

        [NSDictionary dictionaryWithObjectsAndKeys:

            [NSNumber numberWithDouble:  1.00], kCIAttributeMin,

            [NSNumber numberWithDouble:  1.00], kCIAttributeSliderMin,

            [NSNumber numberWithDouble: 10.00], kCIAttributeSliderMax,

            [NSNumber numberWithDouble:  3.00], kCIAttributeDefault,

            [NSNumber numberWithDouble:  1.00], kCIAttributeIdentity,

            kCIAttributeTypeScalar,             kCIAttributeType,

            nil],                               @"inputMagnification",

        [NSDictionary dictionaryWithObjectsAndKeys:

            [NSNumber numberWithDouble:  0.00], kCIAttributeMin,

            [NSNumber numberWithDouble:  0.00], kCIAttributeSliderMin,

            [NSNumber numberWithDouble:  1.00], kCIAttributeSliderMax,

            [NSNumber numberWithDouble:  0.86], kCIAttributeDefault,

            [NSNumber numberWithDouble:  1.00], kCIAttributeIdentity,

            kCIAttributeTypeScalar,             kCIAttributeType,

            nil],                               @"inputRoundness",

        [NSDictionary dictionaryWithObjectsAndKeys:

            [NSNumber numberWithDouble:  0.00], kCIAttributeMin,

            [NSNumber numberWithDouble:  0.00], kCIAttributeSliderMin,

            [NSNumber numberWithDouble:  1.00], kCIAttributeSliderMax,

            [NSNumber numberWithDouble:  0.50], kCIAttributeDefault,

            [NSNumber numberWithDouble:  1.00], kCIAttributeIdentity,

            kCIAttributeTypeScalar,             kCIAttributeType,

            nil],                               @"inputShineOpacity",

        nil];

}

- (CGRect)lensROI:(int)sampler forRect:(CGRect)R userInfo:(NSArray *)array

{

    CIVector *oCenter;

    NSNumber *oWidth, *oMagnification;

    CISampler *shine;

    oCenter = [array objectAtIndex:0];

    oWidth = [array objectAtIndex:1];

    oMagnification = [array objectAtIndex:2];

    shine = [array objectAtIndex:3];

    if (sampler == 2)

        return [shine extent];

    // determine the area of the original image used with the lens where it is

    // currently we only need R, because the lens is a magnifier

    if (sampler == 1)

    {

        float cx, cy, width, mag;

        cx = [oCenter X];

        cy = [oCenter Y];

        width = [oWidth floatValue];

        mag = [oMagnification floatValue];

        width /= mag;

        R = CGRectMake(cx - width, cy - width, width*2.0, width*2.0);

    }

    return R;

}

- (CGRect)ringROI:(int)sampler forRect:(CGRect)R userInfo:(CISampler *)material

{

    if (sampler == 0)

        return [material extent];

    return R;

}

// called when setting up for fragment program and also calls fragment program

- (CIImage *)outputImage

{

    float radius, cx, cy, ringwidth, mag;

    CGRect R, extent;

    CISampler *src, *shine, *material;

    CIImage *lensedImage, *ringImage;

    CIFilter *f;

    NSArray *array;

    CISampler *magsrc;

    CGAffineTransform CT;

    CIVector *shineSize, *materialSize;

    // get a non-magnified sampler for the image

    src = [CISampler samplerWithImage:inputImage];

    shine = [CISampler samplerWithImage:_lensShineImage];

    // establish a magnified sampler for the image

    cx = [inputCenter X];

    cy = [inputCenter Y];

    mag = [inputMagnification floatValue];

    CT = CGAffineTransformTranslate(CGAffineTransformScale(CGAffineTransformMakeTranslation(cx, cy), mag, mag), -cx, -cy);

    magsrc = [CISampler samplerWithImage:[inputImage imageByApplyingTransform:CT]];

    radius = [inputWidth floatValue] * 0.5;

    // calculate rectangle for lens effect

    R.origin.x = cx - radius;

    R.size.width = 2.0 * radius;

    R.origin.y = cy - radius;

    R.size.height = 2.0 * radius;

    // get size of shine map

    extent = [shine extent];

    shineSize = [CIVector vectorWithX:extent.size.width Y:extent.size.height];

    // set up ROI calculation for lens

    array = [NSArray arrayWithObjects:inputCenter, inputWidth, inputMagnification, shine, nil];

    [_lensKernel setROISelector:@selector(lensROI:forRect:userInfo:)];

    lensedImage = [self apply:_lensKernel, src, magsrc, shine, inputCenter, [NSNumber numberWithFloat:radius + 2.0],

      inputMagnification, inputRoundness, inputShineOpacity, shineSize,

      kCIApplyOptionDefinition, [[src definition] unionWithRect:R], kCIApplyOptionUserInfo, array, nil];

    // now put the ring over it

    material = [CISampler samplerWithImage:_ringMaterialImage];

    ringwidth = [inputRingWidth floatValue];

    // compute rectangle for the ring

    R.origin.x = cx - radius - ringwidth;

    R.size.width = 2.0 * (radius + ringwidth);

    R.origin.y = cy - radius - ringwidth;

    R.size.height = 2.0 * (radius + ringwidth);

    extent = [material extent];

    materialSize = [CIVector vectorWithX:extent.size.width Y:extent.size.height];

    // set up ROI calculation for the ring

    [_ringKernel setROISelector:@selector(ringROI:forRect:userInfo:)];

    ringImage = [self apply:_ringKernel, material, inputCenter, [NSNumber numberWithFloat:radius], [NSNumber numberWithFloat:radius+ringwidth], inputRingFilletRadius,

      materialSize,

      kCIApplyOptionDefinition, [CIFilterShape shapeWithRect:R], kCIApplyOptionUserInfo, material, nil];

    // place ring over lensed image

    f = [CIFilter filterWithName:@"CISourceOverCompositing" keysAndValues:@"inputImage", ringImage, @"inputBackgroundImage", lensedImage, nil];

    return [f valueForKey:@"outputImage"];

}

@end