TwoTerm/ScanLineFilter.m

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//
// ScanLineFilter.m
// 2Term
//
// Created by Kelvin Sherlock on 7/10/2010.
// Copyright 2010 __MyCompanyName__. All rights reserved.
//
#import "ScanLineFilter.h"
#import <ApplicationServices/ApplicationServices.h>
@implementation ScanLineFilter
static CIKernel *_kernel = nil;
+(void)initialize
{
if (!_kernel)
{
NSError *err;
NSBundle *bundle = [NSBundle mainBundle];
NSString *path = [bundle pathForResource: @"ScanLineFilter" ofType: @"cikernel"];
NSString *code = [NSString stringWithContentsOfFile: path
encoding: NSUTF8StringEncoding
error: &err];
NSArray *array = [CIKernel kernelsWithString: code];
_kernel = [[array objectAtIndex: 0] retain];
}
}
- (NSDictionary *)customAttributes
{
return [NSDictionary dictionaryWithObjectsAndKeys:
[NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithDouble: 0.00], kCIAttributeMin,
[NSNumber numberWithDouble: 0.00], kCIAttributeMax,
[NSNumber numberWithDouble: 0.00], kCIAttributeSliderMin,
[NSNumber numberWithDouble: 1.00], kCIAttributeSliderMax,
[NSNumber numberWithDouble: 0.50], kCIAttributeDefault,
[NSNumber numberWithDouble: 0.00], kCIAttributeIdentity,
kCIAttributeTypeDistance, kCIAttributeType,
nil], @"inputOpacity",
nil];
}
// called when setting up for fragment program and also calls fragment program
- (CIImage *)outputImage
{
float opacity;
CISampler *src;
src = [CISampler samplerWithImage:inputImage];
opacity = [inputOpacity floatValue];
if (opacity < 0) opacity = 0;
if (opacity > 1.0) opacity = 1.0;
return [self apply: _kernel, src, [NSNumber numberWithFloat: opacity], nil];
}
@end