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