TwoTerm/ScanLineFilter.m
Kelvin Sherlock 04d96f94ce change scanline filter.
git-svn-id: svn://qnap.local/TwoTerm/trunk@2004 5590a31f-7b70-45f8-8c82-aa3a8e5f4507
2011-01-20 23:24:03 +00:00

77 lines
2.0 KiB
Objective-C

//
// 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: 0.40], kCIAttributeDefault,
[NSNumber numberWithDouble: 0.00], kCIAttributeIdentity,
kCIAttributeTypeDistance, kCIAttributeType,
nil], @"inputStrength",
nil];
}
// called when setting up for fragment program and also calls fragment program
- (CIImage *)outputImage
{
float strength;
CISampler *src;
src = [CISampler samplerWithImage:inputImage];
strength = [inputStrength floatValue];
if (strength < 0) strength = 0;
if (strength > 1.0) strength = 1.0;
return [self apply: _kernel, src, [NSNumber numberWithFloat: strength], nil];
}
@end