PaintImageUnit/PaintFilter.m
/* |
File: PaintFilter.m |
Abstract: Obj-C part of the filter. |
Version: 1.3 |
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*/ |
#import "PaintFilter.h" |
#import <Foundation/Foundation.h> |
#import <ApplicationServices/ApplicationServices.h> |
@implementation PaintFilter |
static CIKernel *_paintKernel = nil; |
- (id)init |
{ |
if(_paintKernel == nil) |
{ |
NSStringEncoding encoding = NSUTF8StringEncoding; |
NSError *error = nil; |
NSBundle *bundle = [NSBundle bundleForClass:NSClassFromString(@"PaintFilter")]; |
NSString *code = [NSString stringWithContentsOfFile:[bundle pathForResource:@"paint" ofType:@"cikernel"] encoding:encoding error:&error]; |
NSArray *kernels = [CIKernel kernelsWithString:code]; |
_paintKernel = [[kernels objectAtIndex:0] retain]; |
} |
return [super init]; |
} |
- (NSDictionary *)customAttributes |
{ |
return [NSDictionary dictionaryWithObjectsAndKeys: |
[NSDictionary dictionaryWithObjectsAndKeys: |
[CIVector vectorWithX:200.0 Y:200.0], kCIAttributeDefault, |
kCIAttributeTypePosition, kCIAttributeType, |
nil], @"inputPoint1", |
[NSDictionary dictionaryWithObjectsAndKeys: |
[CIVector vectorWithX:300.0 Y:250.0], kCIAttributeDefault, |
kCIAttributeTypePosition, kCIAttributeType, |
nil], @"inputPoint2", |
[NSDictionary dictionaryWithObjectsAndKeys: |
[NSNumber numberWithDouble: 1.00], kCIAttributeMin, |
[NSNumber numberWithDouble: 1.00], kCIAttributeSliderMin, |
[NSNumber numberWithDouble:500.00], kCIAttributeSliderMax, |
[NSNumber numberWithDouble: 30.00], kCIAttributeDefault, |
[NSNumber numberWithDouble: 30.00], kCIAttributeIdentity, |
kCIAttributeTypeDistance, kCIAttributeType, |
nil], @"inputWidth", |
[NSDictionary dictionaryWithObjectsAndKeys: |
[CIColor colorWithRed:1.0 green:0.0 blue:0.0 alpha:1.0], kCIAttributeDefault, |
nil], @"inputColor", |
nil]; |
} |
// called when setting up for fragment program and also calls fragment program |
- (CIImage *)outputImage |
{ |
float radius, p0x, p0y, p1x, p1y, dx, dy, len; |
CIVector *v01; |
CGRect R; |
radius = [inputWidth floatValue] * 0.5; |
p0x = [inputPoint1 X]; |
p0y = [inputPoint1 Y]; |
p1x = [inputPoint2 X]; |
p1y = [inputPoint2 Y]; |
if (p0x < p1x) |
{ |
R.origin.x = p0x - radius; |
R.size.width = p1x - p0x + 2.0 * radius; |
} |
else |
{ |
R.origin.x = p1x - radius; |
R.size.width = p0x - p1x + 2.0 * radius; |
} |
if (p0y < p1y) |
{ |
R.origin.y = p0y - radius; |
R.size.height = p1y - p0y + 2.0 * radius; |
} |
else |
{ |
R.origin.y = p1y - radius; |
R.size.height = p0y - p1y + 2.0 * radius; |
} |
dx = [inputPoint1 X] - [inputPoint2 X]; |
dy = [inputPoint1 Y] - [inputPoint2 Y]; |
len = sqrt(dx*dx + dy*dy); |
if (len != 0.0) |
len = 1.0 / len; |
dx *= len; |
dy *= len; |
v01 = [CIVector vectorWithX:dx Y:dy]; |
return [self apply:_paintKernel, inputPoint1, inputPoint2, [NSNumber numberWithFloat:radius], v01, inputColor, |
kCIApplyOptionDefinition, [CIFilterShape shapeWithRect:R], nil]; |
} |
@end |
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