WKNormalMapFilter.m [plain text]
/*
* Copyright (C) 2005 Apple Computer, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#import "WKNormalMapFilter.h"
static CIKernel *convolveKernel = nil;
static CIKernel *normalMapKernel = nil;
@implementation WKNormalMapFilter
+ (void)initialize
{
[CIFilter registerFilterName:@"WKNormalMap"
constructor:self
classAttributes:[NSDictionary dictionaryWithObjectsAndKeys:
@"WebKit Normal Map", kCIAttributeFilterDisplayName,
[NSArray arrayWithObjects: kCICategoryBlur, kCICategoryVideo,
kCICategoryStillImage, kCICategoryNonSquarePixels, nil], kCIAttributeFilterCategories,
[NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithDouble:0.0], kCIAttributeMin,
[NSNumber numberWithDouble:1.0], kCIAttributeDefault,
[NSNumber numberWithDouble:1.0], kCIAttributeIdentity,
kCIAttributeTypeScalar, kCIAttributeType,
nil], @"inputSurfaceScale",
nil]];
}
+ (CIFilter *)filterWithName:(NSString *)name
{
return [[[self alloc] init] autorelease];
}
- (id)init
{
if (!normalMapKernel) {
NSBundle *bundle = [NSBundle bundleForClass:[self class]];
NSString *kernelFile = [bundle pathForResource:@"WKNormalMapFilter" ofType:@"cikernel"];
NSString *code = [NSString stringWithContentsOfFile:kernelFile];
NSArray *kernels = [CIKernel kernelsWithString:code];
convolveKernel = [[kernels objectAtIndex:0] retain];
normalMapKernel = [[kernels objectAtIndex:1] retain];
}
return [super init];
}
- (NSArray *)xConvolveArgsWithBumpMap:(CISampler *)bumpMap {
return [NSArray arrayWithObjects:
bumpMap,
[NSNumber numberWithFloat:4],
[NSNumber numberWithFloat:0],
[CIVector vectorWithX:1 Y:2 Z:1],
[CIVector vectorWithX:0 Y:0 Z:0],
[CIVector vectorWithX:-1 Y:-2 Z:-1],
nil];
}
- (NSArray *)yConvolveArgsWithBumpMap:(CISampler *)bumpMap {
return [NSArray arrayWithObjects:
bumpMap,
[NSNumber numberWithFloat:4],
[NSNumber numberWithFloat:0],
[CIVector vectorWithX:1 Y:0 Z:-1],
[CIVector vectorWithX:2 Y:0 Z:-2],
[CIVector vectorWithX:1 Y:0 Z:-1],
nil];
}
- (CIImage *)outputImage
{
CISampler *image = [CISampler samplerWithImage:inputImage];
NSDictionary *applyOptions = [NSDictionary dictionaryWithObjectsAndKeys:[image definition], kCIApplyOptionDefinition, nil];
CIImage *convolveX = [self apply:convolveKernel arguments:[self xConvolveArgsWithBumpMap:image] options:applyOptions];
CIImage *convolveY = [self apply:convolveKernel arguments:[self yConvolveArgsWithBumpMap:image] options:applyOptions];
CISampler *samplerX = [CISampler samplerWithImage:convolveX];
CISampler *samplerY = [CISampler samplerWithImage:convolveY];
NSArray *normalMapArgs = [NSArray arrayWithObjects:samplerX, samplerY, image, inputSurfaceScale, nil];
return [self apply:normalMapKernel arguments:normalMapArgs options:applyOptions];
}
@end