/*

 * Copyright (C) 2006 Oliver Hunt <ojh16@student.canterbury.ac.nz>.  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 THE AUTHOR ``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 THE AUTHOR 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 "config.h"

#import "WKLinearTransferFilter.h"

#if ENABLE(SVG) && ENABLE(SVG_EXPERIMENTAL_FEATURES)

static CIKernel *linearTransferFilter = nil;

@implementation WKLinearTransferFilter

+ (void)initialize

{

    [CIFilter registerFilterName:@"WKLinearTransfer"

                     constructor:self

                 classAttributes:[NSDictionary dictionaryWithObjectsAndKeys:

                     @"WebKit Linear Transfer", kCIAttributeFilterDisplayName,

                     [NSArray arrayWithObjects:kCICategoryStylize, kCICategoryVideo,

                         kCICategoryStillImage, kCICategoryNonSquarePixels,nil], kCIAttributeFilterCategories,

                     [NSDictionary dictionaryWithObjectsAndKeys:

                         [NSNumber numberWithDouble:1.0], kCIAttributeDefault,

                         [NSNumber numberWithDouble:1.0], kCIAttributeIdentity,

                         kCIAttributeTypeScalar, kCIAttributeType,

                         nil], @"inputSlope",

                     [NSDictionary dictionaryWithObjectsAndKeys:

                         [NSNumber numberWithDouble:0.0], kCIAttributeDefault,

                         [NSNumber numberWithDouble:0.0], kCIAttributeIdentity,

                         kCIAttributeTypeScalar, kCIAttributeType,

                         nil], @"inputIntersection",

                     nil]];

}

+ (CIFilter *)filterWithName:(NSString *)name

{

    return [[[self alloc] init] autorelease];

}

- (id)init

{

    if (!linearTransferFilter) {

        NSBundle *bundle = [NSBundle bundleForClass:[self class]];

        NSString *kernelFile = [bundle pathForResource:@"WKLinearTransferFilter" ofType:@"cikernel"];

        NSString *code = [NSString stringWithContentsOfFile:kernelFile encoding:NSUTF8StringEncoding error:0];

        NSArray *kernels = [CIKernel kernelsWithString:code];

        linearTransferFilter = [[kernels objectAtIndex:0] retain];

    }

    return [super init];

}

- (CIImage *)outputImage

{

    CISampler *inputSampler = [CISampler samplerWithImage: inputImage];

    return [self apply:linearTransferFilter, inputSampler, inputSlope, inputIntercept, @"definition", [inputSampler definition], nil];

}

@end

#endif ENABLE(SVG) && ENABLE(SVG_EXPERIMENTAL_FEATURES)