/*

     File: TransitionSetup.m

 Abstract: Category for the TransitionSelectorView that 

 gathers all transitions and sets them up for

 rendering.

  Version: 1.2

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 */

#import "TransitionSelectorView.h"

@implementation TransitionSelectorView (TransitionSetup)

- (void)setupTransitions

{

    CIVector  *extent;

    int        i;

    if(!transitions)

    {

        // get all the transition filters

        NSArray *foundTransitions = [CIFilter filterNamesInCategories:[NSArray arrayWithObject:kCICategoryTransition]];

        if(!foundTransitions)

            return;

        i = [foundTransitions count];

        extent = [CIVector vectorWithX: 0  Y: 0  Z: thumbnailWidth  W: thumbnailHeight];

        transitions = [[NSMutableArray alloc] initWithCapacity:i];

        while(--i >= 0)

        {

            CIFilter    *theTransition = [CIFilter filterWithName:[foundTransitions objectAtIndex:i]];      // create the filter

            [theTransition setDefaults];    // initialize the filter with its defaults, as we might not set every value ourself

            // setup environment maps and other static parameters of the filters

            NSArray     *filterKeys = [theTransition inputKeys];

            NSDictionary    *filterAttributes = [theTransition attributes];

            if(filterKeys)

            {

                NSEnumerator    *enumerator = [filterKeys objectEnumerator];

                NSString        *currentKey;

                NSDictionary    *currentInputAttributes;

                while(currentKey = [enumerator nextObject]) 

                {

                    if([currentKey compare:@"inputExtent"] == NSOrderedSame)            // set the rendering extent to the size of the thumbnail

                        [theTransition setValue:extent forKey:currentKey];

                    else {

                        currentInputAttributes = [filterAttributes objectForKey:currentKey];

                        NSString            *classType = [currentInputAttributes objectForKey:kCIAttributeClass];

                        if([classType compare:@"CIImage"] == NSOrderedSame)

                        {

                            if([currentKey compare:@"inputShadingImage"] == NSOrderedSame)  // if there is a shading image, use our shading image

                                [theTransition setValue:[self shadingImage] forKey:currentKey];

                            else if ([currentKey compare:@"inputBacksideImage"] == NSOrderedSame)   // this is for the page curl transition

                                [theTransition setValue:[self sourceImage] forKey:currentKey];

                            else 

                                [theTransition setValue:[self maskImage] forKey:currentKey];

                        }

                    }

                }

            }

            [transitions addObject:theTransition];

        }

    }

}

@end