/*

     File: AppController.m

 Abstract: Code for creating, saving and loading a CIFilterGenerator.

 Here we export the three action to be hooked up in the nib.

  Version: 1.1

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#import <Quartz/Quartz.h>

#import "AppController.h"

@interface AppController ()

{

    CIFilterGenerator   *generator;

    CIFilter            *generatedFilter;

    CIImage             *image;

}

@property (nonatomic, weak) IBOutlet SampleCIView *testView;

@property (nonatomic, strong) IBOutlet NSPanel *filterPanel;

@end

NSString *ImageFileName = @"WWDC06Logo";

NSString *ImageFileExtension = @"tiff";

@implementation AppController

//--------------------------------------------------------------------------------------------------

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context;

{

    // draw the result of the filter into the view

    [self.testView setImage:[generatedFilter valueForKey:kCIOutputImageKey]];

}

//--------------------------------------------------------------------------------------------------

- (void)awakeFromNib

{

    // Make sure we have all Image Units available.

    [CIPlugIn loadAllPlugIns];  

    // Read the default image.

    NSURL *imageURL = [[NSBundle mainBundle] URLForResource:ImageFileName withExtension:ImageFileExtension];

    image = [CIImage imageWithContentsOfURL:imageURL];

    [self createFilterGenerator:nil];

}

//--------------------------------------------------------------------------------------------------

- (IBAction)createFilterGenerator:(id)sender

{

    // remove old view from the filter UI and remove observer from the old filter

    [self.filterPanel setContentView:nil];

    [generatedFilter removeObserver:self forKeyPath:@"outputImage"];

    generatedFilter = nil;

    generator = [CIFilterGenerator filterGenerator];

    CIFilter    *filter = [CIFilter filterWithName:@"CIComicEffect"];

    [filter setDefaults];

    CIFilter    *compositeFilter = [CIFilter filterWithName:@"CICopyMachineTransition"];

    [compositeFilter setDefaults];

    [compositeFilter setValue:@0.5 forKey:kCIInputTimeKey];

    // Connect the filters into the filter generator.

    [generator connectObject:filter withKey:kCIOutputImageKey toObject:compositeFilter withKey:kCIInputImageKey];

    [generator connectObject:nil withKey:kCIOutputImageKey toObject:[compositeFilter copy] withKey:kCIInputImageKey];

    // Export the time key of the transition, so the user can set it.

    [generator exportKey:kCIInputTimeKey fromObject:compositeFilter withName:kCIInputTimeKey];

    // Export both images of the transition to the same exported key.

    [generator exportKey:kCIInputImageKey fromObject:filter withName:kCIInputImageKey];

    [generator exportKey:kCIInputTargetImageKey fromObject:compositeFilter withName:kCIInputImageKey];

    // Export the output image.

    [generator exportKey:kCIOutputImageKey fromObject:compositeFilter withName:nil];

    // Set the class attributes for the filter.

    NSMutableDictionary *theClassAttributes = [[NSMutableDictionary alloc] init];   

    [theClassAttributes setObject:@"Sample CIFilterGenerator" forKey:kCIAttributeFilterDisplayName];

    [theClassAttributes setObject:@"A sample filter generator that wraps around a transition from a source image to a stylized version of the image" forKey:kCIAttributeDescription];

    [theClassAttributes setObject:[NSArray arrayWithObjects:kCICategoryStylize, kCICategoryStillImage, kCICategoryVideo, nil] forKey:kCIAttributeFilterCategories];

    [generator setClassAttributes:theClassAttributes];

    generatedFilter = [generator filter];

    [generatedFilter setValue:image forKey:kCIInputImageKey];

    [generatedFilter addObserver:self forKeyPath:@"outputImage" options:NSKeyValueObservingOptionNew context:nil];  

    [self.testView setImage:[generatedFilter valueForKey:kCIOutputImageKey]];

    // Create some UI for the filter.

    IKFilterUIView  *filterContentView = [generatedFilter viewForUIConfiguration:@{IKUISizeFlavor:IKUISizeMini} excludedKeys:@[kCIInputImageKey]];

    [self.filterPanel setContentSize:filterContentView.bounds.size];

    [self.filterPanel setContentView:filterContentView];

}

//--------------------------------------------------------------------------------------------------

- (IBAction)saveGenerator:(id)sender

{

    NSSavePanel *savePanel = [NSSavePanel savePanel];

    [savePanel setNameFieldStringValue:@"MyGenerator"];

    NSInteger rv = [savePanel runModal];

    if (rv == NSFileHandlingPanelOKButton)

    {

        // Just write out the generator

        if(![generator writeToURL:[savePanel URL] atomically:YES]) {

            NSLog(@"failed to write out generator");

        }

    }

}

//--------------------------------------------------------------------------------------------------

- (IBAction)loadGenerator:(id)sender

{

    NSOpenPanel *openPanel = [NSOpenPanel openPanel];

    [openPanel setCanChooseDirectories:NO];

    [openPanel setAllowsMultipleSelection:NO];

    [openPanel setResolvesAliases:YES];

    [openPanel setCanChooseFiles:YES];

    NSInteger rv = [openPanel runModal];

    if (rv == NSFileHandlingPanelOKButton) {

        // Remove old view from the filter UI and remove observer from the old filter.

        [self.filterPanel setContentView:nil];

        [generatedFilter removeObserver:self forKeyPath:@"outputImage"];

        generatedFilter = nil;

        generator = nil;

        // Load the generator.

        generator = [CIFilterGenerator filterGeneratorWithContentsOfURL:[openPanel URL]];

        // Create a filter from the generator.

        generatedFilter = [generator filter];

        // Set the default input image.

        [generatedFilter setValue:image forKey:kCIInputImageKey];

        // Register for KVO on the output image so that when the parameters of the filter change we draw again.

        [generatedFilter addObserver:self forKeyPath:@"outputImage" options:NSKeyValueObservingOptionNew context:nil];  

        // For the first time, draw the result of the filter into the view.

        [self.testView setImage:[generatedFilter valueForKey:kCIOutputImageKey]];

        // Create some UI for the filter.

        IKFilterUIView  *filterContentView = [generatedFilter viewForUIConfiguration:@{IKUISizeFlavor:IKUISizeMini} excludedKeys:@[kCIInputImageKey]];

        // ... and install the filter UI into the panel

        [self.filterPanel setContentSize:filterContentView.bounds.size];

        [self.filterPanel setContentView:filterContentView];

    }

}

//--------------------------------------------------------------------------------------------------

@end