/*

        File: AppController.m

    Abstract: View and Controller classes.

     Version: 1.1

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    The Apple Software is provided by Apple on an "AS IS" basis.  APPLE

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    Copyright (C) 2009 Apple Inc. All Rights Reserved.

*/

#import "AppController.h"

@implementation AppView

/* We override this method to know whenever the composition is rendered in the QCView */

- (BOOL) renderAtTime:(NSTimeInterval)time arguments:(NSDictionary*)arguments

{

    id                                      image;

    /* Call super so that rendering happens */

    if(![super renderAtTime:time arguments:arguments])

    return NO;

    /* Retrieve the current video input image from the "videoImage" output of the composition then use it as a default image for the Composition Picker panel

        Because we pass the image from one Quartz Composer object to another one, we can use the optimized QCImage type

    */

    if(image = [self valueForOutputKey:@"videoImage" ofType:@"QCImage"])

    [[[QCCompositionPickerPanel sharedCompositionPickerPanel] compositionPickerView] setDefaultValue:image forInputKey:QCCompositionInputImageKey];

    return YES;

}

@end

@implementation AppController

- (void) _didSelectComposition:(NSNotification*)notification

{

    QCComposition*                      composition = [[notification userInfo] objectForKey:@"QCComposition"];

    /* Set the identifier of the selected composition on the "compositionIdentifier" input of the composition,

        which passes it in turn to a Composition Loader patch which loads the composition and applies it to the video input */

    [qcView setValue:[composition identifier] forInputKey:@"compositionIdentifier"];

}

- (void) applicationDidFinishLaunching:(NSNotification*)notification

{

    QCCompositionPickerPanel*               pickerPanel = [QCCompositionPickerPanel sharedCompositionPickerPanel];

    /* Load our composition file on the QCView and start rendering */

    if(![qcView loadCompositionFromFile:[[NSBundle mainBundle] pathForResource:@"Composition" ofType:@"qtz"]])

    [NSApp terminate:nil];

    [qcView startRendering];

    /* Configure and show the Composition Picker panel */

    [[pickerPanel compositionPickerView] setAllowsEmptySelection:YES];

    [[pickerPanel compositionPickerView] setShowsCompositionNames:YES];

    [[pickerPanel compositionPickerView] setCompositionsFromRepositoryWithProtocol:QCCompositionProtocolImageFilter andAttributes:nil];

    [pickerPanel orderFront:nil];

    /* Register for composition picker panel notifications */

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(_didSelectComposition:) name:QCCompositionPickerPanelDidSelectCompositionNotification object:nil];

}

- (void) applicationWillTerminate:(NSNotification*)notification

{

    /* Unregister from composition picker panel notifications */

    [[NSNotificationCenter defaultCenter] removeObserver:self name:QCCompositionPickerPanelDidSelectCompositionNotification object:nil];

}

- (void) windowWillClose:(NSNotification*)notification

{

    [NSApp terminate:self];

}

- (IBAction) toggleCompositionPicker:(id)sender

{

    QCCompositionPickerPanel*               pickerPanel = [QCCompositionPickerPanel sharedCompositionPickerPanel];

    /* Toggle the Composition Picker panel visibility */

    if([pickerPanel isVisible])

    [pickerPanel orderOut:sender];

    else

    [pickerPanel orderFront:sender];

}

- (IBAction) savePNG:(id)sender

{

    NSSavePanel*                            savePanel = [NSSavePanel savePanel];

    CGImageRef                              imageRef;

    CGImageDestinationRef                   destinationRef;

    /* Display the save panel */

    [savePanel setRequiredFileType:@"png"];

    if([savePanel runModalForDirectory:nil file:@"My Picture"] == NSFileHandlingPanelOKButton) {

        /* Grab the current contents of the QCView as a CGImageRef and use ImageIO to save it as a PNG file */

        if(imageRef = (CGImageRef)[qcView createSnapshotImageOfType:@"CGImage"]) {

            if(destinationRef = CGImageDestinationCreateWithURL((CFURLRef)[NSURL fileURLWithPath:[savePanel filename]], kUTTypePNG, 1, NULL)) {

                CGImageDestinationAddImage(destinationRef, imageRef, NULL);

                if(!CGImageDestinationFinalize(destinationRef))

                NSBeep();

                CFRelease(destinationRef);

            }

            else

            NSBeep();

            CGImageRelease(imageRef);

        }

        else

        NSBeep();

    } 

}

@end