/*

    File: AppController.m

Abstract: View and Controller classes.

 Version: 1.1

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*/

#import "AppController.h"

@implementation AppView

- (id) initWithCoder:(NSCoder*)decoder

{

    /* Register for drag & drop */

    if(self = [super initWithCoder:decoder])

    [self registerForDraggedTypes:[NSArray arrayWithObjects:NSFilenamesPboardType, nil]];

    return self;

}

- (NSDragOperation) draggingEntered:(id<NSDraggingInfo>)sender

{

    NSPasteboard*               pasteboard = [sender draggingPasteboard];

    CGImageSourceRef            sourceRef;

    /* Check if the dragged file is valid by creating an ImageIO source with it */

    if([[pasteboard types] containsObject:NSFilenamesPboardType]) {

        if(_sourceRef = CGImageSourceCreateWithURL((CFURLRef)[NSURL fileURLWithPath:[[pasteboard propertyListForType:NSFilenamesPboardType] objectAtIndex:0]], NULL))

        return NSDragOperationCopy;

    }

    return NSDragOperationNone;

}

- (void) draggingExited:(id<NSDraggingInfo>)sender

{

    /* Destroy ImageIO source */

    if(_sourceRef) {

        CFRelease(_sourceRef);

        _sourceRef = NULL;

    }

}

- (BOOL) performDragOperation:(id<NSDraggingInfo>)sender

{

    CGImageRef                  imageRef;

    /* Create the image from the dragged file and update our application controller */

    if(_sourceRef) {

        if(imageRef = CGImageSourceCreateImageAtIndex(_sourceRef, 0, NULL)) {

            [(AppController*)[NSApp delegate] setSourceImage:imageRef];

            CGImageRelease(imageRef);

        }

        CFRelease(_sourceRef);

        _sourceRef = NULL;

        return (imageRef ? YES : NO);

    }

    return NO;

}

- (void) mouseDown:(NSEvent*)event

{

    NSPoint                     point = [self convertPoint:[event locationInWindow] fromView:nil];

    /* Start drag & drop */

    if([self loadedComposition])

    [self dragPromisedFilesOfTypes:[NSArray arrayWithObject:@"png"] fromRect:NSMakeRect(point.x - 16, point.y - 16, 32, 32) source:self slideBack:YES event:event];

}

- (NSArray*) namesOfPromisedFilesDroppedAtDestination:(NSURL*)dropDestination

{

    unsigned                    index = 0;

    NSArray*                    array = nil;

    CGImageRef                  imageRef;

    CGImageDestinationRef       destinationRef;

    NSString*                   name;

    /* Make sure we are dragging to a file */

    if(![dropDestination isFileURL])

    return nil;

    /* Get the resized image from our application controller */

    imageRef = [(AppController*)[NSApp delegate] getResizedImage];

    if(imageRef == NULL)

    return nil;

    /* Generate a unique file name */

    do {

        index += 1;

        name = [NSString stringWithFormat:@"Image-%i.png", index];

    } while([[NSFileManager defaultManager] fileExistsAtPath:[[NSURL URLWithString:name relativeToURL:dropDestination] path]]);

    /* Save the CGImageRef as a PNG file using ImageIO */

    if(destinationRef = CGImageDestinationCreateWithURL((CFURLRef)[NSURL URLWithString:name relativeToURL:dropDestination], kUTTypePNG, 1, NULL)) {

        CGImageDestinationAddImage(destinationRef, imageRef, NULL);

        if(CGImageDestinationFinalize(destinationRef))

        array = [NSArray arrayWithObject:name];

        CFRelease(destinationRef);

    }

    return array;

}

@end

@implementation AppController

- (void) applicationDidFinishLaunching:(NSNotification*)notification

{

    /* Load the preview composition on the QCView */

    [qcView loadCompositionFromFile:[[NSBundle mainBundle] pathForResource:@"Composition" ofType:@"qtz"]];

    [qcView startRendering];

}

- (void) applicationWillTerminate:(NSNotification*)notification

{

    /* Clean up */

    if(_imageRef)

    CGImageRelease(_imageRef);

    if(_renderer)

    [_renderer release];

}

- (void) windowWillClose:(NSNotification*)notification

{

    /* Terminate the application */

    [NSApp terminate:self];

}

- (BOOL) compositionParameterView:(QCCompositionParameterView*)parameterView shouldDisplayParameterWithKey:(NSString*)portKey attributes:(NSDictionary*)portAttributes

{

    /* Make sure the input image parameter is not visible as we are setting it directly */

    return ![portKey isEqualToString:QCCompositionInputImageKey];

}

- (void) compositionParameterView:(QCCompositionParameterView*)parameterView didChangeParameterWithKey:(NSString*)portKey

{

    /* Since one of the parameter has changed, we need to re-renderer the QCRenderer */

    if(![_renderer renderAtTime:0.0 arguments:nil])

    NSLog(@"QCRenderer failed rendering");

    /* Forward the image produced by the QCRenderer to the preview composition on the QCView */

    [qcView setValue:[_renderer valueForOutputKey:QCCompositionOutputImageKey ofType:@"QCImage"] forInputKey:@"inImage"];

}

- (void) setSourceImage:(CGImageRef)imageRef

{

    static CGColorSpaceRef              deviceRGBColorSpace = NULL;

    QCComposition*                      composition = [[QCCompositionRepository sharedCompositionRepository] compositionWithIdentifier:@"/image resizer"];

    CGColorSpaceRef                     colorSpace;

    /* Keep around DeviceRGB colorspace */

    if(deviceRGBColorSpace == NULL)

    deviceRGBColorSpace = CGColorSpaceCreateDeviceRGB();

    /* Replace our current image with the new one and re-create the QCRenderer */

    if(imageRef != _imageRef) {

        CGImageRelease(_imageRef);

        _imageRef = CGImageRetain(imageRef);

        /* Compute colorspace to use for the QCRenderer (use the one from the source image if possible - Quartz Composer cannot render in gray or device colorspaces) */

        colorSpace = CGImageGetColorSpace(imageRef);

        if((CGColorSpaceGetModel(colorSpace) != kCGColorSpaceModelRGB) || CFEqual(colorSpace, deviceRGBColorSpace))

        colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);

        else

        colorSpace = CGColorSpaceRetain(colorSpace);

        /* Re-create QCRenderer and set source image */

        [_renderer release];

        _renderer = [[QCRenderer alloc] initWithComposition:composition colorSpace:colorSpace];

        [_renderer setValue:(id)_imageRef forInputKey:QCCompositionInputImageKey];

        [paramView setCompositionRenderer:_renderer];

        /* We don't need the colorspace anymore */

        CGColorSpaceRelease(colorSpace);

        /* Force-update the preview composition in the QCView */

        [self compositionParameterView:nil didChangeParameterWithKey:nil];

    }

}

- (CGImageRef) getResizedImage

{

    return (CGImageRef)[_renderer valueForOutputKey:QCCompositionOutputImageKey ofType:@"CGImage"];

}

@end