AppController.m

/*
    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