CIFunHouse/FilterAttributeBinding.m

/*
     File: FilterAttributeBinding.m
 Abstract: Binding between a CIFilter's attribute and a SliderCell instance.
  Version: 1.0
 
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 */
 
#import "FilterAttributeBinding.h"
#import "FilterStack.h"
#import "CIFilter+FHAdditions.h"
 
NSString *const FilterAttributeValueDidUpdateNotification = @"FilterAttributeValueDidUpdateNotification";
NSString *const FilterAttributeBindingFilterNameKey = @"FilterName";
NSString *const FilterAttributeBindingAttributeNameKey = @"AttributeName";
NSString *const FilterAttributeBindingAttributeValueStringKey = @"AttributeValueString";
 
NSString *const kFilterObject = @"FilterObject";
NSString *const kFilterInputValue = @"FilterInputValue";
NSString *const kFilterInputKey = @"FilterInputKey";
 
@implementation FilterAttributeBinding
@synthesize minElementValue = _minElementValue;
@synthesize maxElementValue = _maxElementValue;
 
- (id)initWithFilter:(CIFilter *)aFilter attributeName:(NSString *)name dictionary:(NSDictionary *)dictionary screenSize:(CGSize)screenSize;
{
    self = [super init];
    if (self)
    {
        _filter = aFilter;
        _attrName = [name copy];
        _screenSize = screenSize;
        
        NSString *className = [dictionary objectForKey:kCIAttributeClass];
        _attrClass = NSClassFromString(className);
        NSAssert1(_attrClass != nil, @"Must have a valid CIAttributeClass: %@", className);
        
        _attrDefault = [dictionary objectForKey:kCIAttributeDefault];
        
        _attrType = [dictionary objectForKey:kCIAttributeType];
        
        NSNumber *n = nil;
        if ((n = [dictionary objectForKey:kCIAttributeSliderMin]) != nil)
            _minElementValue = [n doubleValue];
        else if ((n = [dictionary objectForKey:kCIAttributeMin]) != nil)
            _minElementValue = [n doubleValue];            
        else
            _minElementValue = -5.0;
        
        if ((n = [dictionary objectForKey:kCIAttributeSliderMax]) != nil)
            _maxElementValue = [n doubleValue];
        else if ((n = [dictionary objectForKey:kCIAttributeMax]) != nil)
            _maxElementValue = [n doubleValue];            
        else
            _maxElementValue = 5.0;
        
        if ([[_filter name] isEqualToString:@"CICrop"])
        {
            // special settings for CICrop
            _minElementValue = 0.0;            
            _maxElementValue = FCGetGlobalCropFilterMaxValue();
            
            CIVector *inputRect = [_filter valueForKey:@"inputRectangle"];
            if ([inputRect isEqual:_attrDefault])
            {
                NSDictionary *info = @{ kFilterObject : _filter,
                                        kFilterInputValue : [CIVector vectorWithX:_minElementValue Y:_minElementValue Z:_maxElementValue W:_maxElementValue],
                                        kFilterInputKey : @"inputRectangle" };
                                        
                [[NSNotificationCenter defaultCenter] postNotificationName:FilterAttributeValueDidUpdateNotification object:nil userInfo:info];
            }
        }
        else if ([[_filter name] isEqualToString:@"CITemperatureAndTint"]) {
 
            // special settings for CITemperatureAndTint
            _minElementValue = 0.0;
            _maxElementValue = 15000.0;
        }
        else if ([[_filter name] isEqualToString:@"CIAffineTransform"]) {
 
            // special settings for CIAffineTransform
            _minElementValue = -M_PI * 2;
            _maxElementValue = M_PI * 2;
        }
        
        _sliderCellBindings = [[NSMutableDictionary alloc] init];        
    }
    return self;
}
 
- (NSString *)elementTitleForIndex:(NSUInteger)index
{
    if ([_attrDefault isKindOfClass:[NSNumber class]])
    {
        return @"Value";
    }
    else if ([_attrDefault isKindOfClass:[CIVector class]])
    {
        if ([(CIVector*)_attrDefault count] > 4)
            return [NSString stringWithFormat:@"%lu",(unsigned long)index];
        else
            return [NSString stringWithFormat:@"%c", "XYZW"[index] ];
    }
    else if ([_attrDefault isKindOfClass:[CIColor class]])
    {
        switch (index) {
            case 0: return @"R";
            case 1: return @"G";
            case 2: return @"B";
            case 3: return @"A";
            default: return @"Invalid";
        }
    }
    else if (CIFilterIsValueOfTypeCGAffineTransform(_attrDefault))
    {
        switch (index) {
            case 0: return @"a";
            case 1: return @"b";
            case 2: return @"c";
            case 3: return @"d";
            case 4: return @"tx";
            case 5: return @"ty";
            default: return @"Invalid";
        }        
    }
    
    return @"Invalid";
}
 
- (double)valueForIndex:(NSUInteger)index attribute:(id)attr
{
    if ([attr isKindOfClass:[NSNumber class]])
    {
        return [(NSNumber *)attr doubleValue];
    }
    else if ([attr isKindOfClass:[CIVector class]])
    {
        double v = [(CIVector *)attr valueAtIndex:index];
        if ([_attrType isEqualToString:kCIAttributeTypePosition])
        {
            if (index==0)
                v /= _screenSize.width;
            if (index==1)
                v /= _screenSize.height;
        }
        return v;
    }
    else if ([_attrDefault isKindOfClass:[CIColor class]])
    {
        switch (index) {
            case 0: return [(CIColor *)attr red];
            case 1: return [(CIColor *)attr green];
            case 2: return [(CIColor *)attr blue];
            case 3: return [(CIColor *)attr alpha];
            default: return NAN;
        }
    }
    else if (CIFilterIsValueOfTypeCGAffineTransform(_attrDefault))
    {
        CGAffineTransform transform;
        [attr getValue:&transform];
        switch (index) {
            case 0: return transform.a;
            case 1: return transform.b;
            case 2: return transform.c;
            case 3: return transform.d;
            case 4: return transform.tx;
            case 5: return transform.ty;
            default: return NAN;                
        }
    }
    
    return NAN;
}
 
- (double)defaultValueForIndex:(NSUInteger)index
{
    return [self valueForIndex:index attribute:_attrDefault];
}
 
- (double)elementValueForIndex:(NSUInteger)index
{
    return [self valueForIndex:index attribute:[_filter valueForKey:_attrName]];
}
 
- (void)bindSliderCell:(SliderCell *)cell toElementIndex:(NSUInteger)index
{
    NSAssert([_sliderCellBindings objectForKey:cell] == nil, @"Cell must not already be bound");
    [_sliderCellBindings setObject:[NSNumber numberWithUnsignedInteger:index] forKey:cell];
}
 
- (void)unbindSliderCell:(SliderCell *)cell
{
    NSAssert([_sliderCellBindings objectForKey:cell] != nil, @"Cell must already be bound");
    [_sliderCellBindings removeObjectForKey:cell];
}
 
- (void)revertToDefaultValues
{
    //[_filter setValue:_attrDefault forKey:_attrName]
    NSDictionary *info = [NSDictionary dictionaryWithObjectsAndKeys:_filter, kFilterObject, _attrDefault, kFilterInputValue, _attrName, kFilterInputKey, nil];
 
    // special case for CICrop
    if ([[_filter name] isEqualToString:@"CICrop"])
    {
        info = @{ kFilterObject : _filter,
                  kFilterInputValue : [CIVector vectorWithX:_minElementValue Y:_minElementValue Z:_maxElementValue W:_maxElementValue],
                  kFilterInputKey : @"inputRectangle" };
    }
    
    for (SliderCell *cell in _sliderCellBindings)
    {
        NSNumber *indexObj = [_sliderCellBindings objectForKey:cell];
        cell.slider.value = [self elementValueForIndex:[indexObj unsignedIntegerValue]];
        [cell.slider sendActionsForControlEvents:UIControlEventValueChanged];
    }
 
    [[NSNotificationCenter defaultCenter] postNotificationName:FilterAttributeValueDidUpdateNotification object:_filter userInfo:info];
}
 
#pragma mark - Properties
 
- (NSUInteger)elementCount
{
    if ([_attrDefault isKindOfClass:[NSNumber class]])
        return 1;
    
    else if ([_attrDefault isKindOfClass:[CIVector class]])
        return [(CIVector *)_attrDefault count];
    
    else if ([_attrDefault isKindOfClass:[CIColor class]])
        return 4;
    
    else if (CIFilterIsValueOfTypeCGAffineTransform(_attrDefault))
        return 6;
    
    return 0;
}
 
- (NSString *)title
{
    return CIFilterGetShortenedInputAttributeName(_attrName);
}
 
#pragma mark - Delegate methods
 
- (void)sliderCellValueDidChange:(SliderCell *)cell
{
    NSNumber *indexObj = [_sliderCellBindings objectForKey:cell];
    NSAssert(index, @"Slider cell value change must be originated from a binding");
    
    NSUInteger index = [indexObj unsignedIntegerValue];
    
    id attrValue = nil;
    
    if ([_attrDefault isKindOfClass:[NSNumber class]])
    {
        double value = (double)cell.slider.value;
        //[_filter setValue:[NSNumber numberWithDouble:value] forKey:_attrName];
        attrValue = [NSNumber numberWithDouble:value];
    }
    else if ([_attrDefault isKindOfClass:[CIVector class]])
    {
        CGFloat newValue = (CGFloat)cell.slider.value;
        if ([_attrType isEqualToString:kCIAttributeTypePosition])
        {
            if (index==0)
                newValue *= _screenSize.width;
            if (index==1)
                newValue *= _screenSize.height;
        }
 
        CIVector *vOld = (CIVector *)[_filter valueForKey:_attrName];
        int vCount = [vOld count];
        
        if (index>=vCount)
            NSAssert(0, @"Invalid element index");
        
        CGFloat* vals = calloc(vCount, sizeof(CGFloat));
        for (int i=0; i<vCount; i++)
            vals[i] = [vOld valueAtIndex:i];
        
        vals[index] = newValue;
        
        CIVector* vNew  = [CIVector vectorWithValues:vals count:vCount];
 
        attrValue = vNew;
 
        free(vals);
    }
    else if ([_attrDefault isKindOfClass:[CIColor class]])
    {
        CGFloat newValue = (CGFloat)cell.slider.value;
        CIColor *c = (CIColor *)[_filter valueForKey:_attrName];
        CGFloat r = [c red];
        CGFloat g = [c green];
        CGFloat b = [c blue];
        CGFloat a = [c alpha];      
        
        switch (index) {
            case 0: r = newValue; break;
            case 1: g = newValue; break;
            case 2: b = newValue; break;
            case 3: a = newValue; break;
            default:
                NSAssert(0, @"Invalid element index");
        }
        
        c = [CIColor colorWithRed:r green:g blue:b alpha:a];
        //[_filter setValue:c forKey:_attrName];
        attrValue = c;
    }
    else if (CIFilterIsValueOfTypeCGAffineTransform(_attrDefault))
    {
        CGFloat newValue = (CGFloat)cell.slider.value;
        CGAffineTransform transform;
        [[_filter valueForKey:_attrName] getValue:&transform];
        switch (index) {
            case 0: transform.a = newValue; break;
            case 1: transform.b = newValue; break;
            case 2: transform.c = newValue; break;
            case 3: transform.d = newValue; break;
            case 4: transform.tx = newValue; break;
            case 5: transform.ty = newValue; break;
            default:
                NSAssert(0, @"Invalid element index");                
        }
        
        NSValue *newTransformValue = [NSValue valueWithCGAffineTransform:transform];
        attrValue = newTransformValue;
    }
 
    if (attrValue)
    {
        NSDictionary *info = @{ kFilterObject : _filter,  kFilterInputValue : attrValue,  kFilterInputKey : _attrName };
        [[NSNotificationCenter defaultCenter] postNotificationName:FilterAttributeValueDidUpdateNotification
                                                            object:_filter
                                                          userInfo:info];
    }
}
 
@end


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