/*

     File: CITextLayer.m

 Abstract: The CITextLayer handles the rendering of the text.

  Version: 1.3

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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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 */

#import "CITextLayer.h"

@implementation TextObject

- (id)initWithRect:(CGRect)inRect

{

    self = [super init];

    if (self) {

        textRect = *(NSRect*)(&inRect);

        text = [[NSAttributedString alloc] initWithString:@"Text" attributes:@{ NSFontAttributeName:[NSFont messageFontOfSize:48.0]}];

    }

    return self;

}

- (void)dealloc

{

    [text release];

    [super dealloc];

}

- (NSAttributedString*)getText

{

    return text;

}

- (void)setText:(NSAttributedString*)inString

{

    [inString retain];

    [text release];

    text = [inString copy];

    [inString release];

    textRect.size = [text size];

}

- (NSRect)getTextRect

{

    return textRect;

}

- (void)renderIntoCurrentContext

{

    [text drawInRect:textRect];

}

- (BOOL)pointInObject:(NSPoint)inPoint;

{

    return NSPointInRect(inPoint, textRect);

}

@end

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

@interface CITextLayer (private)

- (void)renderText;

@end

@implementation CITextLayer

- (id)initWithDelegate:(id)inDelegate targetRect:(CGRect)inRect  ciContext:(CIContext*)inCIContext

{

    self = [super initWithDelegate:inDelegate];

    if (self == nil)

        return nil;

    ciContext = inCIContext;

    textObjects = [[NSMutableArray alloc] init];

    layerRect = inRect;

    invertFilter = [[CIFilter filterWithName:@"CIColorInvert"] retain];

    blurFilter = [[CIFilter filterWithName:@"CIGaussianBlur" keysAndValues:@"inputRadius", [NSNumber numberWithDouble:3.0], nil] retain];

    compositeFilter = [[CIFilter filterWithName:@"CISourceOverCompositing"] retain];

    if(ciContext) 

    {

        // if a CIContext is available, we use it to create a CGLayer from that context as it is colormatched

        layer = [ciContext createCGLayerWithSize:layerRect.size  info: nil];

        bitmapContext = CGLayerGetContext(layer);

    } else {

        // otherwise we create a CGBitmapContext

        CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB(); 

        size_t      bytesPerRow, width, height;

        width = floor(layerRect.size.width);

        height = floor(layerRect.size.height);

        bytesPerRow = (width * 4 + 63) & ~63;

        bitmapData = calloc(bytesPerRow * height, 1);

        bitmapContext = CGBitmapContextCreate(bitmapData, width, height, 8 ,bytesPerRow, colorspace, kCGImageAlphaPremultipliedLast);

        CGColorSpaceRelease(colorspace);

    }

    [self renderText]; // create initial image

    return self;

}

- (void)dealloc

{

    [textImage release];

    [textObjects release];

    [invertFilter release];

    [blurFilter release];

    if(layer) 

    {

        CGLayerRelease(layer);

    } else {

        CGContextRelease(bitmapContext);

        free(bitmapData);

    }

    [super dealloc];

}

- (void)renderText

{

    // release the old image

    [textImage release];

    textImage = nil;

    // render the text objects into the context

    CGContextClearRect(bitmapContext,layerRect);

    NSGraphicsContext       *savedContext = [NSGraphicsContext currentContext];

    NSGraphicsContext       *graphicsContext = [NSGraphicsContext graphicsContextWithGraphicsPort:bitmapContext flipped:NO];

    [NSGraphicsContext setCurrentContext:graphicsContext];

    [textObjects makeObjectsPerformSelector:@selector(renderIntoCurrentContext)];

    if(layer)

    {

        // we can render using the CGLayer

        textImage = [[CIImage alloc] initWithCGLayer: layer];

    } else {

        // create a CIImage from the bitmap context by the way of creating a CGImage - this causes a copy !

        CGImageRef      bitmapImage = nil;

        bitmapImage = CGBitmapContextCreateImage(bitmapContext);

        if(!bitmapImage)

            return;

        textImage = [[CIImage alloc] initWithCGImage: bitmapImage];

        CGImageRelease(bitmapImage);    // now retained by the CIImage

    }

    [invertFilter setValue:textImage forKey:@"inputImage"];

    [blurFilter setValue:[invertFilter valueForKey:@"outputImage"] forKey:@"inputImage"];

    [compositeFilter setValue:textImage forKey:@"inputImage"];

    [compositeFilter setValue:[blurFilter valueForKey:@"outputImage"] forKey:@"inputBackgroundImage"];

    [NSGraphicsContext setCurrentContext:savedContext];

}

- (CIImage*)getLayerImage

{

    return [compositeFilter valueForKey:@"outputImage"];

}

- (void)mouseDown:(NSEvent*)theEvent view:(NSView*)inView

{

    NSPoint         location = [inView convertPoint:[theEvent locationInWindow] fromView:nil];

    NSEnumerator        *enumerator = [textObjects objectEnumerator];

    TextObject          *textObject = nil;

    // check if the click was on an existing text object

    while(textObject = [enumerator nextObject])

    {

        if([textObject pointInObject:location])

            break;

        textObject = nil;

    }

    if(!textObject) // user did not click on a text object so lets create a new one

    {

        CGRect      targetRect = CGRectMake(location.x, location.y, 50.0, 50.0);

        textObject = [[TextObject alloc] initWithRect:targetRect];

        [textObjects addObject:textObject];

        [textObject release];               // now retained by textObjects array

    }

    [layerDelegate doTextEditSession:textObject];

    if([textObject getText] == nil)         // no text means the text object gets deleted

        [textObjects removeObject:textObject];

    // render our output

    [self renderText];

    // cause the document to redraw

    [layerDelegate refresh:[self getRect]];

}

@end