/*

File: ImageView.m

Abstract: ImageView.m class implementation

Version: <1.0>

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*/

#import "ImageDoc.h"

#import "ImageView.h"

#import <Quartz/Quartz.h>

static const float  kMargin = 10;

@implementation ImageView

- (void) dealloc

{

    [[NSNotificationCenter defaultCenter] removeObserver:self];

}

- (id) initWithFrame:(NSRect)frameRect

{

    self = [super initWithFrame:frameRect];

    [[NSNotificationCenter defaultCenter]

        addObserver: self selector: @selector(newScreenProfile:)

        name: NSWindowDidChangeScreenProfileNotification object:nil];

    return self;

}

// This view completely covers its frame rectangle when drawing so return YES. 

//

- (BOOL) isOpaque

{

    return YES;

}

// Return a image transformation matrix that will fit the image in the view

//

- (CGAffineTransform) imageTransformToFitView

{

    CGRect imageRect = {{0,0}, [mImageDoc imageSize]};

    CGAffineTransform ctm = [mImageDoc imageTransform];

    CGSize ctmdSize = CGRectApplyAffineTransform(imageRect, ctm).size;

    NSSize destSize = NSInsetRect([self bounds], kMargin, kMargin).size;

    // scale to fit in view rect

    CGFloat scale = MIN(destSize.width/ctmdSize.width, destSize.height/ctmdSize.height);

    ctm = CGAffineTransformConcat(ctm, CGAffineTransformMakeScale(scale,scale));

    return ctm;

}

- (void) drawImage

{

    NSRect viewBounds = [self bounds];

    CGRect imageRect = {{0,0}, [mImageDoc imageSize]};

    // get transform matrix to fit image to view

    CGAffineTransform ctm = [self imageTransformToFitView];

    // center in view rect

    CGSize ctmdSize = CGRectApplyAffineTransform(imageRect, ctm).size;

    ctm.tx += viewBounds.origin.x + (viewBounds.size.width - ctmdSize.width)/2;

    ctm.ty += viewBounds.origin.y + (viewBounds.size.height - ctmdSize.height)/2;

    CGContextRef context = (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort];

    if (context==nil)

        return;

    // Concatenate the current graphics state's transformation matrix (the CTM)

    // with the affine transform `ctm'

    CGContextConcatCTM(context, ctm);

    // use low quality interpolation while live resizing

    CGInterpolationQuality q = [self inLiveResize] ? NSImageInterpolationNone : NSImageInterpolationHigh;

    CGContextSetInterpolationQuality(context, q);

    // now draw using updated transform

    [mImageDoc  drawImage:context imageRect:imageRect];

}

- (void) drawCIImage

{

    CGContextRef context = (CGContextRef)[[NSGraphicsContext currentContext] graphicsPort];

    if (context==nil)

        return;

    // scale to fit in view rect

    CIImage* image = [mImageDoc currentCIImageWithTransform:[self imageTransformToFitView]];

    if (image==nil)

        return;

    // center in view rect

    NSRect viewBounds = [self bounds];

    CGRect sRect = [image extent];

    CGRect dRect = sRect;

    dRect.origin.x = viewBounds.origin.x + (viewBounds.size.width - sRect.size.width)/2;

    dRect.origin.y = viewBounds.origin.y + (viewBounds.size.height - sRect.size.height)/2;

    CIContext* ciContext = [CIContext contextWithCGContext:context options:nil];

    [ciContext drawImage:image inRect:dRect fromRect:sRect];

}

- (void) drawRect:(NSRect)rect

{

    // drawBackground

    [[NSColor colorWithCalibratedRed:0.75 green:0.75 blue:0.75 alpha:1.0] set];

    [NSBezierPath fillRect:[self bounds]];

    if ([mImageDoc switchState])

        [self drawCIImage];

    else

        [self drawImage];

}

// Force a high quality update after live resizing

- (void) viewDidEndLiveResize

{

    if ([mImageDoc switchState]==NO)

        [self setNeedsDisplay:YES];

}

- (void) newScreenProfile:(NSNotification*)n

{

}

@end