//

//  NSImage_monochrome.m

//  Black and White

//

//  Created by jcr on Wed Aug 21 2002.

//  Copyright (c) 2002 Apple Computer, Inc. All rights reserved.

//

#import "NSImage_monochrome.h"

typedef struct _monochromePixel

    { 

    unsigned char grayValue; 

    unsigned char alpha; 

    } monochromePixel;

@implementation NSImage (monochrome)

- (NSImage *) monochromeImage

    {

    NSSize 

        mySize = [self size];

    NSImage 

        *monochromeImage = [[[self class] alloc] initWithSize:mySize];

    int

        row, column, widthInPixels = mySize.width, heightInPixels = mySize.height;

        // Need a place to put the monochrome pixels.

    NSBitmapImageRep *blackAndWhiteRep = 

    [[NSBitmapImageRep alloc] 

      initWithBitmapDataPlanes: nil  // Nil pointer tells the kit to allocate the pixel buffer for us.

      pixelsWide: widthInPixels 

      pixelsHigh: heightInPixels

      bitsPerSample: 8

      samplesPerPixel: 2  

      hasAlpha: YES

      isPlanar: NO 

      colorSpaceName: NSCalibratedWhiteColorSpace // 0 = black, 1 = white in this color space.

      bytesPerRow: 0     // Passing zero means "you figure it out."

      bitsPerPixel: 16];  // This must agree with bitsPerSample and samplesPerPixel.

  monochromePixel

    *pixels = (monochromePixel *)[blackAndWhiteRep bitmapData];  // -bitmapData returns a void*, not an NSData object ;-)

    [self lockFocus]; // necessary for NSReadPixel() to work.

    for (row = 0; row < heightInPixels; row++)

        for (column = 0; column < widthInPixels; column++)

            {

            monochromePixel 

                *thisPixel = &(pixels[((widthInPixels * row) + column)]);

            NSColor 

                *pixelColor = NSReadPixel(NSMakePoint(column, heightInPixels - (row +1)));

            //  thisPixel->grayValue = 1.0 - rint(255 *      // use this line for negative..

            thisPixel->grayValue = rint(255 *   // use this line for positive...

                    (0.299 * [pixelColor redComponent]

                                 + 0.587 * [pixelColor greenComponent]

                                 + 0.114 * [pixelColor blueComponent]));

          thisPixel->alpha = ([pixelColor alphaComponent]  * 255); // handle the transparency, too

            }

    [self unlockFocus];

    [monochromeImage addRepresentation:blackAndWhiteRep];

    [blackAndWhiteRep release];

    return [monochromeImage autorelease];

    }

@end

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