/*
 * com.fc.vrml.image.ImageToSFImage
 *
 * Copyright (c) 1996-1998 Finlayson Consulting (FC). All Rights Reserved.
 *
 * FC grants you ("Licensee") a non-exclusive, royalty free, license to use,
 * modify and redistribute this software in source and binary code form,
 * provided that i) this copyright notice and license appear on all copies of
 * the software; and ii) this software is not reverse engineereed without written
 * consent.
 *
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
 * IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
 * NON-INFRINGEMENT, ARE HEREBY EXCLUDED. FC AND ITS LICENSORS SHALL NOT BE
 * LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
 * OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL FC OR ITS
 * LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
 * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
 * OR INABILITY TO USE SOFTWARE, EVEN IF FC HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 *
 * This software is not designed or intended for use in on-line control of
 * aircraft, air traffic, aircraft navigation or aircraft communications; or in
 * the design, construction, operation or maintenance of any nuclear
 * facility. Licensee represents and warrants that it will not use or
 * redistribute the Software for such purposes.
 *
 * free for use and distribution, no modification without consent
 * disclaimer
*/

package com.fc.vrml.image;

import vrml.field.SFImage;
import vrml.field.ConstSFImage;
import com.fc.vrml.image.ExternalSFImage;

/**
*  This class is an object to convert an int array of Java (tm) image pixels to a 1, 2, 3, or 4 component SFImage or ConstSFImage.  
* <P>
* Use the height, width, components, and pixel array as arguments to the methods to get VRML SFImage objects.
*  @see com.fc.vrml.image.ExternalSFImage
*  @version 0.5 
*  @author Ross A. Finlayson
*  @author <A HREF="http://www.tomco.net/~raf/vrmlgroup">FC VRML Group</A>
*/

public class ImageToSFImage extends Object{

int numComponents=4;

private byte[] fourbytes={0, 0, 0, 0};
private byte[] threebytes={0, 0, 0};
private byte[] twobytes={0, 0};
private byte[] onebyte={0};
byte[] sfpixels;

public ImageToSFImage(){

numComponents=4;

}

public ImageToSFImage(int components){

switch(components){

case 1:
numComponents=1;
break;

case 2:
numComponents=2;
break;

case 3:
numComponents=3;
break;

case 4:
numComponents=4;
break;

}

}
// use this method to convert an int array of Java (tm) image pixels to VRML 2.0 SFImage and ConstSFImage forma

/**
* This method returns SFImage object from height, width, number of color components, and pixel array from Java image source.
* @param height Height of Image
* @param width Width of Image
* @param pixels Pixel array of Image
* @return SFImage
*/


public SFImage getSFImage(int width, int height, int numComponents, int[] jpixels){

height=height;
width=width;
numComponents=numComponents;
int[] pixels=jpixels;

switch(numComponents){

case 1:

sfpixels=new byte[height*width];

for (int j=(height-1);j>-1; j--){
	for (int i=0;i<width;i++){
		System.arraycopy(pixelToBytes(pixels[j*i+j]), 0, sfpixels, ((height-j)*i+j), 1);
	}
}

return new SFImage(width, height, numComponents, sfpixels);

case 2:

sfpixels=new byte[height*width*2];

for (int j=(height-1);j>-1; j--){
	for (int i=0;i<width;i++){
		System.arraycopy(pixelToBytes(pixels[j*i+j]), 0, sfpixels, ((height-j)*i+j)*2, 2);
	}
}

return new SFImage(width, height, numComponents, sfpixels);

case 3:

sfpixels=new byte[height*width*3];

for (int j=(height-1);j>-1; j--){
	for (int i=0;i<width;i++){
		System.arraycopy(pixelToBytes(pixels[j*i+j]), 0, sfpixels, ((height-j)*i+j)*3, 3);
	}
}

return new SFImage(width, height, numComponents, sfpixels);

case 4:

sfpixels=new byte[height*width*4];

for (int j=(height-1);j>-1; j--){
	for (int i=0;i<width;i++){
		System.arraycopy(pixelToBytes(pixels[j*i+j]), 0, sfpixels, ((height-j)*i+j)*4, 4);
	}
}

return new SFImage(width, height, numComponents, sfpixels);

}

return new SFImage();

}



/**
* This method returns ConstSFImage object from height, width, number of color components, and pixel array from Java image source.
* @param height Height of Image
* @param width Width of Image
* @param pixels Pixel array of Image
* @return ConstSFImage
*/

public ConstSFImage getConstSFImage(int height, int width, int numComponents, int[] jpixels){

height=height;
width=width;
numComponents=numComponents;
int[] pixels=jpixels;

switch(numComponents){

case 1:

sfpixels=new byte[height*width];

for (int j=(height-1);j>-1; j--){
	for (int i=0;i<width;i++){
		System.arraycopy(pixelToBytes(pixels[j*i+j]), 0, sfpixels, ((height-j)*i+j), 1);
	}
}

return new ConstSFImage(width, height, numComponents, sfpixels);

case 2:

sfpixels=new byte[height*width*2];

for (int j=(height-1);j>-1; j--){
	for (int i=0;i<width;i++){
		System.arraycopy(pixelToBytes(pixels[j*i+j]), 0, sfpixels, ((height-j)*i+j)*2, 2);
	}
}

return new ConstSFImage(width, height, numComponents, sfpixels);

case 3:

sfpixels=new byte[height*width*3];

for (int j=(height-1);j>-1; j--){
	for (int i=0;i<width;i++){
		System.arraycopy(pixelToBytes(pixels[j*i+j]), 0, sfpixels, ((height-j)*i+j)*3, 3);
	}
}

return new ConstSFImage(width, height, numComponents, sfpixels);

case 4:

sfpixels=new byte[height*width*4];

for (int j=(height-1);j>-1; j--){
	for (int i=0;i<width;i++){
		System.arraycopy(pixelToBytes(pixels[j*i+j]), 0, sfpixels, ((height-j)*i+j)*4, 4);
	}
}

return new ConstSFImage(width, height, numComponents, sfpixels);

}

return new ConstSFImage(1, 1, 4, fourbytes);

}

/**
* This method returns ExternalSFImage object from height, width, number of color components, and pixel array from Java image source.
* @param height Height of Image
* @param width Width of Image
* @param pixels Pixel array of Image
* @return ExternalSFImage
*/

public ExternalSFImage getExternalSFImage(int width, int height, int numComponents, int[] jpixels){

height=height;
width=width;
numComponents=numComponents;
int[] pixels=jpixels;

switch(numComponents){

case 1:

sfpixels=new byte[height*width];

for (int j=(height-1);j>-1; j--){
	for (int i=0;i<width;i++){
		System.arraycopy(pixelToBytes(pixels[j*i+j]), 0, sfpixels, ((height-j)*i+j), 1);
	}
}

return new ExternalSFImage(width, height, numComponents, sfpixels);

case 2:

sfpixels=new byte[height*width*2];

for (int j=(height-1);j>-1; j--){
	for (int i=0;i<width;i++){
		System.arraycopy(pixelToBytes(pixels[j*i+j]), 0, sfpixels, ((height-j)*i+j)*2, 2);
	}
}

return new ExternalSFImage(width, height, numComponents, sfpixels);

case 3:
sfpixels=new byte[height*width*3];

for (int j=(height-1);j>-1; j--){
	for (int i=0;i<width;i++){
		System.arraycopy(pixelToBytes(pixels[j*i+j]), 0, sfpixels, ((height-j)*i+j)*3, 3);
	}
}

return new ExternalSFImage(width, height, numComponents, sfpixels);

case 4:

sfpixels=new byte[height*width*4];

for (int j=(height-1);j>-1; j--){
	for (int i=0;i<width;i++){
		System.arraycopy(pixelToBytes(pixels[j*i+j]), 0, sfpixels, ((height-j)*i+j)*4, 4);
	}
}

return new ExternalSFImage(width, height, numComponents, sfpixels);

}

return new ExternalSFImage();

}


// /**
// * This method converts a Java pixel from default RGB ColorModel to SFImage 4 component pixel.
// * @param pixel int pixel in default RGB format
// * @return sfpixel int pixel of 4 component SFImage pixel format
// * @deprecated
// * @see #pixelToBytes
// */


// public final static int PixelToVRMLPixel(int pixel){
// int alpha=(pixel >> 24)& 0xff;
// int red=(pixel >> 16)& 0xff;
// int green=(pixel >> 8)& 0xff;
// int blue=(pixel )& 0xff;
// int vrmlpixel=((red  << 24)| (green << 16) | (blue << 8)|(alpha));
// return vrmlpixel;
// return vrmlpixel;
// }

// */

/**
* This method returns a byte array containing the pixel data in SFImage format.  
* <P>
* For a 1 component image, this returns one byte of the image intensity.
* <P>
* For a 2 component image, this returns two bytes, the first image intensity and the second transparency.
* <P>
* For a 3 component image, this returns three bytes, the red, green, and blue intensities.
* <P>
* For a 4 component image, this returns four bytes, the red, green, and blue intensities and alpha transparency.
* <P>
* @param pixel Pixel from default Java RGB ColorModel
* @return byte array of pixel data
*/

public final byte[] pixelToBytes(int pixel){

switch(numComponents){

case 4:

fourbytes[0]= (byte)((pixel >> 16) & 0xff);//red
fourbytes[1]= (byte)((pixel >> 8) & 0xff); //green
fourbytes[2]= (byte)(pixel & 0xff); //blue
fourbytes[3]= (byte)((pixel >> 24) & 0xff); //alpha
return fourbytes;

case 3:

threebytes[0]= (byte)((pixel >> 16) & 0xff);
threebytes[1]= (byte)((pixel >> 8) & 0xff);
threebytes[2]= (byte)(pixel & 0xff);
return threebytes;

case 2:
twobytes[0]=(byte)( .2125 * ((pixel >> 16) & 0xff) + .7154 * ((pixel >> 8) & 0xff) + .0721 * (pixel & 0xff));
twobytes[1]=(byte)((pixel >> 24) & 0xff);
return twobytes;

case 1:
onebyte[0]=(byte)( .2125 * ((pixel >> 16) & 0xff) + .7154 * ((pixel >> 8) & 0xff) + .0721 * (pixel & 0xff));
return onebyte;

}

return fourbytes;
}

}