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/* IndexColorModel.java -- Java class for interpreting Pixel objects
Copyright (C) 1999 Free Software Foundation, Inc.
This file is part of the non-peer AWT libraries of GNU Classpath.
This library is free software; you can redistribute it and/or modify
it under the terms of the GNU Library General Public License as published
by the Free Software Foundation, either version 2 of the License, or
(at your option) any later verion.
This library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; if not, write to the Free Software Foundation
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307 USA. */
package java.awt.image;
/**
*
* @author C. Brian Jones (cbj@gnu.org)
*/
public class IndexColorModel extends ColorModel
{
private int map_size;
private boolean opaque;
private int trans = -1;
private int[] rgb;
/**
* Each array much contain <code>size</code> elements. For each
* array, the i-th color is described by reds[i], greens[i],
* blues[i], alphas[i], unless alphas is not specified, then all the
* colors are opaque except for the transparent color.
*
* @param bits the number of bits needed to represent <code>size</code> colors
* @param size the number of colors in the color map
* @param reds the red component of all colors
* @param greens the green component of all colors
* @param blues the blue component of all colors
*/
public IndexColorModel(int bits, int size, byte[] reds, byte[] greens,
byte[] blues) {
this(bits, size, reds, greens, blues, (byte[])null);
}
/**
* Each array much contain <code>size</code> elements. For each
* array, the i-th color is described by reds[i], greens[i],
* blues[i], alphas[i], unless alphas is not specified, then all the
* colors are opaque except for the transparent color.
*
* @param bits the number of bits needed to represent <code>size</code> colors
* @param size the number of colors in the color map
* @param reds the red component of all colors
* @param greens the green component of all colors
* @param blues the blue component of all colors
* @param trans the index of the transparent color
*/
public IndexColorModel(int bits, int size, byte[] reds, byte[] greens,
byte[] blues, int trans) {
this(bits, size, reds, greens, blues, (byte[])null);
this.trans = trans;
}
/**
* Each array much contain <code>size</code> elements. For each
* array, the i-th color is described by reds[i], greens[i],
* blues[i], alphas[i], unless alphas is not specified, then all the
* colors are opaque except for the transparent color.
*
* @param bits the number of bits needed to represent <code>size</code> colors
* @param size the number of colors in the color map
* @param reds the red component of all colors
* @param greens the green component of all colors
* @param blues the blue component of all colors
* @param alphas the alpha component of all colors
*/
public IndexColorModel(int bits, int size, byte[] reds, byte[] greens,
byte[] blues, byte[] alphas) {
super(bits);
map_size = size;
opaque = (alphas == null);
rgb = new int[size];
if (alphas == null) {
for (int i = 0; i < size; i++) {
rgb[i] = 0xff000000 |
((reds[i] & 0xff) << 16) |
((greens[i] & 0xff) << 8) |
(blues[i] & 0xff);
}
}
else {
for (int i = 0; i < size; i++) {
rgb[i] = ((alphas[i] & 0xff) << 24 |
((reds[i] & 0xff) << 16) |
((greens[i] & 0xff) << 8) |
(blues[i] & 0xff));
}
}
}
/**
* Each array much contain <code>size</code> elements. For each
* array, the i-th color is described by reds[i], greens[i],
* blues[i], alphas[i], unless alphas is not specified, then all the
* colors are opaque except for the transparent color.
*
* @param bits the number of bits needed to represent <code>size</code> colors
* @param size the number of colors in the color map
* @param cmap packed color components
* @param start the offset of the first color component in <code>cmap</code>
* @param hasAlpha <code>cmap</code> has alpha values
*/
public IndexColorModel(int bits, int size, byte[] cmap, int start,
boolean hasAlpha) {
this(bits, size, cmap, start, hasAlpha, -1);
}
/**
* Each array much contain <code>size</code> elements. For each
* array, the i-th color is described by reds[i], greens[i],
* blues[i], alphas[i], unless alphas is not specified, then all the
* colors are opaque except for the transparent color.
*
* @param bits the number of bits needed to represent <code>size</code> colors
* @param size the number of colors in the color map
* @param cmap packed color components
* @param start the offset of the first color component in <code>cmap</code>
* @param hasAlpha <code>cmap</code> has alpha values
* @param trans the index of the transparent color
*/
public IndexColorModel(int bits, int size, byte[] cmap, int start,
boolean hasAlpha, int trans) {
super(bits);
map_size = size;
opaque = !hasAlpha;
this.trans = trans;
}
public final int getMapSize() {
return map_size;
}
/**
* Get the index of the transparent color in this color model
*/
public final int getTransparentPixel() {
return trans;
}
/**
* <br>
*/
public final void getReds(byte[] r) {
getComponents( r, 2 );
}
/**
* <br>
*/
public final void getGreens(byte[] g) {
getComponents( g, 1 );
}
/**
* <br>
*/
public final void getBlues(byte[] b) {
getComponents( b, 0 );
}
/**
* <br>
*/
public final void getAlphas(byte[] a) {
getComponents( a, 3 );
}
private void getComponents( byte[] c, int ci )
{
int i, max = ( map_size < c.length ) ? map_size : c.length;
for( i = 0; i < max; i++ )
c[i] = (byte)(( generateMask( ci ) & rgb[i]) >> ( ci * pixel_bits) );
}
/**
* Get the red component of the given pixel.
* <br>
*/
public final int getRed(int pixel) {
if( pixel < map_size )
return (int)(( generateMask( 2 ) & rgb[pixel]) >> (2 * pixel_bits ) );
return 0;
}
/**
* Get the green component of the given pixel.
* <br>
*/
public final int getGreen(int pixel) {
if( pixel < map_size )
return (int)(( generateMask( 1 ) & rgb[pixel]) >> (1 * pixel_bits ) );
return 0;
}
/**
* Get the blue component of the given pixel.
* <br>
*/
public final int getBlue(int pixel) {
if( pixel < map_size )
return (int)( generateMask( 0 ) & rgb[pixel]);
return 0;
}
/**
* Get the alpha component of the given pixel.
* <br>
*/
public final int getAlpha(int pixel) {
if( pixel < map_size )
return (int)(( generateMask( 3 ) & rgb[pixel]) >> (3 * pixel_bits ) );
return 0;
}
/**
* Get the RGB color value of the given pixel using the default
* RGB color model.
* <br>
*
* @param pixel a pixel value
*/
public final int getRGB(int pixel) {
if( pixel < map_size )
return rgb[pixel];
return 0;
}
//pixel_bits is number of bits to be in generated mask
private int generateMask( int offset )
{
return ( ( ( 2 << pixel_bits ) - 1 ) << ( pixel_bits * offset ) );
}
}
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