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/* Copyright © 2000 Free Software Foundation
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
package java.awt.image;
import java.awt.Point;
import java.awt.color.ColorSpace;
import gnu.gcj.awt.BitMaskExtent;
/**
* @author Rolf W. Rasmussen <rolfwr@ii.uib.no>
*/
public abstract class PackedColorModel extends ColorModel
{
private int masks[];
/* Package accessibility, the DirectColorModel needs this array */
int shifts[];
public PackedColorModel(ColorSpace cspace, int pixelBits,
int[] colorMaskArray, int alphaMask,
boolean isAlphaPremultiplied,
int transparency,
int transferType)
{
super(pixelBits, calcBitsPerComponent(colorMaskArray, alphaMask),
cspace, (alphaMask != 0), isAlphaPremultiplied, transparency,
transferType);
initMasks(colorMaskArray, alphaMask);
if ((pixelBits<1) || (pixelBits>32)) {
throw new IllegalArgumentException("pixels per bits must be " +
"in the range [1, 32]");
}
}
private static int[] calcBitsPerComponent(int[] colorMaskArray,
int alphaMask)
{
int numComponents = colorMaskArray.length;
if (alphaMask != 0) numComponents++;
int[] bitsPerComponent = new int[numComponents];
BitMaskExtent extent = new BitMaskExtent();
for (int b=0; b<colorMaskArray.length; b++)
{
extent.setMask(colorMaskArray[b]);
bitsPerComponent[b] = extent.bitWidth;
}
if (alphaMask != 0)
{
extent.setMask(alphaMask);
bitsPerComponent[numComponents-1] = extent.bitWidth;
}
return bitsPerComponent;
}
/** Initializes the masks.
*
* @return an array containing the number of bits per color
* component.
*/
private void initMasks(int[] colorMaskArray, int alphaMask)
{
int numComponents = colorMaskArray.length;
if (alphaMask == 0)
{
masks = colorMaskArray;
}
else
{
masks = new int[numComponents+1];
System.arraycopy(colorMaskArray, 0,
masks, 0,
numComponents);
masks[numComponents++] = alphaMask;
}
shifts = new int[numComponents];
// Bit field handling have been moved to a utility class
BitMaskExtent extent = new BitMaskExtent();
for (int b=0; b<numComponents; b++)
{
extent.setMask(masks[b]);
shifts[b] = extent.leastSignificantBit;
}
}
public PackedColorModel(ColorSpace cspace, int pixelBits,
int rmask, int gmask, int bmask,
int amask, boolean isAlphaPremultiplied,
int transparency,
int transferType)
{
this(cspace, pixelBits, makeColorMaskArray(rmask, gmask, bmask),
amask, isAlphaPremultiplied, transparency, transferType);
}
/* TODO: If there is a alpha mask, it is inefficient to create a
color mask array that will be discarded when the alpha mask is
appended. We should probably create a private constructor that
takes a complete array of masks (color+alpha) as an
argument. */
private static int[] makeColorMaskArray(int rmask, int gmask, int bmask)
{
int[] colorMaskArray = { rmask, gmask, bmask };
return colorMaskArray;
}
public final int getMask(int index)
{
return masks[index];
}
public final int[] getMasks()
{
return masks;
}
public SampleModel createCompatibleSampleModel(int w, int h)
{
return new SinglePixelPackedSampleModel(transferType, w, h, masks);
}
public boolean isCompatibleSampleModel(SampleModel sm)
{
if (!super.isCompatibleSampleModel(sm)) return false;
if (!(sm instanceof SinglePixelPackedSampleModel)) return false;
SinglePixelPackedSampleModel sppsm =
(SinglePixelPackedSampleModel) sm;
return java.util.Arrays.equals(sppsm.getBitMasks(), masks);
}
public WritableRaster getAlphaRaster(WritableRaster raster) {
if (!hasAlpha()) return null;
SampleModel sm = raster.getSampleModel();
int[] alphaBand = { sm.getNumBands() - 1 };
SampleModel alphaModel = sm.createSubsetSampleModel(alphaBand);
DataBuffer buffer = raster.getDataBuffer();
Point origin = new Point(0, 0);
return Raster.createWritableRaster(alphaModel, buffer, origin);
}
public boolean equals(Object obj)
{
if (!super.equals(obj)) return false;
if (!(obj instanceof PackedColorModel)) return false;
PackedColorModel other = (PackedColorModel) obj;
return java.util.Arrays.equals(masks, other.masks);
}
}
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