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jlechner |
/* ColorModel.java --
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Copyright (C) 1999, 2000, 2002, 2003, 2004 Free Software Foundation
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.awt.image;
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import gnu.java.awt.Buffers;
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import java.awt.Point;
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import java.awt.Transparency;
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import java.awt.color.ColorSpace;
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import java.lang.reflect.Constructor;
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import java.util.Arrays;
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/**
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* A color model operates with colors in several formats:
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*
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* <ul>
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* <li>normalized: component samples are in range [0.0, 1.0].</li>
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*
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* <li>color model pixel value: all the color component samples for a
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* sigle pixel packed/encoded in a way natural for the color
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* model.</li>
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*
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* <li>color model pixel int value: only makes sense if the natural
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* encoding of a single pixel can fit in a single int value.</li>
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*
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* <li>array of transferType containing a single pixel: the pixel is
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* encoded in the natural way of the color model, taking up as many
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* array elements as needed.</li>
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*
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* <li>sRGB pixel int value: a pixel in sRGB color space, encoded in
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* default 0xAARRGGBB format, assumed not alpha premultiplied.</li>
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*
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* <li>single [0, 255] scaled int samples from default sRGB color
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* space. These are always assumed to be alpha non-premultiplied.</li>
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*
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* <li>arrays of unnormalized component samples of single pixel: these
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* samples are scaled and multiplied according to the color model, but
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* is otherwise not packed or encoded. Each element of the array is one
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* separate component sample. The color model only operate on the
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* components from one pixel at a time, but using offsets, allows
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* manipulation of arrays that contain the components of more than one
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* pixel.</li>
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*
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* </ul>
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*
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* @author Rolf W. Rasmussen (rolfwr@ii.uib.no)
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* @author C. Brian Jones (cbj@gnu.org)
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*/
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public abstract class ColorModel implements Transparency
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{
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protected int pixel_bits;
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protected int transferType;
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int[] bits;
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ColorSpace cspace;
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int transparency;
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boolean hasAlpha;
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boolean isAlphaPremultiplied;
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static int[] nArray(int value, int times)
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{
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int[] array = new int[times];
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java.util.Arrays.fill(array, value);
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return array;
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}
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static byte[] nArray(byte value, int times)
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{
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byte[] array = new byte[times];
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java.util.Arrays.fill(array, value);
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return array;
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}
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/**
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* Constructs the default color model. The default color model
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* can be obtained by calling <code>getRGBdefault</code> of this
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* class.
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* @param bits the number of bits wide used for bit size of pixel values
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*/
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public ColorModel(int bits)
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{
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this(bits * 4, // total bits, sRGB, four channels
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nArray(bits, 4), // bits for each channel
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ColorSpace.getInstance(ColorSpace.CS_sRGB), // sRGB
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true, // has alpha
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false, // not premultiplied
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TRANSLUCENT,
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Buffers.smallestAppropriateTransferType(bits * 4));
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}
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/**
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* Constructs a ColorModel that translates pixel values to
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* color/alpha components.
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*
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* @exception IllegalArgumentException If the length of the bit array is less
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* than the number of color or alpha components in this ColorModel, or if the
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* transparency is not a valid value, or if the sum of the number of bits in
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* bits is less than 1 or if any of the elements in bits is less than 0.
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*/
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protected ColorModel(int pixel_bits, int[] bits, ColorSpace cspace,
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boolean hasAlpha, boolean isAlphaPremultiplied,
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int transparency, int transferType)
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{
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int bits_sum = 0;
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for (int i = 0; i < bits.length; i++)
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{
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if (bits [i] < 0)
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throw new IllegalArgumentException ();
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bits_sum |= bits [i];
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}
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if ((bits.length < cspace.getNumComponents())
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|| (bits_sum < 1))
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throw new IllegalArgumentException ();
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this.pixel_bits = pixel_bits;
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this.bits = bits;
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this.cspace = cspace;
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this.hasAlpha = hasAlpha;
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this.isAlphaPremultiplied = isAlphaPremultiplied;
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this.transparency = transparency;
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this.transferType = transferType;
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}
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// This is a hook for ColorConvertOp to create a colormodel with
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// a new colorspace
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ColorModel cloneColorModel(ColorSpace cspace)
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{
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Class cls = this.getClass();
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ColorModel cm;
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try {
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// This constructor will exist.
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Constructor ctor =
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cls.getConstructor(new Class[]{int.class, int[].class,
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ColorSpace.class, boolean.class,
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boolean.class, int.class, int.class});
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cm = (ColorModel)ctor.
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newInstance(new Object[]{new Integer(pixel_bits),
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bits, cspace, Boolean.valueOf(hasAlpha),
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Boolean.valueOf(isAlphaPremultiplied),
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new Integer(transparency),
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new Integer(transferType)});
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}
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catch (Exception e)
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{
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throw new IllegalArgumentException();
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}
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return cm;
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}
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public void finalize()
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{
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// Do nothing here.
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}
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/**
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* Returns the default color model which in Sun's case is an instance
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* of <code>DirectColorModel</code>.
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*/
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public static ColorModel getRGBdefault()
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{
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return new DirectColorModel(32, 0xff0000, 0xff00, 0xff, 0xff000000);
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}
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public final boolean hasAlpha()
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{
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return hasAlpha;
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}
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public final boolean isAlphaPremultiplied()
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{
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return isAlphaPremultiplied;
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}
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/**
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* Get get number of bits wide used for the bit size of pixel values
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*/
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public int getPixelSize()
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{
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return pixel_bits;
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}
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public int getComponentSize(int componentIdx)
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{
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return bits[componentIdx];
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}
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public int[] getComponentSize()
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{
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return bits;
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}
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public int getTransparency()
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{
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return transparency;
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}
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public int getNumComponents()
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{
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return getNumColorComponents() + (hasAlpha ? 1 : 0);
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}
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public int getNumColorComponents()
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{
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return cspace.getNumComponents();
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}
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/**
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* Converts pixel value to sRGB and extract red int sample scaled
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* to range [0, 255].
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*
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* @param pixel pixel value that will be interpreted according to
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* the color model, (assumed alpha premultiplied if color model says
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* so.)
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*
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* @return red sample scaled to range [0, 255], from default color
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* space sRGB, alpha non-premultiplied.
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*/
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public abstract int getRed(int pixel);
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/**
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* Converts pixel value to sRGB and extract green int sample
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* scaled to range [0, 255].
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*
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* @see #getRed(int)
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*/
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public abstract int getGreen(int pixel);
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/**
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* Converts pixel value to sRGB and extract blue int sample
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* scaled to range [0, 255].
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*
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* @see #getRed(int)
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*/
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public abstract int getBlue(int pixel);
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/**
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* Extract alpha int sample from pixel value, scaled to [0, 255].
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*
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* @param pixel pixel value that will be interpreted according to
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* the color model.
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*
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* @return alpha sample, scaled to range [0, 255].
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*/
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public abstract int getAlpha(int pixel);
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/**
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* Converts a pixel int value of the color space of the color
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* model to a sRGB pixel int value.
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*
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* This method is typically overriden in subclasses to provide a
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* more efficient implementation.
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*
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* @param pixel pixel value that will be interpreted according to
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* the color model.
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*
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* @return a pixel in sRGB color space, encoded in default
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* 0xAARRGGBB format. */
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public int getRGB(int pixel)
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{
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return
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((getAlpha(pixel) & 0xff) << 24) |
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(( getRed(pixel) & 0xff) << 16) |
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((getGreen(pixel) & 0xff) << 8) |
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(( getBlue(pixel) & 0xff) << 0);
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}
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/**
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* In this color model we know that the whole pixel value will
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* always be contained within the first element of the pixel
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* array.
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*/
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final int getPixelFromArray(Object inData) {
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DataBuffer data =
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Buffers.createBufferFromData(transferType, inData, 1);
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Object da = Buffers.getData(data);
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return data.getElem(0);
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}
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/**
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* Converts pixel in the given array to sRGB and extract blue int
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* sample scaled to range [0-255].
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*
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* This method is typically overriden in subclasses to provide a
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* more efficient implementation.
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*
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* @param inData array of transferType containing a single pixel. The
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* pixel should be encoded in the natural way of the color model.
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*/
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public int getRed(Object inData)
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{
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return getRed(getPixelFromArray(inData));
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}
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/**
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* @see #getRed(Object)
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*/
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public int getGreen(Object inData)
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{
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return getGreen(getPixelFromArray(inData));
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}
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/**
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* @see #getRed(Object)
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*/
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public int getBlue(Object inData) {
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return getBlue(getPixelFromArray(inData));
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}
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/**
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* @see #getRed(Object)
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*/
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public int getAlpha(Object inData) {
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return getAlpha(getPixelFromArray(inData));
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}
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/**
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* Converts a pixel in the given array of the color space of the
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* color model to an sRGB pixel int value.
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*
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* <p>This method performs the inverse function of
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* <code>getDataElements(int rgb, Object pixel)</code>.
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* I.e. <code>(rgb == cm.getRGB(cm.getDataElements(rgb,
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* null)))</code>.
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*
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* @param inData array of transferType containing a single pixel. The
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* pixel should be encoded in the natural way of the color model.
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*
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* @return a pixel in sRGB color space, encoded in default
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* 0xAARRGGBB format.
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*
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* @see #getDataElements(int, Object)
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*/
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public int getRGB(Object inData)
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{
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return
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((getAlpha(inData) & 0xff) << 24) |
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(( getRed(inData) & 0xff) << 16) |
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((getGreen(inData) & 0xff) << 8) |
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(( getBlue(inData) & 0xff) << 0);
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|
|
}
|
381 |
|
|
|
382 |
|
|
/**
|
383 |
|
|
* Converts an sRGB pixel int value to an array containing a
|
384 |
|
|
* single pixel of the color space of the color model.
|
385 |
|
|
*
|
386 |
|
|
* <p>This method performs the inverse function of
|
387 |
|
|
* <code>getRGB(Object inData)</code>.
|
388 |
|
|
*
|
389 |
|
|
* Outline of conversion process:
|
390 |
|
|
*
|
391 |
|
|
* <ol>
|
392 |
|
|
*
|
393 |
|
|
* <li>Convert rgb to normalized [0.0, 1.0] sRGB values.</li>
|
394 |
|
|
*
|
395 |
|
|
* <li>Convert to color space components using fromRGB in
|
396 |
|
|
* ColorSpace.</li>
|
397 |
|
|
*
|
398 |
|
|
* <li>If color model has alpha and should be premultiplied,
|
399 |
|
|
* multiply color space components with alpha value</li>
|
400 |
|
|
*
|
401 |
|
|
* <li>Scale the components to the correct number of bits.</li>
|
402 |
|
|
*
|
403 |
|
|
* <li>Arrange the components in the output array</li>
|
404 |
|
|
*
|
405 |
|
|
* </ol>
|
406 |
|
|
*
|
407 |
|
|
* @param rgb The color to be converted to dataElements. A pixel
|
408 |
|
|
* in sRGB color space, encoded in default 0xAARRGGBB format,
|
409 |
|
|
* assumed not alpha premultiplied.
|
410 |
|
|
*
|
411 |
|
|
* @param pixel to avoid needless creation of arrays, an array to
|
412 |
|
|
* use to return the pixel can be given. If null, a suitable array
|
413 |
|
|
* will be created.
|
414 |
|
|
*
|
415 |
|
|
* @return An array of transferType values representing the color,
|
416 |
|
|
* in the color model format. The color model defines whether the
|
417 |
|
|
*
|
418 |
|
|
* @see #getRGB(Object)
|
419 |
|
|
*/
|
420 |
|
|
public Object getDataElements(int rgb, Object pixel)
|
421 |
|
|
{
|
422 |
|
|
// subclasses has to implement this method.
|
423 |
|
|
throw new UnsupportedOperationException();
|
424 |
|
|
}
|
425 |
|
|
|
426 |
|
|
/**
|
427 |
|
|
* Fills an array with the unnormalized component samples from a
|
428 |
|
|
* pixel value. I.e. decompose the pixel, but not perform any
|
429 |
|
|
* color conversion.
|
430 |
|
|
*
|
431 |
|
|
* This method is typically overriden in subclasses to provide a
|
432 |
|
|
* more efficient implementation.
|
433 |
|
|
*
|
434 |
|
|
* @param pixel pixel value encoded according to the color model.
|
435 |
|
|
*
|
436 |
|
|
* @return arrays of unnormalized component samples of single
|
437 |
|
|
* pixel. The scale and multiplication state of the samples are
|
438 |
|
|
* according to the color model. Each component sample is stored
|
439 |
|
|
* as a separate element in the array.
|
440 |
|
|
*/
|
441 |
|
|
public int[] getComponents(int pixel, int[] components, int offset)
|
442 |
|
|
{
|
443 |
|
|
// subclasses has to implement this method.
|
444 |
|
|
throw new UnsupportedOperationException();
|
445 |
|
|
}
|
446 |
|
|
|
447 |
|
|
/**
|
448 |
|
|
* Fills an array with the unnormalized component samples from an
|
449 |
|
|
* array of transferType containing a single pixel. I.e. decompose
|
450 |
|
|
* the pixel, but not perform any color conversion.
|
451 |
|
|
*
|
452 |
|
|
* This method is typically overriden in subclasses to provide a
|
453 |
|
|
* more efficient implementation.
|
454 |
|
|
*
|
455 |
|
|
* @param array of transferType containing a single pixel. The
|
456 |
|
|
* pixel should be encoded in the natural way of the color model.
|
457 |
|
|
*
|
458 |
|
|
* @return arrays of unnormalized component samples of single
|
459 |
|
|
* pixel. The scale and multiplication state of the samples are
|
460 |
|
|
* according to the color model. Each component sample is stored
|
461 |
|
|
* as a separate element in the array.
|
462 |
|
|
*/
|
463 |
|
|
public int[] getComponents(Object pixel, int[] components, int offset)
|
464 |
|
|
{
|
465 |
|
|
// subclasses has to implement this method.
|
466 |
|
|
throw new UnsupportedOperationException();
|
467 |
|
|
}
|
468 |
|
|
|
469 |
|
|
/**
|
470 |
|
|
* Convert normalized components to unnormalized components.
|
471 |
|
|
*/
|
472 |
|
|
public int[] getUnnormalizedComponents(float[] normComponents,
|
473 |
|
|
int normOffset,
|
474 |
|
|
int[] components,
|
475 |
|
|
int offset)
|
476 |
|
|
{
|
477 |
|
|
int numComponents = getNumComponents();
|
478 |
|
|
if (components == null)
|
479 |
|
|
{
|
480 |
|
|
components = new int[offset + numComponents];
|
481 |
|
|
}
|
482 |
|
|
|
483 |
|
|
for (int i=0; i<numComponents; i++)
|
484 |
|
|
{
|
485 |
|
|
float in = normComponents[normOffset++];
|
486 |
|
|
int out = (int) (in * ((1<<getComponentSize(i)) - 1));
|
487 |
|
|
components[offset++] = out;
|
488 |
|
|
}
|
489 |
|
|
return components;
|
490 |
|
|
}
|
491 |
|
|
|
492 |
|
|
/**
|
493 |
|
|
* Convert unnormalized components to normalized components.
|
494 |
|
|
*/
|
495 |
|
|
public float[] getNormalizedComponents(int[] components,
|
496 |
|
|
int offset,
|
497 |
|
|
float[] normComponents,
|
498 |
|
|
int normOffset)
|
499 |
|
|
{
|
500 |
|
|
int numComponents = getNumComponents();
|
501 |
|
|
if (normComponents == null)
|
502 |
|
|
{
|
503 |
|
|
normComponents = new float[normOffset + numComponents];
|
504 |
|
|
}
|
505 |
|
|
|
506 |
|
|
for (int i=0; i<numComponents; i++)
|
507 |
|
|
{
|
508 |
|
|
float in = components[offset++];
|
509 |
|
|
float out = in / ((1<<getComponentSize(i)) - 1);
|
510 |
|
|
normComponents[normOffset++] = out;
|
511 |
|
|
}
|
512 |
|
|
return normComponents;
|
513 |
|
|
}
|
514 |
|
|
|
515 |
|
|
/**
|
516 |
|
|
* Convert unnormalized components to normalized components.
|
517 |
|
|
*
|
518 |
|
|
* @since 1.4
|
519 |
|
|
*/
|
520 |
|
|
public float[] getNormalizedComponents (Object pixel,
|
521 |
|
|
float[] normComponents,
|
522 |
|
|
int normOffset)
|
523 |
|
|
{
|
524 |
|
|
// subclasses has to implement this method.
|
525 |
|
|
throw new UnsupportedOperationException();
|
526 |
|
|
}
|
527 |
|
|
|
528 |
|
|
/**
|
529 |
|
|
* Converts the unnormalized component samples from an array to a
|
530 |
|
|
* pixel value. I.e. composes the pixel from component samples, but
|
531 |
|
|
* does not perform any color conversion or scaling of the samples.
|
532 |
|
|
*
|
533 |
|
|
* This method performs the inverse function of
|
534 |
|
|
* <code>getComponents(int pixel, int[] components,
|
535 |
|
|
* int offset)</code>. I.e.
|
536 |
|
|
*
|
537 |
|
|
* <code>(pixel == cm.getDataElement(cm.getComponents(pixel, null,
|
538 |
|
|
* 0), 0))</code>.
|
539 |
|
|
*
|
540 |
|
|
* This method is overriden in subclasses since this abstract class throws
|
541 |
|
|
* UnsupportedOperationException().
|
542 |
|
|
*
|
543 |
|
|
* @param components Array of unnormalized component samples of single
|
544 |
|
|
* pixel. The scale and multiplication state of the samples are according
|
545 |
|
|
* to the color model. Each component sample is stored as a separate element
|
546 |
|
|
* in the array.
|
547 |
|
|
* @param offset Position of the first value of the pixel in components.
|
548 |
|
|
*
|
549 |
|
|
* @return pixel value encoded according to the color model.
|
550 |
|
|
*/
|
551 |
|
|
public int getDataElement(int[] components, int offset)
|
552 |
|
|
{
|
553 |
|
|
// subclasses have to implement this method.
|
554 |
|
|
throw new UnsupportedOperationException();
|
555 |
|
|
}
|
556 |
|
|
|
557 |
|
|
/**
|
558 |
|
|
* Converts the normalized component samples from an array to a pixel
|
559 |
|
|
* value. I.e. composes the pixel from component samples, but does not
|
560 |
|
|
* perform any color conversion or scaling of the samples.
|
561 |
|
|
*
|
562 |
|
|
* This method is typically overriden in subclasses to provide a
|
563 |
|
|
* more efficient implementation. The method provided by this abstract
|
564 |
|
|
* class converts the components to unnormalized form and returns
|
565 |
|
|
* getDataElement(int[], int).
|
566 |
|
|
*
|
567 |
|
|
* @param components Array of normalized component samples of single pixel.
|
568 |
|
|
* The scale and multiplication state of the samples are according to the
|
569 |
|
|
* color model. Each component sample is stored as a separate element in the
|
570 |
|
|
* array.
|
571 |
|
|
* @param offset Position of the first value of the pixel in components.
|
572 |
|
|
*
|
573 |
|
|
* @return pixel value encoded according to the color model.
|
574 |
|
|
* @since 1.4
|
575 |
|
|
*/
|
576 |
|
|
public int getDataElement (float[] components, int offset)
|
577 |
|
|
{
|
578 |
|
|
return
|
579 |
|
|
getDataElement(getUnnormalizedComponents(components, offset, null, 0),
|
580 |
|
|
0);
|
581 |
|
|
}
|
582 |
|
|
|
583 |
|
|
public Object getDataElements(int[] components, int offset, Object obj)
|
584 |
|
|
{
|
585 |
|
|
// subclasses have to implement this method.
|
586 |
|
|
throw new UnsupportedOperationException();
|
587 |
|
|
}
|
588 |
|
|
|
589 |
|
|
/**
|
590 |
|
|
* Converts the normalized component samples from an array to an array of
|
591 |
|
|
* TransferType values. I.e. composes the pixel from component samples, but
|
592 |
|
|
* does not perform any color conversion or scaling of the samples.
|
593 |
|
|
*
|
594 |
|
|
* If obj is null, a new array of TransferType is allocated and returned.
|
595 |
|
|
* Otherwise the results are stored in obj and obj is returned. If obj is
|
596 |
|
|
* not long enough, ArrayIndexOutOfBounds is thrown. If obj is not an array
|
597 |
|
|
* of primitives, ClassCastException is thrown.
|
598 |
|
|
*
|
599 |
|
|
* This method is typically overriden in subclasses to provide a
|
600 |
|
|
* more efficient implementation. The method provided by this abstract
|
601 |
|
|
* class converts the components to unnormalized form and returns
|
602 |
|
|
* getDataElement(int[], int, Object).
|
603 |
|
|
*
|
604 |
|
|
* @param components Array of normalized component samples of single pixel.
|
605 |
|
|
* The scale and multiplication state of the samples are according to the
|
606 |
|
|
* color model. Each component sample is stored as a separate element in the
|
607 |
|
|
* array.
|
608 |
|
|
* @param offset Position of the first value of the pixel in components.
|
609 |
|
|
* @param obj Array of TransferType or null.
|
610 |
|
|
*
|
611 |
|
|
* @return pixel value encoded according to the color model.
|
612 |
|
|
* @throws ArrayIndexOutOfBoundsException
|
613 |
|
|
* @throws ClassCastException
|
614 |
|
|
* @since 1.4
|
615 |
|
|
*/
|
616 |
|
|
public Object getDataElements(float[] components, int offset, Object obj)
|
617 |
|
|
{
|
618 |
|
|
return
|
619 |
|
|
getDataElements(getUnnormalizedComponents(components, offset, null, 0),
|
620 |
|
|
0, obj);
|
621 |
|
|
}
|
622 |
|
|
|
623 |
|
|
public boolean equals(Object obj)
|
624 |
|
|
{
|
625 |
|
|
if (!(obj instanceof ColorModel)) return false;
|
626 |
|
|
|
627 |
|
|
ColorModel o = (ColorModel) obj;
|
628 |
|
|
return
|
629 |
|
|
(pixel_bits == o.pixel_bits) &&
|
630 |
|
|
(transferType == o.transferType) &&
|
631 |
|
|
(transparency == o.transparency) &&
|
632 |
|
|
(hasAlpha == o.hasAlpha) &&
|
633 |
|
|
(isAlphaPremultiplied == o.isAlphaPremultiplied) &&
|
634 |
|
|
Arrays.equals(bits, o.bits) &&
|
635 |
|
|
(cspace.equals(o.cspace));
|
636 |
|
|
}
|
637 |
|
|
|
638 |
|
|
public final ColorSpace getColorSpace()
|
639 |
|
|
{
|
640 |
|
|
return cspace;
|
641 |
|
|
}
|
642 |
|
|
|
643 |
|
|
// Typically overridden
|
644 |
|
|
public ColorModel coerceData(WritableRaster raster,
|
645 |
|
|
boolean isAlphaPremultiplied)
|
646 |
|
|
{
|
647 |
|
|
if (this.isAlphaPremultiplied == isAlphaPremultiplied)
|
648 |
|
|
return this;
|
649 |
|
|
|
650 |
|
|
int w = raster.getWidth();
|
651 |
|
|
int h = raster.getHeight();
|
652 |
|
|
int x = raster.getMinX();
|
653 |
|
|
int y = raster.getMinY();
|
654 |
|
|
int size = w*h;
|
655 |
|
|
int numColors = getNumColorComponents();
|
656 |
|
|
int numComponents = getNumComponents();
|
657 |
|
|
int alphaScale = (1<<getComponentSize(numColors)) - 1;
|
658 |
|
|
double[] pixels = raster.getPixels(x, y, w, h, (double[]) null);
|
659 |
|
|
|
660 |
|
|
for (int i=0; i<size; i++)
|
661 |
|
|
{
|
662 |
|
|
double alpha = pixels[i*numComponents+numColors]*alphaScale;
|
663 |
|
|
for (int c=0; c<numColors; c++)
|
664 |
|
|
{
|
665 |
|
|
int offset = i*numComponents+c;
|
666 |
|
|
if (isAlphaPremultiplied)
|
667 |
|
|
pixels[offset] = pixels[offset]/alpha;
|
668 |
|
|
else
|
669 |
|
|
pixels[offset] = pixels[offset]*alpha;
|
670 |
|
|
}
|
671 |
|
|
}
|
672 |
|
|
|
673 |
|
|
raster.setPixels(0, 0, w, h, pixels);
|
674 |
|
|
|
675 |
|
|
// FIXME: what can we return?
|
676 |
|
|
return null;
|
677 |
|
|
}
|
678 |
|
|
|
679 |
|
|
/**
|
680 |
|
|
* Checks if the given raster has a compatible data-layout (SampleModel).
|
681 |
|
|
* @param raster The Raster to test.
|
682 |
|
|
* @return true if raster is compatible.
|
683 |
|
|
*/
|
684 |
|
|
public boolean isCompatibleRaster(Raster raster)
|
685 |
|
|
{
|
686 |
|
|
SampleModel sampleModel = raster.getSampleModel();
|
687 |
|
|
return isCompatibleSampleModel(sampleModel);
|
688 |
|
|
}
|
689 |
|
|
|
690 |
|
|
// Typically overridden
|
691 |
|
|
public WritableRaster createCompatibleWritableRaster(int w, int h)
|
692 |
|
|
{
|
693 |
|
|
return new WritableRaster(createCompatibleSampleModel(w, h),
|
694 |
|
|
new Point(0, 0));
|
695 |
|
|
}
|
696 |
|
|
|
697 |
|
|
// Typically overridden
|
698 |
|
|
public SampleModel createCompatibleSampleModel(int w, int h)
|
699 |
|
|
{
|
700 |
|
|
throw new UnsupportedOperationException();
|
701 |
|
|
}
|
702 |
|
|
|
703 |
|
|
// Typically overridden
|
704 |
|
|
public boolean isCompatibleSampleModel(SampleModel sm)
|
705 |
|
|
{
|
706 |
|
|
return sm.getTransferType() == transferType;
|
707 |
|
|
}
|
708 |
|
|
|
709 |
|
|
public final int getTransferType ()
|
710 |
|
|
{
|
711 |
|
|
return transferType;
|
712 |
|
|
}
|
713 |
|
|
|
714 |
|
|
/**
|
715 |
|
|
* Subclasses must override this method if it is possible for the
|
716 |
|
|
* color model to have an alpha channel.
|
717 |
|
|
*
|
718 |
|
|
* @return null, as per JDK 1.3 doc. Subclasses will only return
|
719 |
|
|
* null if no alpha raster exists.
|
720 |
|
|
*/
|
721 |
|
|
public WritableRaster getAlphaRaster(WritableRaster raster)
|
722 |
|
|
{
|
723 |
|
|
return null;
|
724 |
|
|
|
725 |
|
|
/* It is a mystery to me why we couldn't use the following code...
|
726 |
|
|
|
727 |
|
|
|
728 |
|
|
if (!hasAlpha()) return null;
|
729 |
|
|
|
730 |
|
|
SampleModel sm = raster.getSampleModel();
|
731 |
|
|
int[] alphaBand = { sm.getNumBands() - 1 };
|
732 |
|
|
SampleModel alphaModel = sm.createSubsetSampleModel(alphaBand);
|
733 |
|
|
DataBuffer buffer = raster.getDataBuffer();
|
734 |
|
|
Point origin = new Point(0, 0);
|
735 |
|
|
return Raster.createWritableRaster(alphaModel, buffer, origin);
|
736 |
|
|
|
737 |
|
|
|
738 |
|
|
...here, and avoided overriding the method in subclasses,
|
739 |
|
|
but the Sun docs state that this method always will return
|
740 |
|
|
null, and that overriding is required. Oh, well.
|
741 |
|
|
*/
|
742 |
|
|
}
|
743 |
|
|
|
744 |
|
|
String stringParam()
|
745 |
|
|
{
|
746 |
|
|
return "pixel_bits=" + pixel_bits +
|
747 |
|
|
", cspace=" + cspace +
|
748 |
|
|
", transferType=" + transferType +
|
749 |
|
|
", transparency=" + transparency +
|
750 |
|
|
", hasAlpha=" + hasAlpha +
|
751 |
|
|
", isAlphaPremultiplied=" + isAlphaPremultiplied;
|
752 |
|
|
}
|
753 |
|
|
|
754 |
|
|
public String toString()
|
755 |
|
|
{
|
756 |
|
|
return getClass().getName() + "[" + stringParam() + "]";
|
757 |
|
|
}
|
758 |
|
|
}
|