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jlechner |
/* DirectColorModel.java --
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Copyright (C) 1999, 2000, 2002, 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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/**
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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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* @author Mark Benvenuto (mcb54@columbia.edu)
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*/
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public class DirectColorModel extends PackedColorModel
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{
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/**
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* For the color model created with this constructor the pixels
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* will have fully opaque alpha components with a value of 255.
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* Each mask should describe a fully contiguous set of bits in the
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* most likely order of alpha, red, green, blue from the most significant
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* byte to the least significant byte.
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*
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* @param pixelBits the number of bits wide used for bit size of pixel values
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* @param rmask the bits describing the red component of a pixel
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* @param gmask the bits describing the green component of a pixel
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* @param bmask the bits describing the blue component of a pixel
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*/
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public DirectColorModel(int pixelBits, int rmask, int gmask, int bmask)
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{
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this(ColorSpace.getInstance(ColorSpace.CS_sRGB), pixelBits,
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rmask, gmask, bmask, 0,
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false, // not alpha premultiplied
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Buffers.smallestAppropriateTransferType(pixelBits) // find type
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);
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}
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/**
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* For the color model created with this constructor the pixels
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* will have fully opaque alpha components with a value of 255.
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* Each mask should describe a fully contiguous set of bits in the
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* most likely order of red, green, blue from the most significant
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* byte to the least significant byte.
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*
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* @param pixelBits the number of bits wide used for bit size of pixel values
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* @param rmask the bits describing the red component of a pixel
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* @param gmask the bits describing the green component of a pixel
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* @param bmask the bits describing the blue component of a pixel
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* @param amask the bits describing the alpha component of a pixel
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*/
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public DirectColorModel(int pixelBits,
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int rmask, int gmask, int bmask, int amask)
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{
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this(ColorSpace.getInstance(ColorSpace.CS_sRGB), pixelBits,
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rmask, gmask, bmask, amask,
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false, // not alpha premultiplied
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Buffers.smallestAppropriateTransferType(pixelBits) // find type
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);
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}
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public DirectColorModel(ColorSpace cspace, int pixelBits,
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int rmask, int gmask, int bmask, int amask,
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boolean isAlphaPremultiplied,
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int transferType)
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{
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super(cspace, pixelBits,
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rmask, gmask, bmask, amask, isAlphaPremultiplied,
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((amask == 0) ? Transparency.OPAQUE : Transparency.TRANSLUCENT),
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transferType);
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}
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public final int getRedMask()
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{
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return getMask(0);
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}
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public final int getGreenMask()
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{
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return getMask(1);
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}
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public final int getBlueMask()
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{
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return getMask(2);
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}
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public final int getAlphaMask()
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{
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return hasAlpha() ? getMask(3) : 0;
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}
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/**
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* Get the red component of the given pixel.
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* <br>
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*/
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public final int getRed(int pixel)
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{
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return extractAndNormalizeSample(pixel, 0);
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}
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/**
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* Get the green component of the given pixel.
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* <br>
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*/
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public final int getGreen(int pixel)
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{
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return extractAndNormalizeSample(pixel, 1);
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}
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/**
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* Get the blue component of the given pixel.
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* <br>
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*/
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public final int getBlue(int pixel)
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{
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return extractAndNormalizeSample(pixel, 2);
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}
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/**
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* Get the alpha component of the given pixel.
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* <br>
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*/
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public final int getAlpha(int pixel)
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{
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if (!hasAlpha())
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return 255;
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return extractAndScaleSample(pixel, 3);
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}
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private int extractAndNormalizeSample(int pixel, int component)
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{
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int value = extractAndScaleSample(pixel, component);
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if (hasAlpha() && isAlphaPremultiplied() && getAlpha(pixel) != 0)
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value = value*255/getAlpha(pixel);
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return value;
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}
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private int extractAndScaleSample(int pixel, int component)
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{
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int field = pixel & getMask(component);
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int to8BitShift =
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8 - shifts[component] - getComponentSize(component);
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return (to8BitShift>0) ?
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(field << to8BitShift) :
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(field >>> (-to8BitShift));
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}
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/**
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* Get the RGB color value of the given pixel using the default
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* RGB color model.
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* <br>
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*
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* @param pixel a pixel value
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*/
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public final int getRGB(int pixel)
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{
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/* FIXME: The Sun docs show that this method is overridden, but I
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don't see any way to improve on the superclass
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implementation. */
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return super.getRGB(pixel);
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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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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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public int getBlue(Object inData)
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{
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return getBlue(getPixelFromArray(inData));
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}
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public int getAlpha(Object inData)
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{
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return getAlpha(getPixelFromArray(inData));
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}
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public int getRGB(Object inData)
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{
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return getRGB(getPixelFromArray(inData));
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}
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/**
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* Converts a normalized pixel int value in the sRGB color
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* space to an array containing a single pixel of the color space
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* of the color model.
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*
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* <p>This method performs the inverse function of
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* <code>getRGB(Object inData)</code>.
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*
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* @param rgb pixel as a normalized sRGB, 0xAARRGGBB value.
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*
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* @param pixel to avoid needless creation of arrays, an array to
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* use to return the pixel can be given. If null, a suitable array
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* will be created.
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*
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* @return 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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* @see #getRGB(Object)
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*/
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public Object getDataElements(int rgb, Object pixel)
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{
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// FIXME: handle alpha multiply
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int pixelValue = 0;
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int a = 0;
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if (hasAlpha()) {
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a = (rgb >>> 24) & 0xff;
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pixelValue = valueToField(a, 3, 8);
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}
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if (hasAlpha() && isAlphaPremultiplied())
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{
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int r, g, b;
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/* if r=0xff and a=0xff, then resulting
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value will be (r*a)>>>8 == 0xfe... This seems wrong.
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We should divide by 255 rather than shifting >>>8 after
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multiplying.
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Too bad, shifting is probably less expensive.
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r = ((rgb >>> 16) & 0xff)*a;
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g = ((rgb >>> 8) & 0xff)*a;
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b = ((rgb >>> 0) & 0xff)*a; */
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/* The r, g, b values we calculate are 16 bit. This allows
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us to avoid discarding the lower 8 bits obtained if
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multiplying with the alpha band. */
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// using 16 bit values
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r = ((rgb >>> 8) & 0xff00)*a/255;
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g = ((rgb >>> 0) & 0xff00)*a/255;
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b = ((rgb << 8) & 0xff00)*a/255;
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pixelValue |=
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valueToField(r, 0, 16) | // Red
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valueToField(g, 1, 16) | // Green
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valueToField(b, 2, 16); // Blue
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}
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else
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{
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int r, g, b;
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// using 8 bit values
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r = (rgb >>> 16) & 0xff;
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g = (rgb >>> 8) & 0xff;
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b = (rgb >>> 0) & 0xff;
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pixelValue |=
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valueToField(r, 0, 8) | // Red
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valueToField(g, 1, 8) | // Green
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valueToField(b, 2, 8); // Blue
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}
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/* In this color model, the whole pixel fits in the first element
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of the array. */
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DataBuffer buffer = Buffers.createBuffer(transferType, pixel, 1);
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buffer.setElem(0, pixelValue);
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return Buffers.getData(buffer);
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}
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/**
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* Converts a value to the correct field bits based on the
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* information derived from the field masks.
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*
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* @param highBit the position of the most significant bit in the
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* val parameter.
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*/
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private int valueToField(int val, int component, int highBit)
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{
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int toFieldShift =
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getComponentSize(component) + shifts[component] - highBit;
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int ret = (toFieldShift>0) ?
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(val << toFieldShift) :
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(val >>> (-toFieldShift));
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return ret & getMask(component);
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}
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/**
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* Converts a 16 bit value to the correct field bits based on the
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* information derived from the field masks.
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*/
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private int value16ToField(int val, int component)
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{
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int toFieldShift = getComponentSize(component) + shifts[component] - 16;
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return (toFieldShift>0) ?
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(val << toFieldShift) :
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(val >>> (-toFieldShift));
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}
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/**
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* Fills an array with the unnormalized component samples from a
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* pixel value. I.e. decompose the pixel, but not perform any
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* color conversion.
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*/
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public final int[] getComponents(int pixel, int[] components, int offset)
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{
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int numComponents = getNumComponents();
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if (components == null) components = new int[offset + numComponents];
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for (int b=0; b<numComponents; b++)
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components[offset++] = (pixel&getMask(b)) >>> shifts[b];
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return components;
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}
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public final int[] getComponents(Object pixel, int[] components,
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int offset)
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{
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return getComponents(getPixelFromArray(pixel), components, offset);
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}
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/**
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* Creates a <code>WriteableRaster</code> that has a <code>SampleModel</code>
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* that is compatible with this <code>ColorModel</code>.
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*
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* @param w the width of the writeable raster to create
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* @param h the height of the writeable raster to create
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*
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* @throws IllegalArgumentException if <code>w</code> or <code>h</code>
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* is less than or equal to zero
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*/
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public final WritableRaster createCompatibleWritableRaster(int w, int h)
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{
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// Sun also makes this check here.
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if(w <= 0 || h <= 0)
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throw new IllegalArgumentException("width (=" + w + ") and height (="
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+ h + ") must be > 0");
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SampleModel sm = createCompatibleSampleModel(w, h);
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Point origin = new Point(0, 0);
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return Raster.createWritableRaster(sm, origin);
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|
|
}
|
373 |
|
|
|
374 |
|
|
public int getDataElement(int[] components, int offset)
|
375 |
|
|
{
|
376 |
|
|
int numComponents = getNumComponents();
|
377 |
|
|
int pixelValue = 0;
|
378 |
|
|
|
379 |
|
|
for (int c=0; c<numComponents; c++)
|
380 |
|
|
pixelValue |= (components[offset++] << shifts[c]) & getMask(c);
|
381 |
|
|
|
382 |
|
|
return pixelValue;
|
383 |
|
|
}
|
384 |
|
|
|
385 |
|
|
public Object getDataElements(int[] components, int offset, Object obj)
|
386 |
|
|
{
|
387 |
|
|
/* In this color model, the whole pixel fits in the first element
|
388 |
|
|
of the array. */
|
389 |
|
|
int pixelValue = getDataElement(components, offset);
|
390 |
|
|
|
391 |
|
|
DataBuffer buffer = Buffers.createBuffer(transferType, obj, 1);
|
392 |
|
|
buffer.setElem(0, pixelValue);
|
393 |
|
|
return Buffers.getData(buffer);
|
394 |
|
|
}
|
395 |
|
|
|
396 |
|
|
public final ColorModel coerceData (WritableRaster raster,
|
397 |
|
|
boolean isAlphaPremultiplied)
|
398 |
|
|
{
|
399 |
|
|
if (this.isAlphaPremultiplied == isAlphaPremultiplied)
|
400 |
|
|
return this;
|
401 |
|
|
|
402 |
|
|
/* TODO: provide better implementation based on the
|
403 |
|
|
assumptions we can make due to the specific type of the
|
404 |
|
|
color model. */
|
405 |
|
|
super.coerceData(raster, isAlphaPremultiplied);
|
406 |
|
|
|
407 |
|
|
return new ComponentColorModel(cspace, bits, hasAlpha(),
|
408 |
|
|
isAlphaPremultiplied, // argument
|
409 |
|
|
transparency, transferType);
|
410 |
|
|
}
|
411 |
|
|
|
412 |
|
|
public boolean isCompatibleRaster(Raster raster)
|
413 |
|
|
{
|
414 |
|
|
/* FIXME: the Sun docs say this method is overridden here,
|
415 |
|
|
but I don't see any way to improve upon the implementation
|
416 |
|
|
in ColorModel. */
|
417 |
|
|
return super.isCompatibleRaster(raster);
|
418 |
|
|
}
|
419 |
|
|
|
420 |
|
|
String stringParam()
|
421 |
|
|
{
|
422 |
|
|
return super.stringParam() +
|
423 |
|
|
", redMask=" + Integer.toHexString(getRedMask()) +
|
424 |
|
|
", greenMask=" + Integer.toHexString(getGreenMask()) +
|
425 |
|
|
", blueMask=" + Integer.toHexString(getBlueMask()) +
|
426 |
|
|
", alphaMask=" + Integer.toHexString(getAlphaMask());
|
427 |
|
|
}
|
428 |
|
|
|
429 |
|
|
public String toString()
|
430 |
|
|
{
|
431 |
|
|
/* FIXME: Again, docs say override, but how do we improve upon the
|
432 |
|
|
superclass implementation? */
|
433 |
|
|
return super.toString();
|
434 |
|
|
}
|
435 |
|
|
}
|
436 |
|
|
|