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jeremybenn |
/* ImageTypeSpecifier.java --
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Copyright (C) 2004 Free Software Foundation, Inc.
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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 javax.imageio;
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import java.awt.Transparency;
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import java.awt.color.ColorSpace;
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import java.awt.image.DataBuffer;
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import java.awt.image.BandedSampleModel;
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import java.awt.image.BufferedImage;
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import java.awt.image.ColorModel;
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import java.awt.image.ComponentColorModel;
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import java.awt.image.DirectColorModel;
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import java.awt.image.IndexColorModel;
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import java.awt.image.MultiPixelPackedSampleModel;
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import java.awt.image.PixelInterleavedSampleModel;
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import java.awt.image.RenderedImage;
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import java.awt.image.SampleModel;
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/**
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* ImageTypeSpecifier store the color and sample models associated
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* with an IIOImage.
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*/
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public class ImageTypeSpecifier
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{
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/**
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* The image's color model.
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*/
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protected ColorModel colorModel;
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/**
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* The image's sample model.
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*/
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protected SampleModel sampleModel;
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/**
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* Construct an image type specifier with the given models.
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*
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* @param colorModel the color model
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* @param sampleModel the sample model
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*
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* @exception IllegalArgumentException if either model argument is
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* null
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* @exception IllegalArgumentException if the models are
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* incompatible with one another
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*/
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public ImageTypeSpecifier(ColorModel colorModel, SampleModel sampleModel)
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{
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if (colorModel == null)
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throw new IllegalArgumentException("colorModel may not be null");
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if (sampleModel == null)
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throw new IllegalArgumentException("sampleModel may not be null");
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if (!colorModel.isCompatibleSampleModel(sampleModel))
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throw new IllegalArgumentException
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("sample Model not compatible with colorModel");
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this.colorModel = colorModel;
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this.sampleModel = sampleModel;
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}
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/**
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* Construct an image type specifier that describes the given
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* rendered image.
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*
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* @param image a rendered image
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*
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* @exception IllegalArgumentException if image is null
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*/
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public ImageTypeSpecifier(RenderedImage image)
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{
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if (image == null)
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throw new IllegalArgumentException("image may not be null");
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this.colorModel = image.getColorModel();
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this.sampleModel = image.getSampleModel();
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}
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/**
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* Create an image type specifier for a banded image using a
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* component color model and a banded sample model.
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*
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* @param colorSpace the color space
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* @param bankIndices the bank indices at which each band will be
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* stored
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* @param bankOffsets the starting band offset for each band within
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* its bank
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* @param dataType the data type, a DataBuffer constant
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* @param hasAlpha true if this image type specifier should have an
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* alpha component, false otherwise
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* @param isAlphaPremultiplied true if other color components should
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* be premultiplied by the alpha component, false otherwise
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*
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* @return a banded image type specifier
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*
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* @exception IllegalArgumentException if any of colorSpace,
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* bankIndices or bankOffsets is null
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* @exception IllegalArgumentException if bankIndices and
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* bankOffsets differ in length
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* @excpetion IllegalArgumentException if the number of color space
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* components, including the alpha component if requested, is
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* different from bandOffsets.length
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* @exception if dataType is not a valid DataBuffer constant
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*/
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public static ImageTypeSpecifier createBanded (ColorSpace colorSpace,
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int[] bankIndices,
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int[] bankOffsets,
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int dataType,
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boolean hasAlpha,
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boolean isAlphaPremultiplied)
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{
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if (colorSpace == null || bankIndices == null || bankOffsets == null)
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throw new IllegalArgumentException ("null argument");
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if (bankIndices.length != bankOffsets.length)
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throw new IllegalArgumentException ("array lengths differ");
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if (bankOffsets.length != (colorSpace.getNumComponents() + (hasAlpha ? 1 : 0)))
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throw new IllegalArgumentException ("invalid bankOffsets length");
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return new ImageTypeSpecifier (new ComponentColorModel (colorSpace,
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hasAlpha,
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isAlphaPremultiplied,
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hasAlpha ? Transparency.TRANSLUCENT : Transparency.OPAQUE,
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dataType),
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new BandedSampleModel (dataType, 1, 1, 1,
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bankIndices,
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bankOffsets));
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}
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/**
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* Create a buffered image with the given dimensions using that has
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* the characteristics specified by this image type specifier.
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*
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* @param width width of the buffered image, in pixels
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* @param height the height of the buffered image, in pixels
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*
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* @return a buffered image
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*
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* @exception IllegalArgumentException if either width or height is
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* less than or equal to zero
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* @exception IllegalArgumentException if width * height is greater
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* than Integer.MAX_VALUE or if the storage required is greater than
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* Integer.MAX_VALUE
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*/
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public BufferedImage createBufferedImage (int width, int height)
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{
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if (width <= 0 || height <= 0)
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throw new IllegalArgumentException ("dimension <= 0");
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// test for overflow
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if (width * height < Math.min (width, height))
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throw new IllegalArgumentException ("width * height > Integer.MAX_VALUE");
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if (width * height * sampleModel.getNumBands() < Math.min (width, height))
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throw new IllegalArgumentException ("storage required >"
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+ " Integer.MAX_VALUE");
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// FIXME: this is probably wrong:
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return new BufferedImage (width, height, BufferedImage.TYPE_INT_RGB);
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}
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/**
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* Create an image type specifier that describes the given buffered
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* image type.
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*
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* @param bufferedImageType the buffered image type to represent
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* with the returned image type specifier
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*
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* @return a new image type specifier
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*
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* @exception IllegalArgumentException if bufferedImageType is not a
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* BufferedImage constant or is BufferedImage.TYPE_CUSTOM
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*/
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public static ImageTypeSpecifier createFromBufferedImageType (int bufferedImageType)
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{
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if (bufferedImageType <= BufferedImage.TYPE_CUSTOM
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|| bufferedImageType > BufferedImage.TYPE_BYTE_INDEXED)
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throw new IllegalArgumentException ("invalid buffered image type");
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return new ImageTypeSpecifier (new BufferedImage (1, 1, bufferedImageType));
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}
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/**
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* Create an image type specifier that describes the given rendered
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* image's type.
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*
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* @param image the rendered image
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*
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* @return a new image type specifier
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*
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* @exception IllegalArgumentException if image is null
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*/
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public static ImageTypeSpecifier createFromRenderedImage (RenderedImage image)
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{
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if (image == null)
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throw new IllegalArgumentException ("image null");
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return new ImageTypeSpecifier (image);
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}
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/**
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* Create a grayscale image type specifier, given the number of
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* bits, data type and whether or not the data is signed.
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*
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* @param bits the number of bits used to specify a greyscale value
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* @param dataType a DataBuffer type constant
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* @param isSigned true if this type specifier should support
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* negative values, false otherwise
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*
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* @return a greyscal image type specifier
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*
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* @exception IllegalArgumentException if bits is not 1, 2, 4, 8 or 16
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* @exception IllegalArgumentException if dataType is not
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* DataBuffer.TYPE_BYTE, DataBuffer.TYPE_SHORT or
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* DataBuffer.TYPE_USHORT
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* @exception if bits is larger than the number of bits in the given
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* data type
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*/
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public static ImageTypeSpecifier createGrayscale (int bits, int dataType, boolean isSigned)
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{
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return createGrayscale (bits, dataType, isSigned, false);
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}
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/**
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* Create a grayscale image type specifier, given the number of
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* bits, data type and whether or not the data is signed.
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*
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* @param bits the number of bits used to specify a greyscale value
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* @param dataType a DataBuffer type constant
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* @param isSigned true if this type specifier should support
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* negative values, false otherwise
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*
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* @return a greyscal image type specifier
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*
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* @exception IllegalArgumentException if bits is not 1, 2, 4, 8 or
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* 16
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* @exception IllegalArgumentException if dataType is not
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* DataBuffer.TYPE_BYTE, DataBuffer.TYPE_SHORT or
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* DataBuffer.TYPE_USHORT
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* @exception if bits is larger than the number of bits in the given
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* data type
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*/
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public static ImageTypeSpecifier createGrayscale (int bits, int dataType,
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boolean isSigned,
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boolean isAlphaPremultiplied)
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{
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if (bits != 1 && bits != 2 && bits != 4 && bits != 8 && bits != 16)
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throw new IllegalArgumentException ("invalid bit size");
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if (dataType != DataBuffer.TYPE_BYTE && dataType != DataBuffer.TYPE_SHORT
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&& dataType != DataBuffer.TYPE_USHORT)
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throw new IllegalArgumentException ("invalid data type");
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if (dataType == DataBuffer.TYPE_BYTE && bits > 8)
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throw new IllegalArgumentException ("number of bits too large for data type");
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// FIXME: this is probably wrong:
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return new ImageTypeSpecifier (new DirectColorModel (bits, 0xff, 0x0,
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0x0, 0xff),
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new MultiPixelPackedSampleModel (dataType,
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1, 1,
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bits));
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}
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/**
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* Return an image type specifier for an image that uses an indexed
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* colour model where each colour value has the specified number of
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* bits and type and where the colour tables are those given.
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*
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* @param redLUT the red index values
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* @param greenLUT the green index values
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* @param blueLUT the blue index values
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* @param alphaLUT the alpha index values
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* @param bits the number of bits per index value
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* @param dataType the type of each index value
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*
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* @return an indexed image type specifier
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*
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* @exception IllegalArgumentException if any of the colour arrays,
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* not including alphaLUT, is null
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* @exception IllegalArgumentException if bits is not 1, 2, 4, 8 or
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* 16
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* @exception IllegalArgumentException if dataType is not
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* DataBuffer.TYPE_BYTE, DataBuffer.TYPE_SHORT or
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* DataBuffer.TYPE_USHORT
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* @exception if bits is larger than the number of bits in the given
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* data type
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*/
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public static ImageTypeSpecifier createIndexed (byte[] redLUT,
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byte[] greenLUT,
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byte[] blueLUT,
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byte[] alphaLUT,
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int bits,
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int dataType)
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{
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if (redLUT == null || greenLUT == null || blueLUT == null)
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throw new IllegalArgumentException ("null colour table");
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if (bits != 1 && bits != 2 && bits != 4 && bits != 8 && bits != 16)
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throw new IllegalArgumentException ("invalid bit size");
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if (dataType != DataBuffer.TYPE_BYTE && dataType != DataBuffer.TYPE_SHORT
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&& dataType != DataBuffer.TYPE_USHORT)
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throw new IllegalArgumentException ("invalid data type");
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if (dataType == DataBuffer.TYPE_BYTE && bits > 8)
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throw new IllegalArgumentException ("number of bits too large for data type");
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// FIXME: this is probably wrong:
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return new ImageTypeSpecifier (new IndexColorModel (bits, redLUT.length,
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redLUT, greenLUT, blueLUT,
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alphaLUT),
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new MultiPixelPackedSampleModel (dataType,
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1, 1,
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bits));
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}
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/**
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356 |
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* Create an image type specifier that uses a component colour model
|
357 |
|
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* and a pixel interleaved sample model. Each pixel component will
|
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* be stored in a separate value of the given data type.
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*
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* @param colorSpace the colour space used by the colour model
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361 |
|
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* @param bandOffsets the starting band offset for each band within
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362 |
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* its bank
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363 |
|
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* @param dataType the type of each pixel value
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364 |
|
|
* @param hasAlpha true if an alpha channel should be specified,
|
365 |
|
|
* false otherwise
|
366 |
|
|
* @param isAlphaPremultiplied true if other colour channels should
|
367 |
|
|
* be premultiplied by the alpha value, false otherwise
|
368 |
|
|
*
|
369 |
|
|
* @return an interleaved image type specifier
|
370 |
|
|
*
|
371 |
|
|
* @exception IllegalArgumentException if either colorSpace or
|
372 |
|
|
* bandOffsets is null
|
373 |
|
|
* @excpetion IllegalArgumentException if the number of color space
|
374 |
|
|
* components, including the alpha component if requested, is
|
375 |
|
|
* different from bandOffsets.length
|
376 |
|
|
* @exception if dataType is not a valid DataBuffer constant
|
377 |
|
|
*/
|
378 |
|
|
public static ImageTypeSpecifier createInterleaved (ColorSpace colorSpace,
|
379 |
|
|
int[] bandOffsets,
|
380 |
|
|
int dataType,
|
381 |
|
|
boolean hasAlpha,
|
382 |
|
|
boolean isAlphaPremultiplied)
|
383 |
|
|
{
|
384 |
|
|
if (colorSpace == null || bandOffsets == null)
|
385 |
|
|
throw new IllegalArgumentException ("null argument");
|
386 |
|
|
|
387 |
|
|
if (bandOffsets.length != (colorSpace.getNumComponents() + (hasAlpha ? 1 : 0)))
|
388 |
|
|
throw new IllegalArgumentException ("invalid bankOffsets length");
|
389 |
|
|
|
390 |
|
|
return new ImageTypeSpecifier (new ComponentColorModel (colorSpace,
|
391 |
|
|
hasAlpha,
|
392 |
|
|
isAlphaPremultiplied,
|
393 |
|
|
hasAlpha ? Transparency.TRANSLUCENT : Transparency.OPAQUE,
|
394 |
|
|
dataType),
|
395 |
|
|
new PixelInterleavedSampleModel (dataType, 1, 1, 1, 1,
|
396 |
|
|
bandOffsets));
|
397 |
|
|
}
|
398 |
|
|
|
399 |
|
|
/**
|
400 |
|
|
* Create an image type specifier using a direct color model and a
|
401 |
|
|
* packed sample model. All pixel components will be packed into
|
402 |
|
|
* one value of the given data type.
|
403 |
|
|
*
|
404 |
|
|
* @param colorSpace the color space to use in the color model
|
405 |
|
|
* @param redMask the bitmask for the red bits
|
406 |
|
|
* @param greenMask the bitmask for the green bits
|
407 |
|
|
* @param blueMask the bitmask for the blue bits
|
408 |
|
|
* @param alphaMask the bitmask for the alpha bits
|
409 |
|
|
* @param transferType the data type used to store pixel values
|
410 |
|
|
* @param isAlphaPremultiplied true if other colour channels should
|
411 |
|
|
* be premultiplied by the alpha value, false otherwise
|
412 |
|
|
*
|
413 |
|
|
* @return a packed image type specifier
|
414 |
|
|
*
|
415 |
|
|
* @exception IllegalArgumentException if colorSpace is null
|
416 |
|
|
* @exception IllegalArgumentException if colorSpace does not have
|
417 |
|
|
* type ColorSpace.TYPE_RGB
|
418 |
|
|
* @exception IllegalArgumentException if all masks are 0
|
419 |
|
|
* @exception IllegalArgumentException if dataType is not
|
420 |
|
|
* DataBuffer.TYPE_BYTE, DataBuffer.TYPE_SHORT or
|
421 |
|
|
* DataBuffer.TYPE_INT
|
422 |
|
|
*/
|
423 |
|
|
public static ImageTypeSpecifier createPacked (ColorSpace colorSpace,
|
424 |
|
|
int redMask,
|
425 |
|
|
int greenMask,
|
426 |
|
|
int blueMask,
|
427 |
|
|
int alphaMask,
|
428 |
|
|
int transferType,
|
429 |
|
|
boolean isAlphaPremultiplied)
|
430 |
|
|
{
|
431 |
|
|
if (colorSpace == null)
|
432 |
|
|
throw new IllegalArgumentException ("null color space");
|
433 |
|
|
|
434 |
|
|
if (colorSpace.getType() != ColorSpace.TYPE_RGB)
|
435 |
|
|
throw new IllegalArgumentException ("invalid color space type");
|
436 |
|
|
|
437 |
|
|
if (redMask == 0 && greenMask == 0 && blueMask == 0 && alphaMask == 0)
|
438 |
|
|
throw new IllegalArgumentException ("no non-zero mask");
|
439 |
|
|
|
440 |
|
|
if (transferType != DataBuffer.TYPE_BYTE && transferType != DataBuffer.TYPE_USHORT
|
441 |
|
|
&& transferType != DataBuffer.TYPE_INT)
|
442 |
|
|
throw new IllegalArgumentException ("invalid data type");
|
443 |
|
|
|
444 |
|
|
// Assume DataBuffer.TYPE_BYTE.
|
445 |
|
|
int numBits = 8;
|
446 |
|
|
|
447 |
|
|
if (transferType == DataBuffer.TYPE_SHORT)
|
448 |
|
|
numBits = 16;
|
449 |
|
|
else if (transferType == DataBuffer.TYPE_INT)
|
450 |
|
|
numBits = 32;
|
451 |
|
|
|
452 |
|
|
return new ImageTypeSpecifier (new DirectColorModel (colorSpace,
|
453 |
|
|
numBits,
|
454 |
|
|
redMask,
|
455 |
|
|
greenMask,
|
456 |
|
|
blueMask,
|
457 |
|
|
alphaMask,
|
458 |
|
|
isAlphaPremultiplied,
|
459 |
|
|
transferType),
|
460 |
|
|
new MultiPixelPackedSampleModel (transferType,
|
461 |
|
|
1, 1, numBits));
|
462 |
|
|
}
|
463 |
|
|
|
464 |
|
|
/**
|
465 |
|
|
* Get the number of bits per sample in the given band.
|
466 |
|
|
*
|
467 |
|
|
* @param band the band from which to get the number of bits
|
468 |
|
|
*
|
469 |
|
|
* @return the number of bits in the given band
|
470 |
|
|
*
|
471 |
|
|
* @exception IllegalArgumentException if band is out-of-bounds
|
472 |
|
|
*/
|
473 |
|
|
public int getBitsPerBand (int band)
|
474 |
|
|
{
|
475 |
|
|
if (band < 0 || band > sampleModel.getNumBands())
|
476 |
|
|
throw new IllegalArgumentException ("band out-of-bounds");
|
477 |
|
|
|
478 |
|
|
return sampleModel.getSampleSize (band);
|
479 |
|
|
}
|
480 |
|
|
|
481 |
|
|
/**
|
482 |
|
|
* Get the buffered image constant specified by this image type
|
483 |
|
|
* specifier.
|
484 |
|
|
*
|
485 |
|
|
* @return a buffered image constant
|
486 |
|
|
*/
|
487 |
|
|
public int getBufferedImageType ()
|
488 |
|
|
{
|
489 |
|
|
// FIXME:
|
490 |
|
|
return BufferedImage.TYPE_INT_RGB;
|
491 |
|
|
}
|
492 |
|
|
|
493 |
|
|
/**
|
494 |
|
|
* Create a sample model that is compatible with the one specified
|
495 |
|
|
* by this image type specifier, with the given dimensions.
|
496 |
|
|
*
|
497 |
|
|
* @param width the width of the returned sample model
|
498 |
|
|
* @param height the height of the returned sample model
|
499 |
|
|
*
|
500 |
|
|
* @return a sample model compatible with the one in this image type
|
501 |
|
|
* specifier, with the given dimensions
|
502 |
|
|
*
|
503 |
|
|
* @exception IllegalArgumentException if either width or height is
|
504 |
|
|
* less than or equal to 0
|
505 |
|
|
* @exception IllegalArgumentException if width * height is greater
|
506 |
|
|
* than Intere.MAX_VALUE
|
507 |
|
|
*/
|
508 |
|
|
public SampleModel getSampleModel (int width, int height)
|
509 |
|
|
{
|
510 |
|
|
if (width <= 0 || height <= 0)
|
511 |
|
|
throw new IllegalArgumentException ("invalid dimension");
|
512 |
|
|
|
513 |
|
|
// test for overflow
|
514 |
|
|
if (width * height < Math.min (width, height))
|
515 |
|
|
throw new IllegalArgumentException ("width * height > Integer.MAX_VALUE");
|
516 |
|
|
|
517 |
|
|
return sampleModel.createCompatibleSampleModel (width, height);
|
518 |
|
|
}
|
519 |
|
|
|
520 |
|
|
/**
|
521 |
|
|
* Get the color model specified by this image type specifier.
|
522 |
|
|
*
|
523 |
|
|
* @return the color model
|
524 |
|
|
*/
|
525 |
|
|
public ColorModel getColorModel()
|
526 |
|
|
{
|
527 |
|
|
return colorModel;
|
528 |
|
|
}
|
529 |
|
|
|
530 |
|
|
/**
|
531 |
|
|
* Get the number of bands specified by this image type specifier's
|
532 |
|
|
* sample model.
|
533 |
|
|
*
|
534 |
|
|
* @return the number of bands in the sample model
|
535 |
|
|
*/
|
536 |
|
|
public int getNumBands()
|
537 |
|
|
{
|
538 |
|
|
return sampleModel.getNumBands();
|
539 |
|
|
}
|
540 |
|
|
|
541 |
|
|
/**
|
542 |
|
|
* Get the number of components specified by this image type
|
543 |
|
|
* specifier's color model.
|
544 |
|
|
*
|
545 |
|
|
* @return the number of color components per pixel
|
546 |
|
|
*/
|
547 |
|
|
public int getNumComponents()
|
548 |
|
|
{
|
549 |
|
|
return colorModel.getNumComponents();
|
550 |
|
|
}
|
551 |
|
|
|
552 |
|
|
/**
|
553 |
|
|
* Get the sample model specified by this image type specifier.
|
554 |
|
|
*
|
555 |
|
|
* @return the sample model
|
556 |
|
|
*/
|
557 |
|
|
public SampleModel getSampleModel()
|
558 |
|
|
{
|
559 |
|
|
return sampleModel;
|
560 |
|
|
}
|
561 |
|
|
}
|