| /* BMPImageReader.java -- |
| Copyright (C) 2005 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| package gnu.javax.imageio.bmp; |
| |
| import java.io.IOException; |
| import javax.imageio.*; |
| import javax.imageio.spi.*; |
| import javax.imageio.metadata.*; |
| import javax.imageio.stream.ImageInputStream; |
| import java.util.Iterator; |
| import java.awt.image.BufferedImage; |
| |
| public class BMPImageReader extends ImageReader { |
| private BMPInfoHeader infoHeader; |
| private BMPFileHeader fileHeader; |
| private BMPDecoder decoder; |
| |
| protected BMPImageReader(ImageReaderSpi originatingProvider){ |
| super(originatingProvider); |
| infoHeader = null; |
| fileHeader = null; |
| decoder = null; |
| } |
| |
| private void validateIndex(int imageIndex) |
| throws IndexOutOfBoundsException { |
| if (imageIndex != 0) |
| throw new IndexOutOfBoundsException("Invalid image index."); |
| } |
| |
| public void setInput(Object input) { |
| super.setInput(input); |
| } |
| |
| public void setInput(Object input, |
| boolean seekForwardOnly, |
| boolean ignoreMetadata) { |
| super.setInput(input, seekForwardOnly, ignoreMetadata); |
| } |
| |
| public void setInput(Object input, boolean isStreamable) { |
| super.setInput(input, isStreamable); |
| |
| if (!(input instanceof ImageInputStream)) |
| throw new IllegalArgumentException("Input not an ImageInputStream."); |
| } |
| |
| private void checkStream() throws IOException { |
| if (!(input instanceof ImageInputStream)) |
| throw new IllegalStateException("Input not an ImageInputStream."); |
| if(input == null) |
| throw new IllegalStateException("No input stream."); |
| |
| } |
| |
| private void readHeaders() throws IOException, IIOException { |
| if(fileHeader != null) |
| return; |
| |
| checkStream(); |
| |
| fileHeader = new BMPFileHeader((ImageInputStream)input); |
| infoHeader = new BMPInfoHeader((ImageInputStream)input); |
| decoder = BMPDecoder.getDecoder(fileHeader, infoHeader); |
| } |
| |
| public int getWidth(int imageIndex) throws IOException { |
| validateIndex(imageIndex); |
| readHeaders(); |
| return infoHeader.getWidth(); |
| } |
| |
| public int getHeight(int imageIndex) throws IOException { |
| validateIndex(imageIndex); |
| readHeaders(); |
| return infoHeader.getHeight(); |
| } |
| |
| public Iterator getImageTypes(int imageIndex){ |
| validateIndex(imageIndex); |
| return null; |
| } |
| |
| /** |
| * Returns the number of images. BMP files can only contain a single one. |
| */ |
| public int getNumImages(boolean allowSearch){ |
| return 1; |
| } |
| |
| |
| // FIXME: Support metadata |
| public IIOMetadata getImageMetadata(int imageIndex){ |
| validateIndex(imageIndex); |
| return null; |
| } |
| |
| // FIXME: Support metadata |
| public IIOMetadata getStreamMetadata(){ |
| return null; |
| } |
| |
| /** |
| * Reads the image indexed by imageIndex and returns it as |
| * a complete BufferedImage, using a supplied ImageReadParam. |
| */ |
| public BufferedImage read(int imageIndex, ImageReadParam param) |
| throws IOException, IIOException { |
| validateIndex(imageIndex); |
| readHeaders(); |
| return decoder.decode((ImageInputStream)input); |
| } |
| } |
| |
| |
| |