| /* GIFImageReader.java -- |
| Copyright (C) 2006 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.gif; |
| |
| import gnu.javax.imageio.IIOInputStream; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| 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; |
| import java.awt.image.IndexColorModel; |
| import java.awt.image.SampleModel; |
| import java.awt.image.MultiPixelPackedSampleModel; |
| import java.awt.image.SinglePixelPackedSampleModel; |
| import java.awt.image.DataBuffer; |
| import java.awt.image.DataBufferByte; |
| import java.awt.image.Raster; |
| import java.awt.image.WritableRaster; |
| |
| public class GIFImageReader extends ImageReader |
| { |
| private GIFFile file; |
| |
| protected GIFImageReader(ImageReaderSpi originatingProvider) |
| { |
| super( originatingProvider ); |
| file = null; |
| } |
| |
| private void readImage() throws IOException |
| { |
| if( file != null ) |
| return; |
| |
| try |
| { |
| if( input instanceof InputStream ) |
| file = new GIFFile( (InputStream)input ); |
| else |
| file = new GIFFile( new IIOInputStream((ImageInputStream)input) ); |
| } |
| catch(GIFFile.GIFException ge) |
| { |
| throw new IIOException(ge.getMessage()); |
| } |
| } |
| |
| /** |
| * Returns the Global/Local palette as an IndexColorModel |
| */ |
| private IndexColorModel getPalette(int index) |
| { |
| GIFFile f = file.getImage( index ); |
| byte[] data = f.getRawPalette(); |
| int nc = f.getNColors(); |
| byte[] r = new byte[nc]; |
| byte[] g = new byte[nc]; |
| byte[] b = new byte[nc]; |
| |
| for(int i = 0; i < nc; i ++ ) |
| { |
| r[i] = data[ i * 3 ]; |
| g[i] = data[ i * 3 + 1 ]; |
| b[i] = data[ i * 3 + 2 ]; |
| } |
| |
| if( f.hasTransparency() ) |
| { |
| byte[] a = new byte[nc]; |
| for(int i = 0; i < nc; i ++ ) |
| a[i] = (byte)0xFF; |
| a[f.getTransparentIndex()] = 0; |
| return new IndexColorModel(8, nc, r, g, b, a); |
| } |
| |
| return new IndexColorModel(8, nc, r, g, b); |
| } |
| |
| private void validateIndex(int imageIndex) |
| throws IndexOutOfBoundsException |
| { |
| if( imageIndex < 0 || imageIndex >= getNumImages(false) ) |
| 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) && |
| !(input instanceof InputStream)) |
| throw new IllegalArgumentException("Input not an ImageInputStream."); |
| } |
| |
| private void checkStream() throws IOException |
| { |
| if (!(input instanceof ImageInputStream) && |
| !(input instanceof InputStream)) |
| throw new IllegalStateException("Input not an ImageInputStream or InputStream."); |
| |
| if(input == null) |
| throw new IllegalStateException("No input stream."); |
| } |
| |
| public int getWidth(int imageIndex) throws IOException |
| { |
| validateIndex( imageIndex ); |
| return file.getImage( imageIndex ).getWidth(); |
| } |
| |
| public int getHeight(int imageIndex) throws IOException |
| { |
| validateIndex( imageIndex ); |
| return file.getImage( imageIndex ).getHeight(); |
| } |
| |
| public Iterator getImageTypes(int imageIndex) |
| { |
| validateIndex( imageIndex ); |
| return null; |
| } |
| |
| /** |
| * Returns the number of images. |
| */ |
| public int getNumImages(boolean allowSearch) |
| { |
| try // Image should be loaded here already. But just in case: |
| { |
| readImage(); |
| } |
| catch(IOException ioe) |
| { |
| return 0; // Well, now we're in trouble. But return something anyway. |
| } |
| return file.nImages(); |
| } |
| |
| |
| // 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 ); |
| GIFFile f = file.getImage( imageIndex ); |
| int width = f.getWidth(); |
| int height = f.getHeight(); |
| SampleModel sm; |
| switch( f.getNColors() ) |
| { |
| case 16: |
| sm = new MultiPixelPackedSampleModel(DataBuffer.TYPE_BYTE, |
| width, height, 4); |
| break; |
| case 4: |
| sm = new MultiPixelPackedSampleModel(DataBuffer.TYPE_BYTE, |
| width, height, 2); |
| break; |
| case 2: |
| sm = new MultiPixelPackedSampleModel(DataBuffer.TYPE_BYTE, |
| width, height, 1); |
| break; |
| default: |
| sm = new SinglePixelPackedSampleModel(DataBuffer.TYPE_BYTE, |
| width, height, |
| new int[] {0xFF}); |
| break; |
| } |
| DataBuffer db = new DataBufferByte(f.getRawImage(), width * height, 0); |
| WritableRaster raster = Raster.createWritableRaster(sm, db, null); |
| |
| return new BufferedImage(getPalette( imageIndex ), raster, false, null); |
| } |
| } |