272 lines
7.0 KiB
Java
272 lines
7.0 KiB
Java
// ImageEncoder - abstract class for writing out an image
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//
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// Copyright (C) 1996 by Jef Poskanzer <jef@acme.com>. All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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// 1. Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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// OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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// OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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// SUCH DAMAGE.
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//
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// Visit the ACME Labs Java page for up-to-date versions of this and other
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// fine Java utilities: http://www.acme.com/java/
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package tm.gfxlibs;
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import java.util.*;
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import java.io.*;
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import java.awt.Image;
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import java.awt.image.*;
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/// Abstract class for writing out an image.
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// <P>
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// A framework for classes that encode and write out an image in
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// a particular file format.
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// <P>
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// This provides a simplified rendition of the ImageConsumer interface.
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// It always delivers the pixels as ints in the RGBdefault color model.
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// It always provides them in top-down left-right order.
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// If you want more flexibility you can always implement ImageConsumer
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// directly.
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// <P>
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// <A HREF="/resources/classes/Acme/JPM/Encoders/ImageEncoder.java">Fetch the software.</A><BR>
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// <A HREF="/resources/classes/Acme.tar.gz">Fetch the entire Acme package.</A>
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// <P>
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// @see GifEncoder
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// @see PpmEncoder
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// @see Acme.JPM.Decoders.ImageDecoder
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public abstract class ImageEncoder implements ImageConsumer
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{
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protected OutputStream out;
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private ImageProducer producer;
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private int width = -1;
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private int height = -1;
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private int hintflags = 0;
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private boolean started = false;
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private boolean encoding;
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private IOException iox;
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private static final ColorModel rgbModel = ColorModel.getRGBdefault();
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private Hashtable props = null;
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/// Constructor.
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// @param img The image to encode.
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// @param out The stream to write the bytes to.
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public ImageEncoder( Image img, OutputStream out ) throws IOException
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{
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this( img.getSource(), out );
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}
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/// Constructor.
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// @param producer The ImageProducer to encode.
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// @param out The stream to write the bytes to.
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public ImageEncoder( ImageProducer producer, OutputStream out ) throws IOException
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{
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this.producer = producer;
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this.out = out;
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}
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// Methods that subclasses implement.
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/// Subclasses implement this to initialize an encoding.
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abstract void encodeStart( int w, int h ) throws IOException;
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/// Subclasses implement this to actually write out some bits. They
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// are guaranteed to be delivered in top-down-left-right order.
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// One int per pixel, index is row * scansize + off + col,
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// RGBdefault (AARRGGBB) color model.
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abstract void encodePixels(
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int x, int y, int w, int h, int[] rgbPixels, int off, int scansize )
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throws IOException;
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/// Subclasses implement this to finish an encoding.
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abstract void encodeDone() throws IOException;
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// Our own methods.
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/// Call this after initialization to get things going.
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public synchronized void encode() throws IOException
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{
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encoding = true;
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iox = null;
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producer.startProduction( this );
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while ( encoding )
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try
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{
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wait();
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}
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catch ( InterruptedException e ) {}
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if ( iox != null )
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throw iox;
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}
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private boolean accumulate = false;
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private int[] accumulator;
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private void encodePixelsWrapper(
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int x, int y, int w, int h, int[] rgbPixels, int off, int scansize )
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throws IOException
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{
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if ( ! started )
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{
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started = true;
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encodeStart( width, height );
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if ( ( hintflags & TOPDOWNLEFTRIGHT ) == 0 )
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{
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accumulate = true;
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accumulator = new int[width * height];
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}
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}
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if ( accumulate )
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for ( int row = 0; row < h; ++row )
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System.arraycopy(
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rgbPixels, row * scansize + off,
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accumulator, ( y + row ) * width + x,
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w );
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else
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encodePixels( x, y, w, h, rgbPixels, off, scansize );
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}
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private void encodeFinish() throws IOException
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{
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if ( accumulate )
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{
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encodePixels( 0, 0, width, height, accumulator, 0, width );
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accumulator = null;
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accumulate = false;
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}
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}
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private synchronized void stop()
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{
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encoding = false;
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notifyAll();
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}
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// Methods from ImageConsumer.
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public void setDimensions( int width, int height )
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{
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this.width = width;
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this.height = height;
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}
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public void setProperties( Hashtable props )
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{
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this.props = props;
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}
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public void setColorModel( ColorModel model )
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{
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// Ignore.
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}
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public void setHints( int hintflags )
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{
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this.hintflags = hintflags;
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}
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public void setPixels(
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int x, int y, int w, int h, ColorModel model, byte[] pixels,
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int off, int scansize )
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{
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int[] rgbPixels = new int[w];
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for ( int row = 0; row < h; ++row )
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{
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int rowOff = off + row * scansize;
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for ( int col = 0; col < w; ++col )
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rgbPixels[col] = model.getRGB( pixels[rowOff + col] & 0xff );
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try
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{
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encodePixelsWrapper( x, y + row, w, 1, rgbPixels, 0, w );
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}
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catch ( IOException e )
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{
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iox = e;
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stop();
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return;
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}
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}
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}
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public void setPixels(
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int x, int y, int w, int h, ColorModel model, int[] pixels,
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int off, int scansize )
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{
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if ( model == rgbModel )
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{
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try
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{
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encodePixelsWrapper( x, y, w, h, pixels, off, scansize );
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}
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catch ( IOException e )
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{
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iox = e;
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stop();
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return;
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}
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}
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else
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{
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int[] rgbPixels = new int[w];
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for ( int row = 0; row < h; ++row )
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{
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int rowOff = off + row * scansize;
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for ( int col = 0; col < w; ++col )
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rgbPixels[col] = model.getRGB( pixels[rowOff + col] );
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try
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{
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encodePixelsWrapper( x, y + row, w, 1, rgbPixels, 0, w );
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}
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catch ( IOException e )
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{
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iox = e;
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stop();
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return;
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}
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}
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}
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}
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public void imageComplete( int status )
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{
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producer.removeConsumer( this );
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if ( status == ImageConsumer.IMAGEABORTED )
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iox = new IOException( "image aborted" );
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else
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{
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try
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{
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encodeFinish();
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encodeDone();
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}
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catch ( IOException e )
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{
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iox = e;
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}
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}
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stop();
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}
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}
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