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