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220 lines
8.0 KiB
220 lines
8.0 KiB
5 years ago
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package com.fr.third.JAI;
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/*
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* Copyright (c) 2001 Sun Microsystems, Inc. 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 are met:
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*
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* -Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* -Redistribution in binary form must reproduct the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of Sun Microsystems, Inc. or the names of contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* This software is provided "AS IS," without a warranty of any kind. ALL
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* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
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* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
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* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
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* LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
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* OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
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* LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
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* INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
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* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
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* OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*
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* You acknowledge that Software is not designed,licensed or intended for use in
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* the design, construction, operation or maintenance of any nuclear facility.
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*/
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import java.awt.Point;
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import java.awt.color.ColorSpace;
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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.IndexColorModel;
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import java.awt.image.DataBuffer;
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import java.awt.image.WritableRaster;
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import java.awt.image.RenderedImage;
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import java.awt.image.SampleModel;
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import java.io.IOException;
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import java.io.OutputStream;
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//
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// Need these classes since we are currently using the
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// Java2D JpegEncoder for our Jpeg Implementation.
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//
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import com.sun.image.codec.jpeg.JPEGQTable;
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import com.sun.image.codec.jpeg.JPEGDecodeParam;
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/**
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* An ImageEncoder for the JPEG (JFIF) file format.
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*
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* The common cases of single band grayscale and three or four band RGB images
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* are handled so as to minimize the amount of information required of the
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* programmer. See the comments pertaining to the constructor and the
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* <code>writeToStream()</code> method for more detailed information.
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*
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*/
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public class JPEGImageEncoder extends ImageEncoderImpl {
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private JPEGEncodeParam jaiEP = null;
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public JPEGImageEncoder(OutputStream output,
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ImageEncodeParam param) {
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super(output, param);
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if (param != null) {
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jaiEP = (JPEGEncodeParam)param;
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}
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}
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//
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// Go through the settable encoding parameters and see
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// if any of them have been set. If so, transfer then to the
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// com.sun.image.codec.jpeg.JPEGEncodeParam object.
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//
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static void modifyEncodeParam(JPEGEncodeParam jaiEP,
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com.sun.image.codec.jpeg.JPEGEncodeParam j2dEP,
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int nbands) {
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int val;
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int[] qTab;
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for(int i=0; i<nbands; i++) {
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//
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// If subsampling factors were set, apply them
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//
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val = jaiEP.getHorizontalSubsampling(i);
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j2dEP.setHorizontalSubsampling(i, val);
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val = jaiEP.getVerticalSubsampling(i);
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j2dEP.setVerticalSubsampling(i, val);
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//
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// If new Q factors were supplied, apply them
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//
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if (jaiEP.isQTableSet(i)) {
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qTab = jaiEP.getQTable(i);
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val = jaiEP.getQTableSlot(i);
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j2dEP.setQTableComponentMapping(i, val);
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j2dEP.setQTable(val, new JPEGQTable(qTab));
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}
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}
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// Apply new quality, if set
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if (jaiEP.isQualitySet()) {
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float fval = jaiEP.getQuality();
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j2dEP.setQuality(fval, true);
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}
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// Apply new restart interval, if set
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val = jaiEP.getRestartInterval();
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j2dEP.setRestartInterval(val);
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// Write a tables-only abbreviated JPEG file
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if (jaiEP.getWriteTablesOnly() == true) {
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j2dEP.setImageInfoValid(false);
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j2dEP.setTableInfoValid(true);
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}
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// Write an image-only abbreviated JPEG file
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if (jaiEP.getWriteImageOnly() == true) {
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j2dEP.setTableInfoValid(false);
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j2dEP.setImageInfoValid(true);
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}
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// Write the JFIF (APP0) marker
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if (jaiEP.getWriteJFIFHeader() == false) {
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j2dEP.setMarkerData(
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com.sun.image.codec.jpeg.JPEGDecodeParam.APP0_MARKER, null);
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}
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}
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/**
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* Encodes a RenderedImage and writes the output to the
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* OutputStream associated with this ImageEncoder.
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*/
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public void encode(RenderedImage im) throws IOException {
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//
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// Check data type and band count compatibility.
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// This implementation handles only 1 and 3 band source images.
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//
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SampleModel sampleModel = im.getSampleModel();
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ColorModel colorModel = im.getColorModel();
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// Must be a 1 or 3 component BYTE image
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int numBands = colorModel.getNumColorComponents();
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int transType = sampleModel.getTransferType();
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if ((transType != DataBuffer.TYPE_BYTE) ||
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((numBands != 1) && (numBands != 3) )) {
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throw new RuntimeException(JaiI18N.getString("JPEGImageEncoder0"));
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}
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// Must be GRAY or RGB
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int cspaceType = colorModel.getColorSpace().getType();
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if (cspaceType != ColorSpace.TYPE_GRAY &&
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cspaceType != ColorSpace.TYPE_RGB) {
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throw new Error(JaiI18N.getString("JPEGImageEncoder1"));
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}
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//
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// Create a BufferedImage to be encoded.
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// The JPEG interfaces really need a whole image.
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//
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WritableRaster wRas;
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BufferedImage bi;
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//
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// Get a contiguous raster. Jpeg compression can't work
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// on tiled data in most cases.
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// Also need to be sure that the raster doesn't have a
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// non-zero origin, since BufferedImage won't accept that.
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// (Bug ID 4253990)
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//
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wRas = (WritableRaster)im.getData();
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if (wRas.getMinX() != 0 || wRas.getMinY() != 0) {
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wRas = wRas.createWritableTranslatedChild(0, 0);
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}
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// First create the Java2D encodeParam based on the BufferedImage
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com.sun.image.codec.jpeg.JPEGEncodeParam j2dEP = null;
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if (colorModel instanceof IndexColorModel) {
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//
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// Need to expand the indexed data to components.
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// The convertToIntDiscrete method is used to perform this.
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//
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IndexColorModel icm = (IndexColorModel)colorModel;
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bi = icm.convertToIntDiscrete(wRas, false);
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j2dEP = com.sun.image.codec.jpeg.JPEGCodec.getDefaultJPEGEncodeParam(bi);
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} else {
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bi = new BufferedImage(colorModel, wRas, false, null);
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j2dEP = com.sun.image.codec.jpeg.JPEGCodec.getDefaultJPEGEncodeParam(bi);
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}
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// Now modify the Java2D encodeParam based on the options set
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// in the JAI encodeParam object.
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if (jaiEP != null) {
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modifyEncodeParam(jaiEP, j2dEP, numBands);
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}
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// Now create the encoder with the modified Java2D encodeParam
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com.sun.image.codec.jpeg.JPEGImageEncoder encoder;
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encoder = com.sun.image.codec.jpeg.JPEGCodec.createJPEGEncoder(
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output, j2dEP);
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try {
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// Write the image data.
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encoder.encode(bi);
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} catch(IOException e) {
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throw new RuntimeException(e.getMessage());
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}
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}
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}
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