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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
package org.apache.fop.image;
// Java
import java.awt.image.ImageProducer;
import java.awt.image.ColorModel;
import java.awt.image.IndexColorModel;
import java.awt.color.ColorSpace;
import java.awt.Color;
import java.io.InputStream;
import java.io.IOException;
import java.net.URLConnection;
import org.apache.commons.io.IOUtils;
/**
* FopImage object for GIF images, using Java native classes.
* @author Eric SCHAEFFER
* @author Modified by Eric Dalquist - 9/14/2001 - ebdalqui@mtu.edu
* @see AbstractFopImage
* @see FopImage
*/
public class GifImage extends AbstractFopImage {
/**
* Create a new gif image.
*
* @param imgInfo the image info for this gif image
*/
public GifImage(FopImage.ImageInfo imgInfo) {
super(imgInfo);
}
/**
* Load the bitmap for this gif image.
* This loads the data and creates a bitmap byte array
* of the image data.
* To decode the image a dummy URLConnection is used that
* will do the conversion.
*
* @return True if the load process succeeded
*/
protected boolean loadBitmap() {
int[] tmpMap = null;
try {
URLConnection con = new DummyConnection(inputStream);
ImageProducer ip = (ImageProducer) con.getContent();
if (ip == null) {
return false;
}
FopImageConsumer consumer = new FopImageConsumer(ip);
ip.startProduction(consumer);
//Load the image into memory
while (!consumer.isImageReady()) {
Thread.sleep(500);
}
this.height = consumer.getHeight();
this.width = consumer.getWidth();
try {
tmpMap = consumer.getImage();
} catch (Exception ex) {
log.error("Image grabbing interrupted : "
+ ex.getMessage(), ex);
return false;
}
ColorModel cm = consumer.getColorModel();
this.bitsPerPixel = 8;
// this.bitsPerPixel = cm.getPixelSize();
this.colorSpace = ColorSpace.getInstance(ColorSpace.CS_LINEAR_RGB);
if (cm.hasAlpha()) {
// java.awt.Transparency. BITMASK or OPAQUE or TRANSLUCENT
int transparencyType = cm.getTransparency();
if (transparencyType == java.awt.Transparency.OPAQUE) {
this.isTransparent = false;
} else if (transparencyType == java.awt.Transparency.BITMASK) {
if (cm instanceof IndexColorModel) {
IndexColorModel indexcm = (IndexColorModel) cm;
this.isTransparent = false;
byte[] alphas = new byte[indexcm.getMapSize()];
byte[] reds = new byte[indexcm.getMapSize()];
byte[] greens = new byte[indexcm.getMapSize()];
byte[] blues = new byte[indexcm.getMapSize()];
indexcm.getAlphas(alphas);
indexcm.getReds(reds);
indexcm.getGreens(greens);
indexcm.getBlues(blues);
for (int i = 0;
i < indexcm.getMapSize();
i++) {
if ((alphas[i] & 0xFF) == 0) {
this.isTransparent = true;
this.transparentColor = new Color(
(int)(reds[i] & 0xFF),
(int)(greens[i] & 0xFF),
(int)(blues[i] & 0xFF));
break;
}
}
} else {
// TRANSLUCENT
/*
* this.isTransparent = false;
* for (int i = 0; i < this.width * this.height; i++) {
* if (cm.getAlpha(tmpMap[i]) == 0) {
* this.isTransparent = true;
* this.transparentColor = new PDFColor(cm.getRed(tmpMap[i]),
* cm.getGreen(tmpMap[i]), cm.getBlue(tmpMap[i]));
* break;
* }
* }
*/
// use special API...
this.isTransparent = false;
}
} else {
this.isTransparent = false;
}
} else {
this.isTransparent = false;
}
} catch (Exception ex) {
log.error("Error while loading image (Gif): " + ex.getMessage(), ex);
return false;
} finally {
IOUtils.closeQuietly(inputStream);
inputStream = null;
}
// Should take care of the ColorSpace and bitsPerPixel
this.bitmaps = new byte[this.width * this.height * 3];
for (int i = 0; i < this.height; i++) {
for (int j = 0; j < this.width; j++) {
int p = tmpMap[i * this.width + j];
int r = (p >> 16) & 0xFF;
int g = (p >> 8) & 0xFF;
int b = (p) & 0xFF;
this.bitmaps[3 * (i * this.width + j)] = (byte)(r & 0xFF);
this.bitmaps[3 * (i * this.width + j) + 1] = (byte)(g & 0xFF);
this.bitmaps[3 * (i * this.width + j) + 2] = (byte)(b & 0xFF);
}
}
return true;
}
/** @see org.apache.fop.image.AbstractFopImage#loadOriginalData() */
protected boolean loadOriginalData() {
return loadDefaultOriginalData();
}
/**
* A dummy url connection for a gif image in an input stream.
*/
protected static class DummyConnection extends URLConnection {
private InputStream inputStream;
DummyConnection(InputStream is) {
super(null);
inputStream = is;
}
/**
* @see java.net.URLConnection#getInputStream()
*/
public InputStream getInputStream() throws IOException {
return inputStream;
}
/**
* @see java.net.URLConnection#connect()
*/
public void connect() throws IOException {
// do nothing
}
/**
* @see java.net.URLConnection#getContentType()
*/
public String getContentType() {
return "image/gif";
}
/**
* @see java.net.URLConnection#getContentLength()
*/
public int getContentLength() {
try {
return inputStream.available();
} catch (IOException e) {
return -1;
}
}
}
}
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