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release system resources when calling javax.imageio.ImageIO in Picture.resize() 

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@833527 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Yegor Kozlov 2009-11-06 19:08:41 +00:00
parent 43af361c5c
commit 1aeb476ce7
4 changed files with 126 additions and 115 deletions
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1
src/documentation/content/xdocs/status.xml
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@ -34,6 +34,7 @@
<changes>
<release version="3.6-beta1" date="2009-??-??">
<action dev="POI-DEVELOPERS" type="fix">48134 - release system resources when using Picture.resize()</action>
<action dev="POI-DEVELOPERS" type="fix">48087 - avoid NPE in XSSFChartSheet when calling methods of the superclass</action>
<action dev="POI-DEVELOPERS" type="fix">48038 - handle reading HWPF stylesheets from non zero offsets</action>
<action dev="POI-DEVELOPERS" type="add">When running the "compile-ooxml-xsds" ant task, also generate the source jar for the OOXML Schemas</action>

59
src/java/org/apache/poi/hssf/usermodel/HSSFPicture.java
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@ -21,6 +21,7 @@ import org.apache.poi.ddf.EscherBSERecord;
import org.apache.poi.util.POILogFactory;
import org.apache.poi.util.POILogger;
import org.apache.poi.ss.usermodel.Picture;
import org.apache.poi.ss.util.ImageUtils;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
@ -208,29 +209,6 @@ public final class HSSFPicture extends HSSFSimpleShape implements Picture {
return cw == def ? PX_DEFAULT : PX_MODIFIED;
}
/**
* The metadata of PNG and JPEG can contain the width of a pixel in millimeters.
* Return the the "effective" dpi calculated as <code>25.4/HorizontalPixelSize</code>
* and <code>25.4/VerticalPixelSize</code>. Where 25.4 is the number of mm in inch.
*
* @return array of two elements: <code>{horisontalPdi, verticalDpi}</code>.
* {96, 96} is the default.
*/
protected int[] getResolution(ImageReader r) throws IOException {
int hdpi=96, vdpi=96;
double mm2inch = 25.4;
NodeList lst;
Element node = (Element)r.getImageMetadata(0).getAsTree("javax_imageio_1.0");
lst = node.getElementsByTagName("HorizontalPixelSize");
if(lst != null && lst.getLength() == 1) hdpi = (int)(mm2inch/Float.parseFloat(((Element)lst.item(0)).getAttribute("value")));
lst = node.getElementsByTagName("VerticalPixelSize");
if(lst != null && lst.getLength() == 1) vdpi = (int)(mm2inch/Float.parseFloat(((Element)lst.item(0)).getAttribute("value")));
return new int[]{hdpi, vdpi};
}
/**
* Return the dimension of this image
*
@ -240,39 +218,6 @@ public final class HSSFPicture extends HSSFSimpleShape implements Picture {
EscherBSERecord bse = _patriarch._sheet._book.getBSERecord(_pictureIndex);
byte[] data = bse.getBlipRecord().getPicturedata();
int type = bse.getBlipTypeWin32();
Dimension size = new Dimension();
switch (type){
//we can calculate the preferred size only for JPEG and PNG
//other formats like WMF, EMF and PICT are not supported in Java
case HSSFWorkbook.PICTURE_TYPE_JPEG:
case HSSFWorkbook.PICTURE_TYPE_PNG:
case HSSFWorkbook.PICTURE_TYPE_DIB:
try {
//read the image using javax.imageio.*
ImageInputStream iis = ImageIO.createImageInputStream( new ByteArrayInputStream(data) );
Iterator<ImageReader> i = ImageIO.getImageReaders( iis );
ImageReader r = i.next();
r.setInput( iis );
BufferedImage img = r.read(0);
int[] dpi = getResolution(r);
//if DPI is zero then assume standard 96 DPI
//since cannot divide by zero
if (dpi[0] == 0) dpi[0] = 96;
if (dpi[1] == 0) dpi[1] = 96;
size.width = img.getWidth()*96/dpi[0];
size.height = img.getHeight()*96/dpi[1];
} catch (IOException e){
//silently return if ImageIO failed to read the image
log.log(POILogger.WARN, e);
}
break;
}
return size;
return ImageUtils.getImageDimension(new ByteArrayInputStream(data), type);
}
}

116
src/java/org/apache/poi/ss/util/ImageUtils.java Executable file
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@ -0,0 +1,116 @@
/* ====================================================================
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.
==================================================================== */
package org.apache.poi.ss.util;
import org.w3c.dom.NodeList;
import org.w3c.dom.Element;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.util.POILogger;
import org.apache.poi.util.POILogFactory;
import javax.imageio.ImageReader;
import javax.imageio.ImageIO;
import javax.imageio.stream.ImageInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.Iterator;
/**
* @author Yegor Kozlov
*/
public class ImageUtils {
private static final POILogger logger = POILogFactory.getLogger(ImageUtils.class);
public static final int PIXEL_DPI = 96;
/**
* Return the dimension of this image
*
* @param is the stream containing the image data
* @param type type of the picture: {@link org.apache.poi.ss.usermodel.Workbook#PICTURE_TYPE_JPEG},
* {@link org.apache.poi.ss.usermodel.Workbook#PICTURE_TYPE_PNG} or {@link org.apache.poi.ss.usermodel.Workbook#PICTURE_TYPE_DIB}
*
* @return image dimension in pixels
*/
public static Dimension getImageDimension(InputStream is, int type){
Dimension size = new Dimension();
switch (type){
//we can calculate the preferred size only for JPEG, PNG and BMP
//other formats like WMF, EMF and PICT are not supported in Java
case Workbook.PICTURE_TYPE_JPEG:
case Workbook.PICTURE_TYPE_PNG:
case Workbook.PICTURE_TYPE_DIB:
try {
//read the image using javax.imageio.*
ImageInputStream iis = ImageIO.createImageInputStream( is );
Iterator i = ImageIO.getImageReaders( iis );
ImageReader r = (ImageReader) i.next();
r.setInput( iis );
BufferedImage img = r.read(0);
int[] dpi = getResolution(r);
//if DPI is zero then assume standard 96 DPI
//since cannot divide by zero
if (dpi[0] == 0) dpi[0] = PIXEL_DPI;
if (dpi[1] == 0) dpi[1] = PIXEL_DPI;
size.width = img.getWidth()*PIXEL_DPI/dpi[0];
size.height = img.getHeight()*PIXEL_DPI/dpi[1];
r.dispose();
iis.close();
} catch (IOException e){
//silently return if ImageIO failed to read the image
logger.log(POILogger.WARN, e);
}
break;
default:
logger.log(POILogger.WARN, "Only JPEG, PNG and DIB pictures can be automatically sized");
}
return size;
}
/**
* The metadata of PNG and JPEG can contain the width of a pixel in millimeters.
* Return the the "effective" dpi calculated as <code>25.4/HorizontalPixelSize</code>
* and <code>25.4/VerticalPixelSize</code>. Where 25.4 is the number of mm in inch.
*
* @return array of two elements: <code>{horisontalPdi, verticalDpi}</code>.
* {96, 96} is the default.
*/
public static int[] getResolution(ImageReader r) throws IOException {
int hdpi=96, vdpi=96;
double mm2inch = 25.4;
NodeList lst;
Element node = (Element)r.getImageMetadata(0).getAsTree("javax_imageio_1.0");
lst = node.getElementsByTagName("HorizontalPixelSize");
if(lst != null && lst.getLength() == 1) hdpi = (int)(mm2inch/Float.parseFloat(((Element)lst.item(0)).getAttribute("value")));
lst = node.getElementsByTagName("VerticalPixelSize");
if(lst != null && lst.getLength() == 1) vdpi = (int)(mm2inch/Float.parseFloat(((Element)lst.item(0)).getAttribute("value")));
return new int[]{hdpi, vdpi};
}
}

65
src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFPicture.java
View File

@ -31,6 +31,7 @@ import org.apache.poi.openxml4j.opc.PackagePart;
import org.apache.poi.openxml4j.opc.PackageRelationship;
import org.apache.poi.ss.usermodel.Picture;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.util.ImageUtils;
import org.apache.poi.util.POILogFactory;
import org.apache.poi.util.POILogger;
import org.openxmlformats.schemas.drawingml.x2006.main.CTBlipFillProperties;
@ -277,65 +278,13 @@ public final class XSSFPicture extends XSSFShape implements Picture {
* @return image dimension in pixels
*/
protected static Dimension getImageDimension(PackagePart part, int type){
Dimension size = new Dimension();
switch (type){
//we can calculate the preferred size only for JPEG, PNG and BMP
//other formats like WMF, EMF and PICT are not supported in Java
case Workbook.PICTURE_TYPE_JPEG:
case Workbook.PICTURE_TYPE_PNG:
case Workbook.PICTURE_TYPE_DIB:
try {
//read the image using javax.imageio.*
ImageInputStream iis = ImageIO.createImageInputStream( part.getInputStream() );
Iterator i = ImageIO.getImageReaders( iis );
ImageReader r = (ImageReader) i.next();
r.setInput( iis );
BufferedImage img = r.read(0);
int[] dpi = getResolution(r);
//if DPI is zero then assume standard 96 DPI
//since cannot divide by zero
if (dpi[0] == 0) dpi[0] = PIXEL_DPI;
if (dpi[1] == 0) dpi[1] = PIXEL_DPI;
size.width = img.getWidth()*PIXEL_DPI/dpi[0];
size.height = img.getHeight()*PIXEL_DPI/dpi[1];
} catch (IOException e){
//silently return if ImageIO failed to read the image
logger.log(POILogger.WARN, e);
}
break;
default:
logger.log(POILogger.WARN, "Only JPEG, PNG and DIB pictures can be automatically sized");
try {
return ImageUtils.getImageDimension(part.getInputStream(), type);
} catch (IOException e){
//return a "singulariry" if ImageIO failed to read the image
logger.log(POILogger.WARN, e);
return new Dimension();
}
return size;
}
/**
* The metadata of PNG and JPEG can contain the width of a pixel in millimeters.
* Return the the "effective" dpi calculated as <code>25.4/HorizontalPixelSize</code>
* and <code>25.4/VerticalPixelSize</code>. Where 25.4 is the number of mm in inch.
*
* @return array of two elements: <code>{horisontalPdi, verticalDpi}</code>.
* {96, 96} is the default.
*/
protected static int[] getResolution(ImageReader r) throws IOException {
int hdpi = PIXEL_DPI, vdpi = PIXEL_DPI;
double mm2inch = 25.4;
NodeList lst;
Element node = (Element)r.getImageMetadata(0).getAsTree("javax_imageio_1.0");
lst = node.getElementsByTagName("HorizontalPixelSize");
if(lst != null && lst.getLength() == 1) hdpi = (int)(mm2inch/Float.parseFloat(((Element)lst.item(0)).getAttribute("value")));
lst = node.getElementsByTagName("VerticalPixelSize");
if(lst != null && lst.getLength() == 1) vdpi = (int)(mm2inch/Float.parseFloat(((Element)lst.item(0)).getAttribute("value")));
return new int[]{hdpi, vdpi};
}
/**