/*
* BrandedPreviewJPEGFilter.java
*
* Version: $Revision: 3733 $
*
* Date: $Date: 2009-04-24 03:52:11 +0000 (Fri, 24 Apr 2009) $
*
* Copyright (c) 2002-2009, The DSpace Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - 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.
*
* - Neither the name of the DSpace Foundation nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
* HOLDERS 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.
*/
package org.dspace.app.mediafilter;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.awt.Font;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import org.dspace.content.Bitstream;
import org.dspace.content.BitstreamFormat;
import org.dspace.content.Bundle;
import org.dspace.content.Item;
import org.dspace.core.Context;
import javax.imageio.ImageIO;
import org.dspace.core.ConfigurationManager;
/**
* Filter image bitstreams, scaling the image to be within the bounds of
* thumbnail.maxwidth, thumbnail.maxheight, the size we want our thumbnail to be
* no bigger than. Creates only JPEGs.
*/
public class BrandedPreviewJPEGFilter extends MediaFilter
{
public String getFilteredName(String oldFilename)
{
return oldFilename + ".preview.jpg";
}
/**
* @return String bundle name
*
*/
public String getBundleName()
{
return "BRANDED_PREVIEW";
}
/**
* @return String bitstreamformat
*/
public String getFormatString()
{
return "JPEG";
}
/**
* @return String description
*/
public String getDescription()
{
return "Generated Branded Preview";
}
/**
* @param source
* source input stream
*
* @return InputStream the resulting input stream
*/
public InputStream getDestinationStream(InputStream source)
throws Exception
{
// read in bitstream's image
BufferedImage buf = ImageIO.read(source);
// get config params
float xmax = (float) ConfigurationManager
.getIntProperty("webui.preview.maxwidth");
float ymax = (float) ConfigurationManager
.getIntProperty("webui.preview.maxheight");
int brandHeight = ConfigurationManager.getIntProperty("webui.preview.brand.height");
String brandFont = ConfigurationManager.getProperty("webui.preview.brand.font");
int brandFontPoint = ConfigurationManager.getIntProperty("webui.preview.brand.fontpoint");
// now get the image dimensions
float xsize = (float) buf.getWidth(null);
float ysize = (float) buf.getHeight(null);
// if verbose flag is set, print out dimensions
// to STDOUT
if (MediaFilterManager.isVerbose)
{
System.out.println("original size: " + xsize + "," + ysize);
}
// scale by x first if needed
if (xsize > xmax)
{
// calculate scaling factor so that xsize * scale = new size (max)
float scale_factor = xmax / xsize;
// if verbose flag is set, print out extracted text
// to STDOUT
if (MediaFilterManager.isVerbose)
{
System.out.println("x scale factor: " + scale_factor);
}
// now reduce x size
// and y size
xsize = xsize * scale_factor;
ysize = ysize * scale_factor;
// if verbose flag is set, print out extracted text
// to STDOUT
if (MediaFilterManager.isVerbose)
{
System.out.println("new size: " + xsize + "," + ysize);
}
}
// scale by y if needed
if (ysize > ymax)
{
float scale_factor = ymax / ysize;
// now reduce x size
// and y size
xsize = xsize * scale_factor;
ysize = ysize * scale_factor;
}
// if verbose flag is set, print details to STDOUT
if (MediaFilterManager.isVerbose)
{
System.out.println("created thumbnail size: " + xsize + ", "
+ ysize);
}
// create an image buffer for the preview with the new xsize, ysize
// we add
BufferedImage branded = new BufferedImage((int) xsize, (int) ysize + brandHeight,
BufferedImage.TYPE_INT_RGB);
// now render the image into the preview buffer
Graphics2D g2d = branded.createGraphics();
g2d.drawImage(buf, 0, 0, (int) xsize, (int) ysize, null);
Brand brand = new Brand((int) xsize, brandHeight, new Font(brandFont, Font.PLAIN, brandFontPoint), 5);
BufferedImage brandImage = brand.create(ConfigurationManager.getProperty("webui.preview.brand"),
ConfigurationManager.getProperty("webui.preview.brand.abbrev"),
MediaFilterManager.getCurrentItem() == null ? "" : "hdl:" + MediaFilterManager.getCurrentItem().getHandle());
g2d.drawImage(brandImage, (int)0, (int)ysize, (int) xsize, (int) 20, null);
// now create an input stream for the thumbnail buffer and return it
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(branded, "jpeg", baos);
// now get the array
ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
return bais; // hope this gets written out before its garbage collected!
}
}