/*
* 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: ImageConverterG2D2Bitmap.java 606580 2007-12-23 17:45:02Z jeremias $ */
package org.apache.xmlgraphics.image.loader.impl;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.RenderingHints;
import java.awt.Transparency;
import java.awt.color.ColorSpace;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.ComponentColorModel;
import java.awt.image.DataBuffer;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
import java.util.Map;
import org.apache.xmlgraphics.image.loader.Image;
import org.apache.xmlgraphics.image.loader.ImageFlavor;
import org.apache.xmlgraphics.image.loader.ImageProcessingHints;
import org.apache.xmlgraphics.image.loader.ImageSize;
import org.apache.xmlgraphics.util.UnitConv;
/**
* This ImageConverter converts Graphics2D images to a BufferedImage.
*/
public class ImageConverterG2D2Bitmap extends AbstractImageConverter {
/** {@inheritDoc} */
public Image convert(Image src, Map hints) {
checkSourceFlavor(src);
ImageGraphics2D g2dImage = (ImageGraphics2D)src;
//TODO Make configurable!
boolean gray = false;
boolean withAlpha = true;
int resolution = 300; //default: 300dpi
Number res = (Number)hints.get(ImageProcessingHints.TARGET_RESOLUTION);
if (res != null) {
resolution = res.intValue();
}
BufferedImage bi = paintToBufferedImage(g2dImage, gray, withAlpha, resolution);
ImageBuffered bufImage = new ImageBuffered(src.getInfo(), bi, null);
return bufImage;
}
/**
* Paints a Graphics2D image on a BufferedImage and returns this bitmap.
* @param g2dImage the Graphics2D image
* @param gray true if the generated image should be in grayscales
* @param withAlpha true if the generated image should have an alpha channel
* @param resolution the requested bitmap resolution
* @return the newly created BufferedImage
*/
protected BufferedImage paintToBufferedImage(ImageGraphics2D g2dImage,
boolean gray, boolean withAlpha, int resolution) {
ImageSize size = g2dImage.getSize();
int bmw = (int)Math.ceil(UnitConv.mpt2px(size.getWidthMpt(), resolution));
int bmh = (int)Math.ceil(UnitConv.mpt2px(size.getHeightMpt(), resolution));
BufferedImage bi;
if (gray) {
if (withAlpha) {
bi = createGrayBufferedImageWithAlpha(bmw, bmh);
} else {
bi = new BufferedImage(bmw, bmh, BufferedImage.TYPE_BYTE_GRAY);
}
} else {
if (withAlpha) {
bi = new BufferedImage(bmw, bmh, BufferedImage.TYPE_INT_ARGB);
} else {
bi = new BufferedImage(bmw, bmh, BufferedImage.TYPE_INT_RGB);
}
}
Graphics2D g2d = bi.createGraphics();
try {
g2d.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS,
RenderingHints.VALUE_FRACTIONALMETRICS_ON);
setRenderingHintsForBufferedImage(g2d);
g2d.setBackground(Color.white);
g2d.setColor(Color.black);
if (!withAlpha) {
g2d.clearRect(0, 0, bmw, bmh);
}
/* debug code
int off = 2;
g2d.drawLine(off, 0, off, bmh);
g2d.drawLine(bmw - off, 0, bmw - off, bmh);
g2d.drawLine(0, off, bmw, off);
g2d.drawLine(0, bmh - off, bmw, bmh - off);
*/
double sx = (double)bmw / size.getWidthMpt();
double sy = (double)bmh / size.getHeightMpt();
g2d.scale(sx, sy);
//Paint the image on the BufferedImage
Rectangle2D area = new Rectangle2D.Double(
0.0, 0.0, size.getWidthMpt(), size.getHeightMpt());
g2dImage.getGraphics2DImagePainter().paint(g2d, area);
} finally {
g2d.dispose();
}
return bi;
}
private static BufferedImage createGrayBufferedImageWithAlpha(int width, int height) {
BufferedImage bi;
boolean alphaPremultiplied = true;
int bands = 2;
int[] bits = new int[bands];
for (int i = 0; i < bands; i++) {
bits[i] = 8;
}
ColorModel cm = new ComponentColorModel(
ColorSpace.getInstance(ColorSpace.CS_GRAY),
bits,
true, alphaPremultiplied,
Transparency.TRANSLUCENT,
DataBuffer.TYPE_BYTE);
WritableRaster wr = Raster.createInterleavedRaster(
DataBuffer.TYPE_BYTE,
width, height, bands,
new Point(0, 0));
bi = new BufferedImage(cm, wr, alphaPremultiplied, null);
return bi;
}
/**
* Sets rendering hints on the Graphics2D created for painting to a BufferedImage. Subclasses
* can modify the settings to customize the behaviour.
* @param g2d the Graphics2D instance
*/
protected void setRenderingHintsForBufferedImage(Graphics2D g2d) {
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_OFF);
g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,
RenderingHints.VALUE_TEXT_ANTIALIAS_OFF);
}
/** {@inheritDoc} */
public ImageFlavor getSourceFlavor() {
return ImageFlavor.GRAPHICS2D;
}
/** {@inheritDoc} */
public ImageFlavor getTargetFlavor() {
return ImageFlavor.BUFFERED_IMAGE;
}
}