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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.render;
import java.awt.Color;
import java.awt.Dimension;
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 org.apache.fop.util.UnitConv;
/**
* Abstract base class for ImageHandler implementations that process Java2D images through
* the Graphics2DImagePainter interface.
*/
public abstract class AbstractImageHandlerGraphics2D implements ImageHandler {
/**
* Paints the image to a BufferedImage and returns that.
* @param painter the painter which will paint the actual image
* @param context the renderer context for the current renderer
* @param targetDimension the target dimensions of the image to be converted to a bitmap
* @param resolution the requested bitmap resolution
* @param gray true if the generated image should be in grayscales
* @param withAlpha true if an alpha channel should be created
* @return the generated BufferedImage
*/
protected BufferedImage paintToBufferedImage(
org.apache.xmlgraphics.java2d.Graphics2DImagePainter painter,
Dimension targetDimension,
int resolution, boolean gray, boolean withAlpha) {
int bmw = (int)Math.ceil(UnitConv.mpt2px(targetDimension.getWidth(), resolution));
int bmh = (int)Math.ceil(UnitConv.mpt2px(targetDimension.getHeight(), 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 / targetDimension.getWidth();
double sy = (double)bmh / targetDimension.getHeight();
g2d.scale(sx, sy);
//Paint the image on the BufferedImage
Rectangle2D area = new Rectangle2D.Double(
0.0, 0.0, targetDimension.getWidth(), targetDimension.getHeight());
painter.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 behavior.
* @param g2d the Graphics2D instance
*/
protected void setRenderingHintsForBufferedImage(Graphics2D g2d) {
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,
RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
}
}
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