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Apache XML Graphics Commons is a library that consists of several reusable components used by Apache Batik and Apache FOP. Many of these components can easily be used separately outside the domains of SVG and XSL-FO.

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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: ImageConverterBitmap2G2D.java 1681108 2015-05-22 13:26:12Z ssteiner $ */

package org.apache.xmlgraphics.image.loader.impl;

import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.awt.image.RenderedImage;
import java.util.Map;

import org.apache.xmlgraphics.image.loader.Image;
import org.apache.xmlgraphics.image.loader.ImageFlavor;
import org.apache.xmlgraphics.java2d.Graphics2DImagePainter;

/**
 * This ImageConverter wraps a bitmap image in a Graphics2D image.
 */
public class ImageConverterBitmap2G2D extends AbstractImageConverter {

    /** {@inheritDoc} */
    public Image convert(Image src, Map hints) {
        checkSourceFlavor(src);
        assert src instanceof ImageRendered;
        final ImageRendered rendImage = (ImageRendered)src;

        Graphics2DImagePainterImpl painter = new Graphics2DImagePainterImpl(rendImage);
        ImageGraphics2D g2dImage = new ImageGraphics2D(src.getInfo(), painter);
        return g2dImage;
    }

    static class Graphics2DImagePainterImpl implements Graphics2DImagePainter {
        ImageRendered rendImage;
        public Graphics2DImagePainterImpl(ImageRendered rendImage) {
            this.rendImage = rendImage;
        }
        public Dimension getImageSize() {
            return rendImage.getSize().getDimensionMpt();
        }
        public void paint(Graphics2D g2d, Rectangle2D area) {
            RenderedImage ri = rendImage.getRenderedImage();
            double w = area.getWidth();
            double h = area.getHeight();

            AffineTransform at = new AffineTransform();
            at.translate(area.getX(), area.getY());
            //Scale image to fit
            double sx = w / ri.getWidth();
            double sy = h / ri.getHeight();
            if (sx != 1.0 || sy != 1.0) {
                at.scale(sx, sy);
            }
            g2d.drawRenderedImage(ri, at);
        }
    }

    /** {@inheritDoc} */
    public ImageFlavor getSourceFlavor() {
        return ImageFlavor.RENDERED_IMAGE;
    }

    /** {@inheritDoc} */
    public ImageFlavor getTargetFlavor() {
        return ImageFlavor.GRAPHICS2D;
    }

}