src/java/org/apache/fop/render/ps/PSImageHandlerRawPNG.java

/*
 * 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.ps;

import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.geom.Rectangle2D;
import java.awt.image.ColorModel;
import java.io.IOException;

import org.apache.xmlgraphics.image.loader.Image;
import org.apache.xmlgraphics.image.loader.ImageFlavor;
import org.apache.xmlgraphics.image.loader.ImageInfo;
import org.apache.xmlgraphics.image.loader.impl.ImageRawPNG;
import org.apache.xmlgraphics.ps.FormGenerator;
import org.apache.xmlgraphics.ps.ImageEncoder;
import org.apache.xmlgraphics.ps.ImageFormGenerator;
import org.apache.xmlgraphics.ps.PSGenerator;
import org.apache.xmlgraphics.ps.PSImageUtils;

import org.apache.fop.render.RenderingContext;

/**
 * Image handler implementation which handles raw (not decoded) PNG images for PostScript output.
 */
public class PSImageHandlerRawPNG implements PSImageHandler {

    private static final ImageFlavor[] FLAVORS = new ImageFlavor[] {ImageFlavor.RAW_PNG};

    /** {@inheritDoc} */
    public void handleImage(RenderingContext context, Image image, Rectangle pos) throws IOException {
        PSRenderingContext psContext = (PSRenderingContext) context;
        PSGenerator gen = psContext.getGenerator();
        ImageRawPNG png = (ImageRawPNG) image;

        float x = (float) pos.getX() / 1000f;
        float y = (float) pos.getY() / 1000f;
        float w = (float) pos.getWidth() / 1000f;
        float h = (float) pos.getHeight() / 1000f;
        Rectangle2D targetRect = new Rectangle2D.Float(x, y, w, h);

        ImageEncoder encoder = new ImageEncoderPNG(png);
        ImageInfo info = image.getInfo();
        Dimension imgDim = info.getSize().getDimensionPx();
        String imgDescription = image.getClass().getName();
        ColorModel cm = png.getColorModel();

        PSImageUtils.writeImage(encoder, imgDim, imgDescription, targetRect, cm, gen);
    }

    /** {@inheritDoc} */
    public void generateForm(RenderingContext context, Image image, PSImageFormResource form)
            throws IOException {
        PSRenderingContext psContext = (PSRenderingContext) context;
        PSGenerator gen = psContext.getGenerator();
        ImageRawPNG png = (ImageRawPNG) image;
        ImageInfo info = image.getInfo();
        String imageDescription = info.getMimeType() + " " + info.getOriginalURI();

        ImageEncoder encoder = new ImageEncoderPNG(png);
        FormGenerator formGen = new ImageFormGenerator(form.getName(), imageDescription, info.getSize()
                .getDimensionPt(), info.getSize().getDimensionPx(), encoder, png.getColorSpace(),
                false);
        formGen.generate(gen);
    }

    /** {@inheritDoc} */
    public int getPriority() {
        return 200;
    }

    /** {@inheritDoc} */
    public Class<ImageRawPNG> getSupportedImageClass() {
        return ImageRawPNG.class;
    }

    /** {@inheritDoc} */
    public ImageFlavor[] getSupportedImageFlavors() {
        return FLAVORS;
    }

    /** {@inheritDoc} */
    public boolean isCompatible(RenderingContext targetContext, Image image) {
        if (targetContext instanceof PSRenderingContext) {
            PSRenderingContext psContext = (PSRenderingContext) targetContext;
            // The filters required for this implementation need PS level 2 or higher
            if (psContext.getGenerator().getPSLevel() >= 2) {
                return (image == null || image instanceof ImageRawPNG);
            }
        }
        return false;
    }

}