/*
 * 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.Color;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.RenderedImage;
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.ImageRendered;
import org.apache.xmlgraphics.ps.FormGenerator;
import org.apache.xmlgraphics.ps.ImageEncoder;
import org.apache.xmlgraphics.ps.ImageEncodingHelper;
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 RenderedImage instances for PostScript output.
 */
public class PSImageHandlerRenderedImage implements PSImageHandler {

    private static final ImageFlavor[] FLAVORS = new ImageFlavor[] {
        ImageFlavor.BUFFERED_IMAGE,
        ImageFlavor.RENDERED_IMAGE
    };

    /** {@inheritDoc} */
    public void handleImage(RenderingContext context, Image image, Rectangle pos)
                throws IOException {
        PSRenderingContext psContext = (PSRenderingContext) context;
        PSGenerator gen = psContext.getGenerator();
        ImageRendered imageRend = (ImageRendered) 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.Double(x, y, w, h);

        RenderedImage ri = imageRend.getRenderedImage();

        if (ri instanceof BufferedImage && ri.getColorModel().hasAlpha()) {
            BufferedImage convertedImg = new BufferedImage(ri.getWidth(), ri.getHeight(), BufferedImage.TYPE_INT_RGB);
            Graphics2D g = (Graphics2D) convertedImg.getGraphics();
            g.setBackground(Color.WHITE);
            g.clearRect(0, 0, ri.getWidth(), ri.getHeight());
            g.drawImage((BufferedImage)ri, 0, 0, null);
            g.dispose();
            ri = convertedImg;
        }

        ImageEncoder encoder = ImageEncodingHelper.createRenderedImageEncoder(ri);
        Dimension imgDim = new Dimension(ri.getWidth(), ri.getHeight());
        String imgDescription = ri.getClass().getName();
        ImageEncodingHelper helper = new ImageEncodingHelper(ri);
        ColorModel cm = helper.getEncodedColorModel();

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

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

        RenderedImage ri = imageRend.getRenderedImage();
        FormGenerator formGen = new ImageFormGenerator(
                form.getName(), imageDescription,
                info.getSize().getDimensionPt(),
                ri, false);
        formGen.generate(gen);
    }

    /** {@inheritDoc} */
    public int getPriority() {
        return 300;
    }

    /** {@inheritDoc} */
    public Class getSupportedImageClass() {
        return ImageRendered.class;
    }

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

    /** {@inheritDoc} */
    public boolean isCompatible(RenderingContext targetContext, Image image) {
        return (image == null || image instanceof ImageRendered)
                && targetContext instanceof PSRenderingContext;
    }

}