/*
 * 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: AbstractPSTranscoder.java 1805173 2017-08-16 10:50:04Z ssteiner $ */

package org.apache.fop.render.ps;


import java.awt.Color;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import org.w3c.dom.Document;
import org.w3c.dom.svg.SVGLength;

import org.apache.batik.bridge.BridgeContext;
import org.apache.batik.bridge.UnitProcessor;
import org.apache.batik.transcoder.TranscoderException;
import org.apache.batik.transcoder.TranscoderOutput;
import org.apache.batik.transcoder.image.ImageTranscoder;

import org.apache.xmlgraphics.java2d.ps.AbstractPSDocumentGraphics2D;

import org.apache.fop.apps.FOPException;
import org.apache.fop.fonts.FontInfo;
import org.apache.fop.svg.AbstractFOPTranscoder;
import org.apache.fop.svg.PDFDocumentGraphics2DConfigurator;
import org.apache.fop.svg.font.FOPFontFamilyResolverImpl;

This class enables to transcode an input to a PostScript document.
Two transcoding hints (KEY_WIDTH and
KEY_HEIGHT) can be used to respectively specify the image
width and the image height. If only one of these keys is specified,
the transcoder preserves the aspect ratio of the original image.
The KEY_BACKGROUND_COLOR defines the background color
to use for opaque image formats, or the background color that may
be used for image formats that support alpha channel.
The KEY_AOI represents the area of interest to paint
in device space.
Three additional transcoding hints that act on the SVG
processor can be specified:
KEY_LANGUAGE to set the default language to use (may be
used by a <switch> SVG element for example),
KEY_USER_STYLESHEET_URI to fix the URI of a user
stylesheet, and KEY_PIXEL_TO_MM to specify the pixel to
millimeter conversion factor.
This work was authored by Keiron Liddle (keiron@aftexsw.com).
/**
 * <p>This class enables to transcode an input to a PostScript document.</p>
 *
 * <p>Two transcoding hints (<code>KEY_WIDTH</code> and
 * <code>KEY_HEIGHT</code>) can be used to respectively specify the image
 * width and the image height. If only one of these keys is specified,
 * the transcoder preserves the aspect ratio of the original image.
 *
 * <p>The <code>KEY_BACKGROUND_COLOR</code> defines the background color
 * to use for opaque image formats, or the background color that may
 * be used for image formats that support alpha channel.
 *
 * <p>The <code>KEY_AOI</code> represents the area of interest to paint
 * in device space.
 *
 * <p>Three additional transcoding hints that act on the SVG
 * processor can be specified:
 *
 * <p><code>KEY_LANGUAGE</code> to set the default language to use (may be
 * used by a &lt;switch&gt; SVG element for example),
 * <code>KEY_USER_STYLESHEET_URI</code> to fix the URI of a user
 * stylesheet, and <code>KEY_PIXEL_TO_MM</code> to specify the pixel to
 * millimeter conversion factor.
 *
 * <p>This work was authored by Keiron Liddle (keiron@aftexsw.com).</p>
 */
public abstract class AbstractPSTranscoder extends AbstractFOPTranscoder {

    
the root Graphics2D instance for generating PostScript /** the root Graphics2D instance for generating PostScript */
    protected AbstractPSDocumentGraphics2D graphics;

    private FontInfo fontInfo;

    
Constructs a new AbstractPSTranscoder. /**
     * Constructs a new {@link AbstractPSTranscoder}.
     */
    public AbstractPSTranscoder() {
        super();
    }

    
Creates the root Graphics2D instance for generating PostScript.
Returns:
the root Graphics2D/**
     * Creates the root Graphics2D instance for generating PostScript.
     * @return the root Graphics2D
     */
    protected abstract AbstractPSDocumentGraphics2D createDocumentGraphics2D();

    
{@inheritDoc} /** {@inheritDoc} */
    protected boolean getAutoFontsDefault() {
        //Currently set to false because auto-fonts requires a lot of memory in the PostScript
        //case: All fonts (even the unsupported TTF fonts) need to be loaded and TrueType loading
        //is currently very memory-intensive. At default JVM memory settings, this would result
        //in OutOfMemoryErrors otherwise.
        return false;
    }

    
Transcodes the specified Document as an image in the specified output.
Params:
document – the document to transcode
uri – the uri of the document or null if any
output – the ouput where to transcode
Throws:
TranscoderException – if an error occured while transcoding/**
     * Transcodes the specified Document as an image in the specified output.
     *
     * @param document the document to transcode
     * @param uri the uri of the document or null if any
     * @param output the ouput where to transcode
     * @exception TranscoderException if an error occured while transcoding
     */
    protected void transcode(Document document, String uri,
                             TranscoderOutput output)
        throws TranscoderException {

        graphics = createDocumentGraphics2D();
        if (!isTextStroked()) {
            try {
                boolean useComplexScriptFeatures = false; //TODO - FIX ME
                this.fontInfo = PDFDocumentGraphics2DConfigurator.createFontInfo(
                        getEffectiveConfiguration(), useComplexScriptFeatures);
                graphics.setCustomTextHandler(new NativeTextHandler(graphics, fontInfo));
                ((FOPTranscoderUserAgent) userAgent).setFontFamilyResolver(
                        new FOPFontFamilyResolverImpl(fontInfo));
            } catch (FOPException fe) {
                throw new TranscoderException(fe);
            }
        }

        super.transcode(document, uri, output);

        getLogger().trace("document size: " + width + " x " + height);

        // prepare the image to be painted
        UnitProcessor.Context uctx = UnitProcessor.createContext(ctx,
                    document.getDocumentElement());
        float widthInPt = UnitProcessor.userSpaceToSVG(width, SVGLength.SVG_LENGTHTYPE_PT,
                    UnitProcessor.HORIZONTAL_LENGTH, uctx);
        int w = (int)(widthInPt + 0.5);
        float heightInPt = UnitProcessor.userSpaceToSVG(height, SVGLength.SVG_LENGTHTYPE_PT,
                UnitProcessor.HORIZONTAL_LENGTH, uctx);
        int h = (int)(heightInPt + 0.5);
        getLogger().trace("document size: " + w + "pt x " + h + "pt");

        try {
            OutputStream out = output.getOutputStream();
            if (!(out instanceof BufferedOutputStream)) {
                out = new BufferedOutputStream(out);
            }
            graphics.setupDocument(out, w, h);
            graphics.setViewportDimension(width, height);

            if (hints.containsKey(ImageTranscoder.KEY_BACKGROUND_COLOR)) {
                graphics.setBackgroundColor(
                    (Color)hints.get(ImageTranscoder.KEY_BACKGROUND_COLOR));
        }
            graphics.setGraphicContext(
                new org.apache.xmlgraphics.java2d.GraphicContext());
            graphics.setTransform(curTxf);

            this.root.paint(graphics);

            graphics.finish();
        } catch (IOException ex) {
            throw new TranscoderException(ex);
        }
    }

    
{@inheritDoc} /** {@inheritDoc} */
    protected BridgeContext createBridgeContext() {
        //For compatibility with Batik 1.6
        return createBridgeContext("1.x");
    }

    
{@inheritDoc} /** {@inheritDoc} */
    public BridgeContext createBridgeContext(String version) {
        BridgeContext ctx = new PSBridgeContext(userAgent, (isTextStroked() ? null : fontInfo),
                getImageManager(), getImageSessionContext());
        return ctx;
    }

}