poi/src/scratchpad/testcases/org/apache/poi/hslf/usermodel/TestFontRendering.java

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   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
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       http://www.apache.org/licenses/LICENSE-2.0

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   distributed under the License is distributed on an "AS IS" BASIS,
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   See the License for the specific language governing permissions and
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package org.apache.poi.hslf.usermodel;

import static org.junit.Assert.assertTrue;
import static org.junit.Assume.assumeTrue;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.GraphicsEnvironment;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferByte;
import java.io.File;
import java.io.InputStream;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

import javax.imageio.ImageIO;

import org.apache.poi.POIDataSamples;
import org.apache.poi.hslf.model.Slide;
import org.apache.poi.hslf.model.TextPainter;
import org.junit.Test;

/**
 * Test font rendering of alternative and fallback fonts
 */
public class TestFontRendering {
    private static POIDataSamples slTests = POIDataSamples.getSlideShowInstance();

    @Test
    public void bug55902mixedFontWithChineseCharacters() throws Exception {
        // font files need to be downloaded first via
        // ant test-scratchpad-download-resources
        String fontFiles[][] = {
            // Calibri is not available on *nix systems, so we need to use another similar free font
            { "build/scratchpad-test-resources/Cabin-Regular.ttf", "mapped", "Calibri" },

            // use "MS PGothic" if available (Windows only) ...
            // for the junit test not all chars are rendered
            { "build/scratchpad-test-resources/mona.ttf", "fallback", "Cabin" }
        };
        
        // setup fonts (especially needed, when run under *nix systems)
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        Map<String,String> fontMap = new HashMap<String,String>();
        Map<String,String> fallbackMap = new HashMap<String,String>();
        
        for (String fontFile[] : fontFiles) {
            File f = new File(fontFile[0]);
            assumeTrue("necessary font file "+f.getName()+" not downloaded.", f.exists());
            
            Font font = Font.createFont(Font.TRUETYPE_FONT, f);
            ge.registerFont(font);
            
            Map<String,String> map = ("mapped".equals(fontFile[1]) ? fontMap : fallbackMap);
            map.put(fontFile[2], font.getFamily());
        }
        
        InputStream is = slTests.openResourceAsStream("bug55902-mixedFontChineseCharacters.ppt");
        SlideShow ss = new SlideShow(is);
        is.close();
        
        Dimension pgsize = ss.getPageSize();
        
        Slide slide = ss.getSlides()[0];
        
        // render it
        double zoom = 1;
        AffineTransform at = new AffineTransform();
        at.setToScale(zoom, zoom);
        
        BufferedImage imgActual = new BufferedImage((int)Math.ceil(pgsize.width*zoom), (int)Math.ceil(pgsize.height*zoom), BufferedImage.TYPE_3BYTE_BGR);
        Graphics2D graphics = imgActual.createGraphics();
        graphics.setRenderingHint(TextPainter.KEY_FONTFALLBACK, fallbackMap);
        graphics.setRenderingHint(TextPainter.KEY_FONTMAP, fontMap);
        graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        graphics.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
        graphics.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
        graphics.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
        graphics.setTransform(at);                
        graphics.setPaint(Color.white);
        graphics.fill(new Rectangle2D.Float(0, 0, pgsize.width, pgsize.height));
        slide.draw(graphics);             
        
        BufferedImage imgExpected = ImageIO.read(slTests.getFile("bug55902-mixedChars.png"));
        DataBufferByte expectedDB = (DataBufferByte)imgExpected.getRaster().getDataBuffer();
        DataBufferByte actualDB = (DataBufferByte)imgActual.getRaster().getDataBuffer();
        assertTrue(Arrays.equals(expectedDB.getData(0), actualDB.getData(0)));
    }
}