log4j/src/ooxml/testcases/org/apache/poi/xslf/usermodel/TestXSLFTheme.java

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   this work for additional information regarding copyright ownership.
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package org.apache.poi.xslf.usermodel;

import static org.apache.poi.sl.usermodel.BaseTestSlideShow.getColor;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertNull;
import static org.junit.jupiter.api.Assertions.assertTrue;

import java.awt.Color;
import java.util.List;

import org.apache.poi.sl.usermodel.PaintStyle;
import org.apache.poi.sl.usermodel.PaintStyle.GradientPaint;
import org.apache.poi.sl.usermodel.PaintStyle.SolidPaint;
import org.apache.poi.sl.usermodel.PaintStyle.TexturePaint;
import org.apache.poi.xslf.XSLFTestDataSamples;
import org.junit.jupiter.api.Test;

/**
 * test reading properties from a multi-theme and multi-master document
 *
 * @author Yegor Kozlov
 */
class TestXSLFTheme {
    @Test
    void testRead(){
        XMLSlideShow ppt = XSLFTestDataSamples.openSampleDocument("themes.pptx");
        List<XSLFSlide> slides = ppt.getSlides();

        slide1(slides.get(0));
        slide2(slides.get(1));
        slide3(slides.get(2));
        slide4(slides.get(3));
        slide5(slides.get(4));
        slide6(slides.get(5));
        slide7(slides.get(6));
        slide8(slides.get(7));
        slide9(slides.get(8));
        slide10(slides.get(9));
    }

    private XSLFShape getShape(XSLFSheet sheet, String name){
        for(XSLFShape sh : sheet.getShapes()){
            if(sh.getShapeName().equals(name)) {
                return sh;
            }
        }
        throw new IllegalArgumentException("Shape not found: " + name);
    }

    void slide1(XSLFSlide slide){
        assertEquals(Color.WHITE, slide.getBackground().getFillColor());

        XSLFTheme theme = slide.getTheme();
        assertEquals("Office Theme", theme.getName());

        XSLFTextShape sh1 = (XSLFTextShape)getShape(slide, "Rectangle 3");
        XSLFTextRun run1 = sh1.getTextParagraphs().get(0).getTextRuns().get(0);
        assertEquals(Color.white, getColor(run1.getFontColor()));
        assertEquals(new Color(79, 129, 189), sh1.getFillColor());
        assertTrue(sh1.getFillStyle().getPaint() instanceof SolidPaint) ;   // solid fill

    }

    void slide2(XSLFSlide slide){
        // Background 2, darker 10%
        // YK: PPT shows slightly different color: new Color(221, 217, 195)
        assertEquals(new Color(221, 217, 195), slide.getBackground().getFillColor());
    }

    void slide3(XSLFSlide slide){
        PaintStyle fs = slide.getBackground().getFillStyle().getPaint();
        assertTrue(fs instanceof GradientPaint);
    }

    void slide4(XSLFSlide slide){
        PaintStyle fs = slide.getBackground().getFillStyle().getPaint();
        assertTrue(fs instanceof GradientPaint);

        XSLFTextShape sh1 = (XSLFTextShape)getShape(slide, "Rectangle 4");
        XSLFTextRun run1 = sh1.getTextParagraphs().get(0).getTextRuns().get(0);
        assertEquals(Color.white, getColor(run1.getFontColor()));
        assertEquals(new Color(148, 198, 0), sh1.getFillColor());
        assertTrue(sh1.getFillStyle().getPaint() instanceof SolidPaint) ;   // solid fill

        XSLFTextShape sh2 = (XSLFTextShape)getShape(slide, "Title 3");
        XSLFTextRun run2 = sh2.getTextParagraphs().get(0).getTextRuns().get(0);
        assertEquals(new Color(148, 198, 0), getColor(run2.getFontColor()));
        assertNull(sh2.getFillColor());  // no fill

        assertTrue(slide.getSlideLayout().getFollowMasterGraphics());
    }

    void slide5(XSLFSlide slide){
        PaintStyle fs = slide.getBackground().getFillStyle().getPaint();
        assertTrue(fs instanceof TexturePaint);

        XSLFTextShape sh2 = (XSLFTextShape)getShape(slide, "Title 1");
        XSLFTextRun run2 = sh2.getTextParagraphs().get(0).getTextRuns().get(0);
        assertEquals(new Color(148, 198, 0), getColor(run2.getFontColor()));
        assertNull(sh2.getFillColor());  // no fill
        // font size is 40pt and scale factor is 90%
        assertEquals(36.0, run2.getFontSize(), 0);

        assertTrue(slide.getSlideLayout().getFollowMasterGraphics());
    }

    void slide6(XSLFSlide slide){

        XSLFTextShape sh1 = (XSLFTextShape)getShape(slide, "Subtitle 3");
        XSLFTextRun run1 = sh1.getTextParagraphs().get(0).getTextRuns().get(0);
        assertEquals(new Color(66, 66, 66), getColor(run1.getFontColor()));
        assertNull(sh1.getFillColor());  // no fill

        XSLFTextShape sh2 = (XSLFTextShape)getShape(slide, "Title 2");
        XSLFTextRun run2 = sh2.getTextParagraphs().get(0).getTextRuns().get(0);
        assertEquals(new Color(148, 198, 0), getColor(run2.getFontColor()));
        assertNull(sh2.getFillColor());  // no fill

        assertFalse(slide.getSlideLayout().getFollowMasterGraphics());
    }

    void slide7(XSLFSlide slide){

        //YK: PPT reports a slightly different color: r=189,g=239,b=87
        assertEquals(new Color(189, 239, 87), slide.getBackground().getFillColor());

        assertFalse(slide.getFollowMasterGraphics());
    }

    void slide8(XSLFSlide slide){
        PaintStyle fs = slide.getBackground().getFillStyle().getPaint();
        assertTrue(fs instanceof TexturePaint);
    }

    void slide9(XSLFSlide slide){
        PaintStyle fs = slide.getBackground().getFillStyle().getPaint();
        assertTrue(fs instanceof TexturePaint);
    }

    void slide10(XSLFSlide slide){
        PaintStyle fs = slide.getBackground().getFillStyle().getPaint();
        assertTrue(fs instanceof GradientPaint);

        XSLFTextShape sh1 = (XSLFTextShape)getShape(slide, "Title 3");
        XSLFTextRun run1 = sh1.getTextParagraphs().get(0).getTextRuns().get(0);
        assertEquals(Color.white, getColor(run1.getFontColor()));
        assertNull(sh1.getFillColor());  // no fill

        XSLFTextShape sh2 = (XSLFTextShape)getShape(slide, "Subtitle 4");
        XSLFTextRun run2 = sh2.getTextParagraphs().get(0).getTextRuns().get(0);
        assertEquals(Color.white, getColor(run2.getFontColor()));
        assertNull(sh2.getFillColor());  // no fill
    }
}