Add a test when the image is in the figure tag

DEVSIX-6986

Author: Andrei Stryhelski

src/test/java/com/itextpdf/html2pdf/element/FigureTest.java

@@ -23,6 +23,12 @@ This file is part of the iText (R) project.
 package com.itextpdf.html2pdf.element;
 
 import com.itextpdf.html2pdf.HtmlConverter;
+import com.itextpdf.html2pdf.utils.ImageSizeMeasuringListener;
+import com.itextpdf.kernel.pdf.PdfDocument;
+import com.itextpdf.kernel.pdf.PdfName;
+import com.itextpdf.kernel.pdf.PdfReader;
+import com.itextpdf.kernel.pdf.canvas.parser.PdfCanvasProcessor;
+import com.itextpdf.kernel.pdf.xobject.PdfImageXObject;
 import com.itextpdf.kernel.utils.CompareTool;
 import com.itextpdf.test.ExtendedITextTest;
 import com.itextpdf.test.annotations.type.IntegrationTest;
@@ -61,4 +67,23 @@ public void figureInSpanTest() throws IOException, InterruptedException {
         HtmlConverter.convertToPdf(new File(sourceFolder + "figureInSpan.html"), new File(destinationFolder + "figureInSpan.pdf"));
         Assert.assertNull(new CompareTool().compareByContent(destinationFolder + "figureInSpan.pdf", sourceFolder + "cmp_figureInSpan.pdf", destinationFolder, "diff04_"));
     }
+
+    @Test
+    //TODO DEVSIX-6985: change 1 to 2 in "PdfImageXObject image = doc.getPage(1).getResources()", change the assert
+    //  from "Assert.assertTrue(isImageCropped)" to assertFalse
+    public void checkImageRemainsUncutWithFigureTagTest() throws IOException {
+        File pdfFile = new File(destinationFolder + "imageInFigure.pdf");
+        HtmlConverter.convertToPdf(new File(sourceFolder + "imageInFigure.html"),
+                pdfFile);
+        try (PdfDocument doc = new PdfDocument(new PdfReader(pdfFile))) {
+            PdfImageXObject image = doc.getPage(1).getResources()
+                    .getImage(new PdfName("Im1"));
+            Assert.assertNotNull(image);
+            ImageSizeMeasuringListener listener = new ImageSizeMeasuringListener(1);
+            PdfCanvasProcessor processor = new PdfCanvasProcessor(listener);
+            processor.processPageContent(doc.getPage(1));
+            boolean isImageCropped = listener.bbox.getY() < 0;
+            Assert.assertTrue(isImageCropped);
+        }
+    }
 }

src/test/java/com/itextpdf/html2pdf/utils/ImageSizeMeasuringListener.java

@@ -0,0 +1,98 @@
+package com.itextpdf.html2pdf.utils;
+
+import com.itextpdf.kernel.geom.AffineTransform;
+import com.itextpdf.kernel.geom.Matrix;
+import com.itextpdf.kernel.geom.NoninvertibleTransformException;
+import com.itextpdf.kernel.geom.Point;
+import com.itextpdf.kernel.geom.Rectangle;
+import com.itextpdf.kernel.pdf.canvas.parser.EventType;
+import com.itextpdf.kernel.pdf.canvas.parser.data.IEventData;
+import com.itextpdf.kernel.pdf.canvas.parser.data.ImageRenderInfo;
+import com.itextpdf.kernel.pdf.canvas.parser.listener.IEventListener;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
+
+public class ImageSizeMeasuringListener implements IEventListener {
+
+    Rectangle cropbox;
+    public Rectangle bbox;
+    int page;
+
+    public ImageSizeMeasuringListener(int page) {
+
+        if (cropbox == null) {
+            cropbox = new Rectangle(Float.MIN_VALUE, Float.MIN_VALUE, Float.MAX_VALUE, Float.MAX_VALUE);
+        }
+        this.page = page;
+    }
+
+    public void eventOccurred(IEventData data, EventType type) {
+        switch (type) {
+            case RENDER_IMAGE:
+                ImageRenderInfo renderInfo = (ImageRenderInfo) data;
+                final Matrix imageCtm = renderInfo.getImageCtm();
+                bbox = calcImageRect(imageCtm);
+            default:
+                break;
+        }
+    }
+
+    public Set<EventType> getSupportedEvents() {
+        return null;
+    }
+
+    private double getWidth(Matrix m) {
+        return Math.sqrt(Math.pow(m.get(Matrix.I11), 2) + Math.pow(m.get(Matrix.I21), 2));
+    }
+
+    private double getHeight(Matrix m) {
+        return Math.sqrt(Math.pow(m.get(Matrix.I12), 2) + Math.pow(m.get(Matrix.I22), 2));
+    }
+
+    private Rectangle calcImageRect(Matrix ctm) {
+        if (ctm == null) {
+            return null;
+        }
+
+        Point[] points = transformPoints(ctm, false,
+                new Point(0, 0), new Point(0, 1),
+                new Point(1, 0), new Point(1, 1));
+
+        return getAsRectangle(points[0], points[1], points[2], points[3]);
+    }
+
+    private Rectangle getAsRectangle(Point p1, Point p2, Point p3, Point p4) {
+        List<Double> xs = Arrays.asList(p1.getX(), p2.getX(), p3.getX(), p4.getX());
+        List<Double> ys = Arrays.asList(p1.getY(), p2.getY(), p3.getY(), p4.getY());
+
+        double left = Collections.min(xs);
+        double bottom = Collections.min(ys);
+        double right = Collections.max(xs);
+        double top = Collections.max(ys);
+
+        return new Rectangle((float) left, (float) bottom, (float) right, (float) top);
+    }
+
+    private Point[] transformPoints(Matrix transformationMatrix, boolean inverse, Point... points) {
+        AffineTransform t = new AffineTransform(transformationMatrix.get(Matrix.I11),
+                transformationMatrix.get(Matrix.I12),
+                transformationMatrix.get(Matrix.I21), transformationMatrix.get(Matrix.I22),
+                transformationMatrix.get(Matrix.I31), transformationMatrix.get(Matrix.I32));
+        Point[] transformed = new Point[points.length];
+
+        if (inverse) {
+            try {
+                t = t.createInverse();
+            } catch (NoninvertibleTransformException e) {
+                throw new RuntimeException("Exception during effective image rectangle calculation", e);
+            }
+        }
+
+        t.transform(points, 0, transformed, 0, points.length);
+
+        return transformed;
+    }
+}

src/test/resources/com/itextpdf/html2pdf/element/FigureTest/imageInFigure.html

@@ -0,0 +1,13 @@
+<html>
+<head>
+</head>
+<body>
+<p>In this test, the picture in figure is checked. The picture should not be cropped</p>
+<div style="margin-top: 900;"></div>
+<figure>
+    <img src="imageInFigure.jpg" style="height:300.0pt;width:468pt" />
+</figure>
+</body>
+</html>
+
+