Merge branch 'DM-326' into 'master'

DM-326: extend removeInvisibleElements

Closes DM-326

See merge request redactmanager/commons/pdftron-logic-commons!5

src/main/java/com/iqser/red/pdftronlogic/commons/ElementFeatures.java

@@ -3,6 +3,7 @@ package com.iqser.red.pdftronlogic.commons;
 import static com.iqser.red.pdftronlogic.commons.InvisibleElementRemovalService.TOLERANCE;
 
 import java.awt.Color;
+import java.awt.geom.Area;
 import java.awt.geom.GeneralPath;
 import java.awt.geom.Rectangle2D;
 
@@ -77,12 +78,6 @@ public class ElementFeatures {
     }
 
 
-    public boolean isBackground(Rect area) {
-
-        return false;
-    }
-
-
     @SneakyThrows
     private boolean rectsAlmostMatch(Rect bBox) {
         // To address the inconsistencies in the calculation of the bounding box we check equality with a tolerance
@@ -94,12 +89,6 @@ public class ElementFeatures {
     }
 
 
-    public boolean matchesFillColor(Color color) {
-
-        return false;
-    }
-
-
     @EqualsAndHashCode(callSuper = true)
     @Getter
     @SuperBuilder
@@ -126,7 +115,7 @@ public class ElementFeatures {
     @Getter
     @SuperBuilder
     @FieldDefaults(makeFinal = true, level = AccessLevel.PRIVATE)
-    private static class Path extends ElementFeatures {
+    public static class Path extends ElementFeatures {
 
         boolean isClippingPath;
         boolean isClipWindingFill;
@@ -151,7 +140,6 @@ public class ElementFeatures {
         }
 
 
-        @Override
         public boolean matchesFillColor(Color color) {
 
             return color.equals(fillColor);
@@ -162,8 +150,7 @@ public class ElementFeatures {
         public boolean isBackground(Rect area) {
 
             return isFilled && //
-                    getBoundingBox().intersects(area.getX1(), area.getY1(), area.getWidth(), area.getHeight()) && //
-                    linePath.contains(area.getX1(), area.getY1(), area.getWidth(), area.getHeight());
+                    getBoundingBox().intersects(area.getX1(), area.getY1(), area.getWidth(), area.getHeight());
         }
 
     }

src/main/java/com/iqser/red/pdftronlogic/commons/InvisibleElementRemovalService.java

@@ -2,14 +2,18 @@ package com.iqser.red.pdftronlogic.commons;
 
 import java.awt.Color;
 import java.awt.Shape;
+import java.awt.geom.Area;
 import java.awt.geom.GeneralPath;
 import java.awt.geom.Rectangle2D;
 import java.io.InputStream;
 import java.io.OutputStream;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Map;
 import java.util.Set;
 import java.util.TreeSet;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.stream.Collectors;
 
 import com.pdftron.common.PDFNetException;
 import com.pdftron.pdf.ColorPt;
@@ -34,7 +38,7 @@ import lombok.extern.slf4j.Slf4j;
 @Slf4j
 public class InvisibleElementRemovalService {
 
-    static public final double TOLERANCE = 1e-3;
+    static public final double TOLERANCE = 1;
 
 
     /**
@@ -403,19 +407,47 @@ public class InvisibleElementRemovalService {
     }
 
 
+    @SneakyThrows
     private boolean differentColorThanBackgroundColor(Color fillColor, Rect textBBox, InvisibleElementRemovalContext context) {
 
-        List<ElementFeatures> backgroundElements = context.visibleElements().stream().filter(element -> element.isBackground(textBBox)).toList();
+        List<ElementFeatures.Path> backgroundElements = findVisiblePathElementsThatIntersect(textBBox, context);
+
         if (backgroundElements.isEmpty()) {
             return !fillColor.equals(Color.WHITE);
         }
-        return backgroundElements.stream().anyMatch(element -> !element.matchesFillColor(fillColor));
+
+        List<ElementFeatures.Path> pathElementsByColor = backgroundElements.stream().filter(path -> path.getFillColor().equals(fillColor)).toList();
+        if (pathElementsByColor.isEmpty()) {
+            return true;
+        }
+        Area backgroundArea = mergeLinePathsToArea(pathElementsByColor);
+        return !almostContains(backgroundArea, Converter.toRectangle2D(textBBox));
+
+    }
+
+
+    private static List<ElementFeatures.Path> findVisiblePathElementsThatIntersect(Rect textBBox, InvisibleElementRemovalContext context) {
+
+        return context.visibleElements()
+                .stream()
+                .filter(elementFeatures -> elementFeatures.getElementType() == Element.e_path)
+                .map(elementFeatures -> (ElementFeatures.Path) elementFeatures)
+                .filter(element -> element.isBackground(textBBox))
+                .toList();
+    }
+
+
+    private static Area mergeLinePathsToArea(List<ElementFeatures.Path> pathElementsWithSameColor) {
+
+        Area backgroundArea = new Area();
+        pathElementsWithSameColor.stream().map(ElementFeatures.Path::getLinePath).map(Area::new).forEach(backgroundArea::add);
+        return backgroundArea;
     }
 
 
     private boolean almostContains(Shape outer, Rectangle2D inner) {
-        //To address inconsistencies in the calculation of the bounding box we slightly shrink the inner rectangle
 
+        //To address inconsistencies in the calculation of the bounding box we slightly shrink the inner rectangle
         double x_with_tolerance = inner.getX() >= 0 ? inner.getX() + TOLERANCE : inner.getX() - TOLERANCE;
         double y_with_tolerance = inner.getY() >= 0 ? inner.getY() + TOLERANCE : inner.getY() - TOLERANCE;
         double height_with_tolerance = inner.getHeight() - (2 * TOLERANCE);
@@ -450,9 +482,6 @@ public class InvisibleElementRemovalService {
     }
 
 
-
-
-
     @Builder
     private record InvisibleElementRemovalContext(
             boolean delta,

src/test/java/com/iqser/red/pdftronlogic/commons/InvisibleElementRemovalServiceTest.java

@@ -0,0 +1,125 @@
+package com.iqser.red.pdftronlogic.commons;
+
+import static com.iqser.red.pdftronlogic.commons.PdfTextExtraction.extractAllTextFromDocument;
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import com.pdftron.pdf.PDFNet;
+
+import lombok.SneakyThrows;
+
+class InvisibleElementRemovalServiceTest {
+
+    InvisibleElementRemovalService invisibleElementRemovalService;
+    private static final String pdftronLicense = "demo:1650351709282:7bd235e003000000004ec28a6743e1163a085e2115de2536ab6e2cfe5a";
+
+
+    @BeforeEach
+    void createService() {
+
+        PDFNet.initialize(pdftronLicense);
+        invisibleElementRemovalService = new InvisibleElementRemovalService();
+    }
+
+    @Test
+    @SneakyThrows
+    void removeInvisibleText() {
+
+        String fileName = "files/InvisibleText.pdf";
+        String resultFileName = OsUtils.createTmpFileName(fileName, "INVISIBLE_REMOVAL");
+        String deltaResultFileName = OsUtils.createTmpFileName(fileName, "INVISIBLE_REMOVAL_DELTA");
+
+        try (var in = this.getClass().getClassLoader().getResourceAsStream(fileName); var out = new FileOutputStream(resultFileName)) {
+            invisibleElementRemovalService.removeInvisibleElements(in, out, false);
+        }
+
+        try (var in = this.getClass().getClassLoader().getResourceAsStream(fileName); var out = new FileOutputStream(deltaResultFileName)) {
+            invisibleElementRemovalService.removeInvisibleElements(in, out, true);
+        }
+        try (var in = new FileInputStream(resultFileName)) {
+            String[] text = extractAllTextFromDocument(in).split("\n");
+            assertThat(text).contains("APPENDIX 16 Pathology Report", "Amendment 1", "Page 255 of 260");
+        }
+        try (var in = new FileInputStream(deltaResultFileName)) {
+            String[] text = extractAllTextFromDocument(in).split("\n");
+            assertThat(text).contains("Michela Gregori DVM PhD Pathologist", "AUTHOR(S):", "COMPLETION DATE:");
+        }
+
+    }
+
+
+    @Test
+    @SneakyThrows
+    void removeInvisibleElementsWithColoredBackground() {
+
+        String fileName = "files/textOnColoredBackground.pdf";
+        String resultFileName = OsUtils.createTmpFileName(fileName, "INVISIBLE_REMOVAL");
+        String deltaResultFileName = OsUtils.createTmpFileName(fileName, "INVISIBLE_REMOVAL_DELTA");
+
+        try (var in = this.getClass().getClassLoader().getResourceAsStream(fileName); var out = new FileOutputStream(resultFileName)) {
+            invisibleElementRemovalService.removeInvisibleElements(in, out, false);
+        }
+
+        try (var in = this.getClass().getClassLoader().getResourceAsStream(fileName); var out = new FileOutputStream(deltaResultFileName)) {
+            invisibleElementRemovalService.removeInvisibleElements(in, out, true);
+        }
+        try (var in = new FileInputStream(deltaResultFileName)) {
+            String result = PdfTextExtraction.extractAllTextFromDocument(in);
+            assertThat(result).contains("#1 Dark",
+                    "#13 Yellow",
+                    "Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip\n" + "ex ea commodo consequat. Duis autem vel eum iriure dolor in hendrerit in vulputate velit esse molestie\n" + "consequat, vel illum dolore eu feugiat nulla facilisis at vero eros et accumsan et iusto odio dignissim\n" + "qui blandit praesent luptatum zzril delenit augue duis dolore te feugait nulla facilisi.");
+            assertThat(result).doesNotContain("Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut\n" + "labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et\n" + "ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem\n" + "ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et\n" + "dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea\n" + "rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum\n" + "dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore\n" + "magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet\n" + "clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. ");
+        }
+
+    }
+
+    @Test
+    @SneakyThrows
+    void removeInvisibleElementsThinFilledTable() {
+
+        String fileName = "files/tableIsSingleLinePath.pdf";
+        String resultFileName = OsUtils.createTmpFileName(fileName, "INVISIBLE_REMOVAL");
+        String deltaResultFileName = OsUtils.createTmpFileName(fileName, "INVISIBLE_REMOVAL_DELTA");
+
+        try (var in = this.getClass().getClassLoader().getResourceAsStream(fileName); var out = new FileOutputStream(resultFileName)) {
+            invisibleElementRemovalService.removeInvisibleElements(in, out, false);
+        }
+
+        try (var in = this.getClass().getClassLoader().getResourceAsStream(fileName); var out = new FileOutputStream(deltaResultFileName)) {
+            invisibleElementRemovalService.removeInvisibleElements(in, out, true);
+        }
+        try (var in = new FileInputStream(deltaResultFileName)) {
+            String result = PdfTextExtraction.extractAllTextFromDocument(in);
+            assertThat(result).isEqualTo("");
+        }
+
+    }
+
+    @Test
+    @SneakyThrows
+    void removeInvisibleElementsChineseOverlapped() {
+
+        String fileName = "files/chineseInvisibleElements.pdf";
+        String resultFileName = OsUtils.createTmpFileName(fileName, "INVISIBLE_REMOVAL");
+        String deltaResultFileName = OsUtils.createTmpFileName(fileName, "INVISIBLE_REMOVAL_DELTA");
+
+        try (var in = this.getClass().getClassLoader().getResourceAsStream(fileName); var out = new FileOutputStream(resultFileName)) {
+            invisibleElementRemovalService.removeInvisibleElements(in, out, false);
+        }
+
+        try (var in = this.getClass().getClassLoader().getResourceAsStream(fileName); var out = new FileOutputStream(deltaResultFileName)) {
+            invisibleElementRemovalService.removeInvisibleElements(in, out, true);
+        }
+        try (var in = new FileInputStream(deltaResultFileName)) {
+            String result = PdfTextExtraction.extractAllTextFromDocument(in);
+            assertThat(result).contains("[Table_KeyInfo]", "[Table_StockInfo]", "[Table_BaseInfo]", "国内无线键鼠龙头企", "业", "精研研发发制制造造商商先先的的本");
+        }
+
+    }
+
+}

src/test/java/com/iqser/red/pdftronlogic/commons/OsUtils.java

@@ -0,0 +1,31 @@
+package com.iqser.red.pdftronlogic.commons;
+
+import java.nio.file.Path;
+import java.util.Locale;
+
+import org.junit.platform.commons.util.StringUtils;
+
+public class OsUtils {
+
+    private static boolean isWindows() {
+
+        return System.getProperty("os.name").toLowerCase(Locale.ROOT).contains("windows");
+    }
+
+
+    public static String getTemporaryDirectory() {
+
+        String tmpdir = System.getProperty("java.io.tmpdir");
+        if (isWindows() && StringUtils.isNotBlank(tmpdir)) {
+            return tmpdir;
+        }
+        return "/tmp";
+    }
+
+
+    public static String createTmpFileName(String filename, String suffix) {
+
+        return Path.of(OsUtils.getTemporaryDirectory()).resolve(Path.of(filename).getFileName()).toString().replace(".pdf", "_" + suffix + ".pdf");
+    }
+
+}