OO-5067: try to adapt text to available characters in the PDF fonts

src/main/java/org/olat/core/util/pdf/PdfDocument.java

@@ -21,6 +21,7 @@ package org.olat.core.util.pdf;
 
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
+import java.text.Normalizer;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Calendar;
@@ -124,7 +125,7 @@ public class PdfDocument {
         currentContentStream.beginText();
         currentContentStream.setFont(font, fontSize);
         currentContentStream.newLineAtOffset(marginLeftRight, currentY);
-        currentContentStream.showText(text);
+		showTextToStream(text, currentContentStream);
         currentContentStream.endText();
         
         float leading = lineHeightFactory * fontSize;
@@ -177,7 +178,7 @@ public class PdfDocument {
         currentContentStream.setFont(textFont, fontSize);
         currentContentStream.newLineAtOffset(marginLeftRight, currentY);            
         for (String line: lines) {
-        	currentContentStream.showText(line);
+			showTextToStream(line, currentContentStream);
             currentContentStream.newLineAtOffset(0, -leading);
             currentY -= leading; 
         }
@@ -224,6 +225,16 @@ public class PdfDocument {
     			.replace('\u2212', '-');
     }
     
+    public static void showTextToStream(String text, PDPageContentStream stream) throws IOException {
+    	String cleanedText = cleanString(text);
+    	try {
+			stream.showText(cleanedText);
+		} catch (IllegalArgumentException e) {
+			stream.showText(Normalizer.normalize(cleanedText, Normalizer.Form.NFKD)
+					.replaceAll("\\p{InCombiningDiacriticalMarks}+",""));
+		}
+    }
+    
     public void drawLine(float xStart, float yStart, float xEnd, float yEnd, float lineWidth) 
     throws IOException {
 		currentContentStream.setLineWidth(lineWidth);
@@ -239,7 +250,7 @@ public class PdfDocument {
 		currentContentStream.beginText();
 		currentContentStream.setFont(font, fontSize);
 		currentContentStream.newLineAtOffset(textx, texty);
-		currentContentStream.showText(text);
+		showTextToStream(text, currentContentStream);
 		currentContentStream.endText();
     }
     

src/main/java/org/olat/course/nodes/cl/ui/CheckboxPDFExport.java

@@ -354,7 +354,7 @@ public class CheckboxPDFExport extends PdfDocument implements MediaResource {
 				currentContentStream.setTextMatrix(Matrix.getRotateInstance(3 * (Math.PI / 2), textx + cellMargin, texty - cellMargin));
 				textx += colWidth;
 			}
-			currentContentStream.showText(cleanString(text));
+			showTextToStream(text, currentContentStream);
 			currentContentStream.endText();
 		}
 
@@ -381,7 +381,7 @@ public class CheckboxPDFExport extends PdfDocument implements MediaResource {
 							currentContentStream.beginText();
 							currentContentStream.setFont(font, fontSize);
 							currentContentStream.newLineAtOffset(textx, lineTexty);
-							currentContentStream.showText(textLine);
+							showTextToStream(textLine, currentContentStream);
 							currentContentStream.endText();
 							lineTexty -= (lineHeightFactory * fontSize);
 						}
@@ -389,7 +389,7 @@ public class CheckboxPDFExport extends PdfDocument implements MediaResource {
 						currentContentStream.beginText();
 						currentContentStream.setFont(font, fontSize);
 						currentContentStream.newLineAtOffset(textx, texty);
-						currentContentStream.showText(text);
+						showTextToStream(text, currentContentStream);
 						currentContentStream.endText();
 					}
 				}

src/main/java/org/olat/course/nodes/cl/ui/CheckedPDFExport.java

@@ -315,7 +315,7 @@ public class CheckedPDFExport extends PdfDocument implements MediaResource {
 			currentContentStream.beginText();
 			currentContentStream.setFont(font, fontSize);
 			currentContentStream.newLineAtOffset(textx, texty - headerHeight + cellMargin);
-			currentContentStream.showText(cleanString(text));
+			showTextToStream(text, currentContentStream);
 			currentContentStream.endText();
 			textx += colWidth;
 		}

src/main/java/org/olat/modules/lecture/ui/export/LecturesBlockPDFExport.java

@@ -511,13 +511,13 @@ public class LecturesBlockPDFExport extends PdfDocument implements MediaResource
 						currentContentStream.beginText();
 						currentContentStream.setFont(font, fontSize - 2);
 						currentContentStream.newLineAtOffset(boxx + 2f, texty);
-						currentContentStream.showText(comment);
+						showTextToStream(comment, currentContentStream);
 						currentContentStream.endText();
 					} else {
 						currentContentStream.beginText();
 						currentContentStream.setFont(font, fontSize);
 						currentContentStream.newLineAtOffset(boxx + 2f, texty);
-						currentContentStream.showText(comment);
+						showTextToStream(comment, currentContentStream);
 						currentContentStream.endText();
 					}
 				}

src/main/java/org/olat/modules/lecture/ui/export/LecturesBlockSignaturePDFExport.java

@@ -288,7 +288,7 @@ public class LecturesBlockSignaturePDFExport extends PdfDocument implements Medi
 					currentContentStream.beginText();
 					currentContentStream.setFont(font, fontSize);
 					currentContentStream.newLineAtOffset(textx, lineTexty);
-					currentContentStream.showText(textLine);
+					showTextToStream(textLine, currentContentStream);
 					currentContentStream.endText();
 					lineTexty -= (lineHeightFactory * fontSize);
 				}
@@ -296,7 +296,7 @@ public class LecturesBlockSignaturePDFExport extends PdfDocument implements Medi
 				currentContentStream.beginText();
 				currentContentStream.setFont(font, fontSize);
 				currentContentStream.newLineAtOffset(textx, texty);
-				currentContentStream.showText(text);
+				showTextToStream(text, currentContentStream);
 				currentContentStream.endText();
 			}
 			texty -= rowHeights[i];