[PDFBOX-5784] AppearanceGeneratorHelper assumes fontscale 1000

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.0.32, 3.0.3 PDFBox, 4.0.0
• Component/s: AcroForm
• Labels: Appearance
• External issue URL: https://stackoverflow.com/questions/78141089/potentially-incorrect-calculation-of-the-character-width-when-filling-in-the-acr
• Assignee: Maruan Sahyoun
• Reporter: Tilman Hausherr
• Created: 11/Mar/24 16:34
• Updated: 02/Aug/24 03:44
• Resolved: 05/Apr/24 08:58

Description

The user in the attached SO question noticed that the comb adjustment needed a factor of 2 to work correctly. A look at the font shows UnitsPerEm = 2048.

Sample code:

doc.getDocumentCatalog().getAcroForm().getField("field1").setValue("WWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWWW");
doc.getDocumentCatalog().getAcroForm().getField("field2").setValue("MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM");

Issue Links

• is related to: PDFBOX-5859 StringIndexOutOfBoundsException in AppearanceGeneratorHelper