[PDFBOX-5784] AppearanceGeneratorHelper assumes fontscale 1000 - ASF JIRA

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Details

Type: Bug
Status: Closed
Priority: Major
Resolution: Fixed
Affects Version/s: None
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

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");