[PDFBOX-5567] Font gets smaller for each rendered page

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.27, 3.0.0 PDFBox
• Fix Version/s: 2.0.28, 3.0.0 PDFBox
• Component/s: Rendering
• Assignee: Tilman Hausherr
• Reporter: Oliver Schmidtmer
• Created: 17/Feb/23 19:10
• Updated: 13/Apr/23 14:54
• Resolved: 18/Feb/23 04:22

Description

Every time the page in the attached document is re-rendered, the font gets smaller.
First rendering:

Second rendering:

Reloading the complete document resets the font size.

This is probably caused in TTFGlyph2D.getPathForGID

The problematic text rendering uses scaling,
so the path gotten in the line

GeneralPath glyph = vectorFont.getPath(code);

is rescaled in

                if (hasScaling)
                {
                    AffineTransform atScale = AffineTransform.getScaleInstance(scale, scale);
                    glyphPath.transform(atScale);
                }

This should probably be done on a cloned path.