[PDFBOX-5296] Rendering error for file with softmask outside bounds

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.0.24
• Component/s: Rendering
• Assignee: Unassigned
• Reporter: Tilman Hausherr
• Created: 19/Oct/21 17:44
• Updated: 19/Oct/21 17:48

Description

Follow-up of PDFBOX-3000. The attached file doesn't render correctly. I don't know if we ever get this fixed, but here's what I know.

In both cases the softmask is outside of the page bounds. The two softmasks are here (the second one is relevant for the bad square):

Root/Pages/Kids/[0]/Resources/XObject/Fm21/Resources/ExtGState/GS0/SMask
Root/Pages/Kids/[0]/Resources/ExtGState/GS29/SMask

returning Color(0, 0, 0, 0) (full transparency) in PageDrawer.applySoftMaskToPaint() instead of the parentPaint (which is a TexturePaint) brings a correct rendering. However this would break almost all other renderings with a softmask outside of bounds, e.g. PDFJS-7992.pdf, PDFBOX-2103.pdf, 007087-payment-due-p58.pdf and many more - ask if you're working on this. The softmask is in CMYK and there is a backdrop.

Issue Links

• relates to: PDFBOX-3000 Transparency Group issues