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

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Details

Type: Bug
Status: Open
Priority: Major
Resolution: Unresolved
Affects Version/s: 2.0.24
Fix Version/s: None
Component/s: Rendering
Labels:
None

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.