Bug 95268

Summary:	pdftoppm: X and Y scaling are swapped
Product:	poppler	Reporter:	Jason Crain <jason>
Component:	utils	Assignee:	poppler-bugs <poppler-bugs>
Status:	RESOLVED MOVED	QA Contact:
Severity:	normal
Priority:	medium
Version:	unspecified
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:
Attachments:	[patch] Calculate rotation before scaling

Description Jason Crain 2016-05-04 20:27:01 UTC

A similar bug for pdftocairo was fixed in bug #94655.  The ZIP archive in that bug (https://bugs.freedesktop.org/attachment.cgi?id=122468) has two files, good.pdf and bad.pdf.

Running the following command:

  pdftoppm -png -singlefile -f 1 -scale-to-x 1275 -scale-to-y 1650 bad.pdf bad

creates a 1651 x 1275 png image.  With those -scale-to-x/y arguments, it should be 1275 x 1651.  The x and y scaling gets swapped because the PDF is internally rotated.  The page dictionary specifies /Rotate 270.

Comment 1 Jason Crain 2016-05-04 20:31:23 UTC

Created attachment 123469 [details] [review]
[patch] Calculate rotation before scaling

This patch fixes this by moving the rotation check to before the scaling calculation.

Comment 2 GitLab Migration User 2018-08-21 11:16:15 UTC

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