Bug 7014

Summary:	Scaled dashes are rendered incorrectly
Product:	poppler	Reporter:	Carl Worth <cworth>
Component:	cairo backend	Assignee:	Jeff Muizelaar <jmuizelaar>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	high
Version:	unspecified
Hardware:	x86 (IA32)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:
Attachments:	Test case showing the bug screenshot of Preview's rendering of the attached pdf

Description Carl Worth 2006-05-24 06:39:55 UTC

When stroking a dashed line with a non-identity transformation, the dashing is
not handled appropriately.

I'll attach a PDF file which renders properly in acroread, but incorrectly in
evince/poppler/cairo. There, at the 100% scale the first (unscaled) row is
correct, while the others are not, (they should be simply vertically-scaled
versions of the first row, but the dash positions change).

Similary, if the zoom setting is changed from 100% then the first row also
becomes incorrect.

Comment 1 Carl Worth 2006-05-24 06:40:31 UTC

Created attachment 5724 [details]
Test case showing the bug

Comment 2 Carl Worth 2006-05-24 07:49:23 UTC

Oh, I just realized I wasn't running a pristine poppler.

Instead, I was using poppler with the patch from bug #6948 here:

https://bugs.freedesktop.org/attachment.cgi?id=5651

So it may be that the bug only appears due to that patch.

-Carl

Comment 3 Carl Worth 2006-05-24 07:53:26 UTC

(In reply to comment #2)
> 
> So it may be that the bug only appears due to that patch.
> 

Nope. The fundamental bug is still present.

After I reverted that patch, so I have a clean, from-cvs poppler tree, the
rendering of the first row in the test case is still different from the
rendering of the second and third rows.

However, reverting the patch does fix the problem with the dashing changing as I
zoom in and out with evince.

-Carl

Comment 4 Jeff Muizelaar 2006-05-28 09:00:51 UTC

This problem should be fixed with the new patch from bug #6948. An interesting aside, Preview (the OSX 
PDF reader) doesn't render the attached pdf correctly either. See the attachment.

Comment 5 Jeff Muizelaar 2006-05-28 09:01:51 UTC

Created attachment 5752 [details]
screenshot of Preview's rendering of the attached pdf

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