Bug 14578

Summary:	Poppler should paint images with CAIRO_EXTEND_PAD
Product:	poppler	Reporter:	Carl Worth <cworth>
Component:	cairo backend	Assignee:	poppler-bugs <poppler-bugs>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	medium
Version:	unspecified
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:
Bug Depends on:
Bug Blocks:	12143
Attachments:	PDF file to demonstrate the bug Current, undesired output from poppler (yes, cairo's fault!) Desired rendering

Description Carl Worth 2008-02-20 03:30:37 UTC

Now, I feel somewhat bad posting this bug, because I know poppler would
have liked to have done better in this regard a long time ago, and it's
only been cairo that's holding it back. But, now, finally, with the
upcoming cairo 1.6 release, there will finally be a CAIRO_EXTEND_PAD
so that scaled images can be drawn without blurred edges.

There's not any way for the PDF file to hint what kind of filtering is
desired is there? If so, then cairo would love to hint exactly what's
desired.

-Carl

Comment 1 Carl Worth 2008-02-20 03:31:37 UTC

Created attachment 14439 [details]
PDF file to demonstrate the bug

Comment 2 Carl Worth 2008-02-20 03:32:15 UTC

Created attachment 14440 [details]
Current, undesired output from poppler (yes, cairo's fault!)

Comment 3 Carl Worth 2008-02-20 03:32:42 UTC

Created attachment 14441 [details]
Desired rendering

Comment 4 Carlos Garcia Campos 2009-06-03 05:28:44 UTC

This bug seems to be fixed after applying patch attached to bug #9860

Comment 5 Carlos Garcia Campos 2009-07-19 08:50:24 UTC

(In reply to comment #0)
> There's not any way for the PDF file to hint what kind of filtering is
> desired is there? If so, then cairo would love to hint exactly what's
> desired.

Yes, the 'Interpolate' field in the Image dictionary, now CAIRO_FILTER_FAST is used when Interpolate flag is not present, and CAIRO_FILTER_BEST otherwise. In addition, CAIRO_EXTEND_PAD is used in drawImage() method now, we still have to fix the other image methods, though.

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