Bug 22098

Summary:	Incorrect rendering of shadings
Product:	poppler	Reporter:	Anthony Wesley <awesley>
Component:	cairo backend	Assignee:	poppler-bugs <poppler-bugs>
Status:	RESOLVED FIXED	QA Contact:
Severity:	major
Priority:	medium	CC:	awesley, jason
Version:	unspecified
Hardware:	x86 (IA32)
OS:	Linux (All)
URL:	http://www.acquerra.com.au/poppler/
Whiteboard:
i915 platform:		i915 features:
Bug Depends on:	81657
Bug Blocks:
Attachments:	pdftocairo rendering as of 2014-07-22 Scale radial pattern

Description Anthony Wesley 2009-06-04 16:38:47 UTC

Poppler 0.10.7 (May 16 2009) incorrectly renders a sample PDF.

Here is the PDF and the image as rendered by poppler:
http://www.acquerra.com.au/poppler/

I thought this might have been an axial shading bug, but that is listed as fixed in this release?

regards, Anthony

Comment 1 Albert Astals Cid 2009-06-06 02:53:23 UTC

We fixed a problem in axial shadings yes, are all shadings 100% perfect, no.

Comment 2 Carlos Garcia Campos 2009-11-18 09:49:05 UTC

It seems to work with splash, not with cairo.

Comment 3 Jason Crain 2014-07-22 06:20:44 UTC

Created attachment 103255 [details]
pdftocairo rendering as of 2014-07-22

The current pdftocairo rendering is much improved compared to the linked image.  There is still a problem where part of the ducks' bills are missing.  Attached is an image of the current rendering.

As I investigate it, the cause is looking really similar to bug #33364, where cairo does not like the pattern's matrix.

Comment 4 Jason Crain 2014-07-23 05:51:34 UTC

Submitted cairo bug #81657 - Does not draw with radial pattern if scaling is too small

Comment 5 Jason Crain 2014-09-02 01:28:12 UTC

Created attachment 105580 [details] [review]
Scale radial pattern

This patch is a workaround for the limitation in cairo.  It scales the pattern and sets a transformation matrix to avoid overflowing pixman's calculations.

Comment 6 Carlos Garcia Campos 2015-12-04 10:43:23 UTC

Pushed, sorry for the delay reviewing this. Thanks!

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