Bug 22098 - Incorrect rendering of shadings
Summary: Incorrect rendering of shadings
Status: RESOLVED FIXED
Alias: None
Product: poppler
Classification: Unclassified
Component: cairo backend (show other bugs)
Version: unspecified
Hardware: x86 (IA32) Linux (All)
: medium major
Assignee: poppler-bugs
QA Contact:
URL: http://www.acquerra.com.au/poppler/
Whiteboard:
Keywords:
Depends on: 81657
Blocks:
  Show dependency tree / graph
 
Reported: 2009-06-04 16:38 UTC by Anthony Wesley
Modified: 2015-12-04 10:43 UTC (History)
2 users (show)

See Also:
i915 platform:
i915 features:

Attachments
pdftocairo rendering as of 2014-07-22 (195.66 KB, image/png)
2014-07-22 06:20 UTC, Jason Crain 		Details
Scale radial pattern (2.15 KB, patch)
2014-09-02 01:28 UTC, Jason Crain 		Details | Splinter Review
View All

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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