Bug 44731

Summary:	PDF import problems with gradients and patterns
Product:	LibreOffice	Reporter:	mathog <mathog>
Component:	Drawing	Assignee:	Not Assigned <libreoffice-bugs>
Status:	NEW ---	QA Contact:
Severity:	normal
Priority:	medium	CC:	iamtester8, mathog, vvort
Version:	3.4.4 release
Hardware:	x86 (IA32)
OS:	All
Whiteboard:	Confirmed:4.2.0.2:OSX
i915 platform:		i915 features:
Bug Depends on:	86211
Bug Blocks:
Attachments:	Problem PDF source SVG for the problem PDF Screen shot of LODraw after opening the problem PDF New gradient test (PDF) New gradient test (SVG) Clipping patch (experimental)

Description mathog 2012-01-12 09:34:18 UTC

Created attachment 55501 [details]
Problem PDF

Example PDF made by save as from Inkscape.  Looks fine in PDF viewers.  In LODraw
the gradient/pattern extends to the limits of the image.  3.5.0b2 does exactly the same thing.

This is a specific issue extracted from bug 43806

Comment 1 mathog 2012-01-12 09:34:53 UTC

Created attachment 55502 [details]
source SVG for the problem PDF

Comment 2 mathog 2012-01-12 09:35:39 UTC

Created attachment 55503 [details]
Screen shot of LODraw after opening the problem PDF

Comment 3 mathog 2012-01-20 11:01:32 UTC

Problem is unchanged in 3.5.0rc1 on Windows

Comment 4 tester8 2012-01-20 14:04:01 UTC

Reproduced with

LOdev 3.5.0beta3
e40af8c-10029e3-615e522-88673a2-727f724
Ubuntu 10.04.3 x86
Linux 2.6.32-37-generic Russian UI

Comment 5 foss 2014-01-21 10:36:28 UTC

Confirmed:4.2.0.2:OSX

OS > All

Comment 6 vvort 2014-04-26 14:52:03 UTC

Created attachment 98038 [details]
New gradient test (PDF)

Two types of bugs are mixed in provided test PDF (gradient.pdf): clipping and opacity.
Here is the new test files: gradient_test4.svg and gradient_test4.pdf
They are free from opacity bugs (and from big black rectangles as well).

Comment 7 vvort 2014-04-26 14:52:43 UTC

Created attachment 98039 [details]
New gradient test (SVG)

Comment 8 vvort 2014-04-26 15:05:58 UTC

Created attachment 98040 [details] [review]
Clipping patch (experimental)

Clipping must be performed without modifying of source objects.
But there is no such feature in LibreOffice Draw.
I have tried to implement modifying clipping.
But I was faced with two problems:
1. Radial gradients rendered by poppler as 256 polygons with 400 points.
That is bad for performance, but when clip is applied, situation becomes even worse.
2. Function basegfx::tools::clipPolyPolygonOnPolyPolygon() behaves badly in border cases. With my test file it fails 2 times: with radial gradient clipping and with pattern fill clipping.
Here is my experimental patch file.
Maybe it will be useful for someone.

Comment 9 vvort 2014-11-12 16:17:44 UTC

Bug 86211 contains newer version of clipping patch

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