311193 - Incorrect SVG rendering for outlines since change from GDI+ to Cairo on branch.

Status: RESOLVED INVALID

(Core :: SVG, defect)

Description

[Fede]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b5) Gecko/20051004 Firefox/1.4.1
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8b5) Gecko/20051004 Firefox/1.4.1

In the example given, previous to the change from GDI+ rendering backend for SVG
to Cairo, the tiger showed black outlines around the eyelashes and the
moustache. Now it only renders the white fill, without the stroke that makes the
outline. It seems to be related to the size of the outline, as increasing it
makes the outline appear again.

Reproducible: Always

Steps to Reproduce:
1.Start a Firefox nightly with version equal to 2005100415 or later (haven't
tried narrowing the window with hourlies).
2.Open http://www.croczilla.com/svg/samples/tiger/tiger.svg
3.Compare it to the rendering produced on previous nightlies.

Actual Results:  
The eyelashes and moustache are missing the black outline they are supposed to have.

Expected Results:  
The eyelashes and moustache should be showing black outlines.

Confirmed on mozillazine forums by at least 2 users.

Comment 1

[Peter van der Woude [:Peter6]]

Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.8b5) Gecko/20051005
Firefox/1.4.1 ID:2005100500

Confirmed

Comment 2

[Jonathan Watt [:jwatt]]

Hi Fede. Thanks for your testing and bug report, but it is actually GDI+ that
does it wrong, and cairo that does it right. Those lines are very, very thin.
GDI+ incorrectly rounds up strokes of less than 1px to 1px, whereas cairo draws
them as they should be. --> invalid