411636 - pngsuite-background reftest fails on Linux with slight color differences.

Status: NEW

(Core :: Graphics: ImageLib, defect)

Description

[Justin Dolske [:Dolske]]

The just-added pngsuite-background reftests fail on Linux. The test looks ok at first glance, but a quick look at one pixel shows it off by 1.

These images are all partial transparency over a solid color background. I suspect it's just a case of the alpha blending having slight platform differences.

For now, I'm marking the test as only passing on OS X. [Windows was already expected to fail, due to bug 405384]

Comment 1

[Glenn Randers-Pehrson]

Are you using the embedded libpng or the system libpng?
Do you have gfx.color_management.enabled enabled?  What happens
if you change the gfx.color_management.enabled setting and restart
your browser?

Note that although the pngsuite-background test series has PNG bKGD
chunks, that is  of no conseqence to mozilla because we always ignore
the bKGD chunk. The files also all have an alpha channel and a
gamma=1.0 chunk.

Comment 2

[Timothy Nikkel (:tnikkel)]

These tests now get unexpected pass for me on Linux.