[Libreoffice-bugs] [Bug 125329] Automatic font color becomes invisible in Calc charts with dark background

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=125329

--- Comment #6 from Luke Deller <luke at deller.id.au> ---
Thanks Timur.

This commit 77e21bb36a2cdaaa0f4049dee0d45c5b2325c6e9 simply changes the
threshold at which a colour is considered "dark".

When I revert the change in commit 77e21bb36a2cdaaa0f4049dee0d45c5b2325c6e9
upon latest git master, I can still reproduce the problem using a document
background of "Dark Grey 3" (red=28,green=28,blue=28).

I suspect your bibisection was using a slightly lighter colour?  Would it be
possible to repeat bibisection with a darker colour?

In terms of debugging the underlying problem, I notice that the decision to use
a white font comes from editeng/source/editeng/impedit3.cxx
ImpEditEngine::GetAutoColor()
(because if I change that to return COL_LIGHTRED instead of COL_WHITE then try
to reproduce this bug, the font color in the chart axis label becomes light red
when I resize the chart).
This wrong decision appears to be because it is referring to background colour
of the ImpEditEngine instance which is different from the background colour of
the chart.

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