Minimap displays colors incorrectly (SDL renderer)

Could you try to disable opengl in the advanced options?

My theory is that your graphics card does not have the ability that Widelands tries to use. And it seems to be lying about this too - because we report an error otherwise. Can someone else with Windows reproduce this issue?

When I enable OpenGL, the minimap appears as it should (that is, as it is in build-17), I this mode is unusable to me because all the buttons appear in black (I have written about this in another bug report - it seems to be a incompability between OpenGL and my Laptop/Graphics card that no one else can reproduce).
Therefore, I always play without OpenGL, which has worked fine until the minimap issue appeared.

My graphics card is Intel HD Graphics. The laptop was bought in 2011, the graphics driver is from January 2012 (so no really old stuff). I can provide more information if needed. If I have time, I will look if I can install a newer version of the graphics driver to solve the problem.

So you are saying this happens when using SDL? Can you check if you are using 32bit color depth? you might need to chang ethis in the conf file. Widelands should no longer use 16 bit in any circumstance.

Not sure about SDL: If it is the alternative to OpenGL, then I use it. For some reason, Widelands used 16bit. I have then changed it to 32bit, but the map still looked strange.
Then I had an idea: What if I combined both - 32bit and OpenGL? And it worked! The buttons are readable and the minimap appears as it should. So it was about an incompability between 16bit and OpenGL. Since 16bit was probably not used by anyone (I have no idea why it was used on my laptop), this issue has not been reproduced.

I can confirm the issue an Linux.

Seems as if the terrain is not drawn correctly in the minimap if SDL rendering is active. all other overlays (player color, roads, buildings and flags) seem to work as intended.

targetted this to build18 - it's no blocker though as its only a minor graphic issue. But maybe there is a simple minimal invasive fix :)

I wouldn't say it is minor :). On Mac OS all is fine and dandy - Peter, make sure that you are using 32bit too and not 16 bit anymore (it is no longer supported).

@#9 I do. But as described in #6, the bug appears no matter whether 32-bit or 16bit is selected.

Most likely the problem was introduced with either:
http://bazaar.launchpad.net/~widelands-dev/widelands/trunk/revision/6501
or
http://bazaar.launchpad.net/~widelands-dev/widelands/trunk/revision/6703

note the changes in src/graphic/render/minimaprenderer.cc - quite some code changes... I haven't yet understand all of it :-/

I still cannot reproduce this issue on Mac - could it be something with 32bit vs 64bit issues here? This is the last outstanding bug for fixing a date for deep winter feature freeze so it is kinda critical that we get this sucker down. Can I do something to help?

I just tried to reproduce this bug. I tested on Windows 8 64bit with rev6779 in 32bit SDL mode. I got no terrain at all (playing in no fog mode) Terrain is only displayed under the player color overlay once the area is conquered. The rest shows just the wooden background texture.

I was able to repro with Shevonars hint. The reason is that terrains are not saved with alpha channel internally and there was a false assumption that then alpha = 255, which it apparently only is for opengl. I attempted a fix in r6782.

I think (but am not sure) that the OP's bug is fixed with this as well. Could all of you check this please?

I'll wait for a few days, and when I hear nothing I'll suggest a date for the winter time feature freeze.

Works fine for me (SDL on Win7 x64) , 6781 shows now terrain at all on minimap, 6782 is ok.
Could not detect any other issues.

In r6783, SDL shows the map as expected. Everything seems fine.

Released in build-18 rc1.