ghosts are rendered as eyes only, no color is shown

[pbarsic]

OS: Ubuntu 18.0.4
SDL version: 2.0
gcc version: 7.4.0

The ghosts are rendered as eyes only, no ghost color is shown (see screenshot).

This is because the black background on augen_0.png, augen_1.png, augen_2.png, and augen_3.png are not set to transparent. I think it is a conflict between the transparent index that you have set for the ghost images (255) and the eye images (0).

The fix I employed was:

1. 1. Insert the following at line 195 of src/screen.cpp: SDL_SetSurfaceBlendMode(surface, SDL_BLENDMODE_BLEND);
2. Modify the augen_?.png files so that alpha=0 for the background
3. Change the last argument of lines 65-68 of src/ghost_figur.cpp from 0 to -1.

There is a similar bug affecting gfx/escaping_ghost_?.png.

I have these fixes in a branch. I'll send it to you if you are interested, or push it if you grant access to me.

This is the result of my fix:

[ebuc99]

Thanks for your help. I have add you as collaborator, so you can put the branch to the project.

[p-martin]

Hi Paul,
What kind of graphics card are you using?
In the past, I temporarily had this problem as well. For me, it seemed to be related to using the proprietary nvidia driver rather than the nouveau (which worked in this case).
However, at this moment, I'm not able to reproduce the problem even using nvidia.

My configuration:
OS: Arch Linux (few days old due to rolling release)
SDL: 2.0.10, SDL-image: 2.0.5
gcc: 9.2.0
nvidia driver version: 390.132

I just committed 0d1c2eb. Could you please try if this rearrangement already helps?
If not, I will try to set up a config which is similar to yours.