AGS 4: Room editor does not respect game's color depth when creating/importing backgrounds

[ivan-mogilko]

Describe the bug
If you have a 8-bit or 16-bit color depth game, then:

• creating a new room will generate a 32-bit bg.
• when importing a bg even of proper color depth, editor will still save it as 32-bit png.

It's still possible to place a 8-bit png into the Rooms/n/ folder directly, but I suspect that if editor will ever resave it, it will still use 32-bit format.

Also, 8-bit room bgs are not displayed in the game as they should, it looks like room bgs colors are not applied to the "Background" palette slots, and room instead uses colors from default palette. But this may be an unrelated issue.

AGS Version
4.0.0.1

Expected behavior
Imported room backgrounds should be stored converted to the game's color depth. When room is created programmatically (blank template) the bg should have the game's color depth.

[ivan-mogilko]

Confirmed fixed by #2354

[ivan-mogilko]

Reopened as not completely fixed yet, specifically this part:

Also, 8-bit room bgs are not displayed in the game as they should, it looks like room bgs colors are not applied to the "Background" palette slots, and room instead uses colors from default palette. But this may be an unrelated issue.

It appears that these bgs look fine in the Editor for whatever reason, but they are broken at runtime.

[ivan-mogilko]

Fixed by #2393