GRIFFON: Game hangs on a black screen on PSP

[dwatteau]

This has been reported by user NiccaTales on the forums:
​https://forums.scummvm.org/viewtopic.php?t=16653

I don't own a PSP, but I can reproduce the issue with the PPSSPP emulator and the regular 2.6.0 build for that platform.

1. Download the game (the wiki says that it's freeware)
2. Start it on a PSP or on a PSP emulator
3. The game just hangs on a black screen and never starts (even if you wait 10 minutes).

I have no idea how/if ScummVM can be run in debug mode on the PSP, but FWIW I have an old MIPS netbook where I see that the game also hangs on a black screen between 45 seconds and 1 minute. It looks like it could be related to BitmapRawDecoder::decodeFrame() being slow; for example looking art/clouds.bmp takes several seconds there. But I'm not sure the PSP problem is related to this, since the game never seems to load at all on the PSP.

[ccawley2011]

This might be the same problem as with issue #12585, since the Griffon engine currently requires the same pixel format.

[dwatteau]

Indeed, that's a duplicate, I see the same content in SCUMMTRACE.TXT. Closing this issue since the other one is older and more general.