#5395 closed defect (fixed)
Iceman graphics glitch
| Reported by: | SF/psycrow7 | Owned by: | wjp |
|---|---|---|---|
| Priority: | normal | Component: | Engine: SCI |
| Version: | Keywords: | ||
| Cc: | Game: | Codename: ICEMAN |
Description
Test with ScummVM 1.2.0pre52937
At the very beginning of the game the door to the cabana is displayed wrong in two different scenes. I've attached four different screen shots. The two "bad" shots are what ScummVM currently displays and the two "good" shots are what it should look like.
Ticket imported from: #3078365. Ticket imported from: bugs/5395.
Attachments (5)
Change History (13)
by , 14 years ago
| Attachment: | bad-01.png added |
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comment:1 by , 14 years ago
the 2nd near shot of the door gets broken by the current undithering code. If you turn off undithering BEFORE reaching that scene, the door will get shown correctly.
The 1st shot of the door having some white in it seems to be caused by some issue in the picture drawing code. SCI Viewer shows the same white spot.
comment:3 by , 14 years ago
Replicated first bug on Linux x86_32 with: ScummVM 1.3.0git3520-g36e3ded-dirty (Mar 2 2011 14:47:17) Features compiled in: Vorbis FLAC MP3 ALSA SEQ TiMidity RGB zLib FluidSynth Theora
The second bug is still fixed. Ran with valgrind and no memory issues are associated with the first bad drawing. Will look at the SCI drawing code to see if I can spot the cause of this issue.
comment:4 by , 14 years ago
Have identified the picture with the error as resource 2 of type Pic i.e. draw_pic 2 shows this. This is of size 13078 and located in resource.002.
Further tracing shows that this is a EGA Vector Resource View of type 0x1fe. Enabling "pic_visualise 1" and some modifications to the rendering routine in engines/sci/engine/picture.cpp allows the rendering to be followed in slow time, the error seems to occurs somewhere between position 9280 and 11900 in the input stream, but the exact point where the rendering goes wrong is not totally obvious and would need close comparison to the original picture.
Attaching debugging patch to aid further investigation by the SCI team.
comment:5 by , 14 years ago
| Owner: | set to |
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comment:6 by , 14 years ago
Thanks for the assistance. It was the flood fill at 9284.
The issue is that our flood fill code doesn't handle dithered EGA graphics properly at all. I know how to fix it, but it will take a bit of time. This was never implemented properly in our "new" gui code (isFillMatch), while it was present in freesci (IS_BOUNDARY).
comment:8 by , 14 years ago
| Resolution: | → fixed |
|---|---|
| Status: | new → closed |
Fist incorrect shot