[Scummvm-tracker] [ScummVM :: Bugs] #12069: King's Quest VI has a pixel rounding error

[ScummVM :: Bugs]

#12069: King's Quest VI has a pixel rounding error
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Reporter:  shadyparadox    |      Owner:  (none)
    Type:  defect          |     Status:  new
Priority:  normal          |  Component:  Graphics
 Version:                  |   Keywords:
    Game:  King's Quest 6  |
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 There appears to be a rounding error when ScummVM tries to compute each
 pixel. It happens with the backgrounds, but is even more pronounced with
 the sprites.

 I've attached screenshots of KQ6 running in ScummVM compared to the
 correct display. You can see the pixel rounding error results in a lot of
 inaccuracies, such as flattening the top of Alexander's head and dropping
 one of Saladin's eyes. Everything seems shifted upward and perhaps just
 slightly to the left.

 Since it is a pervasive problem that continually yields weird results, I
 find the game to be no longer enjoyable, and would like to find a fix.

 Like many SCI games, King's Quest VI was originally released at a 320x200
 resolution, with the backgrounds taking up a 320x190 area. However, the
 game also has an upscaled Windows version with higher quality icons and
 portraits. I couldn't figure out the exact resolution of this upscaled
 version, but it results in the backgrounds having a 640x418 resolution.
 The error could occur during this part of the process, because I haven't
 observed this issue in other SCI games.
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Ticket URL: <https://bugs.scummvm.org/ticket/12069>
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