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Dark GDK / Baffling bug with dbPoint() and RGB values

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Unkelben
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Joined: 2nd Feb 2004
Location: Montréal, Canada
Posted: 16th Dec 2006 00:08
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I sample a pixel with dbPoint to a DWORD, then I clean it to keep the color data :

couleur = couleur&0x00ffffff;

On all tested machines (many! This code has been there for almost two years!), this works.

But I have one customer on whose machine the pixels aren't the same color! Here's an example, A being normal, B being him...

A:111111110000000000000000
B:111111101111111000000000

A:000000001111111111111111
B:000000001111111011111110

It seems the last bit of some bytes have problems. Does that mean anything to anyone?!

Jonathan
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APEXnow
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21
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Joined: 15th Apr 2003
Location: On a park bench
Posted: 16th Dec 2006 04:39
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If he's running in 16bit mode, rather than 32bit mode, will the value vary? I'm not sure if dbPoint acts on a perpixel or direct memory access. You could try performing the test on your system for both 32bit and 16bit video modes to see if the colour information varies.

Paul.

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Unkelben
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Location: Montréal, Canada
Posted: 16th Dec 2006 18:18
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No variation in 16bits. Anyways, the display is set to 32 bits in the game...

Jonathan
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APEXnow
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Posted: 16th Dec 2006 19:07
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Hmm, that is odd.

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EddieB
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Location: United Kingdom
Posted: 16th Dec 2006 23:05
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High endian and low endian possibly?
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Unkelben
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Posted: 19th Dec 2006 18:25
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Good idea, but not that either!

Jonathan
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Argon Knight
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Joined: 29th Aug 2002
Location: Gastonia, NC, USA
Posted: 20th Dec 2006 05:24
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oh, classic Obi Wan.
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Unkelben
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Posted: 21st Dec 2006 16:00
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I don't get the Obi Wan reference...

Jonathan
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