[ros-bugs] [Bug 6241] New: WhatColor app: Bug in NtGDIGetPixel, returning 000000

[ReactOS.Bugzilla at reactos.org]

http://www.reactos.org/bugzilla/show_bug.cgi?id=6241

           Summary: WhatColor app: Bug in  NtGDIGetPixel, returning 000000
           Product: ReactOS
           Version: TRUNK
          Platform: x86 Hardware
        OS/Version: ReactOS
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: Win32
        AssignedTo: ros-bugs at reactos.org
        ReportedBy: vicmarcal at hotmail.com
         QAContact: ros-bugs at reactos.org


r51583 Vbox
WhatColor is a small app that shows in a Tooltip the RGB color of any pixel of
the screen.
In ReactOS it is always showing 000000
The app can be downloaded from here:
http://www.donationcoder.com/Software/Skrommel/WhatColor/WhatColor.exe

I have tracked down the Bug to NtGDIGetPixel with the following findings:
The COLORREF returned by NtGDIGetPixel is always 000000.
Inside NtGdiPixel it goes into:
if ((dc->rosdc.CombinedClip == NULL) ||
        (RECTL_bPointInRect(&dc->rosdc.CombinedClip->rclBounds, XPos, YPos)))
Then it falls into: if (psurf)
Now it calls EXLATEOBJ_vInitialize(&exlo, psurf->ppal, &gpalRGB, 0, 0xffffff,
0)
Afterwards it calls XLATEOBJ_iXlate and assigns its ULONG return(always 000000)
to a COLORREF variable(should it be casted?).
One of these 2 functions is bugged.


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