Bug in the RGB macro, I recently downloaded the latest version of MASM32 and I believe I have found a bug in the RGB macro.

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mjsalman

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Member No.: 508
Joined: 7-September 04

I recently downloaded the latest version of MASM32 and I believe I have found a bug in the RGB macro (last update to that file is Dec.4/2003)
The macro is supposed to return COLOREF in eax and is coded as follows

CODE

xor eax,eax
mov ah,blue
mov al,green
rol eax, 16
mov al,red

now if you use this maco like this RGB 255,255,255 it returns in eax FFFF00FF which is wrong, for a COLOREF the last byte must be always 0 the error comes from rol eax,16 it should be rol eax, 8 which will then return in eax 00FFFFFF
I am not sure if this is the proper place to report this, there is a provision for reporting winasm bugs but there does not seem to be any for masm32

Mike

akyprian

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Posts: 2307
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Joined: 12-May 04

hi,
This is what it is included in my MASM32 package

CODE

RGB MACRO red, green, blue
xor eax, eax
mov al, blue ; blue
rol eax, 8
mov al, green; green
rol eax, 8
mov al, red ; red
ENDM

Antonis

PS. This place is for ANYTHING related to programming using MASM


mjsalman
New Member Group: Members Posts: 4 Member No.: 508 Joined: 7-September 04	Hi: I downloaded the file m32v82r.zip which installs a newer version of MASM32 and this is where the macro has been changed and is incorrect Mike

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