which is faster

[dogfish227]

im trying to get just 1 pixels color from a surface in DX7 should i use the

getlockedpixel

or getlockedarray

DX4VB says getlockedarray is faster but im guessing that this is because you normally want to look at more that one pixel so my guess is getlockedpixel

also

Sub ProcessMemory
Dim Colour as Long
Dim rArea as RECT
Dim ddsd as DDSURFACEDESC2
 
rArea.Bottom=480:rArea.Right=640
 
MainSurf.Lock rArea,ddsd, DDLOCK_WAIT,0
'We now have access to the memory. From now until the Unlock you are treading
'on thin ice......
 
'These are our two commands.
Colour=Mainsurf.GetLockedPixel(100,120)
Mainsurf.SetLockedPixel(100,120,Colour+10) 
 
MainSurf.Unlock rArea
 
End Sub

the rectangle rArea in this procedure, when you use it in the mainsurf.lock statement is just locking the part of the surface that is in the rectangle right ?

last of all,
at the end of mainsurf.lock what is the ,0 for?

thanks for all your help

[dogfish227]

well i ended up useing getlockedpixel it seemed much more liekly to be the faster way sense i wasnt need a whole array of pixels
im still wandering what that ,0 is for thought??

thanks

[Machaira]

http://msdn.microsoft.com/library/de...urfacelock.asp

Handle to a system event that should be triggered when the surface is ready to be locked.

This is from DX9, but should still be the same since it hasn't changed from DX7. It wasn't used in DX7.

[Sastraxi]

Actually, it would be about the same. GetLockedPixel locks the surface, gets the pixel, and then unlocks it. GetLockedArray locks it, then you can get any number of pixels without a penalty, and then UnLock unlocks the surface. So, basically, it would be the same.