[ddraw] Fix bug 3487 take 2

Peter Berg Larsen pebl at math.ku.dk
Mon Oct 10 19:46:46 CDT 2005

On Mon, 10 Oct 2005, Lionel Ulmer wrote:

>> I still havent got the grasp of what dwSize is for if it does not reflect
>> the size allocated?, nor the size of the struct current in the mem.

> As the DDSURFACEDESC2 structure starts exactly like the DDSURFACEDESC2 one,
> the hack here is to use 'dwSize' to magically cast one structure to the
> other to be able to share code.

Hmm, then it does reflect the size of the struct currently in the memory. 
So in theory it's:

assert(to != from);
DWORD __copysize = MIN((to)->dwSize,(from)->dwSize);

in practise, because of debug and bug 2070:

assert(to != from);
DWORD __tosize   = MIN(sizeof(*(to), ,(to)->dwSize);
DWORD __fromsize = MIN(sizeof(*(from),(from)->dwSize);
DWORD __copysize = MIN(__tosize,__fromsize);

Or am I still off?


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