I forget to say this EDD_SURFACE DxLock expect it is always value 2 in Type other wise the lock will fail. here is some of my code it is part of DxLock lock process I am working on. here is the code I am working on and some rethinking how GDIOBJHDR can look like.
Some rethinking why not ?
typedef struct _GDIOBJHDR { HGDIOBJ hHmgr; union { struct { WORD count; }; struct { WORD type; } u; DWORD Entry; }
ULONG cExcLock; ULONG Tid; }GDIOBJHDR, PGDIOBJHDR;
DWORD STDCALL DxLock(HANDLE hSurface, PDD_LOCKDATA puLockData, HDC hdcClip) { DD_LOCKDATA LockData; PEDD_SURFACE pSurface;
_SEH_TRY { ProbeForRead(puLockData, sizeof(DD_LOCKDATA), 1); RtlCopyMemory(&LockData,puLockData, sizeof(DD_LOCKDATA)); } _SEH_HANDLE { _SEH_YIELD(return DDERR_GENERIC); } _SEH_END;
pSurface = DdHmgLock(hSurface,2,0); ....... ....... ....... }
LPVOID STDCALL DdHmgLock(HANDLE hObject, WORD GdiObjectType, BOOL AcqurieHmgrSemaphoreAndRelease ) { PGDIOBJHDR pObjhdr = NULL; PVOID pRetObjhdr = NULL; DWORD position = hObject & 0x1FFFFF;
/* check see if we need Acqurie Hmgr Semaphore */ if ( !AcqurieHmgrSemaphoreAndRelease ) { DdHmgAcquireHmgrSemaphore(); }
/* Check see if position we are in range, gcMaxDdHmgr is our counter how many object we got */ if ( position < gcMaxDdHmgr ) { /* Get our Gdi Object */ pObjhdr = (LPBYTE)gpentDdHmgr + (position * sizeof(GDIOBJHDR) );
/* Vaildate if we got the object type we wanted */ if ( ( pObjhdr->Type == GdiObjectType ) && (( pObjhdr->Entry) == (((DWORD)hObject >> 21) & 0x7FF) ) && (pObjhdr->cExcLock) && (pObjhdr->Tid != PsGetCurrentThread() ) ) { InterlockedIncrement(pObjhdr->cExcLock); pObjhdr->Tid = PsGetCurrentThread(); pRetObjhdr = (PVOID) pObjhdr; } }
/* check see if we need release Hmgr Semaphore */ if ( !AcqurieHmgrSemaphoreAndRelease ) { DdHmgReleaseHmgrSemaphore(); }
return pRetObjhdr; } Original Message ----- From: Magnus Olsen To: ReactOS Development List Sent: Sunday, December 30, 2007 12:07 PM Subject: Re: [ros-dev] About GDIOBJHDR header changes
Hi Jim and Timo I base it on how dxg.sys acts when it lock a dx object. rember that DWORD store data diffent the 2 we see it should be the type rember that the byte order for DWORD is casted it mean if it got 2 it is store in the higher part see memory layout
memory layout --------------------------------- | WORD 00 | bit 0-15 | --------------------------------- | WORD 01 | bit 16-31 | ---------------------------------
word 01 and word 00 are swaped when it display as DWORD, in DWORD the word 01 will become bit 0-15, word 00 will become bit 16-31 that expain the value 0,1,2,3 we see in PVOID Entry. if we split it. we will see value 0,1,2,3,4 in Type amd count is often 0. I have no clude yet what diffent type it exists.
the count is often set to 0 and the type is set to 0, 1, 2, 3 and so on.
Still any unclear why I think it we should Split PVOID into two diffent members ?
----- Original Message ----- From: Timo Kreuzer To: ReactOS Development List Sent: Sunday, December 30, 2007 4:24 AM Subject: Re: [ros-dev] About GDIOBJHDR header changes
James Tabor schrieb: Hi!
typedef struct _GDIOBJHDR { HGDIOBJ hHmgr; PVOID unknownCount; ULONG cExcLock; ULONG Tid; }GDIOBJHDR, PGDIOBJHDR;
I thought PVOID unknownCount was PVOID pEntry which is the pointer back to the handle table entry. That could have changed since this is based on Yuan book and w2k. Remember too, that DxDD handles are different and handled outside normal DC's. Yuan says it's pEntry, I came to the conclusion it's probably a counter, because it's values are small like 1,2,3..0x200 see http://www.reactos.org/wiki/index.php/Techwiki/win32k/GDIOBJHDR Has probably changed from 2k to xp. I agree, DX objects might be different, maybe they have a different header structure, I have never looked at DX object memory, so I don't know how they look... I just can say that all GDI objects I have dumped the memory of, don't have a type field there, it's always been 0.
Timo
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