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[WIN32K]

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Exchange fields individually in PDEVOBJ_vSwitchPdev() instead of duplicating a full PDEV structure on the stack. This saves a lot of stack space.

svn path=/trunk/; revision=58081
This commit is contained in:
Timo Kreuzer 2013-01-01 11:57:58 +00:00
parent febbf7f603
commit 46da747829
1 changed files with 37 additions and 19 deletions
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56
reactos/win32ss/gdi/eng/pdevobj.c
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@ -341,52 +341,68 @@ EngpCreatePDEV(
return ppdev;
}
VOID
FORCEINLINE
SwitchPointer(
_Inout_ PVOID pvPointer1,
_Inout_ PVOID pvPointer2)
{
PVOID *ppvPointer1 = pvPointer1;
PVOID *ppvPointer2 = pvPointer2;
PVOID pvTemp;
pvTemp = *ppvPointer1;
*ppvPointer1 = *ppvPointer2;
*ppvPointer2 = pvTemp;
}
VOID
NTAPI
PDEVOBJ_vSwitchPdev(
PPDEVOBJ ppdev,
PPDEVOBJ ppdev2)
{
PDEVOBJ pdevTmp;
DWORD tmpStateFlags;
/* Exchange data */
pdevTmp = *ppdev;
union
{
DRIVER_FUNCTIONS pfn;
GDIINFO gdiinfo;
DEVINFO devinfo;
DWORD StateFlags;
} temp;
/* Exchange driver functions */
temp.pfn = ppdev->pfn;
ppdev->pfn = ppdev2->pfn;
ppdev2->pfn = pdevTmp.pfn;
ppdev2->pfn = temp.pfn;
/* Exchange LDEVs */
ppdev->pldev = ppdev2->pldev;
ppdev2->pldev = pdevTmp.pldev;
SwitchPointer(&ppdev->pldev, &ppdev2->pldev);
/* Exchange DHPDEV */
ppdev->dhpdev = ppdev2->dhpdev;
ppdev2->dhpdev = pdevTmp.dhpdev;
SwitchPointer(&ppdev->dhpdev, &ppdev2->dhpdev);
/* Exchange surfaces and associate them with their new PDEV */
ppdev->pSurface = ppdev2->pSurface;
ppdev2->pSurface = pdevTmp.pSurface;
SwitchPointer(&ppdev->pSurface, &ppdev2->pSurface);
ppdev->pSurface->SurfObj.hdev = (HDEV)ppdev;
ppdev2->pSurface->SurfObj.hdev = (HDEV)ppdev2;
/* Exchange devinfo */
temp.devinfo = ppdev->devinfo;
ppdev->devinfo = ppdev2->devinfo;
ppdev2->devinfo = pdevTmp.devinfo;
ppdev2->devinfo = temp.devinfo;
/* Exchange gdiinfo */
temp.gdiinfo = ppdev->gdiinfo;
ppdev->gdiinfo = ppdev2->gdiinfo;
ppdev2->gdiinfo = pdevTmp.gdiinfo;
ppdev2->gdiinfo = temp.gdiinfo;
/* Exchange DEVMODE */
ppdev->pdmwDev = ppdev2->pdmwDev;
ppdev2->pdmwDev = pdevTmp.pdmwDev;
SwitchPointer(&ppdev->pdmwDev, &ppdev2->pdmwDev);
/* Exchange state flags */
tmpStateFlags = ppdev->pGraphicsDevice->StateFlags;
temp.StateFlags = ppdev->pGraphicsDevice->StateFlags;
ppdev->pGraphicsDevice->StateFlags = ppdev2->pGraphicsDevice->StateFlags;
ppdev2->pGraphicsDevice->StateFlags = tmpStateFlags;
ppdev2->pGraphicsDevice->StateFlags = temp.StateFlags;
/* Notify each driver instance of its new HDEV association */
ppdev->pfn.CompletePDEV(ppdev->dhpdev, (HDEV)ppdev);
@ -407,6 +423,7 @@ PDEVOBJ_bSwitchMode(
/* Lock the PDEV */
EngAcquireSemaphore(ppdev->hsemDevLock);
/* And everything else */
EngAcquireSemaphore(ghsemPDEV);
@ -613,9 +630,10 @@ PDEVOBJ_vGetDeviceCaps(
/** Exported functions ********************************************************/
_Must_inspect_result_ _Ret_z_
LPWSTR
APIENTRY
EngGetDriverName(IN HDEV hdev)
EngGetDriverName(_In_ HDEV hdev)
{
PPDEVOBJ ppdev = (PPDEVOBJ)hdev;