100 lines
1.7 KiB
C++
100 lines
1.7 KiB
C++
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/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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ForceDirectDrawEmulation.cpp
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Abstract:
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Some applications don't handle aspects of hardware acceleration correctly.
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For example, Dragon Lore 2 creates a surface and assumes that the pitch is
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double the width for 16bpp. However, this is not always the case.
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DirectDraw exposes this through the lPitch parameter when a surface is
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locked.
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The fix is to force DirectDraw into emulation, in which case all surfaces
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will be in system memory and so the pitch really will be related to the
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width.
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Notes:
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This is a general purpose shim.
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History:
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03/11/2000 linstev Created
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(ForceDirectDrawEmulation)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(RegQueryValueExA)
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APIHOOK_ENUM_END
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/*++
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Force DirectDraw into emulation.
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--*/
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LONG
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APIHOOK(RegQueryValueExA)(
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HKEY hKey,
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LPSTR lpValueName,
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LPDWORD lpReserved,
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LPDWORD lpType,
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LPBYTE lpData,
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LPDWORD lpcbData
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)
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{
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if (_tcsicmp("EmulationOnly", lpValueName) == 0)
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{
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if (lpType)
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{
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*lpType = REG_DWORD;
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}
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if (lpData)
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{
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*((DWORD *)lpData) = 1;
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}
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if (lpcbData)
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{
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*lpcbData = 4;
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}
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return ERROR_SUCCESS;
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}
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return ORIGINAL_API(RegQueryValueExA)(
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hKey,
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lpValueName,
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lpReserved,
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lpType,
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lpData,
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lpcbData);
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}
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/*++
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Register hooked functions
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--*/
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HOOK_BEGIN
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APIHOOK_ENTRY(ADVAPI32.DLL, RegQueryValueExA)
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HOOK_END
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IMPLEMENT_SHIM_END
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