84 lines
1.6 KiB
C++
84 lines
1.6 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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EmulateGetDeviceCaps.cpp
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Abstract:
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Fix known incompatibilities in GetDeviceCaps.
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Currently we know of:
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1. NUMRESERVED always returns 20 on NT, but on win9x returns 0 in non-
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palettized modes. This was considered too great a regression risk to
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change the behavior of NT.
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Notes:
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This is a general purpose shim.
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(t-adams) MSDN states that along with NUMRESERVED, both SIZEPALETTE and
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COLORRES are valid only if the display is in paletted mode. I've
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experimentally determined that SIZEPALETTE always returns 0 in non-paletted
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modes, and that COLORRES seems to follow BITSPIXEL. These behaviors don't
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seem like they will present any problems since SIZEPALETTE * COLORRES will
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be 0.
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History:
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02/17/2000 linstev Created
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09/13/2000 t-adams Added to Notes
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(EmulateGetDeviceCaps)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(GetDeviceCaps)
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APIHOOK_ENUM_END
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/*++
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Check for known problems.
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--*/
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int
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APIHOOK(GetDeviceCaps)(
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HDC hdc,
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int nIndex
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)
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{
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int iRet = ORIGINAL_API(GetDeviceCaps)(hdc, nIndex);
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switch (nIndex)
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{
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case NUMRESERVED:
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if (ORIGINAL_API(GetDeviceCaps)(hdc, BITSPIXEL) > 8) {
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iRet = 0;
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}
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}
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return iRet;
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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(GDI32.DLL, GetDeviceCaps)
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HOOK_END
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IMPLEMENT_SHIM_END
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