129 lines
2.6 KiB
C++
129 lines
2.6 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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EmulateDrawText.cpp
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Abstract:
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Win9x DrawText modified the rectangle coordinates if they were
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out of range. With Win2000 the text will not appear on the
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screen with out of range formatting dimensions. The solution
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is to toggle the high order bit for out of range coordinates.
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We also cast nCount to 16-bits for apps which pass 0x0000ffff
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instead of a true -1, because the Win9x thunk does this.
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Notes:
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This is a general purpose shim.
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History:
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05/03/2000 a-michni Created
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(EmulateDrawText)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(DrawTextA)
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APIHOOK_ENUM_ENTRY(DrawTextW)
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APIHOOK_ENUM_END
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/*++
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Correct the formatting dimensions if necessary.
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--*/
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long
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Fix_Coordinate(
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long nCoord
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)
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{
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if ((nCoord & 0x80000000) && ((nCoord & 0x40000000) == 0)) {
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nCoord &= 0x7FFFFFFF;
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} else if (((nCoord & 0x80000000) == 0) && (nCoord & 0x40000000)) {
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nCoord |= 0x10000000;
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}
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return nCoord;
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}
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LPRECT
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Fix_Coordinates(
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LPRECT lpRect
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)
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{
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//
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// Check bit 32, if it is on and bit 31 is off or bit 32 is off and
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// bit 31 is on, flip bit 32.
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//
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lpRect->left = Fix_Coordinate(lpRect->left);
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lpRect->right = Fix_Coordinate(lpRect->right);
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lpRect->top = Fix_Coordinate(lpRect->top);
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lpRect->bottom= Fix_Coordinate(lpRect->bottom);
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return lpRect;
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}
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int
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APIHOOK(DrawTextA)(
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HDC hDC, // handle to DC
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LPCSTR lpString, // text to draw
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int nCount, // text length
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LPRECT lpRect, // formatting dimensions
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UINT uFormat // text-drawing options
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)
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{
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return ORIGINAL_API(DrawTextA)(
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hDC,
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lpString,
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(__int16) nCount,
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Fix_Coordinates(lpRect),
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uFormat);
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}
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int
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APIHOOK(DrawTextW)(
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HDC hDC, // handle to DC
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LPCWSTR lpString, // text to draw
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int nCount, // text length
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LPRECT lpRect, // formatting dimensions
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UINT uFormat // text-drawing options
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)
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{
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return ORIGINAL_API(DrawTextW)(
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hDC,
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lpString,
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(__int16) nCount,
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Fix_Coordinates(lpRect),
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uFormat);
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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(USER32.DLL, DrawTextA)
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APIHOOK_ENTRY(USER32.DLL, DrawTextW)
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HOOK_END
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IMPLEMENT_SHIM_END
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