Leaked source code of windows server 2003
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3.5 KiB

/*++
Copyright (c) 2000 Microsoft Corporation
Module Name:
ForceDisplayMode.cpp
Abstract:
This shim is for games that require a specific resolution to run at.
It takes a command line to specify the resolution: width in pixels, height
in pixels,bits per pixel if you don't specify one or more of those, we'll
use the current setting.
eg: 1024,768 will change resolution to 1024x768.
eg: ,,16 will change the color depth to 16 bit.
Notes:
This is a general purpose shim.
History:
11/08/2000 maonis Created (adopted from Force640x480x8 and Force640x480x16 shims)
03/13/2001 robkenny Converted to CString
--*/
#include "precomp.h"
IMPLEMENT_SHIM_BEGIN(ForceDisplayMode)
#include "ShimHookMacro.h"
// This module has been given an official blessing to use the str routines.
#include "strsafe.h"
#define MAX_LENGTH 1024
APIHOOK_ENUM_BEGIN
APIHOOK_ENUM_END
DWORD g_dmPelsWidth = 0;
DWORD g_dmPelsHeight = 0;
DWORD g_dmBitsPerPel = 0;
VOID
ParseCommandLine(
LPCSTR lpCommandLine
)
{
size_t slen = 0;
if (FAILED(StringCchLengthA((char *)lpCommandLine, MAX_LENGTH, &slen)))
{
DPFN( eDbgLevelError,
"[ParseCommandLine] Error in StringCchLength \n");
return;
}
LPSTR szCommandLine = (LPSTR) malloc(slen + 1);
if (!szCommandLine) {
DPFN( eDbgLevelError,
"[ParseCommandLine] not enough memory\n");
return;
}
if (FAILED(StringCchCopyA(szCommandLine, (slen + 1), lpCommandLine)))
{
DPFN( eDbgLevelError,
"[ParseCommandLine] Error in StringCchCopyA \n");
return;
}
char *token, *szCurr = szCommandLine;
if (token = strchr(szCurr, ',')) {
*token = '\0';
g_dmPelsWidth = atol(szCurr);
szCurr = token + 1;
if (token = strchr(szCurr, ',')) {
*token = '\0';
g_dmBitsPerPel = atol(token + 1);
}
g_dmPelsHeight = atol(szCurr);
} else {
g_dmPelsWidth = atol(szCurr);
}
DPFN( eDbgLevelError,
"[ParseCommandLine] width = %d pixels; height = %d pixels; color depth = %d\n", g_dmPelsWidth, g_dmPelsHeight, g_dmBitsPerPel);
free(szCommandLine);
}
VOID
ChangeMode()
{
DEVMODEA dm;
BOOL fNeedChange = FALSE;
__try {
EnumDisplaySettingsA(NULL, ENUM_CURRENT_SETTINGS, &dm);
if (g_dmPelsWidth && g_dmPelsWidth != dm.dmPelsWidth) {
dm.dmPelsWidth = g_dmPelsWidth;
fNeedChange = TRUE;
}
if (g_dmPelsHeight && g_dmPelsHeight != dm.dmPelsHeight) {
dm.dmPelsHeight = g_dmPelsHeight;
fNeedChange = TRUE;
}
if (g_dmBitsPerPel && g_dmBitsPerPel != dm.dmBitsPerPel) {
dm.dmBitsPerPel = g_dmBitsPerPel;
fNeedChange = TRUE;
}
if (fNeedChange) {
ChangeDisplaySettingsA(&dm, CDS_FULLSCREEN);
}
}
__except(1) {
DPFN( eDbgLevelWarning, "Exception trying to change mode");
};
}
/*++
Register hooked functions
--*/
BOOL
NOTIFY_FUNCTION(
DWORD fdwReason)
{
if (fdwReason == SHIM_STATIC_DLLS_INITIALIZED) {
ParseCommandLine(COMMAND_LINE);
ChangeMode();
}
return TRUE;
}
HOOK_BEGIN
CALL_NOTIFY_FUNCTION
HOOK_END
IMPLEMENT_SHIM_END