227 lines
4.9 KiB
C++
227 lines
4.9 KiB
C++
/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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IgnoreNoModeChange.cpp
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Abstract:
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Ignore mode changes that are not really different from the current mode.
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The problem is that even if there is no real mode change, the uniqueness
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value for the mode is still updated. DirectDraw checks this value every
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time it enters any API and if the mode uniqueness value has changed, it
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resets all it's objects.
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Applications will hit this if they call ChangeDisplaySettings* and don't
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realize that even if the mode is identical, they'll still have to reset
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all their objects.
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Notes:
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This is a general purpose shim.
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History:
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01/20/2000 linstev Created
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(IgnoreNoModeChange)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(ChangeDisplaySettingsA)
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APIHOOK_ENUM_ENTRY(ChangeDisplaySettingsW)
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APIHOOK_ENUM_ENTRY(ChangeDisplaySettingsExA)
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APIHOOK_ENUM_ENTRY(ChangeDisplaySettingsExW)
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APIHOOK_ENUM_END
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BOOL
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IsModeEqual(
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DWORD dwWidth,
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DWORD dwHeight,
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DWORD dwBitsPerPel,
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DWORD dwRefresh
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)
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{
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BOOL bRet = FALSE;
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DEVMODEA dm;
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dm.dmSize = sizeof(DEVMODEA);
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//
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// Get the existing settings.
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//
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if (EnumDisplaySettingsA(0, ENUM_CURRENT_SETTINGS, &dm)) {
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//
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// Assume that 0 or 1 means default refresh.
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//
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if (dwRefresh <= 1) {
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dwRefresh = dm.dmDisplayFrequency;
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}
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bRet = (dwWidth == dm.dmPelsWidth) &&
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(dwHeight == dm.dmPelsHeight) &&
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(dwBitsPerPel == dm.dmBitsPerPel) &&
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(dwRefresh == dm.dmDisplayFrequency);
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}
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if (bRet) {
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LOGN(
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eDbgLevelInfo,
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"[IsModeEqual] Ignoring irrelevant mode change.");
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} else {
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LOGN(
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eDbgLevelInfo,
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"Mode change is required.");
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}
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return bRet;
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}
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/*++
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Force temporary change.
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--*/
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LONG
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APIHOOK(ChangeDisplaySettingsA)(
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LPDEVMODEA lpDevMode,
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DWORD dwFlags
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)
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{
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if (lpDevMode &&
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IsModeEqual(
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lpDevMode->dmPelsWidth,
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lpDevMode->dmPelsHeight,
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lpDevMode->dmBitsPerPel,
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lpDevMode->dmDisplayFrequency)) {
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return DISP_CHANGE_SUCCESSFUL;
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}
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return ORIGINAL_API(ChangeDisplaySettingsA)(
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lpDevMode,
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CDS_FULLSCREEN);
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}
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/*++
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Force temporary change.
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--*/
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LONG
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APIHOOK(ChangeDisplaySettingsW)(
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LPDEVMODEW lpDevMode,
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DWORD dwFlags
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)
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{
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if (lpDevMode &&
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IsModeEqual(
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lpDevMode->dmPelsWidth,
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lpDevMode->dmPelsHeight,
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lpDevMode->dmBitsPerPel,
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lpDevMode->dmDisplayFrequency)) {
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return DISP_CHANGE_SUCCESSFUL;
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}
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return ORIGINAL_API(ChangeDisplaySettingsW)(
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lpDevMode,
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CDS_FULLSCREEN);
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}
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/*++
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Force temporary change.
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--*/
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LONG
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APIHOOK(ChangeDisplaySettingsExA)(
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LPCSTR lpszDeviceName,
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LPDEVMODEA lpDevMode,
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HWND hwnd,
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DWORD dwflags,
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LPVOID lParam
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)
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{
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if (lpDevMode &&
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IsModeEqual(
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lpDevMode->dmPelsWidth,
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lpDevMode->dmPelsHeight,
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lpDevMode->dmBitsPerPel,
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lpDevMode->dmDisplayFrequency)) {
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return DISP_CHANGE_SUCCESSFUL;
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}
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return ORIGINAL_API(ChangeDisplaySettingsExA)(
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lpszDeviceName,
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lpDevMode,
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hwnd,
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CDS_FULLSCREEN,
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lParam);
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}
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/*++
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Force temporary change.
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--*/
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LONG
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APIHOOK(ChangeDisplaySettingsExW)(
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LPCWSTR lpszDeviceName,
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LPDEVMODEW lpDevMode,
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HWND hwnd,
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DWORD dwflags,
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LPVOID lParam
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)
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{
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if (lpDevMode &&
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IsModeEqual(
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lpDevMode->dmPelsWidth,
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lpDevMode->dmPelsHeight,
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lpDevMode->dmBitsPerPel,
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lpDevMode->dmDisplayFrequency)) {
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return DISP_CHANGE_SUCCESSFUL;
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}
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return ORIGINAL_API(ChangeDisplaySettingsExW)(
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lpszDeviceName,
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lpDevMode,
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hwnd,
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CDS_FULLSCREEN,
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lParam);
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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, ChangeDisplaySettingsA)
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APIHOOK_ENTRY(USER32.DLL, ChangeDisplaySettingsW)
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APIHOOK_ENTRY(USER32.DLL, ChangeDisplaySettingsExA)
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APIHOOK_ENTRY(USER32.DLL, ChangeDisplaySettingsExW)
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HOOK_END
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IMPLEMENT_SHIM_END
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