134 lines
3.5 KiB
C++
134 lines
3.5 KiB
C++
/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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HeroSDVD.cpp
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Abstract:
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Background: clicking the nonclient close button when a movie clip is playing causes the app
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to hang and then AV when themes are active. The DisableThemes shim has no effect.
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This is related to the app's repeated calls to SetClassLong(hwnd, GCL_HICON) in order to produce
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the effect of an animated window icon. This generates frequent requests to redraw the window's icon,
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which in turn generates the NCUAHDRAWCAPTION. This is a huge perf hit to the app in any case,
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but particularly if the SetClassLong call makes an extra round trip to user mode and back as a
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result of the SendMessage.
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When the user hits the Close button, the app's WM_SYSCOMMAND handler resets an event that is waited
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on by the icon-transitioning thread, and then puts himself (the UI thread) to sleep.
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Then he calls SetClassLong(..., GCL_ICON) one last time from the icon-switching thread,
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which hangs the app because the message-pumping thread is sleeping. This does not repro when win32k
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doesn't send the NCUAHDRAWCAPTION message; i.e., when user API hooks are not active.
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The DisableTheme does not work because this shim operates in user mode on a per-process basis.
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This shim has no effect on win32k, which does special processing on a session-wide basis when themes are enabled.
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To address this, we shim this app to nop on SetClassLong(..., GCL_HICON), which means the app at
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best loses animation of the icon and at worst display a bogus icon when themes are active,
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Notes:
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This is an app specific shim.
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History:
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05/11/2001 scotthan Created
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(HeroSDVD)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(SetClassLongA)
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APIHOOK_ENUM_END
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typedef BOOL (STDAPICALLTYPE * PFNTHEMEACTIVE)(void);
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PFNTHEMEACTIVE g_pfnThemeActive;
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HINSTANCE g_hinstUxtheme;
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HINSTANCE LoadUxTheme()
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{
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if( NULL == g_hinstUxtheme )
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{
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HINSTANCE hinst = LoadLibrary(TEXT("UxTheme.dll"));
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if( NULL != hinst )
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{
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if( InterlockedCompareExchangePointer( (PVOID*)&g_hinstUxtheme, hinst, NULL ) )
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{
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FreeLibrary(hinst); // already loaded.
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}
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}
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}
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return g_hinstUxtheme;
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}
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DWORD
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APIHOOK(SetClassLongA)(
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IN HWND hwnd,
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IN int nIndex,
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IN LONG dwNewLong
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)
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{
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if( GCL_HICON == nIndex )
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{
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if( NULL == g_pfnThemeActive )
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{
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HINSTANCE hinst = LoadUxTheme();
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if( hinst )
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{
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g_pfnThemeActive = (PFNTHEMEACTIVE)GetProcAddress( hinst, "IsThemeActive" );
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}
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}
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if( g_pfnThemeActive && g_pfnThemeActive() )
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{
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// no-op the request to change icon, and return the current one.
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return GetClassLongA(hwnd, nIndex);
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}
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}
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return ORIGINAL_API(SetClassLongA)(hwnd, nIndex, dwNewLong);
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}
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/*++
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Register hooked functions
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--*/
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BOOL
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NOTIFY_FUNCTION(
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DWORD fdwReason)
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{
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if( DLL_PROCESS_ATTACH == fdwReason )
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{
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g_hinstUxtheme = NULL;
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g_pfnThemeActive = NULL;
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}
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else if( DLL_PROCESS_DETACH == fdwReason )
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{
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if( g_hinstUxtheme )
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{
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FreeLibrary(g_hinstUxtheme);
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g_hinstUxtheme = NULL;
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}
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g_pfnThemeActive = NULL;
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}
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return TRUE;
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}
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HOOK_BEGIN
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CALL_NOTIFY_FUNCTION
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APIHOOK_ENTRY(USER32.DLL, SetClassLongA )
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HOOK_END
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IMPLEMENT_SHIM_END
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