[reactos] 08/08: [WIN32K] Workaround for broken/retarded (on non-x86) FLOATOBJ_GetFloat

[Timo Kreuzer]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=9762ef948094394987a6c…

commit 9762ef948094394987a6cf7594e85847c24cceb6
Author:     Timo Kreuzer <timo.kreuzer(a)reactos.org>
AuthorDate: Sat Dec 3 15:00:28 2022 +0200
Commit:     Timo Kreuzer <timo.kreuzer(a)reactos.org>
CommitDate: Tue Dec 13 07:18:24 2022 +0100

    [WIN32K] Workaround for broken/retarded (on non-x86) FLOATOBJ_GetFloat
    
    The official definition in winddi.h always returns the result in an ULONG. This works
to assign to a FLOATL on x86, which is also an ULONG, but it doesn't work on any other
architecture, where FLOATL is actually a FLOAT, so the assignment would convert the ULONG
encoding of the FLOAT to an actual float, which gives broken results. Work around this by
simply replacing the definition with a sane one in win32k.
---
 win32ss/pch.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/win32ss/pch.h b/win32ss/pch.h
index 60bdb37a8d6..31bf7246d8b 100644
--- a/win32ss/pch.h
+++ b/win32ss/pch.h
@@ -74,6 +74,12 @@ typedef struct _SECURITY_ATTRIBUTES SECURITY_ATTRIBUTES,
*LPSECURITY_ATTRIBUTES;
 /* SEH support with PSEH */
 #include <pseh/pseh2.h>
 
+/* The native x64 definition of FLOATOBJ_GetFloat in winddi.h is retarded. Use this
instead. */
+#ifndef _M_IX86
+#undef FLOATOBJ_GetFloat
+#define FLOATOBJ_GetFloat(pf) (*(pf))
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif