[PATCH] user32: Call the EnumDisplayMonitors callback using a wrapper.
Ken Thomases
ken at codeweavers.com
Wed Mar 23 21:46:32 CDT 2016
Signed-off-by: Ken Thomases <ken at codeweavers.com>
---
dlls/user32/misc.c | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/dlls/user32/misc.c b/dlls/user32/misc.c
index 071230e..be4e171 100644
--- a/dlls/user32/misc.c
+++ b/dlls/user32/misc.c
@@ -20,6 +20,8 @@
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
+#include "config.h"
+
#include <stdarg.h>
#include "windef.h"
@@ -466,11 +468,46 @@ BOOL WINAPI GetMonitorInfoW(HMONITOR hMonitor, LPMONITORINFO lpMonitorInfo)
return ret;
}
+#ifdef __i386__
+/* Some apps pass a non-stdcall callback to EnumDisplayMonitors,
+ * so we need a small assembly wrapper to call it.
+ */
+struct enumdisplaymonitors_lparam
+{
+ MONITORENUMPROC proc;
+ LPARAM lparam;
+};
+
+extern BOOL CALLBACK enumdisplaymonitors_callback_wrapper(HMONITOR monitor, HDC hdc, LPRECT rect, LPARAM lparam);
+__ASM_GLOBAL_FUNC( enumdisplaymonitors_callback_wrapper,
+ "pushl %ebp\n\t"
+ __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
+ __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
+ "movl %esp,%ebp\n\t"
+ __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
+ "subl $8,%esp\n\t"
+ "movl 20(%ebp),%eax\n\t" /* struct enumdisplaymonitors_lparam *orig = (struct enumdisplaymonitors_lparam*)lparam */
+ "pushl 4(%eax)\n\t" /* push orig->lparam */
+ "pushl 16(%ebp)\n\t"
+ "pushl 12(%ebp)\n\t"
+ "pushl 8(%ebp)\n\t"
+ "call *(%eax)\n\t" /* call orig->proc */
+ "leave\n\t"
+ __ASM_CFI(".cfi_def_cfa %esp,4\n\t")
+ __ASM_CFI(".cfi_same_value %ebp\n\t")
+ "ret $16" )
+#endif /* __i386__ */
+
/***********************************************************************
* EnumDisplayMonitors (USER32.@)
*/
BOOL WINAPI EnumDisplayMonitors( HDC hdc, LPRECT rect, MONITORENUMPROC proc, LPARAM lp )
{
+#ifdef __i386__
+ struct enumdisplaymonitors_lparam orig = { proc, lp };
+ proc = enumdisplaymonitors_callback_wrapper;
+ lp = (LPARAM)&orig;
+#endif
return USER_Driver->pEnumDisplayMonitors( hdc, rect, proc, lp );
}
--
2.6.2
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