/pidgin/main: fa3c41b69e47: win32: Fix window placement on Windo...

[Eion Robb]

Changeset: fa3c41b69e47ded8e0214d5e8c8ffc689a8fe051
Author:	 Eion Robb <eion at robbmob.com>
Date:	 2016-02-03 15:56 -0500
Branch:	 release-2.x.y
URL: https://hg.pidgin.im/pidgin/main/rev/fa3c41b69e47

Description:

win32: Fix window placement on Windows >= Vista. Fixes #16830

diffstat:

 pidgin/win32/gtkwin32dep.c |  39 ++++++++++++++++++++++++++++++++++++++-
 1 files changed, 38 insertions(+), 1 deletions(-)

diffs (51 lines):

diff --git a/pidgin/win32/gtkwin32dep.c b/pidgin/win32/gtkwin32dep.c
--- a/pidgin/win32/gtkwin32dep.c
+++ b/pidgin/win32/gtkwin32dep.c
@@ -468,9 +468,46 @@ get_WorkingAreaRectForWindow(HWND hwnd, 
 void winpidgin_ensure_onscreen(GtkWidget *win) {
 	RECT winR, wAR, intR;
 	HWND hwnd = GDK_WINDOW_HWND(win->window);
+typedef HRESULT (WINAPI* DwmIsCompositionEnabledFunction)(BOOL*);
+typedef HRESULT (WINAPI* DwmGetWindowAttributeFunction)(HWND, DWORD, PVOID, DWORD);
+static HMODULE dwmapi_module = NULL;
+static DwmIsCompositionEnabledFunction DwmIsCompositionEnabled = NULL;
+static DwmGetWindowAttributeFunction DwmGetWindowAttribute = NULL;
+#ifndef DWMWA_EXTENDED_FRAME_BOUNDS
+#	define DWMWA_EXTENDED_FRAME_BOUNDS 9
+#endif
+
+static RECT
+get_actualWindowRect(HWND hwnd)
+{
+	RECT winR;
+	
+	GetWindowRect(hwnd, &winR);
+	
+	if (dwmapi_module == NULL) {
+		dwmapi_module = GetModuleHandleW(L"dwmapi.dll");
+		if (dwmapi_module != NULL) {
+			DwmIsCompositionEnabled = (DwmIsCompositionEnabledFunction) GetProcAddress(dwmapi_module, "DwmIsCompositionEnabled");
+			DwmGetWindowAttribute = (DwmGetWindowAttributeFunction) GetProcAddress(dwmapi_module, "DwmGetWindowAttribute");
+		}
+	}
+	
+	if (DwmIsCompositionEnabled != NULL && DwmGetWindowAttribute != NULL) {
+		BOOL pfEnabled;
+		if (SUCCEEDED(DwmIsCompositionEnabled(&pfEnabled))) {
+			RECT tempR;
+			if (SUCCEEDED(DwmGetWindowAttribute(hwnd, DWMWA_EXTENDED_FRAME_BOUNDS, &tempR, sizeof(tempR)))) {
+				winR = tempR;
+			}
+		}
+	}
+	
+	return winR;
+}
+
 
 	g_return_if_fail(hwnd != NULL);
-	GetWindowRect(hwnd, &winR);
+	winR = get_actualWindowRect(hwnd);
 
 	purple_debug_info("win32placement",
 			"Window RECT: L:%ld R:%ld T:%ld B:%ld\n",