From a18042e77f777efae2d3732758bbc7f3cd867c4f Mon Sep 17 00:00:00 2001
From: Frank Richter <frank.richter@gmail.com>
Date: Tue, 30 Aug 2005 09:58:41 +0000
Subject: [PATCH] More elaborate IsThemeBackgroundPartiallyTransparent()
 implementation; also returns TRUE for theme parts with 32bpp images.

---
 dlls/uxtheme/draw.c | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/dlls/uxtheme/draw.c b/dlls/uxtheme/draw.c
index df28a1eee78..1a80f6d4db3 100644
--- a/dlls/uxtheme/draw.c
+++ b/dlls/uxtheme/draw.c
@@ -1849,8 +1849,28 @@ HRESULT WINAPI GetThemeTextMetrics(HTHEME hTheme, HDC hdc, int iPartId,
 BOOL WINAPI IsThemeBackgroundPartiallyTransparent(HTHEME hTheme, int iPartId,
                                                   int iStateId)
 {
-    BOOL transparent = FALSE;
+    int bgtype = BT_BORDERFILL;
+    RECT rect = {0, 0, 0, 0};
+    HBITMAP bmpSrc;
+    RECT rcSrc;
+    BOOL hasAlpha;
+    INT transparent;
+    COLORREF transparentcolor;
+
     TRACE("(%d,%d)\n", iPartId, iStateId);
-    GetThemeBool(hTheme, iPartId, iStateId, TMT_TRANSPARENT, &transparent);
-    return transparent;
+
+    if(!hTheme)
+        return FALSE;
+
+    GetThemeEnumValue(hTheme, iPartId, iStateId, TMT_BGTYPE, &bgtype);
+
+    if (bgtype != BT_IMAGEFILE) return FALSE;
+
+    if(FAILED (UXTHEME_LoadImage (hTheme, 0, iPartId, iStateId, &rect, FALSE, 
+                                  &bmpSrc, &rcSrc, &hasAlpha))) 
+        return FALSE;
+
+    get_transparency (hTheme, iPartId, iStateId, hasAlpha, &transparent,
+        &transparentcolor, FALSE);
+    return (transparent != ALPHABLEND_NONE);
 }