uxtheme: Use atomic functions for reference counting.

dlls/uxtheme/msstyles.c

@@ -171,7 +171,7 @@ HRESULT MSSTYLES_OpenThemeFile(LPCWSTR lpThemeFile, LPCWSTR pszColorName, LPCWST
     (*tf)->pszAvailSizes = pszSizes;
     (*tf)->pszSelectedColor = pszSelectedColor;
     (*tf)->pszSelectedSize = pszSelectedSize;
-    (*tf)->dwRefCount = 1;
+    (*tf)->refcount = 1;
     return S_OK;
 
 invalid_theme:
@@ -187,9 +187,12 @@ invalid_theme:
  */
 void MSSTYLES_CloseThemeFile(PTHEME_FILE tf)
 {
+    LONG refcount;
+
     if(tf) {
-        tf->dwRefCount--;
-        if(!tf->dwRefCount) {
+        refcount = InterlockedDecrement(&tf->refcount);
+        if (!refcount)
+        {
             if(tf->hTheme) FreeLibrary(tf->hTheme);
             if(tf->classes) {
                 while(tf->classes) {
@@ -235,7 +238,7 @@ HRESULT MSSTYLES_SetActiveTheme(PTHEME_FILE tf, BOOL setMetrics)
     tfActiveTheme = tf;
     if (tfActiveTheme)
     {
-	tfActiveTheme->dwRefCount++;
+        InterlockedIncrement(&tfActiveTheme->refcount);
 	if(!tfActiveTheme->classes)
 	    MSSTYLES_ParseThemeIni(tfActiveTheme, setMetrics);
     }
@@ -1061,7 +1064,7 @@ PTHEME_CLASS MSSTYLES_OpenThemeClass(LPCWSTR pszAppName, LPCWSTR pszClassList, U
     if(cls) {
         TRACE("Opened app %s, class %s from list %s\n", debugstr_w(cls->szAppName), debugstr_w(cls->szClassName), debugstr_w(pszClassList));
 	cls->tf = tfActiveTheme;
-	cls->tf->dwRefCount++;
+        InterlockedIncrement(&cls->tf->refcount);
         InterlockedIncrement(&cls->refcount);
         cls->dpi = dpi;
     }

dlls/uxtheme/msstyles.h

@@ -71,7 +71,7 @@ typedef struct _THEME_IMAGE {
 } THEME_IMAGE, *PTHEME_IMAGE;
 
 typedef struct _THEME_FILE {
-    DWORD dwRefCount;
+    LONG refcount;
     HMODULE hTheme;
     WCHAR szThemeFile[MAX_PATH];
     LPWSTR pszAvailColors;