Implement "manual" image sharing(as opposed to using LoadImage() with

LR_SHARED) by keeping the loaded images in a list. This is needed for
proper alpha support later on since once-per-image preparations will
be needed then.

dlls/uxtheme/draw.c

@@ -212,13 +212,14 @@ static HRESULT UXTHEME_LoadImage(HTHEME hTheme, HDC hdc, int iPartId, int iState
     int imagecount = 1;
     BITMAP bmp;
     WCHAR szPath[MAX_PATH];
+    BOOL hasAlpha;
     PTHEME_PROPERTY tp = UXTHEME_SelectImage(hTheme, hdc, iPartId, iStateId, pRect, glyph);
     if(!tp) {
         FIXME("Couldn't determine image for part/state %d/%d, invalid theme?\n", iPartId, iStateId);
         return E_PROP_ID_UNSUPPORTED;
     }
     lstrcpynW(szPath, tp->lpValue, min(tp->dwValueLen+1, sizeof(szPath)/sizeof(szPath[0])));
-    *hBmp = MSSTYLES_LoadBitmap(hdc, hTheme, szPath);
+    *hBmp = MSSTYLES_LoadBitmap(hTheme, szPath, &hasAlpha);
     if(!*hBmp) {
         TRACE("Failed to load bitmap %s\n", debugstr_w(szPath));
         return HRESULT_FROM_WIN32(GetLastError());

dlls/uxtheme/msstyles.c

@@ -48,6 +48,7 @@ BOOL MSSTYLES_GetNextToken(LPCWSTR lpStringStart, LPCWSTR lpStringEnd, LPCWSTR *
 void MSSTYLES_ParseThemeIni(PTHEME_FILE tf, BOOL setMetrics);
 
 extern HINSTANCE hDllInst;
+extern int alphaBlendMode;
 
 #define MSSTYLES_VERSION 0x0003
 
@@ -214,6 +215,13 @@ void MSSTYLES_CloseThemeFile(PTHEME_FILE tf)
                     HeapFree(GetProcessHeap(), 0, pcls);
                 }
             }
+            while (tf->images)
+            {
+                PTHEME_IMAGE img = tf->images;
+                tf->images = img->next;
+                DeleteObject (img->image);
+                HeapFree (GetProcessHeap(), 0, img);
+            }
             HeapFree(GetProcessHeap(), 0, tf);
         }
     }
@@ -868,10 +876,11 @@ PTHEME_PROPERTY MSSTYLES_FindProperty(PTHEME_CLASS tc, int iPartId, int iStateId
     return NULL;
 }
 
-HBITMAP MSSTYLES_LoadBitmap(HDC hdc, PTHEME_CLASS tc, LPCWSTR lpFilename)
+HBITMAP MSSTYLES_LoadBitmap (PTHEME_CLASS tc, LPCWSTR lpFilename, BOOL* hasAlpha)
 {
     WCHAR szFile[MAX_PATH];
     LPWSTR tmp;
+    PTHEME_IMAGE img;
     lstrcpynW(szFile, lpFilename, sizeof(szFile)/sizeof(szFile[0]));
     tmp = szFile;
     do {
@@ -879,7 +888,29 @@ HBITMAP MSSTYLES_LoadBitmap(HDC hdc, PTHEME_CLASS tc, LPCWSTR lpFilename)
         if(*tmp == '/') *tmp = '_';
         if(*tmp == '.') *tmp = '_';
     } while(*tmp++);
-    return LoadImageW(tc->hTheme, szFile, IMAGE_BITMAP, 0, 0, LR_SHARED|LR_CREATEDIBSECTION);
+
+    /* Try to locate in list of loaded images */
+    img = tc->tf->images;
+    while (img)
+    {
+        if (lstrcmpiW (szFile, img->name) == 0)
+        {
+            TRACE ("found %p %s: %p\n", img, debugstr_w (img->name), img->image);
+            *hasAlpha = img->hasAlpha;
+            return img->image;
+        }
+        img = img->next;
+    }
+    /* Not found? Load from resources */
+    img = HeapAlloc (GetProcessHeap(), 0, sizeof (THEME_IMAGE));
+    img->image = LoadImageW(tc->hTheme, szFile, IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION);
+    img->hasAlpha = *hasAlpha = FALSE; /* TODO: real check */
+    /* ...and stow away for later reuse. */
+    lstrcpyW (img->name, szFile);
+    img->next = tc->tf->images;
+    tc->tf->images = img;
+    TRACE ("new %p %s: %p\n", img, debugstr_w (img->name), img->image);
+    return img->image;
 }
 
 BOOL MSSTYLES_GetNextInteger(LPCWSTR lpStringStart, LPCWSTR lpStringEnd, LPCWSTR *lpValEnd, int *value)

dlls/uxtheme/msstyles.h

@@ -59,6 +59,14 @@ typedef struct _THEME_CLASS {
     struct _THEME_CLASS *next;
 } THEME_CLASS, *PTHEME_CLASS;
 
+typedef struct _THEME_IMAGE {
+    WCHAR name[MAX_PATH];
+    HBITMAP image;
+    BOOL hasAlpha;
+    
+    struct _THEME_IMAGE *next;
+} THEME_IMAGE, *PTHEME_IMAGE;
+
 typedef struct _THEME_FILE {
     DWORD dwRefCount;
     HMODULE hTheme;
@@ -71,6 +79,7 @@ typedef struct _THEME_FILE {
 
     PTHEME_CLASS classes;
     PTHEME_PROPERTY metrics;
+    PTHEME_IMAGE images;
 } THEME_FILE, *PTHEME_FILE;
 
 typedef void* PUXINI_FILE;
@@ -88,7 +97,7 @@ PTHEME_PARTSTATE MSSTYLES_FindPartState(PTHEME_CLASS tc, int iPartId, int iState
 PTHEME_CLASS MSSTYLES_FindClass(PTHEME_FILE tf, LPCWSTR pszAppName, LPCWSTR pszClassName);
 PTHEME_PROPERTY MSSTYLES_FindProperty(PTHEME_CLASS tc, int iPartId, int iStateId, int iPropertyPrimitive, int iPropertyId);
 PTHEME_PROPERTY MSSTYLES_FindMetric(int iPropertyPrimitive, int iPropertyId);
-HBITMAP MSSTYLES_LoadBitmap(HDC hdc, PTHEME_CLASS tc, LPCWSTR lpFilename);
+HBITMAP MSSTYLES_LoadBitmap(PTHEME_CLASS tc, LPCWSTR lpFilename, BOOL* hasAlpha);
 
 HRESULT MSSTYLES_GetPropertyBool(PTHEME_PROPERTY tp, BOOL *pfVal);
 HRESULT MSSTYLES_GetPropertyColor(PTHEME_PROPERTY tp, COLORREF *pColor);