don't modify all wxBitmaps sharing the same wxBitmapRefData when SetMask() is called

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@28434 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/gdiimage.h

@@ -44,6 +44,16 @@ public:
         m_handle = 0;
     }
 
+    wxGDIImageRefData(const wxGDIImageRefData& data)
+    {
+        m_width = data.m_width;
+        m_height = data.m_height;
+        m_depth = data.m_depth;
+
+        // can't copy handles like this, derived class copy ctor must do it!
+        m_handle = NULL;
+    }
+
     // accessors
     bool IsOk() const { return m_handle != 0; }
 
@@ -142,14 +152,11 @@ public:
     wxGDIImageRefData *GetGDIImageData() const
         { return (wxGDIImageRefData *)m_refData; }
 
-    // create data if we don't have it yet
-    void EnsureHasData() { if ( IsNull() ) m_refData = CreateData(); }
-
     // accessors
     WXHANDLE GetHandle() const
         { return IsNull() ? 0 : GetGDIImageData()->m_handle; }
     void SetHandle(WXHANDLE handle)
-        { EnsureHasData(); GetGDIImageData()->m_handle = handle; }
+        { AllocExclusive(); GetGDIImageData()->m_handle = handle; }
 
     bool Ok() const { return GetHandle() != 0; }
 
@@ -157,13 +164,13 @@ public:
     int GetHeight() const { return IsNull() ? 0 : GetGDIImageData()->m_height; }
     int GetDepth() const { return IsNull() ? 0 : GetGDIImageData()->m_depth; }
 
-    void SetWidth(int w) { EnsureHasData(); GetGDIImageData()->m_width = w; }
-    void SetHeight(int h) { EnsureHasData(); GetGDIImageData()->m_height = h; }
-    void SetDepth(int d) { EnsureHasData(); GetGDIImageData()->m_depth = d; }
+    void SetWidth(int w) { AllocExclusive(); GetGDIImageData()->m_width = w; }
+    void SetHeight(int h) { AllocExclusive(); GetGDIImageData()->m_height = h; }
+    void SetDepth(int d) { AllocExclusive(); GetGDIImageData()->m_depth = d; }
 
     void SetSize(int w, int h)
     {
-        EnsureHasData();
+        AllocExclusive();
         GetGDIImageData()->SetSize(w, h);
     }
     void SetSize(const wxSize& size) { SetSize(size.x, size.y); }
@@ -176,6 +183,9 @@ protected:
     // create the data for the derived class here
     virtual wxGDIImageRefData *CreateData() const = 0;
 
+    // implement the wxObject method in terms of our, more specific, one
+    virtual wxObjectRefData *CreateRefData() const { return CreateData(); }
+
     static wxGDIImageHandlerList ms_handlers;
 };