implemented alpha support for raw bitmaps under Mac

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@21145 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/mac/bitmap.h

@@ -94,6 +94,7 @@ public:
   WXHBITMAP     m_hBitmap;
   WXHICON       m_hIcon ;
   wxMask *      m_bitmapMask; // Optional mask
+  bool          m_hasAlpha;
 };
 
 #define M_BITMAPDATA ((wxBitmapRefData *)m_refData)
@@ -199,7 +200,7 @@ public:
 
   static void InitStandardHandlers();
 
-    // raw bitmap access support functions
+    // raw bitmap access support functions, for internal use only
     void *GetRawData(wxPixelDataBase& data, int bpp);
     void UngetRawData(wxPixelDataBase& data);
 

include/wx/rawbmp.h

@@ -196,6 +196,8 @@ public:
     int GetWidth() const { return m_width; }
     int GetHeight() const { return m_height; }
 
+    wxSize GetSize() const { return wxSize(m_width, m_height); }
+
     // the distance between two rows
     int GetRowStride() const { return m_stride; }
 
@@ -567,10 +569,9 @@ struct WXDLLEXPORT wxPixelDataOut<wxBitmap>
 
         // private: -- see comment in the beginning of the file
 
-            // NB: for efficiency reasons this class must *not* have any other
-            //     fields, otherwise it won't be put into a CPU register (as it
-            //     should inside the inner loops) by some compilers, notably
-            //     gcc
+            // for efficiency reasons this class should not have any other
+            // fields, otherwise it won't be put into a CPU register (as it
+            // should inside the inner loops) by some compilers, notably gcc
             ChannelType *m_ptr;
         };