-typedef wxPixelFormat<unsigned char, 24,
- #ifdef __WXMSW__
- 2, 1, 0
- #else // !__WXMSW__
- 0, 1, 2
- #endif // __WXMSW__/!__WXMSW__
- > wxNativePixelFormat;
+#if defined(__WXMSW__)
+ // under MSW the RGB components are inversed, they're in BGR order
+ typedef wxPixelFormat<unsigned char, 24, 2, 1, 0> wxNativePixelFormat;
+
+ #define wxPIXEL_FORMAT_ALPHA 3
+#elif defined(__WXMAC__)
+ // under Mac, first component is unused but still present, hence we use
+ // 32bpp, not 24
+ typedef wxPixelFormat<unsigned char, 32, 1, 2, 3> wxNativePixelFormat;
+
+ #define wxPIXEL_FORMAT_ALPHA 0
+#endif