X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/2bdba43f026251eafe1cfe3ad35ee4ca08f9253b..ada083260a7c74b3bd084f6092a298e64a6c6b0f:/include/wx/rawbmp.h

diff --git a/include/wx/rawbmp.h b/include/wx/rawbmp.h
index 6a15042c23..d636d586e5 100644
--- a/include/wx/rawbmp.h
+++ b/include/wx/rawbmp.h
@@ -413,7 +413,11 @@ struct wxPixelDataOut<wxImage>
             ChannelType& Alpha() { return *m_pAlpha; }
 
             // address the pixel contents directly (always RGB, without alpha)
-            typename PixelFormat::PixelType& Data()
+            //
+            // this can't be used to modify the image as assigning a 32bpp
+            // value to 24bpp pixel would overwrite an extra byte in the next
+            // pixel or beyond the end of image
+            const typename PixelFormat::PixelType& Data()
                 { return *(typename PixelFormat::PixelType *)m_pRGB; }
 
         // private: -- see comment in the beginning of the file
@@ -600,6 +604,10 @@ struct wxPixelDataOut<wxBitmap>
             // address the pixel contents directly
             //
             // warning: the format is platform dependent
+            //
+            // warning 2: assigning to Data() only works correctly for 16bpp or
+            //            32bpp formats but using it for 24bpp ones overwrites
+            //            one extra byte and so can't be done
             typename PixelFormat::PixelType& Data()
                 { return *(typename PixelFormat::PixelType *)m_ptr; }
 
@@ -680,7 +688,18 @@ struct wxPixelDataOut<wxBitmap>
 
 #endif //wxUSE_GUI
 
-template <class Image, class PixelFormat = typename wxPixelFormatFor<Image>::Format >
+// FIXME-VC6: VC6 doesn't like typename in default template parameters while
+//            it is necessary with standard-conforming compilers, remove this
+//            #define and just use typename when we drop VC6 support
+#if defined(__VISUALC__) && !wxCHECK_VISUALC_VERSION(7)
+    #define wxTYPENAME_IN_TEMPLATE_DEFAULT_PARAM
+#else
+    #define wxTYPENAME_IN_TEMPLATE_DEFAULT_PARAM typename
+#endif
+
+template <class Image,
+          class PixelFormat = wxTYPENAME_IN_TEMPLATE_DEFAULT_PARAM
+                                wxPixelFormatFor<Image>::Format >
 class wxPixelData :
     public wxPixelDataOut<Image>::template wxPixelDataIn<PixelFormat>
 {