[wx-dev] bug in wxAlphaPixelData in wxMac and wxGTK?

[Andrew Trevorrow]

Robin Dunn wrote:

> Only do the premultiplication on wxMSW.  ...

Thanks Robin.  The wxGTK results now match wxMSW.  The wxMac results
are slightly different but much less obvious than before, so I guess
I can live with that.

Too bad the image.cpp code doesn't mention the platform difference!
And it also divides by 256 rather than 255, as in your macro:

> #define wxPy_premultiply(p, a)   ((p) * (a) / 0xff)

wxAlphaPixelData doesn't seem to appear anywhere in the wx docs.

Andrew