You can almost see me

Posted by ALB42 on 7. Mai 2016No Comments

As promised, I cared about drawing with alpha channel on m68k Amiga. Little bit background. When I make a StretchDraw() the raw data is scaled directly in pascal (to keep the alpha channel) via a nearest neighbor routine. And exactly there I need to touch every pixel to scale it, of course a good position to also care about the alpha channel. For speed optimization the special cases 0 and 255 alpha channel are handled separately. And its not so slow as I thought, so I let it inside.
 

Amiga m68k with alpha channel drawing (left) and as comparison on AmigaOS4 (right)

Amiga m68k with alpha channel drawing (left) and as comparison on AmigaOS4 (right)


 
Besides this I worked more on size calculations especially on MorphOS, still not completely sure how it should be. An additional problem appeared in the OS4 LCL. The size calculation as done before crashes, because it reads the Width/Height from the the MUI object which seems to be forbidden inside the Layout. If think about it’s not very surprising because the layout is called before the window is opened and to get the right size the Layout must be done. So I had to rewrite the section with AROS in mind of course. Seems it works now (again? I hope). With this changes the EdiSyn now also work on OS4.
 
EdiSyn on AmigaOS4

EdiSyn on AmigaOS4

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