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[STR New]

Link: http://www.fltk.org/str.php?L1874
Version: 1.1-current


There are some inconsistencies in the offscreen code I would while trying
to debug fl_draw_pixmap.

fl_create_offscreen_with_alpha is mentioned in the documentation, but it's
not present in any public header for any platform. Since it's supported for
win32 and quartz, it should be added there. For platform with no alpha
support, the function can easily return some error.

There's some hand-declaration in Fl_Double_Window that should be clean up
too.

fl_copy_offscreen_with_alpha follows the same logic. Since there's no
return value here, a simple return is enough. fl_can_do_alpha_blending can
be used to check if both function work or not.


Link: http://www.fltk.org/str.php?L1874
Version: 1.1-current

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