Please vote about having the Windows FLTK platform draw oblique lines,

curves and all complex shapes in antialiased form. The result of this change is

visible in the attached snapshot where left elements show the current products

and right elements show the effect of the proposed changes, both under Windows 10.

The code for that is in branch GDI+soft of https://github.com/ManoloFLTK/fltk

That code uses GDI+ only when it improves the quality of current drawings,

that is, when drawing non horizontal nor vertical lines or when drawing curves.
All the rest (e.g., text, images, horizontal and vertical lines, rectangles) are

processed unchanged by GDI.

As Ian has reported, drawing with GDI+ is slightly slower than with GDI. This is visible

with the test/doublebuffer program which takes a short but perceivable time

to complete redrawing with its highest number of oblique lines that are drawn with GDI+

in the new code. Notice that line #37 of test/doublebuffer.cxx reads :

    // this purposely draws each line 10 times to be slow:

Therefore, It takes an unrealistic number of GDI+ operations for the slowing to be visible.

GDI+ is supported from Windows XP and up. When GDI+ isn't available, the modified

code falls back to GDI. Thus FLTK remains compatible with Windows 95.

Both configure-based and CMake-based builds are taken care of.

My vote is +1

TIA - Manolo