Of course VSFilter can do this, but the plug-in is still useful to draw shapes directly from the script. Sometimes you just want to make a simple mask with known coordinates (or depending on script parameters) and having just to type a single line is really convenient (well, mt_lutspa often works too but I would not call it “convenient”).
If you want high quality polygon drawing, there is the Anti-Grain Geometry library. It did a good job last time I checked it (it was ~10 years ago), but there are probably other fine libraries around there too.
As improvement, make it work with YUV colorspaces out of the box too.
Last edited by cretindesalpes; 23rd July 2015 at 15:25.
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