fix font decorate position, thickness issue (#1619)
fix font decorate position, thickness issue (#1619)

* WIP: add line stroke color info for DrawPolygonPrimitive's condition

* WIP: fix an inaccurate underline formula

* WIP: add to follow stroke color when they're given

Danack/ImageMagick,Danack/ImageMagick,Danack/ImageMagick,Danack/ImageMagick,Danack/ImageMagick,Danack/ImageMagick