696: move vertex module to LayoutFarm.Drawing
697: merge WinGdi to LayoutFarm.Platforms.Drawing
699: DrawImage
699.1: temp fix Agg.ArrayList
702: GraphicsPath
703: DrawText
705: GLGradientColorProvider
707: Basic openGL 's stencil sample
708: DrawSample06_GradientBrush
714: please focus on FillPolygon

we use Agg to create Alpha channel then use Blend Functions to d\Draw
an AA polygon!
715: DrawSample07_PolygonStencil

like Linear gradient fill
718: DrawSample08_DrawText2

test render gdi font on bmp and then copy to GL texture
plan: implement texture atlas
719: LazyBitmapBufferProvider and TextureAtlas

not complete Texture Atlas
725: Canvas.DrawImage , GLBitmapReference
726: 03_SimpleDraw3
727: GdiTextBoard

basic , simple bitmap glyph, no kerning support.
728: GdiTextBoard with transparent bg
729: polygon fill
731: GdiTextBoard, Clear with White Bg first

Windows Font sub pixel rendering will take effect
734: FontABC