draw2dimg/ftgc.go
func (gc *GraphicContext) DrawImage(img image.Image) {
	DrawImage(img, gc.img, gc.Current.Tr, draw.Over, BilinearFilter)
}
func (gc *GraphicContext) DrawImage(img image.Image) {
	DrawImage(img, gc.img, gc.Current.Tr, draw.Over, BilinearFilter)
}
// DrawImage draws the raster image in the current canvas