package image
Gray is an in-memory image whose At method returns color.Gray values.
Golang image.Gray and Gray16 types usage examples
Example 1:
func NewSurfaceFromImage(img image.Image) *Surface {
var format Format
switch img.(type) {
case *image.Alpha, *image.Alpha16:
format = FORMAT_A8
case *extimage.BGRN, *image.Gray, *image.Gray16, *image.YCbCr:
format = FORMAT_RGB24
default:
format = FORMAT_ARGB32
}
surface := NewSurface(format, img.Bounds().Dx(), img.Bounds().Dy())
surface.SetImage(img)
return surface
}
Example 2:
if img, ok := src.(*image.Gray); ok {
return img.SubImage(rect)
}
References :
https://github.com/ungerik/go-cairo/blob/master/surface.go
http://golang.org/pkg/image/#Gray
http://golang.org/pkg/image/#Gray16
