memdraw

type Image struct {
	R     draw.Rectangle /* rectangle in data area, local coords */
	Clipr draw.Rectangle /* clipping region */
	Depth int            /* number of bits of storage per pixel */

	Pix draw.Pix /* channel descriptions */

	Data *_Memdata /* pointer to data; shared by windows in this image */

	Width     uint32 /* width in words of a single scan line */
	Layer     *Layer /* nil if not a layer*/
	Flags     uint32
	X         interface{}
	ScreenRef int /* reference count if this is a screen */
	// contains filtered or unexported fields
}

type Layer struct {
	Screenr draw.Rectangle /* true position of layer on screen */
	Delta   draw.Point     /* add delta to go from image coords to screen */
	Screen  *Screen        /* screen this layer belongs to */

	Refreshfn  Refreshfn   /* function to call to refresh obscured parts if save==nil */
	Refreshptr interface{} /* argument to refreshfn */
	// contains filtered or unexported fields
}

type Refreshfn func(*Image, draw.Rectangle, interface{})

type Screen struct {
	Frontmost *Image /* frontmost layer on screen */
	Rearmost  *Image /* rearmost layer on screen */
	Image     *Image /* upon which all layers are drawn */
	Fill      *Image /* if non-zero, picture to use when repainting */
}