GoThrough - package:image/draw

draw.Over

// Over specifies ``(src in mask) over dst''.
const Over = iota

draw.Src

// Src specifies ``src in mask''.
const Src = iota

draw.FloydSteinberg

// FloydSteinberg is a Drawer that is the Src Op with Floyd-Steinberg error
// diffusion.
var FloydSteinberg = floydSteinberg{}

draw.Drawer

// Drawer contains the Draw method.
type Drawer interface {
	// Draw aligns r.Min in dst with sp in src and then replaces the
	// rectangle r in dst with the result of drawing src on dst.
	Draw(dst Image, r image.Rectangle, src image.Image, sp image.Point)
}

draw.Image

// Image is an image.Image with a Set method to change a single pixel.
type Image interface {
	image.Image
	Set(x int, y int, c color.Color)
}

draw.Quantizer

// Quantizer produces a palette for an image.
type Quantizer interface {
	// Quantize appends up to cap(p) - len(p) colors to p and returns the
	// updated palette suitable for converting m to a paletted image.
	Quantize(p color.Palette, m image.Image) color.Palette
}

draw.RGBA64Image

// RGBA64Image extends both the Image and image.RGBA64Image interfaces with a
// SetRGBA64 method to change a single pixel. SetRGBA64 is equivalent to
// calling Set, but it can avoid allocations from converting concrete color
// types to the color.Color interface type.
type RGBA64Image interface {
	image.RGBA64Image
	Set(x int, y int, c color.Color)
	SetRGBA64(x int, y int, c color.RGBA64)
}

draw.Draw

// Draw calls DrawMask with a nil mask.
func Draw(dst Image, r image.Rectangle, src image.Image, sp image.Point, op Op)

draw.DrawMask

// DrawMask aligns r.Min in dst with sp in src and mp in mask and then replaces the rectangle r
// in dst with the result of a Porter-Duff composition. A nil mask is treated as opaque.
func DrawMask(dst Image, r image.Rectangle, src image.Image, sp image.Point, mask image.Image, mp image.Point, op Op)