mirror of
https://github.com/tenox7/wrp.git
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90 lines
2.6 KiB
Go
90 lines
2.6 KiB
Go
// wrp utility functions
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package main
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import (
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"image"
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"image/color/palette"
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"log"
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"net"
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"strings"
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"github.com/MaxHalford/halfgone"
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"github.com/soniakeys/quant/median"
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)
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func printMyIPs(b string) {
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ap := strings.Split(b, ":")
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if len(ap) < 1 {
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log.Fatal("Wrong format of ipaddress:port")
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}
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log.Printf("Listen address: %v", b)
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if ap[0] != "" && ap[0] != "0.0.0.0" {
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return
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}
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a, err := net.InterfaceAddrs()
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if err != nil {
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log.Print("Unable to get interfaces: ", err)
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return
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}
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var m string
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for _, i := range a {
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n, ok := i.(*net.IPNet)
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if !ok || n.IP.IsLoopback() || strings.Contains(n.IP.String(), ":") {
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continue
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}
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m = m + n.IP.String() + " "
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}
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log.Print("My IP addresses: ", m)
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}
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func gifPalette(i image.Image, n int64) image.Image {
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switch n {
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case 2:
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i = halfgone.FloydSteinbergDitherer{}.Apply(halfgone.ImageToGray(i))
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case 216:
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var FastGifLut = [256]int{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5}
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r := i.Bounds()
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// NOTE: the color index computation below works only for palette.WebSafe!
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p := image.NewPaletted(r, palette.WebSafe)
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if i64, ok := i.(image.RGBA64Image); ok {
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for y := r.Min.Y; y < r.Max.Y; y++ {
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for x := r.Min.X; x < r.Max.X; x++ {
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c := i64.RGBA64At(x, y)
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r6 := FastGifLut[c.R>>8]
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g6 := FastGifLut[c.G>>8]
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b6 := FastGifLut[c.B>>8]
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p.SetColorIndex(x, y, uint8(36*r6+6*g6+b6))
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}
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}
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} else {
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for y := r.Min.Y; y < r.Max.Y; y++ {
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for x := r.Min.X; x < r.Max.X; x++ {
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c := i.At(x, y)
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r, g, b, _ := c.RGBA()
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r6 := FastGifLut[r&0xff]
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g6 := FastGifLut[g&0xff]
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b6 := FastGifLut[b&0xff]
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p.SetColorIndex(x, y, uint8(36*r6+6*g6+b6))
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}
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}
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}
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i = p
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default:
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q := median.Quantizer(n)
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i = q.Paletted(i)
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}
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return i
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}
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func asciify(s []byte) []byte {
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a := make([]byte, len(s))
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for i := 0; i < len(s); i++ {
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if s[i] > 127 {
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a[i] = '.'
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continue
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}
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a[i] = s[i]
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}
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return a
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}
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