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package ansi
import (
"bytes"
"strconv"
"strings"
)
// SixelGraphics returns a sequence that encodes the given sixel image payload to
// a DCS sixel sequence.
//
// DCS p1; p2; p3; q [sixel payload] ST
//
// p1 = pixel aspect ratio, deprecated and replaced by pixel metrics in the payload
//
// p2 = This is supposed to be 0 for transparency, but terminals don't seem to
// to use it properly. Value 0 leaves an unsightly black bar on all terminals
// I've tried and looks correct with value 1.
//
// p3 = Horizontal grid size parameter. Everyone ignores this and uses a fixed grid
// size, as far as I can tell.
//
// See https://shuford.invisible-island.net/all_about_sixels.txt
func SixelGraphics(p1, p2, p3 int, payload []byte) string {
var buf bytes.Buffer
buf.WriteString("\x1bP")
if p1 >= 0 {
buf.WriteString(strconv.Itoa(p1))
}
buf.WriteByte(';')
if p2 >= 0 {
buf.WriteString(strconv.Itoa(p2))
}
if p3 > 0 {
buf.WriteByte(';')
buf.WriteString(strconv.Itoa(p3))
}
buf.WriteByte('q')
buf.Write(payload)
buf.WriteString("\x1b\\")
return buf.String()
}
// KittyGraphics returns a sequence that encodes the given image in the Kitty
// graphics protocol.
//
// APC G [comma separated options] ; [base64 encoded payload] ST
//
// See https://sw.kovidgoyal.net/kitty/graphics-protocol/
func KittyGraphics(payload []byte, opts ...string) string {
var buf bytes.Buffer
buf.WriteString("\x1b_G")
buf.WriteString(strings.Join(opts, ","))
if len(payload) > 0 {
buf.WriteString(";")
buf.Write(payload)
}
buf.WriteString("\x1b\\")
return buf.String()
}
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