decentral1se
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63 lines
1.5 KiB
Go
63 lines
1.5 KiB
Go
package ansi
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import (
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"bytes"
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"strconv"
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"strings"
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)
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// SixelGraphics returns a sequence that encodes the given sixel image payload to
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// a DCS sixel sequence.
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//
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// DCS p1; p2; p3; q [sixel payload] ST
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//
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// p1 = pixel aspect ratio, deprecated and replaced by pixel metrics in the payload
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//
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// p2 = This is supposed to be 0 for transparency, but terminals don't seem to
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// to use it properly. Value 0 leaves an unsightly black bar on all terminals
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// I've tried and looks correct with value 1.
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//
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// p3 = Horizontal grid size parameter. Everyone ignores this and uses a fixed grid
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// size, as far as I can tell.
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//
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// See https://shuford.invisible-island.net/all_about_sixels.txt
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func SixelGraphics(p1, p2, p3 int, payload []byte) string {
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var buf bytes.Buffer
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buf.WriteString("\x1bP")
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if p1 >= 0 {
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buf.WriteString(strconv.Itoa(p1))
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}
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buf.WriteByte(';')
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if p2 >= 0 {
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buf.WriteString(strconv.Itoa(p2))
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}
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if p3 > 0 {
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buf.WriteByte(';')
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buf.WriteString(strconv.Itoa(p3))
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}
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buf.WriteByte('q')
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buf.Write(payload)
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buf.WriteString("\x1b\\")
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return buf.String()
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}
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// KittyGraphics returns a sequence that encodes the given image in the Kitty
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// graphics protocol.
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//
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// APC G [comma separated options] ; [base64 encoded payload] ST
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//
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// See https://sw.kovidgoyal.net/kitty/graphics-protocol/
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func KittyGraphics(payload []byte, opts ...string) string {
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var buf bytes.Buffer
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buf.WriteString("\x1b_G")
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buf.WriteString(strings.Join(opts, ","))
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if len(payload) > 0 {
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buf.WriteString(";")
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buf.Write(payload)
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}
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buf.WriteString("\x1b\\")
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return buf.String()
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}
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