1package clib
 2
 3import (
 4	"bytes"
 5	"image/png"
 6
 7	"github.com/mattn/go-sixel"
 8)
 9
10// EncodePNGToSixel converts PNG bytes to Sixel format
11// Returns Sixel sequence and row count needed for terminal spacing
12func EncodePNGToSixel(pngData []byte, cellHeightPx int) (string, int, error) {
13	// Decode PNG
14	img, err := png.Decode(bytes.NewReader(pngData))
15	if err != nil {
16		return "", 0, err
17	}
18
19	// Encode to Sixel
20	var buf bytes.Buffer
21	enc := sixel.NewEncoder(&buf)
22	if err := enc.Encode(img); err != nil {
23		return "", 0, err
24	}
25
26	// Calculate rows: image height / cell height
27	bounds := img.Bounds()
28	rows := (bounds.Dy() + cellHeightPx - 1) / cellHeightPx
29
30	return buf.String(), rows, nil
31}