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sixel.go
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sixel.go
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package sixel
import (
"bytes"
"context"
"fmt"
"image"
"log/slog"
"strings"
"time"
"golang.org/x/exp/slices"
sixel "github.com/mattn/go-sixel"
"github.com/srlehn/termimg/internal/consts"
"github.com/srlehn/termimg/internal/environ"
"github.com/srlehn/termimg/internal/errors"
"github.com/srlehn/termimg/internal/logx"
"github.com/srlehn/termimg/internal/parser"
"github.com/srlehn/termimg/internal/propkeys"
"github.com/srlehn/termimg/internal/queries"
"github.com/srlehn/termimg/mux"
"github.com/srlehn/termimg/term"
)
func init() { term.RegisterDrawer(&drawerSixel{}) }
var _ term.Drawer = (*drawerSixel)(nil)
type drawerSixel struct{}
func (d *drawerSixel) Name() string { return `sixel` }
func (d *drawerSixel) New() term.Drawer { return &drawerSixel{} }
func (d *drawerSixel) IsApplicable(inp term.DrawerCheckerInput) (bool, environ.Properties) {
// example query: "\033[0c"
// possible answer from the terminal (here xterm): "\033[[?63;1;2;4;6;9;15;22c", vte(?): ...62,9;c
// the "4" signals that the terminal is capable of sixel
// conhost.exe knows this sequence.
if inp == nil {
return false, nil
}
sixelCapable, isSixelCapable := inp.Property(propkeys.SixelCapable)
if !isSixelCapable || sixelCapable != `true` {
return false, nil
}
if slices.Contains([]string{
`domterm`,
`st`,
`tabby`, // no images
`wayst`, // spews character salad
}, inp.Name()) {
return false, nil // skip buggy implementations
}
repl, err := term.CachedQuery(inp, mux.Wrap(queries.DA1, inp), inp, parser.StopOnAlpha, inp, nil)
// TODO fix mintty - querying in general on windows?
if err != nil {
return false, nil
}
if len(repl) == 0 || repl[len(repl)-1] != 'c' {
return false, nil
}
repl = repl[:len(repl)-1]
termCapabilities := strings.Split(repl, `;`)[1:]
for _, cap := range termCapabilities {
if cap == `4` {
return true, nil
}
}
return false, nil
}
func (d *drawerSixel) Draw(img image.Image, bounds image.Rectangle, tm *term.Terminal) error {
drawFn, err := d.Prepare(context.Background(), img, bounds, tm)
if err != nil {
return err
}
return logx.TimeIt(drawFn, `image drawing`, tm, `drawer`, d.Name())
}
func (d *drawerSixel) Prepare(ctx context.Context, img image.Image, bounds image.Rectangle, tm *term.Terminal) (drawFn func() error, _ error) {
if d == nil || tm == nil || img == nil || ctx == nil {
return nil, errors.New(`nil parameter`)
}
start := time.Now()
timg, ok := img.(*term.Image)
if !ok {
timg = term.NewImage(img)
}
if timg == nil {
return nil, errors.New(consts.ErrNilImage)
}
rsz := tm.Resizer()
if rsz == nil {
return nil, errors.New(`nil resizer`)
}
if err := timg.Fit(bounds, rsz, tm); err != nil {
return nil, err
}
sixelString, err := d.inbandString(timg, bounds, tm)
if err != nil {
return nil, err
}
logx.Debug(`image preparation`, tm, `drawer`, d.Name(), `duration`, time.Since(start))
drawFn = func() error {
_, err := tm.WriteString(sixelString)
return logx.Err(err, tm, slog.LevelInfo)
}
return drawFn, nil
}
func (d *drawerSixel) inbandString(timg *term.Image, bounds image.Rectangle, term *term.Terminal) (string, error) {
if timg == nil {
return ``, errors.New(consts.ErrNilImage)
}
sixelString, err := timg.Inband(bounds, d, term)
if err == nil {
return sixelString, nil
}
if err := timg.Decode(); err != nil {
return ``, err
}
if timg.Cropped == nil {
timg.Cropped = timg.Original
}
// sixel
// https://vt100.net/docs/vt3xx-gp/chapter14.html
byteBuf := new(bytes.Buffer)
enc := sixel.NewEncoder(byteBuf)
enc.Dither = true
if err := enc.Encode(timg.Cropped); err != nil {
return ``, err
}
sixelString = mux.Wrap("\033[?8452h"+byteBuf.String(), term)
// position where the image should appear (upper left corner) + sixel
// https://github.com/mintty/mintty/wiki/CtrlSeqs#sixel-graphics-end-position
// "\033[?8452h" sets the cursor next right to the bottom of the image instead of below
// this prevents vertical scrolling when the image fills the last line.
// horizontal scrolling because of this did not happen in my test cases.
// "\033[?80l" disables sixel scrolling if it isn't already.
//img.inband[term.Name()] = fmt.Sprintf("\033[%d;%dH%s", bounds.Min.Y+1, bounds.Min.X+1, sixelString)
sixelString = fmt.Sprintf("\033[%d;%dH%s", bounds.Min.Y+1, bounds.Min.X+1, sixelString)
// timg.SetInband(bounds, sixelString, d, term) // TODO uncomment
// test string "HI"
// wdgt.Block.ANSIString = fmt.Sprintf("\033[%d;%dH\033[?8452h%s", wdgt.Inner.Min.Y+1, wdgt.Inner.Min.X+1, "\033Pq#0;2;0;0;0#1;2;100;100;0#2;2;0;100;0#1~~@@vv@@~~@@~~$#2??}}GG}}??}}??-#1!14@\033\\")
timg.SetInband(bounds, sixelString, d, term)
return sixelString, nil
}