From 6c75477d4267b449652c0f05602824b9a105caf0 Mon Sep 17 00:00:00 2001
From: Laura <laura@wiese2.org>
Date: Mon, 11 Aug 2025 02:55:07 +0200
Subject: [PATCH] jpegxl

---
 go.mod                          |  1 +
 go.sum                          |  2 +
 internal/builtins/jpegxl.go     |  8 +++
 internal/codec/jpegxl/jpegxl.go | 91 +++++++++++++++++++++++++++++++++
 4 files changed, 102 insertions(+)
 create mode 100644 internal/builtins/jpegxl.go
 create mode 100644 internal/codec/jpegxl/jpegxl.go

diff --git a/go.mod b/go.mod
index ade2632..c6d878b 100644
--- a/go.mod
+++ b/go.mod
@@ -6,6 +6,7 @@ require github.com/urfave/cli/v3 v3.3.8
 
 require (
 	github.com/gen2brain/avif v0.4.4
+	github.com/gen2brain/jpegxl v0.4.5
 	github.com/gen2brain/webp v0.5.5
 	github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646
 	golang.org/x/image v0.0.0-20191009234506-e7c1f5e7dbb8
diff --git a/go.sum b/go.sum
index e182d1b..32f245f 100644
--- a/go.sum
+++ b/go.sum
@@ -4,6 +4,8 @@ github.com/ebitengine/purego v0.8.3 h1:K+0AjQp63JEZTEMZiwsI9g0+hAMNohwUOtY0RPGex
 github.com/ebitengine/purego v0.8.3/go.mod h1:iIjxzd6CiRiOG0UyXP+V1+jWqUXVjPKLAI0mRfJZTmQ=
 github.com/gen2brain/avif v0.4.4 h1:Ga/ss7qcWWQm2bxFpnjYjhJsNfZrWs5RsyklgFjKRSE=
 github.com/gen2brain/avif v0.4.4/go.mod h1:/XCaJcjZraQwKVhpu9aEd9aLOssYOawLvhMBtmHVGqk=
+github.com/gen2brain/jpegxl v0.4.5 h1:TWpVEn5xkIfsswzkjHBArd0Cc9AE0tbjBSoa0jDsrbo=
+github.com/gen2brain/jpegxl v0.4.5/go.mod h1:4kWYJ18xCEuO2vzocYdGpeqNJ990/Gjy3uLMg5TBN6I=
 github.com/gen2brain/webp v0.5.5 h1:MvQR75yIPU/9nSqYT5h13k4URaJK3gf9tgz/ksRbyEg=
 github.com/gen2brain/webp v0.5.5/go.mod h1:xOSMzp4aROt2KFW++9qcK/RBTOVC2S9tJG66ip/9Oc0=
 github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646 h1:zYyBkD/k9seD2A7fsi6Oo2LfFZAehjjQMERAvZLEDnQ=
diff --git a/internal/builtins/jpegxl.go b/internal/builtins/jpegxl.go
new file mode 100644
index 0000000..feacdab
--- /dev/null
+++ b/internal/builtins/jpegxl.go
@@ -0,0 +1,8 @@
+//go:build jpegxl || full
+// +build jpegxl full
+
+package builtins
+
+import (
+	_ "github.com/coalaura/ffwebp/internal/codec/jpegxl"
+)
diff --git a/internal/codec/jpegxl/jpegxl.go b/internal/codec/jpegxl/jpegxl.go
new file mode 100644
index 0000000..911a311
--- /dev/null
+++ b/internal/codec/jpegxl/jpegxl.go
@@ -0,0 +1,91 @@
+package jpegxl
+
+import (
+	"bytes"
+	"fmt"
+	"image"
+	"io"
+
+	jxl "github.com/gen2brain/jpegxl"
+
+	"github.com/coalaura/ffwebp/internal/codec"
+	"github.com/coalaura/ffwebp/internal/logx"
+	"github.com/coalaura/ffwebp/internal/opts"
+	"github.com/urfave/cli/v3"
+)
+
+var (
+	effort int
+)
+
+func init() {
+	codec.Register(impl{})
+}
+
+type impl struct{}
+
+func (impl) String() string {
+	return "jpegxl"
+}
+
+func (impl) Extensions() []string {
+	return []string{"jxl"}
+}
+
+func (impl) Flags(flags []cli.Flag) []cli.Flag {
+	return append(flags,
+		&cli.IntFlag{
+			Name:        "jpegxl.effort",
+			Usage:       "JPEG XL: encode effort (1=fast .. 10=slow). Default 7",
+			Value:       7,
+			Destination: &effort,
+			Validator: func(value int) error {
+				if value < 1 || value > 10 {
+					return fmt.Errorf("invalid jpegxl.effort: %d", value)
+				}
+				return nil
+			},
+		},
+	)
+}
+
+func (impl) Sniff(reader io.ReaderAt) (int, []byte, error) {
+	containerMagic := []byte{
+		0x00, 0x00, 0x00, 0x0C,
+		'j', 'x', 'l', ' ',
+		0x0D, 0x0A, 0x87, 0x0A,
+	}
+
+	buf := make([]byte, 12)
+
+	if _, err := reader.ReadAt(buf, 0); err != nil {
+		if err == io.EOF {
+			return 0, nil, nil
+		}
+
+		return 0, nil, err
+	}
+
+	if bytes.Equal(buf, containerMagic) {
+		return 100, containerMagic, nil
+	}
+
+	if buf[0] == 0xFF && buf[1] == 0x0A {
+		return 100, buf[:2], nil
+	}
+
+	return 0, nil, nil
+}
+
+func (impl) Decode(reader io.Reader) (image.Image, error) {
+	return jxl.Decode(reader)
+}
+
+func (impl) Encode(writer io.Writer, img image.Image, options opts.Common) error {
+	logx.Printf("jpegxl: quality=%d effort=%d\n", options.Quality, effort)
+
+	return jxl.Encode(writer, img, jxl.Options{
+		Quality: options.Quality,
+		Effort:  effort,
+	})
+}