tiff

cmd/ffwebp/codecs.go

@@ -5,4 +5,5 @@ import (
 	_ "github.com/coalaura/ffwebp/internal/codec/gif"
 	_ "github.com/coalaura/ffwebp/internal/codec/jpeg"
 	_ "github.com/coalaura/ffwebp/internal/codec/png"
+	_ "github.com/coalaura/ffwebp/internal/codec/tiff"
 )

internal/codec/png/png.go

@@ -33,11 +33,11 @@ func (impl) Extensions() []string {
 func (impl) Flags(flags []cli.Flag) []cli.Flag {
 	return append(flags, &cli.IntFlag{
 		Name:        "png.compression",
-		Usage:       "PNG: compression level (0=default, 1=none, 2=speed, 3=best)",
-		Value:       0,
+		Usage:       "PNG: compression level (0=none, 1=default, 2=speed, 3=best)",
+		Value:       1,
 		Destination: &compression,
 		Validator: func(value int) error {
-			if value < 0 || value > 4 {
+			if value < 0 || value > 3 {
 				return fmt.Errorf("invalid compression level: %q", value)
 			}
 
@@ -76,8 +76,10 @@ func (impl) Encode(writer io.Writer, img image.Image, _ opts.Common) error {
 
 func compressionLevel(level int) png.CompressionLevel {
 	switch level {
-	case 1:
+	case 0:
 		return png.NoCompression
+	case 1:
+		return png.DefaultCompression
 	case 2:
 		return png.BestSpeed
 	case 3:

internal/codec/tiff/tiff.go

@@ -0,0 +1,102 @@
+package tiff
+
+import (
+	"bytes"
+	"fmt"
+	"image"
+	"io"
+
+	"golang.org/x/image/tiff"
+
+	"github.com/coalaura/ffwebp/internal/codec"
+	"github.com/coalaura/ffwebp/internal/opts"
+	"github.com/urfave/cli/v3"
+)
+
+var (
+	compression int
+	predictor   bool
+)
+
+func init() {
+	codec.Register(impl{})
+}
+
+type impl struct{}
+
+func (impl) Name() string {
+	return "tiff"
+}
+
+func (impl) Extensions() []string {
+	return []string{"tiff", "tif"}
+}
+
+func (impl) Flags(flags []cli.Flag) []cli.Flag {
+	return append(flags,
+		&cli.IntFlag{
+			Name:        "tiff.compression",
+			Usage:       "TIFF: compression (0=none, 1=deflate, 2=lzw, 3=ccitt3, 4=ccitt4)",
+			Value:       1,
+			Destination: &compression,
+			Validator: func(value int) error {
+				if value < 0 || value > 4 {
+					return fmt.Errorf("invalid compression: %d", value)
+				}
+
+				return nil
+			},
+		},
+		&cli.BoolFlag{
+			Name:        "tiff.predictor",
+			Usage:       "TIFF: enable differencing predictor (improves compression for photos)",
+			Value:       false,
+			Destination: &predictor,
+		},
+	)
+}
+
+func (impl) Sniff(reader io.ReaderAt) (int, error) {
+	magicLE := []byte{0x49, 0x49, 0x2A, 0x00}
+	magicBE := []byte{0x4D, 0x4D, 0x00, 0x2A}
+
+	buf := make([]byte, 4)
+
+	if _, err := reader.ReadAt(buf, 0); err != nil {
+		return 0, err
+	}
+
+	if bytes.Equal(buf, magicLE) || bytes.Equal(buf, magicBE) {
+		return 100, nil
+	}
+
+	return 0, nil
+}
+
+func (impl) Decode(reader io.Reader) (image.Image, error) {
+	return tiff.Decode(reader)
+}
+
+func (impl) Encode(writer io.Writer, img image.Image, options opts.Common) error {
+	return tiff.Encode(writer, img, &tiff.Options{
+		Compression: compressionType(compression),
+		Predictor:   predictor,
+	})
+}
+
+func compressionType(level int) tiff.CompressionType {
+	switch level {
+	case 0:
+		return tiff.Uncompressed
+	case 1:
+		return tiff.Deflate
+	case 2:
+		return tiff.LZW
+	case 3:
+		return tiff.CCITTGroup3
+	case 4:
+		return tiff.CCITTGroup4
+	default:
+		return tiff.Deflate
+	}
+}