Add basic unanimated webp encoding and decoding support

cmd/helpers.go

@@ -15,6 +15,7 @@ import (
 var jpgExtensions = []string{".jpg", ".jpeg"}
 var pngExtensions = []string{".png"}
 var bmpExtensions = []string{".bmp"}
+var webpExtensions = []string{".webp"}
 
 var (
 	// ErrWrongSize is thrown when the provided size string does not match the expected form.
@@ -51,6 +52,12 @@ func resolveEncoder(outputfile string, defaultEncoding imgio.Encoder) imgio.Enco
 		}
 	}
 
+	for _, ext := range webpExtensions {
+		if strings.HasSuffix(lower, ext) {
+			return imgio.WEBPEncoder(nil)
+		}
+	}
+
 	return defaultEncoding
 }
 

go.mod

@@ -3,6 +3,7 @@ module github.com/anthonynsimon/bild
 go 1.26
 
 require (
+	github.com/HugoSmits86/nativewebp v1.3.0
 	github.com/spf13/cobra v1.10.2
 	golang.org/x/image v0.38.0
 )

go.sum

@@ -1,3 +1,5 @@
+github.com/HugoSmits86/nativewebp v1.3.0 h1:n1egtEzSV4KwFtealr7dzdYq1wI/uj/bOQ/QcTcIyVE=
+github.com/HugoSmits86/nativewebp v1.3.0/go.mod h1:YNQuWenlVmSUUASVNhTDwf4d7FwYQGbGhklC8p72Vr8=
 github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
 github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
 github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=

imgio/io.go

@@ -8,6 +8,7 @@ import (
 	"io"
 	"os"
 
+	"github.com/HugoSmits86/nativewebp"
 	"golang.org/x/image/bmp"
 )
 
@@ -57,6 +58,13 @@ func BMPEncoder() Encoder {
 	}
 }
 
+// WEBPEncoder returns an encoder to WEBP
+func WEBPEncoder(o *nativewebp.Options) Encoder {
+	return func(w io.Writer, img image.Image) error {
+		return nativewebp.Encode(w, img, o)
+	}
+}
+
 // Save creates a file and writes to it an image using the provided encoder.
 //
 // Usage example:

imgio/io_test.go

@@ -52,6 +52,19 @@ func TestEncode(t *testing.T) {
 				},
 			},
 		},
+		{
+			format:  "webp",
+			encoder: WEBPEncoder(nil),
+			value: &image.RGBA{
+				Rect:   image.Rect(0, 0, 3, 3),
+				Stride: 3 * 4,
+				Pix: []uint8{
+					0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF,
+					0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0x80, 0x00, 0x00, 0xFF,
+					0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0x00, 0x00, 0xFF,
+				},
+			},
+		},
 	}
 
 	for _, c := range cases {