From 4a09c9b803fdcfb2f5669a986c880c4e440a3d41 Mon Sep 17 00:00:00 2001
From: Milan Nikolic <gen2brain@gmail.com>
Date: Fri, 13 Jun 2025 17:01:56 +0200
Subject: [PATCH] Change libjpeg library, rename tag

---
 README.md                                   | 24 +++++----------------
 image/decode.go                             |  6 ++----
 image/{decode_jpeg.go => decode_libjpeg.go} | 12 +++++++----
 image/encode.go                             |  6 ++----
 image/{encode_jpeg.go => encode_libjpeg.go} | 15 ++++++-------
 5 files changed, 23 insertions(+), 40 deletions(-)
 rename image/{decode_jpeg.go => decode_libjpeg.go} (58%)
 rename image/{encode_jpeg.go => encode_libjpeg.go} (66%)

diff --git a/README.md b/README.md
index 687d5cf..0d8e2c6 100644
--- a/README.md
+++ b/README.md
@@ -21,32 +21,18 @@ You can also use apps like `ffplay` or `vlc`:
 
 ### Build tags
 
-* `opencv` - use `OpenCV` to access camera ([gocv](https://github.com/hybridgroup/gocv))
-* `turbo` - build with `libjpeg-turbo` ([libjpeg-turbo](https://www.libjpeg-turbo.org/)) instead of native Go `image/jpeg`
+* `opencv` - use `OpenCV` library to access camera ([gocv](https://github.com/hybridgroup/gocv))
+* `libjpeg` - build with `libjpeg` ([go-libjpeg](https://github.com/pixiv/go-libjpeg)) instead of native Go `image/jpeg`
 
 ### Download
 
-Binaries are compiled with static OpenCV/libjpeg-turbo libraries, they should just work:
-
- - [Linux 64bit](https://github.com/gen2brain/cam2ip/releases/download/1.6/cam2ip-1.6-64bit.tar.gz)
- - [Linux 64bit OpenCV](https://github.com/gen2brain/cam2ip/releases/download/1.6/cam2ip-1.6-64bit-cv2.tar.gz)
- - [macOS 64bit OpenCV](https://github.com/gen2brain/cam2ip/releases/download/1.6/cam2ip-1.6-darwin-cv2.zip)
- - [RPi 32bit](https://github.com/gen2brain/cam2ip/releases/download/1.6/cam2ip-1.6-RPi.tar.gz)
- - [RPi 32bit OpenCV](https://github.com/gen2brain/cam2ip/releases/download/1.6/cam2ip-1.6-RPi-cv2.tar.gz)
- - [RPi 32bit Static](https://github.com/gen2brain/cam2ip/releases/download/1.6/cam2ip-1.6-RPi-nocgo.tar.gz)
- - [RPi3 32bit](https://github.com/gen2brain/cam2ip/releases/download/1.6/cam2ip-1.6-RPi3.tar.gz)
- - [RPi3 32bit OpenCV](https://github.com/gen2brain/cam2ip/releases/download/1.6/cam2ip-1.6-RPi3-cv2.tar.gz)
- - [Windows 32bit](https://github.com/gen2brain/cam2ip/releases/download/1.6/cam2ip-1.6-32bit.zip)
- - [Windows 32bit OpenCV](https://github.com/gen2brain/cam2ip/releases/download/1.6/cam2ip-1.6-32bit-cv2.zip)
- - [Windows 64bit](https://github.com/gen2brain/cam2ip/releases/download/1.6/cam2ip-1.6-64bit.zip)
- - [Windows 64bit OpenCV](https://github.com/gen2brain/cam2ip/releases/download/1.6/cam2ip-1.6-64bit-cv2.zip)
-
+Download the latest binaries from the [releases](https://github.com/gen2brain/cam2ip/releases).
 
 ### Installation
 
-    go get -v github.com/gen2brain/cam2ip/cmd/cam2ip
+    go install github.com/gen2brain/cam2ip/cmd/cam2ip@latest
 
-This will install app in `$GOPATH/bin/cam2ip`.
+This command will install `cam2ip` in `GOBIN`, you can point `GOBIN` to e.g. `/usr/local/bin` or `~/.local/bin`.
 
 ### Run in Docker container
 
diff --git a/image/decode.go b/image/decode.go
index a63a063..bcc2723 100644
--- a/image/decode.go
+++ b/image/decode.go
@@ -1,14 +1,12 @@
-//go:build turbo
-// +build turbo
+//go:build !libjpeg
 
 // Package image.
 package image
 
 import (
 	"image"
+	"image/jpeg"
 	"io"
-
-	jpeg "github.com/antonini/golibjpegturbo"
 )
 
 // NewDecoder returns a new Decoder.
diff --git a/image/decode_jpeg.go b/image/decode_libjpeg.go
similarity index 58%
rename from image/decode_jpeg.go
rename to image/decode_libjpeg.go
index 1f1d6c9..031a6c7 100644
--- a/image/decode_jpeg.go
+++ b/image/decode_libjpeg.go
@@ -1,13 +1,13 @@
-//go:build !turbo
-// +build !turbo
+//go:build libjpeg
 
 // Package image.
 package image
 
 import (
 	"image"
-	"image/jpeg"
 	"io"
+
+	"github.com/pixiv/go-libjpeg/jpeg"
 )
 
 // NewDecoder returns a new Decoder.
@@ -22,5 +22,9 @@ type Decoder struct {
 
 // Decode decodes image from JPEG.
 func (d Decoder) Decode() (image.Image, error) {
-	return jpeg.Decode(d.r)
+	return jpeg.Decode(d.r, &jpeg.DecoderOptions{
+		DCTMethod:              jpeg.DCTFloat,
+		DisableFancyUpsampling: true,
+		DisableBlockSmoothing:  true,
+	})
 }
diff --git a/image/encode.go b/image/encode.go
index 42a35fd..ed9dd19 100644
--- a/image/encode.go
+++ b/image/encode.go
@@ -1,14 +1,12 @@
-//go:build turbo
-// +build turbo
+//go:build !libjpeg
 
 // Package image.
 package image
 
 import (
 	"image"
+	"image/jpeg"
 	"io"
-
-	jpeg "github.com/antonini/golibjpegturbo"
 )
 
 // NewEncoder returns a new Encoder.
diff --git a/image/encode_jpeg.go b/image/encode_libjpeg.go
similarity index 66%
rename from image/encode_jpeg.go
rename to image/encode_libjpeg.go
index b7755a9..1fa26c7 100644
--- a/image/encode_jpeg.go
+++ b/image/encode_libjpeg.go
@@ -1,13 +1,13 @@
-//go:build !turbo
-// +build !turbo
+//go:build libjpeg
 
 // Package image.
 package image
 
 import (
 	"image"
-	"image/jpeg"
 	"io"
+
+	"github.com/pixiv/go-libjpeg/jpeg"
 )
 
 // NewEncoder returns a new Encoder.
@@ -22,10 +22,7 @@ type Encoder struct {
 
 // Encode encodes image to JPEG.
 func (e Encoder) Encode(img image.Image) error {
-	err := jpeg.Encode(e.w, img, &jpeg.Options{Quality: 75})
-	if err != nil {
-		return err
-	}
-
-	return nil
+	return jpeg.Encode(e.w, img, &jpeg.EncoderOptions{
+		Quality: 75,
+	})
 }