@@ -23,7 +23,6 @@ "database/sql"
 	"encoding/json"
 	"fmt"
 	"html"
-	"image"
 	"io"
 	"log"
 	"net/http"
@@ -33,6 +32,8 @@ "strconv"
 	"strings"
 	"sync"
 	"time"
+
+	"humungus.tedunangst.com/r/webs/image"
 )
 
 func NewJunk() map[string]interface{} {
@@ -222,13 +223,13 @@ xid := xfiltrate()
 
 	data := buf.Bytes()
 	if strings.HasPrefix(media, "image") {
-		img, format, err := image.Decode(&buf)
+		img, err := image.Vacuum(&buf)
 		if err != nil {
 			log.Printf("unable to decode image: %s", err)
 			return nil
 		}
-		data, format, err = vacuumwrap(img, format)
-		media = "image/" + format
+		data = img.Data
+		media = "image/" + img.Format
 	}
 	res, err := stmtSaveFile.Exec(xid, name, url, media, data)
 	if err != nil {

@@ -6,5 +6,5 @@ github.com/mattn/go-runewidth v0.0.4
 	golang.org/x/crypto v0.0.0-20190424203555-c05e17bb3b2d
 	golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3
 	humungus.tedunangst.com/r/go-sqlite3 v1.1.2
-	humungus.tedunangst.com/r/webs v0.2.0
+	humungus.tedunangst.com/r/webs v0.3.0
 )

@@ -12,5 +12,5 @@ golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 humungus.tedunangst.com/r/go-sqlite3 v1.1.2 h1:bRAXNRZ4VNFRFhhG4tdudK4Lv4ktHQAHEppKlDANUFg=
 humungus.tedunangst.com/r/go-sqlite3 v1.1.2/go.mod h1:FtEEmQM7U2Ey1TuEEOyY1BmphTZnmiEjPsNLEAkpf/M=
-humungus.tedunangst.com/r/webs v0.2.0 h1:K0PJK4ZFNB+B0vGbs6huY5br35Z9xR4T6XpcFHmwXgQ=
-humungus.tedunangst.com/r/webs v0.2.0/go.mod h1:6yLLDXBaE4pKURa/3/bxoQPod37uAqc/Kq8J0IopWW0=
+humungus.tedunangst.com/r/webs v0.3.0 h1:Igx471E1Rabh5BIkVJw9N48xGNEHENx05r/7lOBJRUs=
+humungus.tedunangst.com/r/webs v0.3.0/go.mod h1:6yLLDXBaE4pKURa/3/bxoQPod37uAqc/Kq8J0IopWW0=

@@ -23,7 +23,6 @@ "database/sql"
 	"fmt"
 	"html"
 	"html/template"
-	"image"
 	"io"
 	"log"
 	notrand "math/rand"
@@ -36,6 +35,7 @@ "sync"
 	"time"
 
 	"github.com/gorilla/mux"
+	"humungus.tedunangst.com/r/webs/image"
 	"humungus.tedunangst.com/r/webs/login"
 	"humungus.tedunangst.com/r/webs/templates"
 )
@@ -883,13 +883,10 @@ file.Close()
 		data := buf.Bytes()
 		xid := xfiltrate()
 		var media, name string
-		img, format, err := image.Decode(&buf)
+		img, err := image.Vacuum(&buf)
 		if err == nil {
-			data, format, err = vacuumwrap(img, format)
-			if err != nil {
-				log.Printf("can't vacuum image: %s", err)
-				return
-			}
+			data = img.Data
+			format := img.Format
 			media = "image/" + format
 			if format == "jpeg" {
 				format = "jpg"

@@ -1,148 +0,0 @@
-//
-// Copyright (c) 2019 Ted Unangst <tedu@tedunangst.com>
-//
-// Permission to use, copy, modify, and distribute this software for any
-// purpose with or without fee is hereby granted, provided that the above
-// copyright notice and this permission notice appear in all copies.
-//
-// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-
-package main
-
-import (
-	"bytes"
-	"fmt"
-	"image"
-	"image/jpeg"
-	"image/png"
-	"math"
-)
-
-func lineate(s uint8) float64 {
-	x := float64(s)
-	x /= 255.0
-	if x < 0.04045 {
-		x /= 12.92
-	} else {
-		x += 0.055
-		x /= 1.055
-		x = math.Pow(x, 2.4)
-	}
-	return x
-}
-
-func delineate(x float64) uint8 {
-	if x > 0.0031308 {
-		x = math.Pow(x, 1/2.4)
-		x *= 1.055
-		x -= 0.055
-	} else {
-		x *= 12.92
-	}
-	x *= 255.0
-	return uint8(x)
-}
-
-func blend(d []byte, s1, s2, s3, s4 int) byte {
-	l1 := lineate(d[s1])
-	l2 := lineate(d[s2])
-	l3 := lineate(d[s3])
-	l4 := lineate(d[s4])
-	return delineate((l1 + l2 + l3 + l4) / 4.0)
-}
-
-func squish(d []byte, s1, s2, s3, s4 int) byte {
-	return uint8((uint32(d[s1]) + uint32(d[s2]) + uint32(d[s3]) + uint32(d[s4])) / 4)
-}
-
-func vacuumwrap(img image.Image, format string) ([]byte, string, error) {
-	maxdimension := 2048
-	for img.Bounds().Max.X > maxdimension || img.Bounds().Max.Y > maxdimension {
-		switch oldimg := img.(type) {
-		case *image.NRGBA:
-			w, h := oldimg.Rect.Max.X/2, oldimg.Rect.Max.Y/2
-			newimg := image.NewNRGBA(image.Rectangle{Max: image.Point{X: w, Y: h}})
-			for j := 0; j < h; j++ {
-				for i := 0; i < w; i++ {
-					p := newimg.Stride*j + i*4
-					q1 := oldimg.Stride*(j*2+0) + i*4*2
-					q2 := oldimg.Stride*(j*2+1) + i*4*2
-					newimg.Pix[p+0] = blend(oldimg.Pix, q1+0, q1+4, q2+0, q2+4)
-					newimg.Pix[p+1] = blend(oldimg.Pix, q1+1, q1+5, q2+1, q2+5)
-					newimg.Pix[p+2] = blend(oldimg.Pix, q1+2, q1+6, q2+2, q2+6)
-					newimg.Pix[p+3] = squish(oldimg.Pix, q1+3, q1+7, q2+3, q2+7)
-				}
-			}
-			img = newimg
-		case *image.YCbCr:
-			w, h := oldimg.Rect.Max.X/2, oldimg.Rect.Max.Y/2
-			newimg := image.NewYCbCr(image.Rectangle{Max: image.Point{X: w, Y: h}},
-				oldimg.SubsampleRatio)
-			for j := 0; j < h; j++ {
-				for i := 0; i < w; i++ {
-					p := newimg.YStride*j + i
-					q1 := oldimg.YStride*(j*2+0) + i*2
-					q2 := oldimg.YStride*(j*2+1) + i*2
-					newimg.Y[p+0] = blend(oldimg.Y, q1+0, q1+1, q2+0, q2+1)
-				}
-			}
-			switch newimg.SubsampleRatio {
-			case image.YCbCrSubsampleRatio444:
-				w, h = w, h
-			case image.YCbCrSubsampleRatio422:
-				w, h = w/2, h
-			case image.YCbCrSubsampleRatio420:
-				w, h = w/2, h/2
-			case image.YCbCrSubsampleRatio440:
-				w, h = w, h/2
-			case image.YCbCrSubsampleRatio411:
-				w, h = w/4, h
-			case image.YCbCrSubsampleRatio410:
-				w, h = w/4, h/2
-			}
-			for j := 0; j < h; j++ {
-				for i := 0; i < w; i++ {
-					p := newimg.CStride*j + i
-					q1 := oldimg.CStride*(j*2+0) + i*2
-					q2 := oldimg.CStride*(j*2+1) + i*2
-					newimg.Cb[p+0] = blend(oldimg.Cb, q1+0, q1+1, q2+0, q2+1)
-					newimg.Cr[p+0] = blend(oldimg.Cr, q1+0, q1+1, q2+0, q2+1)
-				}
-			}
-			img = newimg
-		default:
-			return nil, "", fmt.Errorf("can't support image format")
-		}
-	}
-	maxsize := 512 * 1024
-	quality := 80
-	var buf bytes.Buffer
-	for {
-		switch format {
-		case "png":
-			png.Encode(&buf, img)
-		case "jpeg":
-			jpeg.Encode(&buf, img, &jpeg.Options{Quality: quality})
-		default:
-			return nil, "", fmt.Errorf("can't encode format: %s", format)
-		}
-		if buf.Len() > maxsize && quality > 30 {
-			switch format {
-			case "png":
-				format = "jpeg"
-			case "jpeg":
-				quality -= 10
-			}
-			buf.Reset()
-			continue
-		}
-		break
-	}
-	return buf.Bytes(), format, nil
-}