func thumbnailHandler() http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
filename, err := url.QueryUnescape(r.URL.String())
checkErr(err)
fmt.Println("handling request for", filename)
file, err := os.Open(filename)
checkErr(err)
defer file.Close()
img, filetype, err := image.Decode(file)
checkErr(err)
var newImage image.Image
if thumbnailSize < img.Bounds().Dx() || thumbnailSize < img.Bounds().Dy() {
if img.Bounds().Dx() > img.Bounds().Dy() {
newImage = resize.Resize(uint(thumbnailSize), 0, img, resize.Lanczos3)
} else {
newImage = resize.Resize(0, uint(thumbnailSize), img, resize.Lanczos3)
}
} else {
newImage = img
}
switch filetype {
case "png":
err = png.Encode(w, newImage)
case "gif":
err = gif.Encode(w, newImage, nil)
case "jpeg", "jpg":
err = jpeg.Encode(w, newImage, nil)
case "bmp":
err = bmp.Encode(w, newImage)
case "tiff":
err = tiff.Encode(w, newImage, nil)
default:
// not sure how you got here but what are we going to do with you?
fmt.Println("Unknown image type: ", filetype)
io.Copy(w, file)
}
checkErr(err)
fmt.Println("done handling request")
})
}
func writeImage(dst string, mf string, m image.Image) {
var err error
w := os.Stdout
if dst != "-" {
w, err = os.Create(dst)
if err != nil {
log.Fatal(err)
}
}
if ext := filepath.Ext(dst); mf == "" && ext != "" {
mf = ext[1:]
}
switch mf {
default:
err = png.Encode(w, m)
case "jpg", "jpeg":
err = jpeg.Encode(w, m, nil)
case "gif":
err = gif.Encode(w, m, nil)
case "tif", "tiff":
err = tiff.Encode(w, m, nil)
case "bmp":
err = bmp.Encode(w, m)
}
if err != nil {
log.Fatal(err)
}
}
func encode(w io.Writer, img image.Image, format imaging.Format, quality int) error {
var err error
switch format {
case imaging.JPEG:
var rgba *image.RGBA
if nrgba, ok := img.(*image.NRGBA); ok {
if nrgba.Opaque() {
rgba = &image.RGBA{
Pix: nrgba.Pix,
Stride: nrgba.Stride,
Rect: nrgba.Rect,
}
}
}
if rgba != nil {
err = jpeg.Encode(w, rgba, &jpeg.Options{Quality: quality})
} else {
err = jpeg.Encode(w, img, &jpeg.Options{Quality: quality})
}
case imaging.PNG:
err = png.Encode(w, img)
case imaging.GIF:
err = gif.Encode(w, img, &gif.Options{NumColors: 256})
case imaging.TIFF:
err = tiff.Encode(w, img, &tiff.Options{Compression: tiff.Deflate, Predictor: true})
case imaging.BMP:
err = bmp.Encode(w, img)
default:
err = imaging.ErrUnsupportedFormat
}
return err
}
// WriteTo implements the io.WriterTo interface, writing a tiff image.
func (c TiffCanvas) WriteTo(w io.Writer) (int64, error) {
wc := writerCounter{Writer: w}
b := bufio.NewWriter(&wc)
if err := tiff.Encode(b, c.img, nil); err != nil {
return wc.n, err
}
err := b.Flush()
return wc.n, err
}
// WriteStdout writes an Image to standard output as a PNG file.
func WriteStdout(img image.Image, data *exif.Exif) {
switch Output {
case JPEG:
// Create a temporary file for exiftool to use
tmp, _ := ioutil.TempFile("", "img-utils-exif-")
path := tmp.Name()
// Encode the jpeg to this temp file
err := jpeg.Encode(tmp, img, nil)
if err != nil {
log.Fatal(err)
return
}
// Write the exif data to the temp file
err = data.Write(path)
if err != nil {
// // This will generally return an error, and it still works, so can
// // probably be ignored.
// log.Println(err)
}
// Reopen the temp file. Yes, really. This is due to the fact that, even if
// I seek to 0, problems still occur. So this works, I'm leaving it.
f, err := os.Open(path)
if err != nil {
log.Fatal(err)
return
}
io.Copy(os.Stdout, f)
// Make sure the temp file is deleted after
defer func() { os.Remove(path) }()
case PNG:
err := png.Encode(os.Stdout, img)
if err != nil {
log.Fatal(err)
return
}
case TIFF:
err := tiff.Encode(os.Stdout, img, nil)
if err != nil {
log.Fatal(err)
return
}
}
}
func Fuzz(data []byte) int {
cfg, err := tiff.DecodeConfig(bytes.NewReader(data))
if err != nil {
return 0
}
if cfg.Width*cfg.Height > 1e6 {
return 0
}
img, err := tiff.Decode(bytes.NewReader(data))
if err != nil {
return 0
}
var w bytes.Buffer
err = tiff.Encode(&w, img, nil)
if err != nil {
panic(err)
}
return 1
}
// Encode image to file
func (c *Convertor) encodeImage(i image.Image, filename string) (err error) {
f, err := os.Create(filename)
if err != nil {
return
}
switch filepath.Ext(filename) {
case ".png":
err = png.Encode(f, i)
case ".tif":
case ".tiff":
err = tiff.Encode(f, i, &tiff.Options{tiff.Uncompressed, false})
case ".gif":
err = gif.Encode(f, i, nil)
default:
err = jpeg.Encode(f, i, &jpeg.Options{c.Opts.Quality})
}
f.Close()
return
}
// Encode implements Encoder.
func (enc *Encoder) Encode(w io.Writer, nim image.Image, params imageserver.Params) error {
return tiff.Encode(w, nim, opts)
}
// Provides image://cover/
func (c *Comics) CoverProvider(file string, width int, height int) image.Image {
c.Conv.Opts = c.GetOptions()
stat, err := os.Stat(file)
if err != nil {
fmt.Fprintf(os.Stderr, "Error Stat CoverProvider: %v\n", err.Error())
return image.NewRGBA(image.Rect(0, 0, width, height))
}
cover, err := c.Conv.GetCoverImage(file, stat)
if err != nil {
fmt.Fprintf(os.Stderr, "Error GetCoverImage: %v\n", err.Error())
return image.NewRGBA(image.Rect(0, 0, width, height))
}
cover = c.Conv.TransformImage(cover)
if c.Conv.Opts.LevelsInMin != 0 || c.Conv.Opts.LevelsInMax != 255 || c.Conv.Opts.LevelsGamma != 1.00 ||
c.Conv.Opts.LevelsOutMin != 0 || c.Conv.Opts.LevelsOutMax != 255 {
cover = c.Conv.LevelImage(cover)
}
// imaging is used for preview only
if c.Conv.Opts.Grayscale {
cover = imaging.Grayscale(cover)
}
// size preview
s := 0
b := new(bytes.Buffer)
w := 0
h := 0
switch c.Conv.Opts.Format {
case "jpeg":
jpeg.Encode(b, cover, &jpeg.Options{c.Conv.Opts.Quality})
s = len(b.Bytes())
cover, _ = jpeg.Decode(bytes.NewReader(b.Bytes()))
config, _, _ := image.DecodeConfig(bytes.NewReader(b.Bytes()))
w = config.Width
h = config.Height
case "png":
png.Encode(b, cover)
s = len(b.Bytes())
cover, _ = png.Decode(bytes.NewReader(b.Bytes()))
config, _, _ := image.DecodeConfig(bytes.NewReader(b.Bytes()))
w = config.Width
h = config.Height
case "gif":
mw := imagick.NewMagickWand()
defer mw.Destroy()
mw.ReadImageBlob(c.Conv.GetImageBytes(cover))
mw.SetImageFormat("GIF")
blob := mw.GetImageBlob()
s = len(blob)
cover, _ = gif.Decode(bytes.NewReader(blob))
config, _, _ := image.DecodeConfig(bytes.NewReader(blob))
w = config.Width
h = config.Height
case "tiff":
tiff.Encode(b, cover, &tiff.Options{tiff.Uncompressed, false})
var buf bytes.Buffer
gz := gzip.NewWriter(&buf)
gz.Write(b.Bytes())
gz.Close()
s = buf.Len()
cover, _ = tiff.Decode(bytes.NewReader(b.Bytes()))
config, _, _ := image.DecodeConfig(bytes.NewReader(b.Bytes()))
w = config.Width
h = config.Height
case "bmp":
mw := imagick.NewMagickWand()
defer mw.Destroy()
bb := c.Conv.GetImageBytes(cover)
mw.ReadImageBlob(bb)
wand := imagick.NewPixelWand()
wand.SetColor("black")
defer wand.Destroy()
mw.SetImageFormat("BMP3")
mw.SetImageBackgroundColor(wand)
mw.SetImageAlphaChannel(imagick.ALPHA_CHANNEL_REMOVE)
mw.SetImageAlphaChannel(imagick.ALPHA_CHANNEL_DEACTIVATE)
mw.SetImageMatte(false)
mw.SetImageCompression(imagick.COMPRESSION_NO)
mw.QuantizeImage(16, mw.GetImageColorspace(), 8, true, true)
var buf bytes.Buffer
blob := mw.GetImageBlob()
gz := gzip.NewWriter(&buf)
gz.Write(blob)
gz.Close()
s = buf.Len()
cover, _ = bmp.Decode(bytes.NewReader(blob))
config, _, _ := image.DecodeConfig(bytes.NewReader(bb))
w = config.Width
h = config.Height
}
if cover == nil {
return image.NewRGBA(image.Rect(0, 0, width, height))
}
human := humanize.IBytes(uint64(s))
c.Root.ObjectByName("sizePreview").Set("text", fmt.Sprintf("%s (%dx%d)", human, w, h))
return cover
}