示例#1
13
文件: images.go 项目: xcsrz/SurfMedia
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")

	})
}
示例#2
0
文件: io.go 项目: crhym3/imgdiff
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)
	}
}
示例#3
0
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
}
示例#4
0
文件: vgimg.go 项目: zzn01/plot
// 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
}
示例#5
0
文件: utils.go 项目: hawx/img
// 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
		}
	}
}
示例#6
0
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
}
示例#7
0
// 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
}
示例#8
0
// Encode implements Encoder.
func (enc *Encoder) Encode(w io.Writer, nim image.Image, params imageserver.Params) error {
	return tiff.Encode(w, nim, opts)
}
示例#9
0
// 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
}