示例#1
0
func makeThumb(source, destination string) error { // {{{
	file, err := os.Open(source)
	if err != nil {
		return err
	}
	defer file.Close()

	// decode jpeg into image.Image
	img, err := jpeg.Decode(file)
	if err != nil {
		return err
	}

	g := gift.New(
		gift.ResizeToFill(200, 200, gift.LanczosResampling, gift.CenterAnchor),
	)

	out, err := os.Create(destination)
	if err != nil {
		return err
	}
	defer out.Close()

	// write new image to file
	dst := image.NewRGBA(g.Bounds(img.Bounds()))
	g.Draw(dst, img)
	return jpeg.Encode(out, dst, &jpeg.Options{100})
}                                                     // }}}
示例#2
0
func (prc *ResizeProcessor) getFilter(width, height int, params imageserver.Params) (gift.Filter, error) {
	rsp, err := prc.getResampling(params)
	if err != nil {
		return nil, err
	}
	if !params.Has("mode") || width == 0 || height == 0 {
		return gift.Resize(width, height, rsp), nil
	}
	mode, err := params.GetString("mode")
	if err != nil {
		return nil, err
	}
	switch mode {
	case "fit":
		return gift.ResizeToFit(width, height, rsp), nil
	case "fill":
		return gift.ResizeToFill(width, height, rsp, gift.CenterAnchor), nil
	}
	return nil, &imageserver.ParamError{Param: "mode", Message: "invalid value"}
}
示例#3
0
func (r *FilesResource) getImageReader(registry kit.Registry, tmpDir string, file kit.File, width, height int64, filters []string, ip string) (reader kit.ReadSeekerCloser, size int64, err apperror.Error) {
	if width == 0 && height == 0 && len(filters) == 0 {
		reader, err = file.Reader()
		return
	}

	// Dimensions specified.
	// Check if the thumbnail was already created.
	// If so, serve it. Otherwise, create it first.

	if (width == 0 || height == 0) && (file.GetWidth() == 0 || file.GetHeight() == 0) {
		err = &apperror.Err{
			Code:    "image_dimensions_not_determined",
			Message: fmt.Sprintf("The file with id %v does not have width/height", file.GetId()),
		}
		return
	}

	if width < 0 || height < 0 {
		err = apperror.New("invalid_dimensions")
		return
	}

	// If either height or width is 0, determine proper values to presserve aspect ratio.
	if width == 0 {
		ratio := float64(file.GetWidth()) / float64(file.GetHeight())
		width = int64(float64(height) * ratio)
	} else if height == 0 {
		ratio := float64(file.GetHeight()) / float64(file.GetWidth())
		height = int64(float64(width) * ratio)
	}

	maxWidth := registry.Config().UInt("files.thumbGenerator.maxWidth", 2000)
	maxHeight := registry.Config().UInt("files.thumbGenerator.maxHeight", 2000)

	if width > int64(maxWidth) || height > int64(maxHeight) {
		err = &apperror.Err{
			Code:    "dimensions_exceed_maximum_limits",
			Message: "The specified dimensions exceed the maximum limits",
		}
		return
	}

	thumbId := fmt.Sprintf("%v_%v_%v_%v_%v_%v.%v",
		file.GetId(),
		file.GetBucket(),
		file.GetName(),
		strconv.FormatInt(width, 10),
		strconv.FormatInt(height, 10),
		strings.Replace(strings.Join(filters, "_"), ":", "_", -1),
		"jpeg")

	if ok, _ := file.GetBackend().HasFileById("thumbs", thumbId); !ok {
		var channel chan bool
		channel, err = r.thumbnailRateLimiter.Start(ip)
		if err != nil {
			return
		}
		if channel != nil {
			<-channel
		}

		// Thumb does not exist yet, so create it.
		reader, err = file.Reader()
		if err != nil {
			return
		}
		defer reader.Close()

		img, _, err2 := image.Decode(reader)
		if err2 != nil {
			err = apperror.Wrap(err2, "image_decode_error")
			return
		}

		var giftFilters []gift.Filter

		if !(height == 0 && width == 0) {
			giftFilters = append(giftFilters, gift.ResizeToFill(int(width), int(height), gift.LanczosResampling, gift.CenterAnchor))
		}

		for _, filter := range filters {
			if filter == "" {
				continue
			}

			parts := strings.Split(filter, ":")

			if len(parts) > 1 {
				filter = parts[0]
			}

			switch filter {
			case "sepia":
				n := float32(100)

				if len(parts) == 2 {
					x, err2 := strconv.ParseFloat(parts[1], 64)
					if err2 == nil {
						n = float32(x)
					} else {
						err = apperror.New("invalid_sepia_filter_value", true)
						return
					}
				}

				giftFilters = append(giftFilters, gift.Sepia(n))

			case "grayscale":
				giftFilters = append(giftFilters, gift.Grayscale())

			case "brightness":
				n := float32(0)

				if len(parts) == 2 {
					x, err2 := strconv.ParseFloat(parts[1], 64)
					if err2 == nil {
						n = float32(x)
					} else {
						err = apperror.New("invalid_brightness_filter_value", true)
						return
					}
				}

				giftFilters = append(giftFilters, gift.Brightness(n))

			default:
				err = apperror.New("unknown_filter", fmt.Sprintf("Unknown filter: %v", filter), true)
				return
			}
		}

		gift := gift.New(giftFilters...)

		thumb := image.NewRGBA(gift.Bounds(img.Bounds()))
		gift.Draw(thumb, img)

		var writer io.WriteCloser
		_, writer, err = file.GetBackend().WriterById("thumbs", thumbId, true)
		if err != nil {
			return
		}
		defer writer.Close()

		jpeg.Encode(writer, thumb, &jpeg.Options{Quality: 90})

		r.thumbnailRateLimiter.Finish()
	}

	backend := file.GetBackend()
	size, err = backend.FileSizeById("thumbs", thumbId)
	if err != nil {
		return
	}

	reader, err = file.GetBackend().ReaderById("thumbs", thumbId)
	return
}