Пример #1
0
// ServeTile returns a tile with appropriate Content-Type set.
func (d *Data) ServeTile(uuid dvid.UUID, ctx storage.Context, w http.ResponseWriter,
	r *http.Request, parts []string) error {

	if d.Levels == nil || len(d.Levels) == 0 {
		return ErrNoMetadataSet
	}
	tileReq, err := d.parseTileReq(r, parts)

	queryValues := r.URL.Query()
	noblanksStr := dvid.InstanceName(queryValues.Get("noblanks"))
	var noblanks bool
	if noblanksStr == "true" {
		noblanks = true
	}
	var formatStr string
	if len(parts) >= 8 {
		formatStr = parts[7]
	}

	data, err := d.getTileData(ctx, tileReq)
	if err != nil {
		server.BadRequest(w, r, err)
		return err
	}
	if data == nil {
		if noblanks {
			http.NotFound(w, r)
			return nil
		}
		img, err := d.getBlankTileImage(uuid, tileReq)
		if err != nil {
			return err
		}
		return dvid.WriteImageHttp(w, img, formatStr)
	}

	switch d.Encoding {
	case LZ4:
		var img dvid.Image
		if err := img.Deserialize(data); err != nil {
			return err
		}
		data, err = img.GetPNG()
		w.Header().Set("Content-type", "image/png")
	case PNG:
		w.Header().Set("Content-type", "image/png")
	case JPG:
		w.Header().Set("Content-type", "image/jpeg")
	}
	if err != nil {
		server.BadRequest(w, r, err)
		return err
	}
	if _, err = w.Write(data); err != nil {
		return err
	}
	return nil
}
Пример #2
0
// ServeTile returns a tile with appropriate Content-Type set.
func (d *Data) ServeTile(uuid dvid.UUID, ctx storage.Context, w http.ResponseWriter,
	r *http.Request, parts []string) error {

	if len(parts) < 7 {
		return fmt.Errorf("'tile' request must be following by plane, scale level, and tile coordinate")
	}
	planeStr, scalingStr, coordStr := parts[4], parts[5], parts[6]
	queryValues := r.URL.Query()
	noblanksStr := dvid.InstanceName(queryValues.Get("noblanks"))
	var noblanks bool
	if noblanksStr == "true" {
		noblanks = true
	}
	var formatStr string
	if len(parts) >= 8 {
		formatStr = parts[7]
	}

	// Construct the index for this tile
	plane := dvid.DataShapeString(planeStr)
	shape, err := plane.DataShape()
	if err != nil {
		err = fmt.Errorf("Illegal tile plane: %s (%v)", planeStr, err)
		server.BadRequest(w, r, err)
		return err
	}
	scaling, err := strconv.ParseUint(scalingStr, 10, 8)
	if err != nil {
		err = fmt.Errorf("Illegal tile scale: %s (%v)", scalingStr, err)
		server.BadRequest(w, r, err)
		return err
	}
	tileCoord, err := dvid.StringToPoint(coordStr, "_")
	if err != nil {
		err = fmt.Errorf("Illegal tile coordinate: %s (%v)", coordStr, err)
		server.BadRequest(w, r, err)
		return err
	}
	if tileCoord.NumDims() != 3 {
		err = fmt.Errorf("Expected 3d tile coordinate, got %s", coordStr)
		server.BadRequest(w, r, err)
		return err
	}
	indexZYX := dvid.IndexZYX{tileCoord.Value(0), tileCoord.Value(1), tileCoord.Value(2)}
	data, err := d.getTileData(ctx, shape, Scaling(scaling), indexZYX)
	if err != nil {
		server.BadRequest(w, r, err)
		return err
	}
	if data == nil {
		if noblanks {
			http.NotFound(w, r)
			return nil
		}
		img, err := d.getBlankTileImage(uuid, shape, Scaling(scaling))
		if err != nil {
			return err
		}
		return dvid.WriteImageHttp(w, img, formatStr)
	}

	switch d.Encoding {
	case LZ4:
		var img dvid.Image
		if err := img.Deserialize(data); err != nil {
			return err
		}
		data, err = img.GetPNG()
		w.Header().Set("Content-type", "image/png")
	case PNG:
		w.Header().Set("Content-type", "image/png")
	case JPG:
		w.Header().Set("Content-type", "image/jpeg")
	}
	if err != nil {
		server.BadRequest(w, r, err)
		return err
	}
	if _, err = w.Write(data); err != nil {
		return err
	}
	return nil
}