示例#1
0
// getBlankTileData returns zero 2d tile data with a given scaling and format.
func (d *Data) getBlankTileImage(uuid dvid.UUID, shape dvid.DataShape, scaling Scaling) (image.Image, error) {
	levelSpec, found := d.Levels[scaling]
	if !found {
		return nil, fmt.Errorf("Could not extract tiles for unspecified scale level %d", scaling)
	}
	tileW, tileH, err := shape.GetSize2D(levelSpec.TileSize)
	if err != nil {
		return nil, err
	}
	source, err := datastore.GetDataByUUID(uuid, d.Source)
	if err != nil {
		return nil, err
	}
	src, ok := source.(*imageblk.Data)
	if !ok {
		return nil, fmt.Errorf("Data instance %q for uuid %q is not imageblk.Data", d.Source, uuid)
	}
	bytesPerVoxel := src.Values.BytesPerElement()
	switch bytesPerVoxel {
	case 1, 2, 4, 8:
		numBytes := tileW * tileH * bytesPerVoxel
		data := make([]byte, numBytes, numBytes)
		return dvid.GoImageFromData(data, int(tileW), int(tileH))
	default:
		return nil, fmt.Errorf("Cannot construct blank tile for data %q with %d bytes/voxel",
			d.Source, src.Values.BytesPerElement())
	}
}
示例#2
0
文件: keys.go 项目: tartavull/dvid
// NewTKey returns an imagetile-specific key component based on the components of a tile request.
func NewTKey(tile dvid.ChunkPoint3d, plane dvid.DataShape, scale Scaling) storage.TKey {
	buf := bytes.NewBuffer(plane.Bytes())
	buf.WriteByte(byte(scale))
	buf.WriteByte(byte(3))
	idx := dvid.IndexZYX(tile)
	buf.Write(idx.Bytes())
	return buf.Bytes()
}
示例#3
0
func (s *Shape) FromShape(shape dvid.DataShape) error {
	switch {
	case shape.Equals(dvid.XY):
		*s = XY
	case shape.Equals(dvid.XZ):
		*s = XZ
	case shape.Equals(dvid.YZ):
		*s = YZ
	case shape.Equals(dvid.Vol3d):
		*s = XYZ
	default:
		return fmt.Errorf("No Google BrainMaps shape corresponds to DVID %s shape", shape)
	}
	return nil
}
示例#4
0
// GetTileSpec returns a TileSpec for a given scale and dvid Geometry.
func GetTileSpec(scaling Scaling, shape dvid.DataShape) (*TileSpec, error) {
	ts := new(TileSpec)
	ts.scaling = scaling
	switch {
	case shape.Equals(dvid.XY):
		ts.plane = XY
	case shape.Equals(dvid.XZ):
		ts.plane = XZ
	case shape.Equals(dvid.YZ):
		ts.plane = YZ
	default:
		return nil, fmt.Errorf("No Google BrainMaps slice orientation corresponding to DVID %s shape", shape)
	}
	return ts, nil
}