Golang Geometry.NumVoxels方法代码示例

// NewLabels returns labelblk Labels, a representation of externally usable subvolume
// or slice data, given some geometry and optional image data.
// If img is passed in, the function will initialize Voxels with data from the image.
// Otherwise, it will allocate a zero buffer of appropriate size.
//
// TODO : Unlike the standard imageblk.NewVoxels, the labelblk version can modify the
// labels based on the z-coordinate of the given geometry for Raveler labeling.
// This will be removed when Raveler-specific labels are moved outside DVID.
func (d *Data) NewLabels(geom dvid.Geometry, img interface{}) (*Labels, error) {
	bytesPerVoxel := d.Properties.Values.BytesPerElement()
	stride := geom.Size().Value(0) * bytesPerVoxel
	var data []byte

	if img == nil {
		numVoxels := geom.NumVoxels()
		if numVoxels <= 0 {
			return nil, fmt.Errorf("Illegal geometry requested: %s", geom)
		}
		requestSize := int64(bytesPerVoxel) * numVoxels
		if requestSize > server.MaxDataRequest {
			return nil, fmt.Errorf("Requested payload (%d bytes) exceeds this DVID server's set limit (%d)",
				requestSize, server.MaxDataRequest)
		}
		data = make([]byte, requestSize)
	} else {
		switch t := img.(type) {
		case image.Image:
			var inputBytesPerVoxel, actualStride int32
			var err error
			data, inputBytesPerVoxel, actualStride, err = dvid.ImageData(t)
			if err != nil {
				return nil, err
			}
			if actualStride != stride {
				// Need to do some conversion here.
				switch d.Labeling {
				case Standard64bit:
					data, err = d.convertTo64bit(geom, data, int(inputBytesPerVoxel), int(actualStride))
					if err != nil {
						return nil, err
					}
				case RavelerLabel:
					data, err = d.addLabelZ(geom, data, actualStride)
					if err != nil {
						return nil, err
					}
				default:
					return nil, fmt.Errorf("unexpected label type in labelblk: %s", d.Labeling)
				}
			}
		case []byte:
			data = t
			actualLen := int64(len(data))
			expectedLen := int64(bytesPerVoxel) * geom.NumVoxels()
			if actualLen != expectedLen {
				return nil, fmt.Errorf("labels data was %d bytes, expected %d bytes for %s",
					actualLen, expectedLen, geom)
			}
		default:
			return nil, fmt.Errorf("unexpected image type given to NewVoxels(): %T", t)
		}
	}

	labels := &Labels{
		imageblk.NewVoxels(geom, d.Properties.Values, data, stride),
	}
	return labels, nil
}

// NewVoxels returns Voxels with given geometry and optional image data.
// If img is passed in, the function will initialize the Voxels with data from the image.
// Otherwise, it will allocate a zero buffer of appropriate size.
func (d *Data) NewVoxels(geom dvid.Geometry, img interface{}) (*Voxels, error) {
	bytesPerVoxel := d.Properties.Values.BytesPerElement()
	stride := geom.Size().Value(0) * bytesPerVoxel

	voxels := &Voxels{
		Geometry: geom,
		values:   d.Properties.Values,
		stride:   stride,
	}

	if img == nil {
		numVoxels := geom.NumVoxels()
		if numVoxels <= 0 {
			return nil, fmt.Errorf("Illegal geometry requested: %s", geom)
		}
		requestSize := int64(bytesPerVoxel) * numVoxels
		if requestSize > server.MaxDataRequest {
			return nil, fmt.Errorf("Requested payload (%d bytes) exceeds this DVID server's set limit (%d)",
				requestSize, server.MaxDataRequest)
		}
		voxels.data = make([]uint8, requestSize)
	} else {
		switch t := img.(type) {
		case image.Image:
			var actualStride int32
			var err error
			voxels.data, _, actualStride, err = dvid.ImageData(t)
			if err != nil {
				return nil, err
			}
			if actualStride < stride {
				return nil, fmt.Errorf("Too little data in input image (expected stride %d)", stride)
			}
			voxels.stride = actualStride
		case []byte:
			voxels.data = t
			actualLen := int64(len(voxels.data))
			expectedLen := int64(bytesPerVoxel) * geom.NumVoxels()
			if actualLen != expectedLen {
				return nil, fmt.Errorf("voxels data was %d bytes, expected %d bytes for %s",
					actualLen, expectedLen, geom)
			}
		default:
			return nil, fmt.Errorf("Unexpected image type given to NewVoxels(): %T", t)
		}
	}
	return voxels, nil
}