Method getRoi

ij/src/main/java/ij/io/RoiDecoder.java:166–416

Returns the ROI.

()

	/** Returns the ROI. */
	public Roi getRoi() throws IOException {
		if (path!=null) {
			File f = new File(path);
			size = (int)f.length();
			if (!path.endsWith(".roi") && size>5242880)
				throw new IOException("This is not an ROI or file size>5MB)");
			name = f.getName();
			is = new FileInputStream(path);
		}
		data = new byte[size];

		int total = 0;
		while (total<size)
			total += is.read(data, total, size-total);
		is.close();
		if (getByte(0)!=73 || getByte(1)!=111)  //"Iout"
			throw new IOException("This is not an ImageJ ROI");
		int version = getShort(VERSION_OFFSET);
		int type = getByte(TYPE);
		int subtype = getShort(SUBTYPE);
		int top= getShort(TOP);
		int left = getShort(LEFT);
		int bottom = getShort(BOTTOM);
		int right = getShort(RIGHT);
		int width = right-left;
		int height = bottom-top;
		int n = getUnsignedShort(N_COORDINATES);
		if (n==0)
			n = getInt(SIZE);
		int options = getShort(OPTIONS);
		int position = getInt(POSITION);
		int hdr2Offset = getInt(HEADER2_OFFSET);
		int channel=0, slice=0, frame=0;
		int overlayLabelColor=0;
		int overlayFontSize=0;
		int group=0;
		int imageOpacity=0;
		int imageSize=0;
		boolean subPixelResolution = (options&SUB_PIXEL_RESOLUTION)!=0 &&  version>=222;
		boolean drawOffset = subPixelResolution && (options&DRAW_OFFSET)!=0;
		boolean scaleStrokeWidth = true;
		if (version>=228)
			scaleStrokeWidth = (options&SCALE_STROKE_WIDTH)!=0;
		
		boolean subPixelRect = version>=223 && subPixelResolution && (type==rect||type==oval);
		double xd=0.0, yd=0.0, widthd=0.0, heightd=0.0;
		if (subPixelRect) {
			xd = getFloat(XD);
			yd = getFloat(YD);
			widthd = getFloat(WIDTHD);
			heightd = getFloat(HEIGHTD);
		}
		
		if (hdr2Offset>0 && hdr2Offset+IMAGE_SIZE+4<=size) {
			channel = getInt(hdr2Offset+C_POSITION);
			slice = getInt(hdr2Offset+Z_POSITION);
			frame = getInt(hdr2Offset+T_POSITION);
			overlayLabelColor = getInt(hdr2Offset+OVERLAY_LABEL_COLOR);