support for tarzoom in javasceript and build_tarzoom preserve tiles s…

…izes.

js/relight-core.js

@@ -611,6 +611,39 @@ initTree: function() {
 
 			break;
 
+		case "tarzoom":
+			t.tarzoom =[];	
+			t.metaDataURL = t.url + "/" + t.img + ".tzi";
+			t.getTileURL = function (image, x, y, level) {
+				var prefix = image.substr(0, image.lastIndexOf("."));
+				var base = t.url + '/' + t.img + '.tzb';
+
+				return base + ilevel + '/' + x + '_' + y + t.suffix;
+			};
+
+		this.getTileURL = (rasterid, tile) => {
+			const tar = this.tarzoom[rasterid];
+			tile.start = tar.offsets[tile.index];
+			tile.end = tar.offsets[tile.index+1];
+			return tar.url;
+		}; 
+
+			t.parseMetaData = function (response) {
+				if (!response.ok) {
+					throw new Error("Failed loading " + url + ": " + response.statusText);
+				}
+				let json = await response.json();
+				json.url = url.substr(0, url.lastIndexOf(".")) + '.tzb';
+				Object.assign(t, json);
+				t.suffix = t.format;
+				var max = Math.max(t.width, t.height)/t.tilesize;
+				t.nlevels = Math.ceil(Math.log(max) / Math.LN2) + 1;
+				t.tarzoom.push(json);
+			};
+
+			break;
+
+
 		case "zoomify":
 			t.overlap = 0; //overlap is not specified!
 			t.metaDataURL = t.url + "/" + t.img + "/ImageProperties.xml";

scripts/build_tarzoom.py

@@ -2,22 +2,26 @@
 
 import re, os, sys, json, glob, shutil
 
+tilesize_re = re.compile('TileSize="(\d+)"')
+overlap_re = re.compile('Overlap="(\d+)"')
 width_re = re.compile('Width="(\d+)"')
 height_re = re.compile('Height="(\d+)"')
 pos_re = re.compile("(\d+)_(\d+).jp.*g")
 
-tilesize = 256
-overlap = 0
+
 format = 'jpg'
 
 def tarzoom(basename):
-	index =  { "tilesize": tilesize, "overlap": 0, "format":format, "offsets": [0] }
+
+	index =  { "format":format, "offsets": [0] }
 
 	print(basename)
 	with open(basename + '.dzi') as f:
 		contents = f.read()
 		w = index['width']  = int(width_re.search(contents).group(1))
 		h = index['height'] = int(height_re.search(contents).group(1))
+		tilesize = index['tilesize'] = int(tilesize_re.search(contents).group(1))
+		overlap = index['overlap'] = int(overlap_re.search(contents).group(1))
 
 
 	data = open(basename + ".tzb", 'wb')