lots of tweaks...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>

Viewer/features/filesystem.js

@@ -55,7 +55,7 @@ var IndexFormatActions = actions.Actions({
 	config: {
 		'index-dir': '.ImageGrid',
 
-		// XXX should these be 'p' or 'px' (current)...
+		// XXX should these be 'p' or 'px' (current)???
 		'preview-sizes': [
 			75,
 			200,
@@ -65,6 +65,11 @@ var IndexFormatActions = actions.Actions({
 			1440,
 			2160,
 		],
+		'preview-sizes-priority': [
+			75,
+			200,
+			1080,
+		],
 
 		// Supported fields:
 		// 	$INDEX			- index directory name

Viewer/features/sharp.js

@@ -466,6 +466,14 @@ var SharpActions = actions.Actions({
 			var loaded = this.ribbons
 				&& new Set(this.ribbons.getImageGIDs())
 
+			/*/ XXX set this to tmp for .location.load =='loadImages'
+			var base_path = that.location.load == 'loadIndex' ?
+				null
+				: tmp
+			/*/
+			var base_path
+			//*/
+
 			return images
 				.mapChunks(function(gid){
 					return sharp(that.getImagePath(gid))
@@ -485,17 +493,19 @@ var SharpActions = actions.Actions({
 							img.orientation = o.orientation || 0
 							img.flipped = o.flipped
 
-							/* XXX should generate previews in a temp dir or as data-urls...
 							// if image too large, generate preview(s)...
 							var size_threshold = that.config['preview-generate-threshold']
 							if(size_threshold
+									&& img.preview == null
 									&& Math.max(metadata.width, metadata.height) > size_threshold){
 								logger && logger.emit('Image too large', gid)
-								// XXX might be a good idea to only generate 
-								// 		a single preview...
-								// XXX 
-								this.makePreviews(gid) }
-							//*/
+								// XXX make this more generic...
+								// 		...if 'loadImages' should create previews in tmp...
+								that.location.load == 'loadIndex'
+									&& that.makePreviews(gid, 
+										that.config['preview-sizes-priority'] || 1080,
+										base_path,
+										logger) }
 
 							// XXX EXIF -- keep compatible with exiftool...
 							// 		- dates