rewritten data.getImages(..) removing a .compact() related bottleneck...

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

ui (gen4)/data.js

@@ -849,7 +849,8 @@ var DataPrototype = {
 	// 		one of the contained images (first?)
 	// XXX for some reason negative target number (ribbon number) 
 	// 		breaks this...
-	getImages: function(target, count, mode){
+	/*
+	_getImages: function(target, count, mode){
 		target = (target == null && count == null) ? 'loaded' : target
 		mode = mode == null ? 'around' : mode
 		var list
@@ -898,6 +899,7 @@ var DataPrototype = {
 		// get the ribbon gids...
 		if(list == null){
 			list = this.ribbons[this.getRibbon(target)] 
+			// XXX compacting here is bad, we'll be handling the whole ribbon...
 			list = list != null ? list.compact() : []
 		}
 
@@ -914,15 +916,24 @@ var DataPrototype = {
 			var from = i - Math.floor(count)
 			var to = i + Math.ceil(count)
 
+			var pre = Math.floor(count)
+			var post = Math.ceil(count)
+
 		} else if(mode == 'before'){
 			// NOTE: we are shifting by 1 to include the target...
 			var from = (i - count) + 1
 			var to = i + 1
 
+			var pre = count - 1 
+			var post = 0 
+
 		} else if(mode == 'after'){
 			var from = i
 			var to = i + count
 
+			var pre = 0
+			var post = count - 1
+
 		} else {
 			// XXX bad mode....
 			return null
@@ -932,6 +943,127 @@ var DataPrototype = {
 		from = Math.max(0, from)
 
 		return list.slice(from, to)
+
+
+		var res = [target]
+
+		// pre...
+		for(var n = i-1; n >= 0 && pre > 0; n--){
+			if(n in list){
+				res.push(list[n])
+				pre--
+			}
+		}
+
+		res.reverse()
+		// post...
+		for(var n = i+1; n < list.length && post > 0; n--){
+			if(n in list){
+				res.push(list[n])
+				post--
+			}
+		}
+		return res
+	},
+	*/
+	// NOTE: this is a partial rewrite avoiding .compact() as much as 
+	// 		possible and restricting it to as small a subset as possible
+	getImages: function(target, count, mode){
+		target = (target == null && count == null) ? 'loaded' : target
+		mode = mode == null ? 'around' : mode
+		var list
+
+		// normalize target and build the source list...
+
+		// 'current' ribbon...
+		target = target == 'current' ? this.current : target
+
+		// get all gids...
+		if(target == 'all'){
+			list = this.order
+			target = null
+
+		// get loaded only gids...
+		} else if(target == 'loaded'){
+			var res = []
+			var ribbons = this.ribbons
+			for(var k in ribbons){
+				this.makeSparseImages(ribbons[k], res)
+			}
+			list = res.compact()
+			target = null 
+
+		// filter out the unloaded gids from given list...
+		} else if(target != null && target.constructor === Array){
+			var loaded = count == 'current' ? this.getImages('current')
+				: count in this.ribbons ? this.ribbons[count].compact()
+				: typeof(count) == typeof(123) ? 
+					this.ribbons[this.getRibbon(count)].compact()
+				: this.getImages('loaded')
+			count = null 
+
+			list = target.filter(function(e){
+				return loaded.indexOf(e) >= 0
+			})
+
+			target = null 
+
+		// target is ribbon gid...
+		} else if(target in this.ribbons){
+			list = this.ribbons[target]
+		}
+
+		// NOTE: list can be null if we got an image gid or ribbon order...
+		// get the ribbon gids...
+		list = list || this.ribbons[this.getRibbon(target)] || []
+
+		if(count == null){
+			return list.compact()
+		}
+
+		target = this.getImage(target)
+		var i = list.indexOf(target)
+
+		// prepare to slice the list...
+		if(mode == 'around'){
+			count = count/2
+			var pre = Math.floor(count)
+			var post = Math.ceil(count) - 1
+
+		} else if(mode == 'before'){
+			var pre = count - 1 
+			var post = 0 
+
+		} else if(mode == 'after'){
+			var pre = 0
+			var post = count - 1
+
+		} else {
+			// XXX bad mode....
+			return null
+		}
+
+		var res = [target]
+
+		// pre...
+		for(var n = i-1; n >= 0 && pre > 0; n--){
+			if(n in list){
+				res.push(list[n])
+				pre--
+			}
+		}
+
+		res.reverse()
+
+		// post...
+		for(var n = i+1; n < list.length && post > 0; n++){
+			if(n in list){
+				res.push(list[n])
+				post--
+			}
+		}
+
+		return res
 	},
 
 	// Get ribbon...