Fix the previous commit for improving memory consumption.

Allocate the list with the correct capacity ahead, and avoid any needs for increasing the capacity when applying the shadow later.

--HG--
branch : liortal/improve-memory-behaviour-by-preallocatin-1444835033293

Scripts/NicerOutline.cs

@@ -8,8 +8,7 @@ namespace UnityEngine.UI.Extensions
 	[AddComponentMenu("UI/Effects/Extensions/Nicer Outline")]
 	public class NicerOutline : BaseMeshEffect
 	{
-	    // A constant factor used when allocating the vertex list.
-		private const int GROWTH_FACTOR = 24;
+		private const int VERTICES_PER_QUAD = 6;
 		
 		[SerializeField]
 		private Color m_EffectColor = new Color (0f, 0f, 0f, 0.5f);
@@ -94,10 +93,6 @@ namespace UnityEngine.UI.Extensions
         {
             UIVertex vt;
 
-            var neededCpacity = verts.Count * 2;
-            if (verts.Capacity < neededCpacity)
-                verts.Capacity = neededCpacity;
-
             for (int i = start; i < end; ++i)
             {
                 vt = verts[i];
@@ -117,10 +112,6 @@ namespace UnityEngine.UI.Extensions
 
         protected void ApplyShadow(List<UIVertex> verts, Color32 color, int start, int end, float x, float y)
         {
-            var neededCpacity = verts.Count * 2;
-            if (verts.Capacity < neededCpacity)
-                verts.Capacity = neededCpacity;
-
             ApplyShadowZeroAlloc(verts, color, start, end, x, y);
         }
 
@@ -131,7 +122,11 @@ namespace UnityEngine.UI.Extensions
 			{
 				return;
 			}
-            List < UIVertex > verts = new List<UIVertex>(GROWTH_FACTOR * mesh.vertices.Length);
+			
+			// Initilize a list with the correct capacity, to avoid unneeded allocations later.
+			// The list will hold 9 copies of the vertex data (original + 8 copies).
+            List < UIVertex > verts = new List<UIVertex>(9 * (mesh.vertices.Length / 4 * VERTICES_PER_QUAD));
+            
 			using (var helper = new VertexHelper(mesh))
             {
                 helper.GetUIVertexStream(verts);