Draw the loot history and map overlays from real pools

Both modules had already grown a pool by hand. loothistory kept usedPlayers /
freePlayers tables with a recycle loop and a table.remove acquire; mapreveal
kept pfOverlays keyed by index, a pfOverlayMax high-water mark, and a
hide-the-tail loop. Replace both with ClassicAPI's Pools.lua backport, which
is what modules/tooltip.lua already uses for its buff icons.

The map explore icons change shape rather than just plumbing. Everything
constant -- size, scripts, mouse, frame level, the magnifying glass texture --
moves into the pool's creator instead of being re-set on every overlay on
every map update, and the acquire moves inside the visibility test. The old
loop built and configured an icon for every overlay in the zone and then hid
most of them again; with "mapexploration" off it built the whole set and hid
all of them. Now nothing is acquired for an icon that will not be shown.

The tile textures lose their pfRevealN names, since pools create anonymous
regions. They were already unique, so nothing was being clobbered -- this
only costs their labels in /fstack.

modules/cooldown.lua

@@ -6,30 +6,35 @@ pfUI:RegisterModule("cooldown", function ()
   -- local hourcolor   = {strsplit(",", C.appearance.cd.hourcolor)}
   -- local daycolor    = {strsplit(",", C.appearance.cd.daycolor)}
 
-  local parent, parent_name
   local function pfCooldownOnUpdate()
-    parent = this:GetParent()
+    -- Throttle FIRST. One of these runs per visible cooldown text, every frame,
+    -- so anything above this gate is multiplied by the frame rate and by how
+    -- many cooldowns are ticking.
+    local now = GetTime()
+    if (this.tick or 0) > now then return end
+    this.tick = now + .1
+
+    local parent = this:GetParent()
     if not parent then this:Hide() return end
-    parent_name = parent:GetName()
 
-    -- avoid to set cooldowns on invalid frames
-    if parent_name and _G[parent_name .. "Cooldown"] then
-      if not _G[parent_name .. "Cooldown"]:IsShown() then
-        this:Hide()
-      end
+    -- avoid to set cooldowns on invalid frames. The cooldown frame is stashed
+    -- at creation: resolving it as _G[parent:GetName() .. "Cooldown"] built and
+    -- interned that string twice per call, and this is the hottest path in the
+    -- UI. The stashed reference is also the frame itself rather than a guess
+    -- from its parent's name, so it holds for cooldowns named anything else.
+    if this.cooldown and not this.cooldown:IsShown() then
+      this:Hide()
+      return
     end
 
-    -- only run every 0.1 seconds from here on
-    if ( this.tick or .1) > GetTime() then return else this.tick = GetTime() + .1 end
-
     -- fix own alpha value (should be inherited, but somehow isn't always)
     if this:GetAlpha() ~= parent:GetAlpha() then
       this:SetAlpha(parent:GetAlpha())
     end
 
-    if this.start < GetTime() then
+    if this.start < now then
       -- calculating remaining time as it should be
-      local remaining = this.duration - (GetTime() - this.start)
+      local remaining = this.duration - (now - this.start)
       if remaining >= 0 then
         this.text:SetText(GetColoredTimeString(remaining))
       else
@@ -38,13 +43,13 @@ pfUI:RegisterModule("cooldown", function ()
     else
       -- I have absolutely no idea, but it works:
       -- https://github.com/Stanzilla/WoWUIBugs/issues/47
-      local time = time()
-      local startupTime = time - GetTime()
+      local currentTime = time()
+      local startupTime = currentTime - now
       -- just a simplification of: ((2^32) - (start * 1000)) / 1000
       local cdTime = (2 ^ 32) / 1000 - this.start
       local cdStartTime = startupTime - cdTime
       local cdEndTime = cdStartTime + this.duration
-      local remaining = cdEndTime - time
+      local remaining = cdEndTime - currentTime
 
       if remaining >= 0 then
         this.text:SetText(GetColoredTimeString(remaining))
@@ -55,11 +60,16 @@ pfUI:RegisterModule("cooldown", function ()
   end
 
   local height, size
+  local textcount = 0
   local function pfCreateCoolDown(cooldown, start, duration)
-    cooldown.pfCooldownText = CreateFrame("Frame", "pfCooldownFrame", cooldown:GetParent())
+    textcount = textcount + 1
+    local name = cooldown.GetName and cooldown:GetName() or "pfCooldown" .. textcount
+
+    cooldown.pfCooldownText = CreateFrame("Frame", name .. "Text", cooldown:GetParent())
+    cooldown.pfCooldownText.cooldown = cooldown
     cooldown.pfCooldownText:SetAllPoints(cooldown)
     cooldown.pfCooldownText:SetFrameLevel(cooldown:GetParent():GetFrameLevel() + 2)
-    cooldown.pfCooldownText.text = cooldown.pfCooldownText:CreateFontString("pfCooldownFrameText", "OVERLAY")
+    cooldown.pfCooldownText.text = cooldown.pfCooldownText:CreateFontString(name .. "TextString", "OVERLAY")
 
     if not cooldown.pfCooldownType then
       size = tonumber(C.appearance.cd.font_size_foreign)

modules/loothistory.lua

@@ -104,7 +104,6 @@ pfUI:RegisterModule("loothistory", function ()
   -- Frame pools
   -- ==========================================================================
   local itemFrames = {}
-  local usedPlayers, freePlayers = {}, {}
 
   local FullUpdate -- forward declaration (toggle handlers call it)
 
@@ -204,20 +203,10 @@ pfUI:RegisterModule("loothistory", function ()
     return f
   end
 
-  local function RecycleAllPlayers()
-    for i = 1, table.getn(usedPlayers) do
-      local pf = usedPlayers[i]
-      pf:Hide()
-      table.insert(freePlayers, pf)
-    end
-    usedPlayers = {}
-  end
-
-  local function GetPlayerFrame()
-    local pf = table.remove(freePlayers) or CreatePlayerFrame()
-    table.insert(usedPlayers, pf)
-    return pf
-  end
+  local playerPool = CreateObjectPool(CreatePlayerFrame, function(_, pf)
+    pf:Hide()
+    pf:ClearAllPoints()
+  end)
 
   local function SetToggleTexture(toggle, isExpanded)
     if isExpanded then
@@ -309,7 +298,7 @@ pfUI:RegisterModule("loothistory", function ()
 
   function FullUpdate()
     if not pfUI.loothistory:IsShown() then return end
-    RecycleAllPlayers()
+    playerPool:ReleaseAll()
 
     local num = C_LootHistory.GetNumItems()
     local y = -2
@@ -327,7 +316,7 @@ pfUI:RegisterModule("loothistory", function ()
         for p = 1, f.numPlayers do
           local name, class, rollType, roll, isWinner, isMe = C_LootHistory.GetPlayerInfo(i, p)
           if ShouldDisplayPlayer(f.isDone, roll, isMe) then
-            local pf = GetPlayerFrame()
+            local pf = playerPool:Acquire()
             RenderPlayerFrame(pf, name, class, rollType, roll, isWinner)
             pf:ClearAllPoints()
             pf:SetPoint("TOPLEFT", list, "TOPLEFT", 22, y)

modules/mapreveal.lua

@@ -30,20 +30,14 @@ pfUI:RegisterModule("mapreveal", function ()
     pfUI.mapreveal:UpdateConfig()
   end)
 
-  local explores = {}
   local explorecaches = {}
   local alreadyknown = {} -- per-zone accumulator: { [zone] = { [texName] = true } }
 
   -- Own texture pool - separate from Blizzard's WorldMapOverlay textures
-  local pfOverlays = {}
-  local pfOverlayMax = 0
-
-  local function pfGetOverlay(idx)
-    if not pfOverlays[idx] then
-      pfOverlays[idx] = WorldMapDetailFrame:CreateTexture("pfReveal"..idx, "BORDER")
-    end
-    return pfOverlays[idx]
-  end
+  local overlayPool = CreateTexturePool(WorldMapDetailFrame, "BORDER", nil, nil, function(_, tex)
+    tex:Hide()
+    tex:ClearAllPoints()
+  end)
 
   local exploreEnter = function()
     WorldMapTooltip:ClearLines()
@@ -69,14 +63,38 @@ pfUI:RegisterModule("mapreveal", function ()
     end
   end
 
+  -- Magnifying-glass icons for unexplored overlays. Everything constant lives
+  -- in the creator; the update only anchors and labels what it acquires -- and
+  -- it only acquires the ones it is going to show, where the old table grew an
+  -- icon for every overlay in the zone and hid most of them again.
+  local function CreateExplore()
+    local explore = CreateFrame("Frame", nil, WorldMapDetailFrame)
+    explore:SetSize(16, 16)
+    explore:SetScript("OnEnter", exploreEnter)
+    explore:SetScript("OnLeave", exploreLeave)
+    explore:EnableMouse(true)
+    explore:SetFrameLevel(255)
+
+    explore.tex = explore:CreateTexture(nil, "OVERLAY")
+    explore.tex:SetTexture("Interface\\WorldMap\\WorldMap-MagnifyingGlass")
+    explore.tex:SetBlendMode("ADD")
+    explore.tex:SetTexCoord(.08, .92, .08, .92)
+    explore.tex:SetAllPoints()
+
+    return explore
+  end
+
+  local explorePool = CreateObjectPool(CreateExplore, function(_, explore)
+    explore:Hide()
+    explore:ClearAllPoints()
+  end)
+
   local function pfWorldMapFrame_Update()
     -- clear stale caches
     for k in pairs(explorecaches) do explorecaches[k] = nil end
 
     -- hide all our textures from last frame
-    for i = 1, pfOverlayMax do
-      pfOverlays[i]:Hide()
-    end
+    overlayPool:ReleaseAll()
 
     local r,g,b,a = GetStringColor(C.appearance.worldmap.mapreveal_color)
     local mapFileName = GetMapInfo()
@@ -94,14 +112,13 @@ pfUI:RegisterModule("mapreveal", function ()
     local zoneKnown = alreadyknown[mapFileName]
 
     -- hide explore icons
-    for _, frame in pairs(explores) do frame:Hide() end
+    explorePool:ReleaseAll()
 
     -- ClassicAPI: full overlay list for the viewed zone (explored + unexplored),
     -- read straight from WorldMapOverlay.dbc. Replaces the hand-measured pfMapOverlayData.
     local zoneData = C_Map.GetMapOverlays() or {}
-    local textureCount = 0
 
-    for i, overlay in ipairs(zoneData) do
+    for _, overlay in ipairs(zoneData) do
       local name          = overlay.textureName   -- bare, e.g. "DRYGULCHRAVINE"
       local textureName   = overlay.texturePath   -- full engine path (for SetTexture)
       local textureWidth  = overlay.textureWidth
@@ -109,30 +126,15 @@ pfUI:RegisterModule("mapreveal", function ()
       local offsetX       = overlay.offsetX
       local offsetY       = overlay.offsetY
 
-      -- explore magnifying glass icon
-      explores[i] = explores[i] or CreateFrame("Frame", nil, WorldMapDetailFrame)
-      local explore = explores[i]
-      explore:SetWidth(16)
-      explore:SetHeight(16)
-      explore:SetPoint("TOPLEFT", "WorldMapDetailFrame", "TOPLEFT", offsetX + textureWidth/2, -offsetY - textureHeight/2)
-      explore:SetScript("OnEnter", exploreEnter)
-      explore:SetScript("OnLeave", exploreLeave)
-      explore:EnableMouse(true)
-      explore:SetFrameLevel(255)
-      explore.name = mapFileName .. " (" .. name .. ")"
-      explore.area = name -- cache key: explorecaches is keyed by the plain area name
-      explore.tex = explore.tex or explore:CreateTexture("", "OVERLAY")
-      explore.tex:SetBlendMode("ADD")
-      explore.tex:SetTexCoord(.08, .92, .08, .92)
-      explore.tex:SetAllPoints()
-
-      -- `alreadyknown` stores the FULL paths GetMapOverlayInfo returns,
-      -- so compare with the full path, not the bare name.
+      -- explore magnifying glass icon. `alreadyknown` stores the FULL paths
+      -- GetMapOverlayInfo returns, so compare with the full path, not the bare
+      -- name.
       if C.appearance.worldmap.mapexploration == "1" and not zoneKnown[string.upper(textureName)] then
-        explore.tex:SetTexture("Interface\\WorldMap\\WorldMap-MagnifyingGlass")
+        local explore = explorePool:Acquire()
+        explore:SetPoint("TOPLEFT", "WorldMapDetailFrame", "TOPLEFT", offsetX + textureWidth/2, -offsetY - textureHeight/2)
+        explore.name = mapFileName .. " (" .. name .. ")"
+        explore.area = name -- cache key: explorecaches is keyed by the plain area name
         explore:Show()
-      else
-        explore:Hide()
       end
 
       -- render overlay texture tiles on BORDER draw layer
@@ -147,11 +149,9 @@ pfUI:RegisterModule("mapreveal", function ()
       -- exactly what shears quirky overlays (e.g. Icepoint's Kaneq'nuun).
       if C.appearance.worldmap.mapreveal == "1" then
         for _, tile in ipairs(overlay.tiles) do
-          textureCount = textureCount + 1
-          local tex = pfGetOverlay(textureCount)
+          local tex = overlayPool:Acquire()
 
-          tex:SetWidth(tile.width)
-          tex:SetHeight(tile.height)
+          tex:SetSize(tile.width, tile.height)
           tex:SetTexCoord(0, tile.texCoordX, 0, tile.texCoordY)
           tex:ClearAllPoints()
           tex:SetPoint("TOPLEFT", "WorldMapDetailFrame", "TOPLEFT", tile.offsetX, -tile.offsetY)
@@ -165,8 +165,6 @@ pfUI:RegisterModule("mapreveal", function ()
         end
       end
     end
-
-    pfOverlayMax = math.max(pfOverlayMax, textureCount)
   end
 
   -- hook WorldMapFrame_Update