[EvilMaddness]

-- minimap default position - you can move it ingame by holding down ALT!
position = "TOPRIGHT"       
position_x = -200               
position_y = -200               
 
-- achievement/quest tracker position
moveWatchFrame = false          -- enable/disable positioning, set to false if you are using a different addon to move it
qparent = UIParent         
qanchor = "TOPRIGHT"     
qposition_x = -60           
qposition_y = -260         
qheight = 400             
 
local useInfoPanel = true       -- enable disable fps/latency and clock
local showclock = false         -- ONLY show clock - makes sense to set useInfoPanel to false if you only want to show the clock ^^
local AddonNumb = 30            -- maximum number of addons shown in tooltip (will always show set number of top memory usage addons)
 
local mediaFolder = "Interface\\AddOns\\dMedia\\"   -- don't touch this ...
local texture = "Interface\\Buttons\\WHITE8x8"
--local backdrop = {bgFile = texture, edgeFile = texture, edgeSize = 1, insets = { left = -1, right = -1, top = -1, bottom = -1}}
local backdrop = {edgeFile = texture, edgeSize = 1}
    
local mailicon = mediaFolder.."mail"
local font = mediaFolder.."big_noodle_titling.ttf"
local fontSize = 12
local fontFlag = "THINOUTLINE"          -- "THINOUTLINE", "OUTLINE MONOCHROME", "OUTLINE" or nil (no outline)
 
local backdropcolor = {26/255, 25/255, 31/255}      -- backdrop color   
local brdcolor = {0/255, 0/255, 0/255}              -- backdrop border color
local infocolor = {29/255, 63/255, 72/255}          -- info panel color
local IpanelBGalpha = 0.3                           -- info panel background alpha
 
local classColoredBorder = false                    -- color border by class
local scale = 1
 
local enableCombatFade = true                       -- enable/disable fade out in combat
local inCombatAlpha = 0.3                           -- in combat alpha
local outCombatAlpha = 1.0                          -- ooc alpha
 
-----------
-- style --
-----------
local _, class = UnitClass('player')
local color = CUSTOM_CLASS_COLORS and CUSTOM_CLASS_COLORS[class] or RAID_CLASS_COLORS[class]            
 
Minimap:SetSize(253*scale, 253*scale)
Minimap:SetMaskTexture(mediaFolder.."rectangle")
Minimap:SetHitRectInsets(30, 25, 75*scale, 75*scale)
Minimap:ClearAllPoints()
Minimap:SetPoint(position, UIParent, position_x, position_y)
Minimap:SetScale(scale)
Minimap:SetFrameLevel(8)
 
BorderFrame = CreateFrame("Frame", nil, UIParent)
BorderFrame:SetPoint("TOPLEFT", Minimap, "TOPLEFT", 23, -(75*scale))
BorderFrame:SetPoint("BOTTOMRIGHT", Minimap, "BOTTOMRIGHT", -23, (75*scale))
    
BorderFrame:SetBackdrop(backdrop)
if not classColoredBorder then
    BorderFrame:SetBackdropBorderColor(unpack(brdcolor))
else
    BorderFrame:SetBackdropBorderColor(color.r, color.g, color.b)
end 
BorderFrame:SetBackdropColor(unpack(backdropcolor))
BorderFrame:SetFrameLevel(6)        
 
------------------------
-- fps latency memory --
------------------------
if useInfoPanel then    
 
local FLMframe = CreateFrame("Button", "FLMframe", UIParent)
FLMframe:SetPoint("TOP", Minimap, "BOTTOM", 0, 20*scale)
FLMframe:SetSize((Minimap:GetWidth()+2)*scale, fontSize+6)
FLMframe:SetFrameLevel(4)
FLMframe:SetBackdrop(backdrop)
if not classColoredBorder then
    FLMframe:SetBackdropBorderColor(unpack(brdcolor))
else
    FLMframe:SetBackdropBorderColor(color.r, color.g, color.b)
end 
FLMframe:SetBackdropColor(unpack(backdropcolor))
 
local FLMframeT = FLMframe:CreateTexture(nil, "ARTWORK")
FLMframeT:SetPoint("TOPLEFT", FLMframe, "TOPLEFT", 1, -1)
FLMframeT:SetPoint("BOTTOMRIGHT", FLMframe, "BOTTOMRIGHT", -1, 1)   
--FLMframeT:SetTexture(mediaFolder.."dO")
FLMframeT:SetTexture(texture)
FLMframeT:SetVertexColor(unpack(infocolor))
FLMframeT:SetAlpha(IpanelBGalpha)
 
local text = FLMframe:CreateFontString(nil, "OVERLAY")
text:SetPoint("CENTER", FLMframe, 4, 0)
text:SetFont(font, fontSize, fontFlag)
--text:SetShadowOffset(1, -1)
text:SetTextColor(color.r, color.g, color.b)
    
    --========[ important functions ]========--
local function Addoncompare(a, b)
    return a.memory > b.memory
end
 
local function MemFormat(v)
    if (v > 1024) then
        return string.format("%.2f MiB", v / 1024)
    else
        return string.format("%.2f KiB", v)
    end
end
 
local function ColorGradient(perc, ...)
    if (perc > 1) then
        local r, g, b = select(select('#', ...) - 2, ...)
        return r, g, b
    elseif (perc < 0) then
        local r, g, b = ...
        return r, g, b
    end
    
    local num = select('#', ...) / 3
 
    local segment, relperc = math.modf(perc*(num-1))
    local r1, g1, b1, r2, g2, b2 = select((segment*3)+1, ...)
 
    return r1 + (r2-r1)*relperc, g1 + (g2-g1)*relperc, b1 + (b2-b1)*relperc
end
 
local function TimeFormat(time)
    local t = format("%.1ds",floor(mod(time,60)))
    if (time > 60) then
        time = floor(time / 60)
        t = format("%.1dm ",mod(time,60))..t
        if (time > 60) then
            time = floor(time / 60)
            t = format("%.1dh ",mod(time,24))..t
            if (time > 24) then
                time = floor(time / 24)
                t = format("%dd ",time)..t
            end
        end
    end
    return t
end
 
local function ColorizeLatency(v)
    if (v < 100) then
        return {r = 0, g = 1, b = 0}
    elseif (v < 300) then
        return {r = 1, g = 1, b = 0}
    else
        return {r = 1, g = 0, b = 0}
    end
end
 
local function ColorizeFramerate(v)
    if (v < 10) then
        return {r = 1, g = 0, b = 0}
    elseif (v < 30) then
        return {r = 1, g = 1, b = 0}
    else
        return {r = 0, g = 1, b = 0}
    end
end
    
    --========[ update ]========--
local lastUpdate = 0
local updateDelay = 1
FLMframe:SetScript("OnUpdate", function(self, elapsed)
    lastUpdate = lastUpdate + elapsed
    if (lastUpdate > updateDelay) then
        lastUpdate = 0
        local time = date("|c00ffffff%H|r:|c00ffffff%M|r")
        fps = GetFramerate()
        fps = "|c00ffffff"..floor(fps+0.5).."|r fps   "
        lag = select(4, GetNetStats())
        lag = "|c00ffffff"..lag.."|r ms   "
        text:SetText(lag..fps..time)
    end
end)
 
FLMframe:SetScript("OnEnter", function()
    GameTooltip:SetOwner(FLMframe)
    collectgarbage()
    local memory, i, addons, total, entry, total
    local latencycolor = ColorizeLatency(select(3, GetNetStats()))
    local fpscolor = ColorizeFramerate(GetFramerate())
        
    GameTooltip:AddLine(date("%A, %d %B, %Y"), 1, 1, 1)
    GameTooltip:AddDoubleLine("Framerate:", format("%.1f fps", GetFramerate()), color.r, color.g, color.b, fpscolor.r, fpscolor.g, fpscolor.b)
    GameTooltip:AddDoubleLine("Latency:", format("%d ms", select(3, GetNetStats())), color.r, color.g, color.b, latencycolor.r, latencycolor.g, latencycolor.b)
    GameTooltip:AddDoubleLine("System Uptime:", TimeFormat(GetTime()), color.r, color.g, color.b, 1, 1, 1)
    GameTooltip:AddDoubleLine(". . . . . . . . . . .", ". . . . . . . . . . .", 1, 1, 1, 1, 1, 1)
    
    addons = {}
    total = 0
    UpdateAddOnMemoryUsage()
    for i = 1, GetNumAddOns(), 1 do
        if GetAddOnMemoryUsage(i) > 0 then
            memory = GetAddOnMemoryUsage(i)
            entry = {name = GetAddOnInfo(i), memory = memory}
            table.insert(addons, entry)
            total = total + memory
        end
    end
    
    table.sort(addons, Addoncompare)
 
    i = 0
    for _,entry in pairs(addons) do
        local cr, cg, cb = ColorGradient((entry.memory / 800), 0, 1, 0, 1, 1, 0, 1, 0, 0)
        GameTooltip:AddDoubleLine(entry.name, MemFormat(entry.memory), 1, 1, 1, cr, cg, cb)
    
        i = i + 1
        if i >= AddonNumb then
            break
        end     
    end
    
    local cr, cg, cb = ColorGradient((entry.memory / 800), 0, 1, 0, 1, 1, 0, 1, 0, 0) 
    GameTooltip:AddDoubleLine(". . . . . . . . . . .", ". . . . . . . . . . .", 1, 1, 1, 1, 1, 1)
    GameTooltip:AddDoubleLine("Total", MemFormat(total), color.r, color.g, color.b, cr, cg, cb)
    GameTooltip:AddDoubleLine("..with Blizzard", MemFormat(collectgarbage("count")), color.r, color.g, color.b, cr, cg, cb)
    GameTooltip:Show()
end)
 
FLMframe:SetScript("OnLeave", function() 
    GameTooltip:Hide() 
end)
 
    --========[ mem cleanup ]========--
FLMframe:SetScript("OnClick", function()
    if (not IsAltKeyDown()) then
        UpdateAddOnMemoryUsage()
        local memBefore = gcinfo()
        collectgarbage()
        UpdateAddOnMemoryUsage()
        local memAfter = gcinfo()
        DEFAULT_CHAT_FRAME:AddMessage("Memory cleaned: |cff00FF00"..MemFormat(memBefore - memAfter))
    end
end)
    
end
    
---------------------
-- hide some stuff --
---------------------
MinimapBackdrop:Hide()
MinimapBorder:Hide()
MinimapBorderTop:Hide()
MinimapZoomIn:Show()
MinimapZoomOut:Show()
MiniMapVoiceChatFrame:Hide()
GameTimeFrame:Hide()
MinimapZoneTextButton:Show()
MiniMapTracking:Show()
MiniMapMailBorder:Hide()
MinimapNorthTag:SetAlpha(50)
MiniMapInstanceDifficulty:SetAlpha(50)
GuildInstanceDifficulty:SetAlpha(50)
 
if showclock then
    LoadAddOn('Blizzard_TimeManager')
    local clockFrame, clockTime = TimeManagerClockButton:GetRegions()
    clockFrame:Hide()
    clockTime:Show()
    clockTime:SetFont(font, fontSize, fontFlag)
    TimeManagerClockButton:SetPoint("BOTTOM", Minimap, 0, -6)
else
    LoadAddOn('Blizzard_TimeManager')
    TimeManagerClockButton.Show = TimeManagerClockButton.Hide
    local region = TimeManagerClockButton:GetRegions()
    region:Hide()   
    TimeManagerClockButton:ClearAllPoints() 
    TimeManagerClockButton:Hide()   
end
 
---------------------
-- move some stuff --
---------------------
if moveWatchFrame then
    WatchFrame:ClearAllPoints() 
    WatchFrame.ClearAllPoints = function() end
    WatchFrame:SetPoint(qanchor, qparent, qanchor, qposition_x, qposition_y)
    WatchFrame.SetPoint = function() end
    WatchFrame:SetClampedToScreen(true)
    WatchFrame:SetHeight(qheight)
end
 
MiniMapMailFrame:ClearAllPoints()
MiniMapMailFrame:SetPoint("TOPRIGHT", Minimap, 4, -20)
MiniMapMailIcon:SetTexture(mailicon)
 
MiniMapWorldMapButton:Hide()
MiniMapInstanceDifficulty:ClearAllPoints()
MiniMapInstanceDifficulty:SetParent(Minimap)
MiniMapInstanceDifficulty:SetPoint("TOPLEFT", Minimap, "TOPLEFT", 0, -22)
DropDownList1:SetClampedToScreen(true)
 
MiniMapMailFrame:SetFrameLevel(10)
MiniMapInstanceDifficulty:SetFrameLevel(10)
 
QueueStatusMinimapButton:SetSize(20, 20)
QueueStatusMinimapButton:ClearAllPoints()
QueueStatusMinimapButton:SetParent(Minimap)
QueueStatusMinimapButton:SetPoint("BOTTOMLEFT", Minimap, "BOTTOMLEFT", 0, 22)
QueueStatusMinimapButton:SetFrameLevel(10)
QueueStatusMinimapButtonBorder:Hide()
  
---------------------
-- mousewheel zoom --
---------------------
Minimap:EnableMouseWheel(true)
Minimap:SetScript("OnMouseWheel", function(self, direction)
    if(direction > 0) then
        Minimap_ZoomIn()
    else
        Minimap_ZoomOut()
    end
end)
  
------------------------
-- move and clickable --
------------------------
Minimap:SetMovable(true)
Minimap:SetUserPlaced(true)
Minimap:SetScript("OnMouseDown", function()
    if (IsAltKeyDown()) then
        Minimap:ClearAllPoints()
        Minimap:StartMoving()
    end
end)
 
Minimap:SetScript('OnMouseUp', function(self, button)
Minimap:StopMovingOrSizing()
    if (button == 'RightButton') then
        ToggleDropDownMenu(1, nil, MiniMapTrackingDropDown, self, - (Minimap:GetWidth() * 0.7), -3)
    elseif (button == 'MiddleButton') then
        ToggleCalendar()
    else
        Minimap_OnClick(self)
    end
end)
 
-- calendar slashcmd
SlashCmdList["CALENDAR"] = function()
    ToggleCalendar()
end
SLASH_CALENDAR1 = "/cl"
SLASH_CALENDAR2 = "/calendar"
 
function GetMinimapShape() return 'SQUARE' end
 
-------------------
-- combat fading --
-------------------
if enableCombatFade then
function Minimap_OnEvent(self, event)
        if event == "PLAYER_REGEN_DISABLED" then
            MinimapCluster:SetAlpha(inCombatAlpha)
            if useInfoPanel then    
                FLMframe:SetAlpha(inCombatAlpha)
            end
        elseif event == "PLAYER_REGEN_ENABLED" then
            MinimapCluster:SetAlpha(outCombatAlpha)
            if useInfoPanel then    
                FLMframe:SetAlpha(outCombatAlpha)
            end     
        end
end
    
Minimap:HookScript("OnEvent", Minimap_OnEvent)
 
Minimap:RegisterEvent("PLAYER_REGEN_DISABLED")
Minimap:RegisterEvent("PLAYER_REGEN_ENABLED")
end
 
-------------------------------
-- style Battlefield Minimap --
-------------------------------
local function hide(f)
    f:SetTexture()
    f.SetTexture = function() end
end
 
hooksecurefunc("LoadAddOn", function(addon)
    if addon ~= "Blizzard_BattlefieldMinimap" then return end
 
    BattlefieldMinimapBackground:Hide()
    BattlefieldMinimapCorner:Hide()
    BattlefieldMinimapCloseButton:Hide()
    BattlefieldMinimapTab:Hide()
    
    BBorderFrame = CreateFrame("Frame", nil, BattlefieldMinimap)
    BBorderFrame:SetPoint("TOPLEFT", BattlefieldMinimap, "TOPLEFT", -1, 1)
    BBorderFrame:SetPoint("BOTTOMRIGHT", BattlefieldMinimap, "BOTTOMRIGHT", -5, 3)  
    BBorderFrame:SetBackdrop(backdrop)
    if not classColoredBorder then
        BBorderFrame:SetBackdropBorderColor(unpack(brdcolor))
    else
        BBorderFrame:SetBackdropBorderColor(color.r, color.g, color.b)
    end 
    BBorderFrame:SetBackdropColor(unpack(backdropcolor))
    BBorderFrame:SetFrameLevel(6)       
end)

I used the dRecMap add-on. There's a folder named dMedia to add your tga file in. I used the size 256-128 for the mask with a Width 200-Height 100 rectangle in the middle but I'm also going to try a 128-256. At first it was showing up green for the size 128-256 so I thought I couldn't use it. You need to exit fully out and back on first for it to register the size.

I'm getting really close making it work after countless hours messing with the settings. The only part getting in my way now is trying to make a hidden minimap circle small enough to where the border touches the edges of the rectangle. Least that's what it seems like.