Migrate spelling-0.0.19 changes from main

```c++
    auto nativePanel2 = panel.try_as<ISwapChainPanelNative2>();
```

keeps failing in the server, but succeeding in the window process. This doesn't make any sense to me.

.github/actions/spell-check/advice.txt

@@ -1,25 +0,0 @@
-<details>
-<summary>
-:pencil2: Contributor please read this
-</summary>
-
-By default the command suggestion will generate a file named based on your commit. That's generally ok as long as you add the file to your commit. Someone can reorganize it later.
-
-:warning: The command is written for posix shells. You can copy the contents of each `perl` command excluding the outer `'` marks and dropping any `'"`/`"'` quotation mark pairs into a file and then run `perl file.pl` from the root of the repository to run the code. Alternatively, you can manually insert the items...
-
-If the listed items are:
-* ... **misspelled**, then please *correct* them instead of using the command.
-* ... *names*, please add them to `.github/actions/spell-check/dictionary/names.txt`.
-* ... APIs, you can add them to a file in `.github/actions/spell-check/dictionary/`.
-* ... just things you're using, please add them to an appropriate file in `.github/actions/spell-check/expect/`.
-* ... tokens you only need in one place and shouldn't *generally be used*, you can add an item in an appropriate file in `.github/actions/spell-check/patterns/`.
-
-See the `README.md` in each directory for more information.
-
-:microscope: You can test your commits **without** *appending* to a PR by creating a new branch with that extra change and pushing it to your fork. The [:check-spelling](https://github.com/marketplace/actions/check-spelling) action will run in response to your **push** -- it doesn't require an open pull request. By using such a branch, you can limit the number of typos your peers see you make. :wink:
-
-</details>
-
-#### :warning: Reviewers
-At present, the action that triggered this message will not show its :x: in this PR unless the branch is within this repository.
-Thus, you **should** make sure that this comment has been addressed before encouraging the merge bot to merge this PR.

.github/actions/spell-check/dictionary/apis.txt

@@ -1,45 +0,0 @@
-ACCEPTFILES
-ACCESSDENIED
-alignof
-bitfield
-bitfields
-CLASSNOTAVAILABLE
-EXPCMDFLAGS
-EXPCMDSTATE
-fullkbd
-futex
-href
-IAsync
-IBind
-IBox
-IClass
-IComparable
-ICustom
-IDialog
-IDirect
-IExplorer
-IMap
-IObject
-IStorage
-llabs
-LCID
-LSHIFT
-NCHITTEST
-NCLBUTTONDBLCLK
-NCRBUTTONDBLCLK
-NOAGGREGATION
-NOREDIRECTIONBITMAP
-oaidl
-ocidl
-PAGESCROLL
-RETURNCMD
-rfind
-roundf
-RSHIFT
-rx
-SIZENS
-spsc
-STDCPP
-syscall
-tmp
-tx

.github/actions/spell-check/dictionary/math.txt

@@ -1,3 +0,0 @@
-powf
-sqrtf
-isnan

.github/actions/spell-check/dictionary/microsoft.txt

@@ -1,18 +0,0 @@
-ACLs
-altform
-backplating
-DACL
-DACLs
-LKG
-mfcribbon
-microsoft
-microsoftonline
-osgvsowi
-powerrename
-powershell
-pscustomobject
-SACLs
-tdbuildteamid
-vcruntime
-visualstudio
-wslpath

.github/actions/spelling/advice.md

@@ -0,0 +1,50 @@
+<!-- markdownlint-disable MD033 MD041 -->
+<details>
+<summary>
+:pencil2: Contributor please read this
+</summary>
+
+By default the command suggestion will generate a file named based on your commit. That's generally ok as long as you add the file to your commit. Someone can reorganize it later.
+
+:warning: The command is written for posix shells. You can copy the contents of each `perl` command excluding the outer `'` marks and dropping any `'"`/`"'` quotation mark pairs into a file and then run `perl file.pl` from the root of the repository to run the code. Alternatively, you can manually insert the items...
+
+If the listed items are:
+
+* ... **misspelled**, then please *correct* them instead of using the command.
+* ... *names*, please add them to `.github/actions/spelling/allow/names.txt`.
+* ... APIs, you can add them to a file in `.github/actions/spelling/allow/`.
+* ... just things you're using, please add them to an appropriate file in `.github/actions/spelling/expect/`.
+* ... tokens you only need in one place and shouldn't *generally be used*, you can add an item in an appropriate file in `.github/actions/spelling/patterns/`.
+
+See the `README.md` in each directory for more information.
+
+:microscope: You can test your commits **without** *appending* to a PR by creating a new branch with that extra change and pushing it to your fork. The [check-spelling](https://github.com/marketplace/actions/check-spelling) action will run in response to your **push** -- it doesn't require an open pull request. By using such a branch, you can limit the number of typos your peers see you make. :wink:
+
+<details><summary>:clamp: If you see a bunch of garbage</summary>
+
+If it relates to a ...
+<details><summary>well-formed pattern</summary>
+
+See if there's a [pattern](https://github.com/check-spelling/check-spelling/wiki/Configuration-Examples:-patterns) that would match it.
+
+If not, try writing one and adding it to a `patterns/{file}.txt`.
+
+Patterns are Perl 5 Regular Expressions - you can [test](
+https://www.regexplanet.com/advanced/perl/) yours before committing to verify it will match your lines.
+
+Note that patterns can't match multiline strings.
+</details>
+<details><summary>binary-ish string</summary>
+
+Please add a file path to the `excludes.txt` file instead of just accepting the garbage.
+
+File paths are Perl 5 Regular Expressions - you can [test](
+https://www.regexplanet.com/advanced/perl/) yours before committing to verify it will match your files.
+
+`^` refers to the file's path from the root of the repository, so `^README\.md$` would exclude [README.md](
+../tree/HEAD/README.md) (on whichever branch you're using).
+</details>
+
+</details>
+
+</details>

.github/actions/spelling/allow/README.md

@@ -1,6 +1,6 @@
-# Dictionaries are lists of words to accept unconditionally
+# Allow files are lists of words to accept unconditionally
 
-While check spelling will complain about a whitelisted word
+While check spelling will complain about an expected word
 which is no longer present, you can include things here even if
 they are not otherwise present in the repository.
 
@@ -8,13 +8,14 @@ E.g., you could include a list of system APIs here, or potential
 contributors (so that if a future commit includes their name,
 it'll be accepted).
 
-### Files
+## Files
 
 | File | Description |
 | ---- | ----------- |
-| [Dictionary](dictionary.txt) | Primary US English dictionary |
+| [Allow](allow.txt) | Supplements to the dictionary |
 | [Chinese](chinese.txt) | Chinese words |
 | [Japanese](japanese.txt) | Japanese words |
 | [Microsoft](microsoft.txt) | Microsoft brand items |
 | [Fonts](fonts.txt) | Font names |
 | [Names](names.txt) | Names of people |
+| [Colors](colors.txt) | Names of color |

.github/actions/spelling/allow/allow.txt

@@ -0,0 +1,77 @@
+apc
+calt
+ccmp
+changelog
+cybersecurity
+Apc
+clickable
+clig
+copyable
+dalet
+dcs
+Dcs
+dialytika
+dje
+downside
+downsides
+dze
+dzhe
+Enum'd
+Fitt
+formattings
+ftp
+fvar
+geeksforgeeks
+ghe
+gje
+hostname
+hostnames
+hyperlink
+hyperlinking
+hyperlinks
+img
+It'd
+kje
+liga
+lje
+locl
+lorem
+Llast
+Lmid
+Lorigin
+maxed
+mkmk
+mru
+noreply
+nje
+ogonek
+ok'd
+overlined
+postmodern
+ptys
+qof
+qps
+rclt
+reimplementation
+reserialization
+reserialize
+reserializes
+rlig
+runtimes
+shcha
+slnt
+Sos
+timestamped
+TLDR
+tokenizes
+tonos
+tshe
+uiatextrange
+UIs
+und
+unregister
+versioned
+We'd
+wildcards
+yeru
+zhe

.github/actions/spelling/allow/apis.txt

@@ -0,0 +1,194 @@
+ACCEPTFILES
+ACCESSDENIED
+alignas
+alignof
+APPLYTOSUBMENUS
+bitfield
+bitfields
+BUILDBRANCH
+BUILDMSG
+BUILDNUMBER
+BYPOSITION
+charconv
+CLASSNOTAVAILABLE
+cmdletbinding
+COLORPROPERTY
+colspan
+COMDLG
+comparand
+cstdint
+CXICON
+CYICON
+dataobject
+dcomp
+DERR
+dlldata
+DONTADDTORECENT
+DWORDLONG
+enumset
+environstrings
+EXPCMDFLAGS
+EXPCMDSTATE
+filetime
+FILTERSPEC
+FORCEFILESYSTEM
+FORCEMINIMIZE
+frac
+fullkbd
+futex
+GETDESKWALLPAPER
+GETHIGHCONTRAST
+Hashtable
+HIGHCONTRASTON
+HIGHCONTRASTW
+hotkeys
+href
+hrgn
+IActivation
+IApp
+IAppearance
+IAsync
+IBind
+IBox
+IClass
+IComparable
+IComparer
+IConnection
+ICustom
+IDialog
+IDirect
+IExplorer
+IFACEMETHOD
+IFile
+IInheritable
+IMap
+IObject
+iosfwd
+IPackage
+IPeasant
+isspace
+ISetup
+IStorage
+istream
+IStringable
+ITab
+ITaskbar
+IUri
+IVirtual
+KEYSELECT
+LCID
+llabs
+llu
+localtime
+lround
+LSHIFT
+MENUCOMMAND
+MENUDATA
+MENUINFO
+memicmp
+mptt
+mov
+msappx
+MULTIPLEUSE
+NCHITTEST
+NCLBUTTONDBLCLK
+NCRBUTTONDBLCLK
+NIF
+NIN
+NOAGGREGATION
+NOASYNC
+NOCHANGEDIR
+NOPROGRESS
+NOREDIRECTIONBITMAP
+NOREPEAT
+NOTIFYBYPOS
+NOTIFYICON
+NOTIFYICONDATA
+ntprivapi
+oaidl
+ocidl
+ODR
+offsetof
+osver
+OSVERSIONINFOEXW
+otms
+OUTLINETEXTMETRICW
+overridable
+PAGESCROLL
+PICKFOLDERS
+pmr
+rcx
+REGCLS
+RETURNCMD
+rfind
+roundf
+RSHIFT
+schandle
+semver
+serializer
+SETVERSION
+SHELLEXECUTEINFOW
+shobjidl
+SHOWMINIMIZED
+SHOWTIP
+SINGLEUSE
+SIZENS
+smoothstep
+snprintf
+spsc
+sregex
+SRWLOC
+SRWLOCK
+STDCPP
+STDMETHOD
+strchr
+strcpy
+streambuf
+strtoul
+Stubless
+Subheader
+Subpage
+syscall
+TASKBARCREATED
+TBPF
+THEMECHANGED
+tlg
+tmp
+tolower
+toupper
+TTask
+TVal
+UChar
+UPDATEINIFILE
+userenv
+wcsstr
+wcstoui
+winmain
+wmemcmp
+wpc
+wsregex
+wwinmain
+xchg
+XDocument
+XElement
+xfacet
+xhash
+XIcon
+xiosbase
+xlocale
+xlocbuf
+xlocinfo
+xlocmes
+xlocmon
+xlocnum
+xloctime
+XMax
+xmemory
+XParse
+xpath
+xstddef
+xstring
+xtree
+xutility
+YIcon
+YMax

.github/actions/spelling/allow/colors.txt

@@ -0,0 +1,117 @@
+alice
+aliceblue
+antiquewhite
+blanchedalmond
+blueviolet
+burlywood
+cadetblue
+cornflowerblue
+cornsilk
+cyan
+darkblue
+darkcyan
+darkgoldenrod
+darkgray
+darkgreen
+darkgrey
+darkkhaki
+darkmagenta
+darkolivegreen
+darkorange
+darkorchid
+darkred
+darksalmon
+darkseagreen
+darkslateblue
+darkslategray
+darkslategrey
+darkturquoise
+darkviolet
+deeppink
+deepskyblue
+dimgray
+dimgrey
+dodgerblue
+firebrick
+floralwhite
+forestgreen
+gainsboro
+ghostwhite
+greenyellow
+hotpink
+indian
+indianred
+lavenderblush
+lawngreen
+lemonchiffon
+lightblue
+lightcoral
+lightcyan
+lightgoldenrod
+lightgoldenrodyellow
+lightgray
+lightgreen
+lightgrey
+lightpink
+lightsalmon
+lightseagreen
+lightskyblue
+lightslateblue
+lightslategray
+lightslategrey
+lightsteelblue
+lightyellow
+limegreen
+mediumaquamarine
+mediumblue
+mediumorchid
+mediumpurple
+mediumseagreen
+mediumslateblue
+mediumspringgreen
+mediumturquoise
+mediumvioletred
+midnightblue
+mintcream
+mistyrose
+navajo
+navajowhite
+navyblue
+oldlace
+olivedrab
+orangered
+palegoldenrod
+palegreen
+paleturquoise
+palevioletred
+papayawhip
+peachpuff
+peru
+powderblue
+rebecca
+rebeccapurple
+rosybrown
+royalblue
+saddlebrown
+sandybrown
+seagreen
+sienna
+skyblue
+slateblue
+slategray
+slategrey
+springgreen
+steelblue
+violetred
+webgray
+webgreen
+webgrey
+webmaroon
+webpurple
+whitesmoke
+xaroon
+xray
+xreen
+xrey
+xurple
+yellowgreen

.github/actions/spelling/allow/fonts.txt

@@ -1,8 +1,10 @@
 Consolas
 emoji
+emojis
 Extralight
 Gabriola
 Iosevka
 MDL
 Monofur
 Segoe
+wght

.github/actions/spelling/allow/math.txt

@@ -0,0 +1,11 @@
+atan
+CPrime
+HBar
+HPrime
+isnan
+LPrime
+LStep
+powf
+RSub
+sqrtf
+ULP

.github/actions/spelling/allow/microsoft.txt

@@ -0,0 +1,78 @@
+ACLs
+ADMINS
+advapi
+altform
+altforms
+appendwttlogging
+appx
+appxbundle
+appxerror
+appxmanifest
+ATL
+backplating
+bitmaps
+BOMs
+CPLs
+cpptools
+cppvsdbg
+CPRs
+cryptbase
+DACL
+DACLs
+diffs
+disposables
+dotnetfeed
+DTDs
+DWINRT
+enablewttlogging
+Intelli
+IVisual
+LKG
+LOCKFILE
+Lxss
+mfcribbon
+microsoft
+microsoftonline
+MSAA
+msixbundle
+MSVC
+muxc
+netcore
+osgvsowi
+PFILETIME
+pgc
+pgo
+pgosweep
+powerrename
+powershell
+propkey
+pscustomobject
+QWORD
+regedit
+robocopy
+SACLs
+sdkddkver
+Shobjidl
+Skype
+SRW
+sxs
+Sysinternals
+sysnative
+systemroot
+taskkill
+tasklist
+tdbuildteamid
+unvirtualized
+VCRT
+vcruntime
+Virtualization
+visualstudio
+vscode
+VSTHRD
+winsdkver
+wlk
+wslpath
+wtl
+wtt
+wttlog
+Xamarin

.github/actions/spelling/allow/names.txt

@@ -8,36 +8,52 @@ dhowett
 Diviness
 dsafa
 duhowett
+ekg
 ethanschoonover
 Firefox
 Gatta
+glsl
+Gravell
 Grie
 Griese
 Hernan
 Howett
 Illhardt
+iquilezles
 jantari
 jerrysh
 Kaiyu
 kimwalisch
 KMehrain
+KODELIFE
+Kodelife
 Kourosh
 kowalczyk
 leonmsft
 Lepilleur
+lhecker
+lukesampson
 Manandhar
 mbadolato
 Mehrain
+menger
 mgravell
 michaelniksa
+michkap
 migrie
 mikegr
 mikemaccana
+miloush
 miniksa
 niksa
+nvaccess
+nvda
 oising
 oldnewthing
+opengl
 osgwiki
+pabhojwa
+panos
 paulcam
 pauldotknopf
 PGP
@@ -45,11 +61,14 @@ Pham
 Rincewind
 rprichard
 Schoonover
+shadertoy
 Somuah
 sonph
 sonpham
 stakx
+thereses
 Walisch
+Wellons
 Wirt
 Wojciech
 zadjii

.github/actions/spelling/excludes.txt

@@ -1,3 +1,4 @@
+(?:(?i)\.png$)
 (?:^|/)dirs$
 (?:^|/)go\.mod$
 (?:^|/)go\.sum$
@@ -35,7 +36,6 @@ SUMS$
 \.pbxproj$
 \.pdf$
 \.pem$
-\.png$
 \.psd$
 \.runsettings$
 \.sig$
@@ -45,6 +45,7 @@ SUMS$
 \.tar$
 \.tgz$
 \.ttf$
+\.vsdx$
 \.woff
 \.xcf$
 \.xls
@@ -53,11 +54,26 @@ SUMS$
 \.zip$
 ^consolegit2gitfilters\.json$
 ^dep/
-^oss/
+^doc/reference/master-sequence-list.csv$
 ^doc/reference/UTF8-torture-test\.txt$
+^oss/
+^src/host/ft_uia/run\.bat$
+^src/host/runft\.bat$
+^src/host/runut\.bat$
 ^src/interactivity/onecore/BgfxEngine\.
 ^src/renderer/wddmcon/WddmConRenderer\.
+^src/terminal/adapter/ut_adapter/run\.bat$
+^src/terminal/parser/delfuzzpayload\.bat$
+^src/terminal/parser/ft_fuzzer/run\.bat$
 ^src/terminal/parser/ft_fuzzer/VTCommandFuzzer\.cpp$
+^src/terminal/parser/ft_fuzzwrapper/run\.bat$
+^src/terminal/parser/ut_parser/run\.bat$
+^src/tools/integrity/packageuwp/ConsoleUWP\.appxSources$
+^src/tools/lnkd/lnkd\.bat$
+^src/tools/pixels/pixels\.bat$
+^src/tools/texttests/fira\.txt$
 ^src/tools/U8U16Test/(?:fr|ru|zh)\.txt$
-^\.github/actions/spell-check/
+^src/types/ut_types/UtilsTests.cpp$
+^\.github/actions/spelling/
 ^\.gitignore$
+^\XamlStyler.json$

.github/actions/spelling/expect/alphabet.txt

@@ -1,15 +1,32 @@
+AAAa
+AAAAA
+AAAAAAAAAAAAA
+AAAAAABBBBBBCCC
+AAAAABBBBBBCCC
+abcd
+abcd
 abcde
 abcdef
 ABCDEFG
 ABCDEFGH
 ABCDEFGHIJ
 abcdefghijk
+ABCDEFGHIJKLMNO
 abcdefghijklmnop
 ABCDEFGHIJKLMNOPQRST
 abcdefghijklmnopqrstuvwxyz
+ABCG
 ABE
-BBGGRR
+abf
+BBBBB
+BBBBBBBB
 BBBBBBBBBBBBBBDDDD
+BBBBBCCC
+BBBBCCCCC
+BBGGRR
+CCE
+EFG
+EFGh
 QQQQQQQQQQABCDEFGHIJ
 QQQQQQQQQQABCDEFGHIJKLMNOPQRSTQQQQQQQQQ
 QQQQQQQQQQABCDEFGHIJKLMNOPQRSTQQQQQQQQQQ
@@ -28,3 +45,4 @@ ZYXWVUT
 ZZBBZ
 ZZZBB
 ZZZBZ
+ZZZZZ

.github/actions/spelling/expect/web.txt

@@ -1,6 +1,7 @@
 http
-td
 www
+easyrgb
+php
 ecma
 rapidtables
 WCAG
@@ -10,6 +11,9 @@ robertelder
 kovidgoyal
 leonerd
 fixterms
-uk
 winui
 appshellintegration
+mdtauk
+cppreference
+gfycat
+Guake

.github/actions/spelling/patterns/patterns.txt

@@ -4,7 +4,8 @@ https://www\.itscj\.ipsj\.or\.jp/iso-ir/[-0-9]+\.pdf
 https://www\.vt100\.net/docs/[-a-zA-Z0-9#_\/.]*
 https://www.w3.org/[-a-zA-Z0-9?&=\/_#]*
 https://(?:(?:www\.|)youtube\.com|youtu.be)/[-a-zA-Z0-9?&=]*
-https://[a-z-]+\.githubusercontent\.com/[-a-zA-Z0-9?&=_\/.]*
+https://(?:[a-z-]+\.|)github(?:usercontent|)\.com/[-a-zA-Z0-9?%&=_\/.]*
+https://www.xfree86.org/[-a-zA-Z0-9?&=\/_#]*
 [Pp]ublicKeyToken="?[0-9a-fA-F]{16}"?
 (?:[{"]|UniqueIdentifier>)[0-9a-fA-F]{8}-(?:[0-9a-fA-F]{4}-){3}[0-9a-fA-F]{12}(?:[}"]|</UniqueIdentifier)
 (?:0[Xx]|\\x|U\+|#)[a-f0-9A-FGgRr]{2,}[Uu]?[Ll]{0,2}\b
@@ -15,8 +16,12 @@ Scro\&ll
  :\\windows\\syste\b
 TestUtils::VerifyExpectedString\(tb, L"[^"]+"
 (?:hostSm|mach)\.ProcessString\(L"[^"]+"
-\b([A-Za-z])\1{3,}\b
+\b([A-Za-z])\g{-1}{3,}\b
+0x[0-9A-Za-z]+
 Base64::s_(?:En|De)code\(L"[^"]+"
 VERIFY_ARE_EQUAL\(L"[^"]+"
-L"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789\+/"
+"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789\+/"
 std::memory_order_[\w]+
+D2DERR_SHADER_COMPILE_FAILED
+TIL_FEATURE_[0-9A-Z_]+
+vcvars\w*

.github/actions/spelling/reject.txt

@@ -0,0 +1,22 @@
+^attache$
+^attacher$
+^attachers$
+^spae$
+^spaebook$
+^spaecraft$
+^spaed$
+^spaedom$
+^spaeing$
+^spaeings$
+^spae-man$
+^spaeman$
+^spaer$
+^Spaerobee$
+^spaes$
+^spaewife$
+^spaewoman$
+^spaework$
+^spaewright$
+^wether$
+^wethers$
+^wetherteg$

.github/workflows/spelling.yml

@@ -1,20 +0,0 @@
-name: Spell checking
-on:
-  push:
-  schedule:
-    # * is a special character in YAML so you have to quote this string
-    - cron: '15 * * * *'
-
-jobs:
-  build:
-    name: Spell checking
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v2.0.0
-      with:
-        fetch-depth: 5
-    - uses: check-spelling/check-spelling@0.0.16-alpha
-      env:
-        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        bucket: .github/actions
-        project: spell-check

.github/workflows/spelling2.yml

@@ -0,0 +1,20 @@
+# spelling.yml is blocked per https://github.com/check-spelling/check-spelling/security/advisories/GHSA-g86g-chm8-7r2p
+name: Spell checking
+on:
+  pull_request_target:
+  push:
+
+jobs:
+  spelling:
+    name: Spell checking
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout-merge
+      if: "contains(github.event_name, 'pull_request')"
+      uses: actions/checkout@v2
+      with:
+        ref: refs/pull/${{github.event.pull_request.number}}/merge
+    - name: checkout
+      if: "!contains(github.event_name, 'pull_request')"
+      uses: actions/checkout@v2
+    - uses: check-spelling/check-spelling@v0.0.19

OpenConsole.sln

@@ -87,8 +87,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "Host.Tests.Feature", "src\h
 	ProjectSection(ProjectDependencies) = postProject
 		{18D09A24-8240-42D6-8CB6-236EEE820263} = {18D09A24-8240-42D6-8CB6-236EEE820263}
 		{FC802440-AD6A-4919-8F2C-7701F2B38D79} = {FC802440-AD6A-4919-8F2C-7701F2B38D79}
-		{9CBD7DFA-1754-4A9D-93D7-857A9D17CB1B} = {9CBD7DFA-1754-4A9D-93D7-857A9D17CB1B}
 		{58A03BB2-DF5A-4B66-91A0-7EF3BA01269A} = {58A03BB2-DF5A-4B66-91A0-7EF3BA01269A}
+		{9CBD7DFA-1754-4A9D-93D7-857A9D17CB1B} = {9CBD7DFA-1754-4A9D-93D7-857A9D17CB1B}
 	EndProjectSection
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "TerminalParser.UnitTests", "src\terminal\parser\ut_parser\Parser.UnitTests.vcxproj", "{12144E07-FE63-4D33-9231-748B8D8C3792}"
@@ -314,6 +314,19 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "WpfTerminalTestNetCore", "s
 		{84848BFA-931D-42CE-9ADF-01EE54DE7890} = {84848BFA-931D-42CE-9ADF-01EE54DE7890}
 	EndProjectSection
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "ScratchWinRTServer", "src\tools\ScratchWinRTServer\ScratchWinRTServer.vcxproj", "{D46D9547-F085-4645-B8F7-E8CD21559AB4}"
+	ProjectSection(ProjectDependencies) = postProject
+		{CA5CAD1A-C46D-4588-B1C0-40F31AE9100B} = {CA5CAD1A-C46D-4588-B1C0-40F31AE9100B}
+		{CA5CAD1A-ABCD-429C-B551-8562EC954746} = {CA5CAD1A-ABCD-429C-B551-8562EC954746}
+		{CA5CAD1A-D7EC-4107-B7C6-79CB77AE2907} = {CA5CAD1A-D7EC-4107-B7C6-79CB77AE2907}
+		{48D21369-3D7B-4431-9967-24E81292CF62} = {48D21369-3D7B-4431-9967-24E81292CF62}
+	EndProjectSection
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "ScratchIsland", "src\tools\ScratchIsland\ScratchIsland.vcxproj", "{23A1F736-CD19-4196-980F-84BCD50CF783}"
+	ProjectSection(ProjectDependencies) = postProject
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4} = {D46D9547-F085-4645-B8F7-E8CD21559AB4}
+	EndProjectSection
+EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "wt", "src\cascadia\wt\wt.vcxproj", "{506FD703-BAA7-4F6E-9361-64F550EC8FCA}"
 EndProject
 Global
@@ -1997,6 +2010,90 @@ Global
 		{1588FD7C-241E-4E7D-9113-43735F3E6BAD}.Release|DotNet_x86Test.Build.0 = Release|x86
 		{1588FD7C-241E-4E7D-9113-43735F3E6BAD}.Release|x64.ActiveCfg = Release|Any CPU
 		{1588FD7C-241E-4E7D-9113-43735F3E6BAD}.Release|x86.ActiveCfg = Release|Any CPU
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.AuditMode|Any CPU.ActiveCfg = Release|x64
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.AuditMode|Any CPU.Build.0 = Release|x64
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.AuditMode|ARM64.ActiveCfg = Release|x64
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.AuditMode|ARM64.Build.0 = Release|x64
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.AuditMode|DotNet_x64Test.ActiveCfg = Release|x64
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.AuditMode|DotNet_x64Test.Build.0 = Release|x64
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.AuditMode|DotNet_x86Test.ActiveCfg = Release|x64
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.AuditMode|DotNet_x86Test.Build.0 = Release|x64
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.AuditMode|x64.ActiveCfg = Release|x64
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.AuditMode|x64.Build.0 = Release|x64
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.AuditMode|x86.ActiveCfg = Release|Win32
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.AuditMode|x86.Build.0 = Release|Win32
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.Debug|Any CPU.ActiveCfg = Debug|Win32
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.Debug|ARM64.ActiveCfg = Debug|Win32
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.Debug|DotNet_x64Test.ActiveCfg = Debug|Win32
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.Debug|DotNet_x86Test.ActiveCfg = Debug|Win32
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.Debug|x64.ActiveCfg = Debug|x64
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.Debug|x64.Build.0 = Debug|x64
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.Debug|x86.ActiveCfg = Debug|Win32
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.Debug|x86.Build.0 = Debug|Win32
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.Release|Any CPU.ActiveCfg = Release|Win32
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.Release|ARM64.ActiveCfg = Release|Win32
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.Release|DotNet_x64Test.ActiveCfg = Release|Win32
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.Release|DotNet_x86Test.ActiveCfg = Release|Win32
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.Release|x64.ActiveCfg = Release|x64
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.Release|x64.Build.0 = Release|x64
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.Release|x86.ActiveCfg = Release|Win32
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4}.Release|x86.Build.0 = Release|Win32
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.AuditMode|Any CPU.ActiveCfg = Release|x64
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.AuditMode|Any CPU.Build.0 = Release|x64
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.AuditMode|ARM64.ActiveCfg = Release|x64
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.AuditMode|ARM64.Build.0 = Release|x64
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.AuditMode|DotNet_x64Test.ActiveCfg = Release|x64
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.AuditMode|DotNet_x64Test.Build.0 = Release|x64
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.AuditMode|DotNet_x86Test.ActiveCfg = Release|x64
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.AuditMode|DotNet_x86Test.Build.0 = Release|x64
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.AuditMode|x64.ActiveCfg = Release|x64
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.AuditMode|x64.Build.0 = Release|x64
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.AuditMode|x86.ActiveCfg = Release|Win32
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.AuditMode|x86.Build.0 = Release|Win32
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.Debug|Any CPU.ActiveCfg = Debug|Win32
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.Debug|ARM64.ActiveCfg = Debug|Win32
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.Debug|DotNet_x64Test.ActiveCfg = Debug|Win32
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.Debug|DotNet_x86Test.ActiveCfg = Debug|Win32
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.Debug|x64.ActiveCfg = Debug|x64
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.Debug|x64.Build.0 = Debug|x64
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.Debug|x86.ActiveCfg = Debug|Win32
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.Debug|x86.Build.0 = Debug|Win32
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.Release|Any CPU.ActiveCfg = Release|Win32
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.Release|ARM64.ActiveCfg = Release|Win32
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.Release|DotNet_x64Test.ActiveCfg = Release|Win32
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.Release|DotNet_x86Test.ActiveCfg = Release|Win32
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.Release|x64.ActiveCfg = Release|x64
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.Release|x64.Build.0 = Release|x64
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.Release|x86.ActiveCfg = Release|Win32
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092}.Release|x86.Build.0 = Release|Win32
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.AuditMode|Any CPU.ActiveCfg = Release|x64
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.AuditMode|Any CPU.Build.0 = Release|x64
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.AuditMode|ARM64.ActiveCfg = Release|x64
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.AuditMode|ARM64.Build.0 = Release|x64
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.AuditMode|DotNet_x64Test.ActiveCfg = Release|x64
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.AuditMode|DotNet_x64Test.Build.0 = Release|x64
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.AuditMode|DotNet_x86Test.ActiveCfg = Release|x64
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.AuditMode|DotNet_x86Test.Build.0 = Release|x64
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.AuditMode|x64.ActiveCfg = Release|x64
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.AuditMode|x64.Build.0 = Release|x64
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.AuditMode|x86.ActiveCfg = Release|Win32
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.AuditMode|x86.Build.0 = Release|Win32
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.Debug|Any CPU.ActiveCfg = Debug|Win32
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.Debug|ARM64.ActiveCfg = Debug|Win32
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.Debug|DotNet_x64Test.ActiveCfg = Debug|Win32
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.Debug|DotNet_x86Test.ActiveCfg = Debug|Win32
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.Debug|x64.ActiveCfg = Debug|x64
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.Debug|x64.Build.0 = Debug|x64
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.Debug|x86.ActiveCfg = Debug|Win32
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.Debug|x86.Build.0 = Debug|Win32
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.Release|Any CPU.ActiveCfg = Release|Win32
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.Release|ARM64.ActiveCfg = Release|Win32
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.Release|DotNet_x64Test.ActiveCfg = Release|Win32
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.Release|DotNet_x86Test.ActiveCfg = Release|Win32
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.Release|x64.ActiveCfg = Release|x64
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.Release|x64.Build.0 = Release|x64
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.Release|x86.ActiveCfg = Release|Win32
+		{23A1F736-CD19-4196-980F-84BCD50CF783}.Release|x86.Build.0 = Release|Win32
 		{506FD703-BAA7-4F6E-9361-64F550EC8FCA}.AuditMode|Any CPU.ActiveCfg = AuditMode|Win32
 		{506FD703-BAA7-4F6E-9361-64F550EC8FCA}.AuditMode|ARM64.ActiveCfg = AuditMode|ARM64
 		{506FD703-BAA7-4F6E-9361-64F550EC8FCA}.AuditMode|ARM64.Build.0 = AuditMode|ARM64
@@ -2104,6 +2201,9 @@ Global
 		{067F0A06-FCB7-472C-96E9-B03B54E8E18D} = {59840756-302F-44DF-AA47-441A9D673202}
 		{6BAE5851-50D5-4934-8D5E-30361A8A40F3} = {81C352DB-1818-45B7-A284-18E259F1CC87}
 		{1588FD7C-241E-4E7D-9113-43735F3E6BAD} = {59840756-302F-44DF-AA47-441A9D673202}
+		{D46D9547-F085-4645-B8F7-E8CD21559AB4} = {A10C4720-DCA4-4640-9749-67F4314F527C}
+		{06382349-D62A-4C7D-A7D3-9CA817EAE092} = {A10C4720-DCA4-4640-9749-67F4314F527C}
+		{23A1F736-CD19-4196-980F-84BCD50CF783} = {A10C4720-DCA4-4640-9749-67F4314F527C}
 		{506FD703-BAA7-4F6E-9361-64F550EC8FCA} = {59840756-302F-44DF-AA47-441A9D673202}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution

src/cascadia/TerminalControl/TermControl.cpp

@@ -555,21 +555,21 @@ namespace winrt::Microsoft::Terminal::TerminalControl::implementation
         // This event is only registered during terminal initialization,
         // so we don't need to check _initializedTerminal.
         // We also don't lock for things that come back from the renderer.
-        auto chain = _renderEngine->GetSwapChain();
+        auto chainHandle = _renderEngine->GetSwapChainHandle();
         auto weakThis{ get_weak() };
 
         co_await winrt::resume_foreground(Dispatcher());
 
         if (auto control{ weakThis.get() })
         {
-            _AttachDxgiSwapChainToXaml(chain.Get());
+            _AttachDxgiSwapChainToXaml(chainHandle);
         }
     }
 
-    void TermControl::_AttachDxgiSwapChainToXaml(IDXGISwapChain1* swapChain)
+    void TermControl::_AttachDxgiSwapChainToXaml(HANDLE swapChainHandle)
     {
-        auto nativePanel = SwapChainPanel().as<ISwapChainPanelNative>();
-        nativePanel->SetSwapChain(swapChain);
+        auto nativePanel = SwapChainPanel().as<ISwapChainPanelNative2>();
+        nativePanel->SetSwapChainHandle(swapChainHandle);
     }
 
     bool TermControl::_InitializeTerminal()
@@ -673,7 +673,7 @@ namespace winrt::Microsoft::Terminal::TerminalControl::implementation
             THROW_IF_FAILED(dxEngine->Enable());
             _renderEngine = std::move(dxEngine);
 
-            _AttachDxgiSwapChainToXaml(_renderEngine->GetSwapChain().Get());
+            _AttachDxgiSwapChainToXaml(_renderEngine->GetSwapChainHandle());
 
             // Tell the DX Engine to notify us when the swap chain changes.
             // We do this after we initially set the swapchain so as to avoid unnecessary callbacks (and locking problems)

src/cascadia/TerminalControl/TermControl.h

@@ -81,7 +81,7 @@ namespace winrt::Microsoft::Terminal::TerminalControl::implementation
         void ToggleRetroEffect();
 
         winrt::fire_and_forget RenderEngineSwapChainChanged();
-        void _AttachDxgiSwapChainToXaml(IDXGISwapChain1* swapChain);
+        void _AttachDxgiSwapChainToXaml(HANDLE swapChainHandle);
         winrt::fire_and_forget _RendererEnteredErrorState();
         void _RenderRetryButton_Click(IInspectable const& button, IInspectable const& args);
 

src/cascadia/WindowsTerminal/main.cpp

@@ -107,62 +107,68 @@ int __stdcall wWinMain(HINSTANCE, HINSTANCE, LPWSTR, int)
     // Make sure to call this so we get WM_POINTER messages.
     EnableMouseInPointer(true);
 
-    // !!! LOAD BEARING !!!
-    // We must initialize the main thread as a single-threaded apartment before
-    // constructing any Xaml objects. Failing to do so will cause some issues
-    // in accessibility somewhere down the line when a UIAutomation object will
-    // be queried on the wrong thread at the wrong time.
-    // We used to initialize as STA only _after_ initializing the application
-    // host, which loaded the settings. The settings needed to be loaded in MTA
-    // because we were using the Windows.Storage APIs. Since we're no longer
-    // doing that, we can safely init as STA before any WinRT dispatches.
-    winrt::init_apartment(winrt::apartment_type::single_threaded);
+    auto mainLoop = []() {
+        // !!! LOAD BEARING !!!
+        // We must initialize the main thread as a single-threaded apartment before
+        // constructing any Xaml objects. Failing to do so will cause some issues
+        // in accessibility somewhere down the line when a UIAutomation object will
+        // be queried on the wrong thread at the wrong time.
+        // We used to initialize as STA only _after_ initializing the application
+        // host, which loaded the settings. The settings needed to be loaded in MTA
+        // because we were using the Windows.Storage APIs. Since we're no longer
+        // doing that, we can safely init as STA before any WinRT dispatches.
+        winrt::init_apartment(winrt::apartment_type::single_threaded);
 
-    // Create the AppHost object, which will create both the window and the
-    // Terminal App. This MUST BE constructed before the Xaml manager as TermApp
-    // provides an implementation of Windows.UI.Xaml.Application.
-    AppHost host;
+        // Create the AppHost object, which will create both the window and the
+        // Terminal App. This MUST BE constructed before the Xaml manager as TermApp
+        // provides an implementation of Windows.UI.Xaml.Application.
+        AppHost host;
 
-    // Initialize the xaml content. This must be called AFTER the
-    // WindowsXamlManager is initialized.
-    host.Initialize();
+        // Initialize the xaml content. This must be called AFTER the
+        // WindowsXamlManager is initialized.
+        host.Initialize();
 
-    MSG message;
+        MSG message;
 
-    while (GetMessage(&message, nullptr, 0, 0))
-    {
-        // GH#638 (Pressing F7 brings up both the history AND a caret browsing message)
-        // The Xaml input stack doesn't allow an application to suppress the "caret browsing"
-        // dialog experience triggered when you press F7. Official recommendation from the Xaml
-        // team is to catch F7 before we hand it off.
-        // AppLogic contains an ad-hoc implementation of event bubbling for a runtime classes
-        // implementing a custom IF7Listener interface.
-        // If the recipient of IF7Listener::OnF7Pressed suggests that the F7 press has, in fact,
-        // been handled we can discard the message before we even translate it.
-        if (_messageIsF7Keypress(message))
+        while (GetMessage(&message, nullptr, 0, 0))
         {
-            if (host.OnDirectKeyEvent(VK_F7, true))
+            // GH#638 (Pressing F7 brings up both the history AND a caret browsing message)
+            // The Xaml input stack doesn't allow an application to suppress the "caret browsing"
+            // dialog experience triggered when you press F7. Official recommendation from the Xaml
+            // team is to catch F7 before we hand it off.
+            // AppLogic contains an ad-hoc implementation of event bubbling for a runtime classes
+            // implementing a custom IF7Listener interface.
+            // If the recipient of IF7Listener::OnF7Pressed suggests that the F7 press has, in fact,
+            // been handled we can discard the message before we even translate it.
+            if (_messageIsF7Keypress(message))
             {
-                // The application consumed the F7. Don't let Xaml get it.
-                continue;
+                if (host.OnDirectKeyEvent(VK_F7, true))
+                {
+                    // The application consumed the F7. Don't let Xaml get it.
+                    continue;
+                }
             }
-        }
 
-        // GH#6421 - System XAML will never send an Alt KeyUp event. So, similar
-        // to how we'll steal the F7 KeyDown above, we'll steal the Alt KeyUp
-        // here, and plumb it through.
-        if (_messageIsAltKeyup(message))
-        {
-            // Let's pass <Alt> to the application
-            if (host.OnDirectKeyEvent(VK_MENU, false))
+            // GH#6421 - System XAML will never send an Alt KeyUp event. So, similar
+            // to how we'll steal the F7 KeyDown above, we'll steal the Alt KeyUp
+            // here, and plumb it through.
+            if (_messageIsAltKeyup(message))
             {
-                // The application consumed the Alt. Don't let Xaml get it.
-                continue;
+                // Let's pass <Alt> to the application
+                if (host.OnDirectKeyEvent(VK_MENU, false))
+                {
+                    // The application consumed the Alt. Don't let Xaml get it.
+                    continue;
+                }
             }
-        }
 
-        TranslateMessage(&message);
-        DispatchMessage(&message);
-    }
+            TranslateMessage(&message);
+            DispatchMessage(&message);
+        }
+    };
+
+    std::thread t{ mainLoop };
+    mainLoop();
+
     return 0;
 }

src/common.build.post.props

@@ -13,7 +13,7 @@
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
     </ClCompile>
     <Link>
-      <AdditionalDependencies>onecoreuap_apiset.lib;d3dcompiler.lib;dwmapi.lib;uxtheme.lib;shlwapi.lib;ntdll.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>onecoreuap_apiset.lib;d3dcompiler.lib;dwmapi.lib;uxtheme.lib;shlwapi.lib;ntdll.lib;dcomp.lib;%(AdditionalDependencies)</AdditionalDependencies>
     </Link>
   </ItemDefinitionGroup>
 

src/renderer/dx/DxRenderer.cpp

@@ -84,6 +84,7 @@ DxEngine::DxEngine() :
     _glyphCell{},
     _boxDrawingEffect{},
     _haveDeviceResources{ false },
+    _swapChainHandle{ INVALID_HANDLE_VALUE },
     _swapChainDesc{ 0 },
     _swapChainFrameLatencyWaitableObject{ INVALID_HANDLE_VALUE },
     _recreateDeviceRequested{ false },
@@ -488,6 +489,13 @@ try
         }
         case SwapChainMode::ForComposition:
         {
+            if (!_swapChainHandle)
+            {
+                RETURN_IF_FAILED(DCompositionCreateSurfaceHandle(GENERIC_ALL, nullptr, &_swapChainHandle));
+            }
+
+            RETURN_IF_FAILED(_dxgiFactory2.As(&_dxgiFactoryMedia));
+
             // Use the given target size for compositions.
             _swapChainDesc.Width = _displaySizePixels.width<UINT>();
             _swapChainDesc.Height = _displaySizePixels.height<UINT>();
@@ -497,10 +505,11 @@ try
             // It's 100% required to use scaling mode stretch for composition. There is no other choice.
             _swapChainDesc.Scaling = DXGI_SCALING_STRETCH;
 
-            RETURN_IF_FAILED(_dxgiFactory2->CreateSwapChainForComposition(_d3dDevice.Get(),
-                                                                          &_swapChainDesc,
-                                                                          nullptr,
-                                                                          &_dxgiSwapChain));
+            RETURN_IF_FAILED(_dxgiFactoryMedia->CreateSwapChainForCompositionSurfaceHandle(_d3dDevice.Get(),
+                                                                                           _swapChainHandle.get(),
+                                                                                           &_swapChainDesc,
+                                                                                           nullptr,
+                                                                                           &_dxgiSwapChain));
             break;
         }
         default:
@@ -826,14 +835,14 @@ try
 }
 CATCH_LOG()
 
-Microsoft::WRL::ComPtr<IDXGISwapChain1> DxEngine::GetSwapChain()
+HANDLE DxEngine::GetSwapChainHandle()
 {
-    if (_dxgiSwapChain.Get() == nullptr)
+    if (!_swapChainHandle)
     {
         THROW_IF_FAILED(_CreateDeviceResources(true));
     }
 
-    return _dxgiSwapChain;
+    return _swapChainHandle.get();
 }
 
 void DxEngine::_InvalidateRectangle(const til::rectangle& rc)

src/renderer/dx/DxRenderer.hpp

@@ -63,7 +63,7 @@ namespace Microsoft::Console::Render
 
         void SetSoftwareRendering(bool enable) noexcept;
 
-        ::Microsoft::WRL::ComPtr<IDXGISwapChain1> GetSwapChain();
+        HANDLE GetSwapChainHandle();
 
         // IRenderEngine Members
         [[nodiscard]] HRESULT Invalidate(const SMALL_RECT* const psrRegion) noexcept override;
@@ -118,6 +118,8 @@ namespace Microsoft::Console::Render
         void SetAntialiasingMode(const D2D1_TEXT_ANTIALIAS_MODE antialiasingMode) noexcept;
         void SetDefaultTextBackgroundOpacity(const float opacity) noexcept;
 
+        wil::unique_handle _swapChainHandle;
+
     protected:
         [[nodiscard]] HRESULT _DoUpdateTitle(_In_ const std::wstring& newTitle) noexcept override;
         [[nodiscard]] HRESULT _PaintTerminalEffects() noexcept;
@@ -191,6 +193,7 @@ namespace Microsoft::Console::Render
         ::Microsoft::WRL::ComPtr<ID2D1SolidColorBrush> _d2dBrushBackground;
 
         ::Microsoft::WRL::ComPtr<IDXGIFactory2> _dxgiFactory2;
+        ::Microsoft::WRL::ComPtr<IDXGIFactoryMedia> _dxgiFactoryMedia;
         ::Microsoft::WRL::ComPtr<IDXGIDevice> _dxgiDevice;
         ::Microsoft::WRL::ComPtr<IDXGISurface> _dxgiSurface;
 

src/renderer/dx/precomp.h

@@ -21,6 +21,8 @@
 #include <typeinfo>
 #include <stdexcept>
 
+#include <dcomp.h>
+
 #include <dxgi.h>
 #include <dxgi1_2.h>
 #include <dxgi1_3.h>

src/tools/ScratchIsland/AppHost.cpp

@@ -0,0 +1,281 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
+#include "pch.h"
+#include "AppHost.h"
+#include "../types/inc/Viewport.hpp"
+#include "../types/inc/utils.hpp"
+#include "../types/inc/User32Utils.hpp"
+
+#include "resource.h"
+
+using namespace winrt::Windows::UI;
+using namespace winrt::Windows::UI::Composition;
+using namespace winrt::Windows::UI::Xaml;
+using namespace winrt::Windows::UI::Xaml::Controls;
+using namespace winrt::Windows::UI::Xaml::Hosting;
+using namespace winrt::Windows::Foundation::Numerics;
+using namespace ::Microsoft::Console;
+using namespace ::Microsoft::Console::Types;
+
+AppHost::AppHost() noexcept :
+    _window{ nullptr }
+{
+    _window = std::make_unique<IslandWindow>();
+
+    // Tell the window to callback to us when it's about to handle a WM_CREATE
+    auto pfn = std::bind(&AppHost::_HandleCreateWindow,
+                         this,
+                         std::placeholders::_1,
+                         std::placeholders::_2);
+    _window->SetCreateCallback(pfn);
+
+    _window->MakeWindow();
+}
+
+AppHost::~AppHost()
+{
+    // destruction order is important for proper teardown here
+    _window = nullptr;
+}
+
+// Method Description:
+// - Initializes the XAML island, creates the terminal app, and sets the
+//   island's content to that of the terminal app's content. Also registers some
+//   callbacks with TermApp.
+// !!! IMPORTANT!!!
+// This must be called *AFTER* WindowsXamlManager::InitializeForCurrentThread.
+// If it isn't, then we won't be able to create the XAML island.
+// Arguments:
+// - <none>
+// Return Value:
+// - <none>
+void AppHost::Initialize()
+{
+    _window->Initialize();
+
+    ////////////////////////////////////////////////////////////////////////////
+    // Initialize the UI
+    ////////////////////////////////////////////////////////////////////////////
+    _rootGrid = Grid();
+    _swapchainsGrid = Grid();
+    _swp0 = SwapChainPanel();
+    _swp1 = SwapChainPanel();
+    _swp2 = SwapChainPanel();
+    _swp3 = SwapChainPanel();
+    // Set up the content of the application. If the app has a custom titlebar,
+    // set that content as well.
+    {
+        auto firstRowDef = Controls::RowDefinition();
+        firstRowDef.Height(GridLengthHelper::FromValueAndType(1, GridUnitType::Star));
+
+        auto secondRowDef = Controls::RowDefinition();
+        secondRowDef.Height(GridLengthHelper::FromValueAndType(9, GridUnitType::Star));
+
+        _rootGrid.RowDefinitions().Append(firstRowDef);
+        _rootGrid.RowDefinitions().Append(secondRowDef);
+    }
+    {
+        auto firstRowDef = Controls::RowDefinition();
+        firstRowDef.Height(GridLengthHelper::FromValueAndType(1, GridUnitType::Star));
+
+        auto secondRowDef = Controls::RowDefinition();
+        secondRowDef.Height(GridLengthHelper::FromValueAndType(1, GridUnitType::Star));
+
+        _swapchainsGrid.RowDefinitions().Append(firstRowDef);
+        _swapchainsGrid.RowDefinitions().Append(secondRowDef);
+
+        auto firstColDef = Controls::ColumnDefinition();
+        firstColDef.Width(GridLengthHelper::FromValueAndType(1, GridUnitType::Star));
+
+        auto secondColDef = Controls::ColumnDefinition();
+        secondColDef.Width(GridLengthHelper::FromValueAndType(1, GridUnitType::Star));
+
+        _swapchainsGrid.ColumnDefinitions().Append(firstColDef);
+        _swapchainsGrid.ColumnDefinitions().Append(secondColDef);
+    }
+
+    _rootGrid.Children().Append(_swapchainsGrid);
+    Controls::Grid::SetRow(_swapchainsGrid, 1);
+
+    {
+        Media::SolidColorBrush solidColor{};
+        til::color newBgColor{ 0xFFFF0000 };
+        solidColor.Color(newBgColor);
+        _rootGrid.Background(solidColor);
+    }
+    {
+        Media::SolidColorBrush solidColor{};
+        til::color newBgColor{ 0xFF00FF00 };
+        solidColor.Color(newBgColor);
+        _swapchainsGrid.Background(solidColor);
+    }
+
+    winrt::Windows::UI::Xaml::Thickness newMargin = ThicknessHelper::FromUniformLength(4);
+    _swp0.Margin(newMargin);
+    _swp1.Margin(newMargin);
+    _swp2.Margin(newMargin);
+    _swp3.Margin(newMargin);
+
+    _rootGrid.Children().Append(_swp0);
+    _rootGrid.Children().Append(_swp1);
+    _rootGrid.Children().Append(_swp2);
+    _rootGrid.Children().Append(_swp3);
+
+    Controls::Grid::SetRow(_swp0, 0);
+    Controls::Grid::SetColumn(_swp0, 0);
+
+    Controls::Grid::SetRow(_swp1, 0);
+    Controls::Grid::SetColumn(_swp1, 1);
+
+    Controls::Grid::SetRow(_swp2, 1);
+    Controls::Grid::SetColumn(_swp2, 0);
+
+    Controls::Grid::SetRow(_swp3, 1);
+    Controls::Grid::SetColumn(_swp3, 1);
+    _window->SetContent(_rootGrid);
+    ////////////////////////////////////////////////////////////////////////////
+
+    _createHost();
+
+    _window->OnAppInitialized();
+}
+
+winrt::fire_and_forget AppHost::_createHost()
+{
+    co_await winrt::resume_background();
+
+    auto host0 = _manager.CreateHost();
+
+    co_await winrt::resume_foreground(_swp0.Dispatcher());
+
+    host0.CreateSwapChain(_swp0);
+
+    _swp0_layoutUpdatedRevoker = _swp0.LayoutUpdated(winrt::auto_revoke, [this, host0](auto /*s*/, auto /*e*/) {
+        // This event fires every time the layout changes, but it is always the last one to fire
+        // in any layout change chain. That gives us great flexibility in finding the right point
+        // at which to initialize our renderer (and our terminal).
+        // Any earlier than the last layout update and we may not know the terminal's starting size.
+
+        host0.Host().BeginRendering();
+
+        // if (_InitializeTerminal())
+        // {
+        // Only let this succeed once.
+        _swp0_layoutUpdatedRevoker.revoke();
+        // }
+    });
+}
+
+// Method Description:
+// - Resize the window we're about to create to the appropriate dimensions, as
+//   specified in the settings. This will be called during the handling of
+//   WM_CREATE. We'll load the settings for the app, then get the proposed size
+//   of the terminal from the app. Using that proposed size, we'll resize the
+//   window we're creating, so that it'll match the values in the settings.
+// Arguments:
+// - hwnd: The HWND of the window we're about to create.
+// - proposedRect: The location and size of the window that we're about to
+//   create. We'll use this rect to determine which monitor the window is about
+//   to appear on.
+// - launchMode: A LaunchMode enum reference that indicates the launch mode
+// Return Value:
+// - None
+void AppHost::_HandleCreateWindow(const HWND hwnd, RECT proposedRect)
+{
+    // Acquire the actual initial position
+    winrt::Windows::Foundation::Point initialPosition{ (float)proposedRect.left, (float)proposedRect.top };
+    proposedRect.left = gsl::narrow_cast<long>(initialPosition.X);
+    proposedRect.top = gsl::narrow_cast<long>(initialPosition.Y);
+
+    long adjustedHeight = 0;
+    long adjustedWidth = 0;
+
+    // Find nearest monitor.
+    HMONITOR hmon = MonitorFromRect(&proposedRect, MONITOR_DEFAULTTONEAREST);
+
+    // Get nearest monitor information
+    MONITORINFO monitorInfo;
+    monitorInfo.cbSize = sizeof(MONITORINFO);
+    GetMonitorInfo(hmon, &monitorInfo);
+
+    // This API guarantees that dpix and dpiy will be equal, but neither is an
+    // optional parameter so give two UINTs.
+    UINT dpix = USER_DEFAULT_SCREEN_DPI;
+    UINT dpiy = USER_DEFAULT_SCREEN_DPI;
+    // If this fails, we'll use the default of 96.
+    GetDpiForMonitor(hmon, MDT_EFFECTIVE_DPI, &dpix, &dpiy);
+
+    // We need to check if the top left point of the titlebar of the window is within any screen
+    RECT offScreenTestRect;
+    offScreenTestRect.left = proposedRect.left;
+    offScreenTestRect.top = proposedRect.top;
+    offScreenTestRect.right = offScreenTestRect.left + 1;
+    offScreenTestRect.bottom = offScreenTestRect.top + 1;
+
+    bool isTitlebarIntersectWithMonitors = false;
+    EnumDisplayMonitors(
+        nullptr, &offScreenTestRect, [](HMONITOR, HDC, LPRECT, LPARAM lParam) -> BOOL {
+            auto intersectWithMonitor = reinterpret_cast<bool*>(lParam);
+            *intersectWithMonitor = true;
+            // Continue the enumeration
+            return FALSE;
+        },
+        reinterpret_cast<LPARAM>(&isTitlebarIntersectWithMonitors));
+
+    if (!isTitlebarIntersectWithMonitors)
+    {
+        // If the title bar is out-of-screen, we set the initial position to
+        // the top left corner of the nearest monitor
+        proposedRect.left = monitorInfo.rcWork.left;
+        proposedRect.top = monitorInfo.rcWork.top;
+    }
+
+    winrt::Windows::Foundation::Size initialSize{ 800, 600 };
+
+    const short islandWidth = Utils::ClampToShortMax(
+        static_cast<long>(ceil(initialSize.Width)), 1);
+    const short islandHeight = Utils::ClampToShortMax(
+        static_cast<long>(ceil(initialSize.Height)), 1);
+
+    // Get the size of a window we'd need to host that client rect. This will
+    // add the titlebar space.
+    const auto nonClientSize = _window->GetTotalNonClientExclusiveSize(dpix);
+    adjustedWidth = islandWidth + nonClientSize.cx;
+    adjustedHeight = islandHeight + nonClientSize.cy;
+
+    const COORD origin{ gsl::narrow<short>(proposedRect.left),
+                        gsl::narrow<short>(proposedRect.top) };
+    const COORD dimensions{ Utils::ClampToShortMax(adjustedWidth, 1),
+                            Utils::ClampToShortMax(adjustedHeight, 1) };
+
+    const auto newPos = Viewport::FromDimensions(origin, dimensions);
+    bool succeeded = SetWindowPos(hwnd,
+                                  nullptr,
+                                  newPos.Left(),
+                                  newPos.Top(),
+                                  newPos.Width(),
+                                  newPos.Height(),
+                                  SWP_NOACTIVATE | SWP_NOZORDER);
+
+    // Refresh the dpi of HWND because the dpi where the window will launch may be different
+    // at this time
+    _window->RefreshCurrentDPI();
+
+    // If we can't resize the window, that's really okay. We can just go on with
+    // the originally proposed window size.
+    LOG_LAST_ERROR_IF(!succeeded);
+}
+
+// Method Description:
+// - Called when the app wants to change its theme. We'll forward this to the
+//   IslandWindow, so it can update the root UI element of the entire XAML tree.
+// Arguments:
+// - sender: unused
+// - arg: the ElementTheme to use as the new theme for the UI
+// Return Value:
+// - <none>
+void AppHost::_UpdateTheme(const winrt::Windows::Foundation::IInspectable&, const winrt::Windows::UI::Xaml::ElementTheme& arg)
+{
+    _window->OnApplicationThemeChanged(arg);
+}

src/tools/ScratchIsland/AppHost.h

@@ -0,0 +1,38 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
+#include "pch.h"
+
+#include "IslandWindow.h"
+#include "HostManager.h"
+
+class AppHost
+{
+public:
+    AppHost() noexcept;
+    virtual ~AppHost();
+
+    void Initialize();
+
+private:
+    bool _useNonClientArea{ false };
+
+    std::unique_ptr<IslandWindow> _window;
+    winrt::ScratchIsland::HostManager _manager;
+
+    void _HandleCreateWindow(const HWND hwnd, RECT proposedRect);
+    void _UpdateTheme(const winrt::Windows::Foundation::IInspectable&,
+                      const winrt::Windows::UI::Xaml::ElementTheme& arg);
+
+    winrt::fire_and_forget _createHost();
+
+    winrt::Windows::UI::Xaml::Controls::Grid _rootGrid{ nullptr };
+    winrt::Windows::UI::Xaml::Controls::Grid _swapchainsGrid{ nullptr };
+
+    winrt::Windows::UI::Xaml::Controls::SwapChainPanel _swp0{ nullptr };
+    winrt::Windows::UI::Xaml::Controls::SwapChainPanel _swp1{ nullptr };
+    winrt::Windows::UI::Xaml::Controls::SwapChainPanel _swp2{ nullptr };
+    winrt::Windows::UI::Xaml::Controls::SwapChainPanel _swp3{ nullptr };
+
+    winrt::Windows::UI::Xaml::Controls::SwapChainPanel::LayoutUpdated_revoker _swp0_layoutUpdatedRevoker;
+};

src/tools/ScratchIsland/BaseWindow.h

@@ -0,0 +1,228 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
+#pragma once
+
+// Custom window messages
+#define CM_UPDATE_TITLE (WM_USER)
+
+#include <wil/resource.h>
+
+template<typename T>
+class BaseWindow
+{
+public:
+    virtual ~BaseWindow() = 0;
+    static T* GetThisFromHandle(HWND const window) noexcept
+    {
+        return reinterpret_cast<T*>(GetWindowLongPtr(window, GWLP_USERDATA));
+    }
+
+    [[nodiscard]] static LRESULT __stdcall WndProc(HWND const window, UINT const message, WPARAM const wparam, LPARAM const lparam) noexcept
+    {
+        WINRT_ASSERT(window);
+
+        if (WM_NCCREATE == message)
+        {
+            auto cs = reinterpret_cast<CREATESTRUCT*>(lparam);
+            T* that = static_cast<T*>(cs->lpCreateParams);
+            WINRT_ASSERT(that);
+            WINRT_ASSERT(!that->_window);
+            that->_window = wil::unique_hwnd(window);
+
+            return that->_OnNcCreate(wparam, lparam);
+        }
+        else if (T* that = GetThisFromHandle(window))
+        {
+            return that->MessageHandler(message, wparam, lparam);
+        }
+
+        return DefWindowProc(window, message, wparam, lparam);
+    }
+
+    [[nodiscard]] virtual LRESULT MessageHandler(UINT const message, WPARAM const wparam, LPARAM const lparam) noexcept
+    {
+        switch (message)
+        {
+        case WM_DPICHANGED:
+        {
+            return HandleDpiChange(_window.get(), wparam, lparam);
+        }
+
+        case WM_DESTROY:
+        {
+            PostQuitMessage(0);
+            return 0;
+        }
+
+        case WM_SIZE:
+        {
+            UINT width = LOWORD(lparam);
+            UINT height = HIWORD(lparam);
+
+            switch (wparam)
+            {
+            case SIZE_MAXIMIZED:
+                [[fallthrough]];
+            case SIZE_RESTORED:
+                if (_minimized)
+                {
+                    _minimized = false;
+                    OnRestore();
+                }
+
+                // We always need to fire the resize event, even when we're transitioning from minimized.
+                // We might be transitioning directly from minimized to maximized, and we'll need
+                // to trigger any size-related content changes.
+                OnResize(width, height);
+                break;
+            case SIZE_MINIMIZED:
+                if (!_minimized)
+                {
+                    _minimized = true;
+                    OnMinimize();
+                }
+                break;
+            default:
+                // do nothing.
+                break;
+            }
+            break;
+        }
+        case CM_UPDATE_TITLE:
+        {
+            SetWindowTextW(_window.get(), _title.c_str());
+            break;
+        }
+        }
+
+        return DefWindowProc(_window.get(), message, wparam, lparam);
+    }
+
+    // DPI Change handler. on WM_DPICHANGE resize the window
+    [[nodiscard]] LRESULT HandleDpiChange(const HWND hWnd, const WPARAM wParam, const LPARAM lParam)
+    {
+        _inDpiChange = true;
+        const HWND hWndStatic = GetWindow(hWnd, GW_CHILD);
+        if (hWndStatic != nullptr)
+        {
+            const UINT uDpi = HIWORD(wParam);
+
+            // Resize the window
+            auto lprcNewScale = reinterpret_cast<RECT*>(lParam);
+
+            SetWindowPos(hWnd, nullptr, lprcNewScale->left, lprcNewScale->top, lprcNewScale->right - lprcNewScale->left, lprcNewScale->bottom - lprcNewScale->top, SWP_NOZORDER | SWP_NOACTIVATE);
+
+            _currentDpi = uDpi;
+        }
+        _inDpiChange = false;
+        return 0;
+    }
+
+    virtual void OnResize(const UINT width, const UINT height) = 0;
+    virtual void OnMinimize() = 0;
+    virtual void OnRestore() = 0;
+
+    RECT GetWindowRect() const noexcept
+    {
+        RECT rc = { 0 };
+        ::GetWindowRect(_window.get(), &rc);
+        return rc;
+    }
+
+    HWND GetHandle() const noexcept
+    {
+        return _window.get();
+    }
+
+    float GetCurrentDpiScale() const noexcept
+    {
+        const auto dpi = ::GetDpiForWindow(_window.get());
+        const auto scale = static_cast<float>(dpi) / static_cast<float>(USER_DEFAULT_SCREEN_DPI);
+        return scale;
+    }
+
+    //// Gets the physical size of the client area of the HWND in _window
+    SIZE GetPhysicalSize() const noexcept
+    {
+        RECT rect = {};
+        GetClientRect(_window.get(), &rect);
+        const auto windowsWidth = rect.right - rect.left;
+        const auto windowsHeight = rect.bottom - rect.top;
+        return SIZE{ windowsWidth, windowsHeight };
+    }
+
+    //// Gets the logical (in DIPs) size of a physical size specified by the parameter physicalSize
+    //// Remarks:
+    //// XAML coordinate system is always in Display Independent Pixels (a.k.a DIPs or Logical). However Win32 GDI (because of legacy reasons)
+    //// in DPI mode "Per-Monitor and Per-Monitor (V2) DPI Awareness" is always in physical pixels.
+    //// The formula to transform is:
+    ////     logical = (physical / dpi) + 0.5 // 0.5 is to ensure that we pixel snap correctly at the edges, this is necessary with odd DPIs like 1.25, 1.5, 1, .75
+    //// See also:
+    ////   https://docs.microsoft.com/en-us/windows/desktop/LearnWin32/dpi-and-device-independent-pixels
+    ////   https://docs.microsoft.com/en-us/windows/desktop/hidpi/high-dpi-desktop-application-development-on-windows#per-monitor-and-per-monitor-v2-dpi-awareness
+    winrt::Windows::Foundation::Size GetLogicalSize(const SIZE physicalSize) const noexcept
+    {
+        const auto scale = GetCurrentDpiScale();
+        // 0.5 is to ensure that we pixel snap correctly at the edges, this is necessary with odd DPIs like 1.25, 1.5, 1, .75
+        const auto logicalWidth = (physicalSize.cx / scale) + 0.5f;
+        const auto logicalHeight = (physicalSize.cy / scale) + 0.5f;
+        return winrt::Windows::Foundation::Size(logicalWidth, logicalHeight);
+    }
+
+    winrt::Windows::Foundation::Size GetLogicalSize() const noexcept
+    {
+        return GetLogicalSize(GetPhysicalSize());
+    }
+
+    // Method Description:
+    // - Sends a message to our message loop to update the title of the window.
+    // Arguments:
+    // - newTitle: a string to use as the new title of the window.
+    // Return Value:
+    // - <none>
+    void UpdateTitle(std::wstring_view newTitle)
+    {
+        _title = newTitle;
+        PostMessageW(_window.get(), CM_UPDATE_TITLE, 0, reinterpret_cast<LPARAM>(nullptr));
+    }
+
+    // Method Description:
+    // Reset the current dpi of the window. This method is only called after we change the
+    // initial launch position. This makes sure the dpi is consistent with the monitor on which
+    // the window will launch
+    void RefreshCurrentDPI()
+    {
+        _currentDpi = GetDpiForWindow(_window.get());
+    }
+
+protected:
+    using base_type = BaseWindow<T>;
+    wil::unique_hwnd _window;
+
+    unsigned int _currentDpi = 0;
+    bool _inDpiChange = false;
+
+    std::wstring _title = L"";
+
+    bool _minimized = false;
+
+    // Method Description:
+    // - This method is called when the window receives the WM_NCCREATE message.
+    // Return Value:
+    // - The value returned from the window proc.
+    virtual [[nodiscard]] LRESULT _OnNcCreate(WPARAM wParam, LPARAM lParam) noexcept
+    {
+        SetWindowLongPtr(_window.get(), GWLP_USERDATA, reinterpret_cast<LONG_PTR>(this));
+
+        EnableNonClientDpiScaling(_window.get());
+        _currentDpi = GetDpiForWindow(_window.get());
+
+        return DefWindowProc(_window.get(), WM_NCCREATE, wParam, lParam);
+    };
+};
+
+template<typename T>
+inline BaseWindow<T>::~BaseWindow()
+{
+}

src/tools/ScratchIsland/HostAndProcess.cpp

@@ -0,0 +1,50 @@
+#include "pch.h"
+#include "HostAndProcess.h"
+
+#include "HostAndProcess.g.cpp"
+#include "../../types/inc/utils.hpp"
+
+using namespace winrt;
+using namespace winrt::Windows::Foundation;
+using namespace ::Microsoft::Console;
+
+namespace winrt::ScratchIsland::implementation
+{
+    HostAndProcess::HostAndProcess(ScratchWinRTServer::HostClass host,
+                                   wil::unique_process_information pi /*, wil::unique_handle hSwapchain*/) :
+        _host{ host },
+        _pi{ std::move(pi) } /*,
+        _hOurSwapchain {std::move(hSwapchain)}*/
+    {
+    }
+
+    ScratchWinRTServer::HostClass HostAndProcess::Host() const
+    {
+        return _host;
+    }
+
+    void HostAndProcess::CreateSwapChain(winrt::Windows::UI::Xaml::Controls::SwapChainPanel panel)
+    {
+        // wil::unique_handle _swapChainHandle;
+        DCompositionCreateSurfaceHandle(GENERIC_ALL, nullptr, &_hOurSwapchain);
+        // wil::unique_handle otherProcess = OpenProcess(contentProcessPid);
+        // HANDLE otherGuysHandleId = INVALID_HANDLE_VALUE;
+        BOOL ret = DuplicateHandle(GetCurrentProcess(),
+                                   _hOurSwapchain.get(),
+                                   _pi.hProcess,
+                                   &_hTheirSwapchain,
+                                   0,
+                                   FALSE,
+                                   DUPLICATE_SAME_ACCESS);
+
+        // {
+        auto panelNative = panel.as<ISwapChainPanelNative2>();
+        winrt::check_hresult(panelNative->SetSwapChainHandle(_hOurSwapchain.get()));
+        // }
+
+        _host.ThisIsInsane((uint64_t)_hTheirSwapchain.get());
+
+        ret;
+    }
+
+}

src/tools/ScratchIsland/HostAndProcess.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include <winrt/ScratchWinRTServer.h>
+#include "HostAndProcess.g.h"
+
+namespace winrt::ScratchIsland::implementation
+{
+    struct HostAndProcess : public HostAndProcessT<HostAndProcess>
+    {
+        HostAndProcess(ScratchWinRTServer::HostClass host, wil::unique_process_information pi);
+
+        ScratchWinRTServer::HostClass Host() const;
+
+        void CreateSwapChain(Windows::UI::Xaml::Controls::SwapChainPanel panel);
+
+    private:
+        ScratchWinRTServer::HostClass _host{ nullptr };
+        wil::unique_process_information _pi;
+        wil::unique_handle _hOurSwapchain{ INVALID_HANDLE_VALUE };
+        wil::unique_handle _hTheirSwapchain{ INVALID_HANDLE_VALUE };
+    };
+}
+
+namespace winrt::ScratchIsland::factory_implementation
+{
+    // struct HostAndProcess : HostAndProcessT<HostAndProcess, implementation::HostAndProcess>
+    // {
+    // };
+}

src/tools/ScratchIsland/HostAndProcess.idl

@@ -0,0 +1,9 @@
+
+
+namespace ScratchIsland
+{
+    [default_interface] runtimeclass HostAndProcess {
+        ScratchWinRTServer.HostClass Host { get; };
+        void CreateSwapChain(Windows.UI.Xaml.Controls.SwapChainPanel panel);
+    };
+}

src/tools/ScratchIsland/HostManager.cpp

@@ -0,0 +1,81 @@
+#include "pch.h"
+#include "HostManager.h"
+
+#include "HostManager.g.cpp"
+#include "../../types/inc/utils.hpp"
+
+using namespace winrt;
+using namespace winrt::Windows::Foundation;
+using namespace ::Microsoft::Console;
+
+namespace winrt::ScratchIsland::implementation
+{
+    HostManager::HostManager()
+    {
+        _hosts = winrt::single_threaded_observable_vector<winrt::ScratchIsland::HostAndProcess>();
+    }
+
+    Collections::IObservableVector<winrt::ScratchIsland::HostAndProcess> HostManager::Hosts()
+    {
+        return _hosts;
+    }
+
+    static wil::unique_process_information _createHostClassProcess(const winrt::guid& g)
+    {
+        auto guidStr{ Utils::GuidToString(g) };
+        std::wstring commandline{ fmt::format(L"ScratchWinRTServer.exe {}", guidStr) };
+        STARTUPINFO siOne{ 0 };
+        siOne.cb = sizeof(STARTUPINFOW);
+        wil::unique_process_information piOne;
+        auto succeeded = CreateProcessW(
+            nullptr,
+            commandline.data(),
+            nullptr, // lpProcessAttributes
+            nullptr, // lpThreadAttributes
+            false, // bInheritHandles
+            CREATE_UNICODE_ENVIRONMENT, // dwCreationFlags
+            nullptr, // lpEnvironment
+            nullptr, // startingDirectory
+            &siOne, // lpStartupInfo
+            &piOne // lpProcessInformation
+        );
+        THROW_IF_WIN32_BOOL_FALSE(succeeded);
+        // if (!succeeded)
+        // {
+        //     printf("Failed to create host process\n");
+        //     return;
+        // }
+
+        // Ooof this is dumb, but we need a sleep here to make the server starts.
+        // That's _sub par_. Maybe we could use the host's stdout to have them emit
+        // a byte when they're set up?
+        Sleep(2500);
+
+        // TODO MONDAY - It seems like it takes conhost too long to start up to
+        // host the ScratchWinRTServer that even a sleep 100 is too short. However,
+        // any longer, and XAML will just crash, because some frame took too long.
+        // So we _need_ to do the "have the server explicitly tell us it's ready"
+        // thing, and maybe also do it on a bg thread (and signal to the UI thread
+        // that it can attach now)
+
+        return std::move(piOne);
+    }
+
+    winrt::ScratchIsland::HostAndProcess HostManager::CreateHost()
+    {
+        // 1. Generate a GUID.
+        winrt::guid g{ Utils::CreateGuid() };
+
+        // 2. Spawn a Server.exe, with the guid on the commandline
+        auto piContent{ std::move(_createHostClassProcess(g)) };
+
+        auto host = create_instance<winrt::ScratchWinRTServer::HostClass>(g, CLSCTX_LOCAL_SERVER);
+        THROW_IF_NULL_ALLOC(host);
+
+        auto hostAndProcess = winrt::make_self<HostAndProcess>(host, std::move(piContent));
+
+        _hosts.Append(*hostAndProcess);
+
+        return *hostAndProcess;
+    }
+}

src/tools/ScratchIsland/HostManager.h

@@ -0,0 +1,66 @@
+#pragma once
+
+#include "HostManager.g.h"
+#include "HostAndProcess.h"
+
+// 50dba6cd-4ddb-4b12-8363-5e06f5d0082c
+static constexpr GUID HostManager_clsid{
+    0x50dba6cd,
+    0x4ddb,
+    0x4b12,
+    { 0x83, 0x63, 0x5e, 0x06, 0xf5, 0xd0, 0x08, 0x2c }
+};
+
+namespace winrt::ScratchIsland::implementation
+{
+    struct HostManager : public HostManagerT<HostManager>
+    {
+        HostManager();
+
+        Windows::Foundation::Collections::IObservableVector<winrt::ScratchIsland::HostAndProcess> Hosts();
+        winrt::ScratchIsland::HostAndProcess CreateHost();
+
+    private:
+        Windows::Foundation::Collections::IObservableVector<winrt::ScratchIsland::HostAndProcess> _hosts{ nullptr };
+    };
+}
+
+namespace winrt::ScratchIsland::factory_implementation
+{
+    struct HostManager : HostManagerT<HostManager, implementation::HostManager>
+    {
+    };
+}
+
+// I bet all this could be a macro.
+// I MORE be that this is all done by the factory_implementation stuff, isn't it...
+struct HostManagerFactory : winrt::implements<HostManagerFactory, IClassFactory>
+{
+    HRESULT __stdcall CreateInstance(IUnknown* outer, GUID const& iid, void** result) noexcept final
+    {
+        *result = nullptr;
+        if (outer)
+        {
+            return CLASS_E_NOAGGREGATION;
+        }
+
+        return winrt::make<winrt::ScratchIsland::implementation::HostManager>().as(iid, result);
+    }
+
+    HRESULT __stdcall LockServer(BOOL) noexcept final
+    {
+        return S_OK;
+    }
+
+    static void RegisterHostManager()
+    {
+        DWORD registrationHostManager{};
+
+        winrt::check_hresult(CoRegisterClassObject(HostManager_clsid,
+                                                   winrt::make<HostManagerFactory>().get(),
+                                                   CLSCTX_LOCAL_SERVER,
+                                                   REGCLS_MULTIPLEUSE,
+                                                   &registrationHostManager));
+        printf("registrationHostManager:%d\n", registrationHostManager);
+    }
+};

src/tools/ScratchIsland/HostManager.idl

@@ -0,0 +1,12 @@
+import "HostAndProcess.idl";
+
+namespace ScratchIsland
+{
+    [default_interface] runtimeclass HostManager // : IScratchInterface
+    {
+        HostManager();
+
+        Windows.Foundation.Collections.IObservableVector<HostAndProcess> Hosts { get; };
+        HostAndProcess CreateHost();
+    };
+}

src/tools/ScratchIsland/IslandWindow.cpp

@@ -0,0 +1,605 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
+#include "pch.h"
+#include "IslandWindow.h"
+#include "../types/inc/Viewport.hpp"
+#include "resource.h"
+
+extern "C" IMAGE_DOS_HEADER __ImageBase;
+
+using namespace winrt::Windows::UI;
+using namespace winrt::Windows::UI::Composition;
+using namespace winrt::Windows::UI::Xaml;
+using namespace winrt::Windows::UI::Xaml::Hosting;
+using namespace winrt::Windows::Foundation::Numerics;
+using namespace ::Microsoft::Console::Types;
+
+#define XAML_HOSTING_WINDOW_CLASS_NAME L"SCRATCH_ISLAND_CLASS"
+
+IslandWindow::IslandWindow() noexcept :
+    _interopWindowHandle{ nullptr },
+    _rootGrid{ nullptr },
+    _source{ nullptr },
+    _pfnCreateCallback{ nullptr }
+{
+}
+
+IslandWindow::~IslandWindow()
+{
+    _source.Close();
+}
+
+// Method Description:
+// - Create the actual window that we'll use for the application.
+// Arguments:
+// - <none>
+// Return Value:
+// - <none>
+void IslandWindow::MakeWindow() noexcept
+{
+    WNDCLASS wc{};
+    wc.hCursor = LoadCursor(nullptr, IDC_ARROW);
+    wc.hInstance = reinterpret_cast<HINSTANCE>(&__ImageBase);
+    wc.lpszClassName = XAML_HOSTING_WINDOW_CLASS_NAME;
+    wc.style = CS_HREDRAW | CS_VREDRAW;
+    wc.lpfnWndProc = WndProc;
+    wc.hIcon = LoadIconW(wc.hInstance, MAKEINTRESOURCEW(IDI_APPICON));
+    RegisterClass(&wc);
+    WINRT_ASSERT(!_window);
+
+    // Create the window with the default size here - During the creation of the
+    // window, the system will give us a chance to set its size in WM_CREATE.
+    // WM_CREATE will be handled synchronously, before CreateWindow returns.
+    WINRT_VERIFY(CreateWindowEx(_alwaysOnTop ? WS_EX_TOPMOST : 0,
+                                wc.lpszClassName,
+                                L"Scratch Island",
+                                WS_OVERLAPPEDWINDOW,
+                                CW_USEDEFAULT,
+                                CW_USEDEFAULT,
+                                CW_USEDEFAULT,
+                                CW_USEDEFAULT,
+                                nullptr,
+                                nullptr,
+                                wc.hInstance,
+                                this));
+
+    WINRT_ASSERT(_window);
+}
+
+// Method Description:
+// - Called when no tab is remaining to close the window.
+// Arguments:
+// - <none>
+// Return Value:
+// - <none>
+void IslandWindow::Close()
+{
+    PostQuitMessage(0);
+}
+
+// Method Description:
+// - Set a callback to be called when we process a WM_CREATE message. This gives
+//   the AppHost a chance to resize the window to the proper size.
+// Arguments:
+// - pfn: a function to be called during the handling of WM_CREATE. It takes two
+//   parameters:
+//      * HWND: the HWND of the window that's being created.
+//      * RECT: The position on the screen that the system has proposed for our
+//        window.
+// Return Value:
+// - <none>
+void IslandWindow::SetCreateCallback(std::function<void(const HWND, const RECT)> pfn) noexcept
+{
+    _pfnCreateCallback = pfn;
+}
+
+// Method Description:
+// - Handles a WM_CREATE message. Calls our create callback, if one's been set.
+// Arguments:
+// - wParam: unused
+// - lParam: the lParam of a WM_CREATE, which is a pointer to a CREATESTRUCTW
+// Return Value:
+// - <none>
+void IslandWindow::_HandleCreateWindow(const WPARAM, const LPARAM lParam) noexcept
+{
+    // Get proposed window rect from create structure
+    CREATESTRUCTW* pcs = reinterpret_cast<CREATESTRUCTW*>(lParam);
+    RECT rc;
+    rc.left = pcs->x;
+    rc.top = pcs->y;
+    rc.right = rc.left + pcs->cx;
+    rc.bottom = rc.top + pcs->cy;
+
+    if (_pfnCreateCallback)
+    {
+        _pfnCreateCallback(_window.get(), rc);
+    }
+
+    int nCmdShow = SW_SHOW;
+
+    ShowWindow(_window.get(), nCmdShow);
+
+    UpdateWindow(_window.get());
+}
+
+// Method Description:
+// - Handles a WM_SIZING message, which occurs when user drags a window border
+//   or corner. It intercepts this resize action and applies 'snapping' i.e.
+//   aligns the terminal's size to its cell grid. We're given the window size,
+//   which we then adjust based on the terminal's properties (like font size).
+// Arguments:
+// - wParam: Specifies which edge of the window is being dragged.
+// - lParam: Pointer to the requested window rectangle (this is, the one that
+//   originates from current drag action). It also acts as the return value
+//   (it's a ref parameter).
+// Return Value:
+// - <none>
+LRESULT IslandWindow::_OnSizing(const WPARAM /*wParam*/, const LPARAM /*lParam*/)
+{
+    // If we haven't been given the callback that would adjust the dimension,
+    // then we can't do anything, so just bail out.
+    return FALSE;
+}
+
+void IslandWindow::Initialize()
+{
+    const bool initialized = (_interopWindowHandle != nullptr);
+
+    _source = DesktopWindowXamlSource{};
+
+    auto interop = _source.as<IDesktopWindowXamlSourceNative>();
+    winrt::check_hresult(interop->AttachToWindow(_window.get()));
+
+    // stash the child interop handle so we can resize it when the main hwnd is resized
+    interop->get_WindowHandle(&_interopWindowHandle);
+
+    _rootGrid = winrt::Windows::UI::Xaml::Controls::Grid();
+    _source.Content(_rootGrid);
+}
+
+void IslandWindow::OnSize(const UINT width, const UINT height)
+{
+    // update the interop window size
+    SetWindowPos(_interopWindowHandle, nullptr, 0, 0, width, height, SWP_SHOWWINDOW);
+
+    if (_rootGrid)
+    {
+        const auto size = GetLogicalSize();
+        _rootGrid.Width(size.Width);
+        _rootGrid.Height(size.Height);
+    }
+}
+
+[[nodiscard]] LRESULT IslandWindow::MessageHandler(UINT const message, WPARAM const wparam, LPARAM const lparam) noexcept
+{
+    switch (message)
+    {
+    case WM_CREATE:
+    {
+        _HandleCreateWindow(wparam, lparam);
+        return 0;
+    }
+    case WM_SETFOCUS:
+    {
+        if (_interopWindowHandle != nullptr)
+        {
+            // send focus to the child window
+            SetFocus(_interopWindowHandle);
+            return 0; // eat the message
+        }
+    }
+
+    case WM_NCLBUTTONDOWN:
+    case WM_NCLBUTTONUP:
+    case WM_NCMBUTTONDOWN:
+    case WM_NCMBUTTONUP:
+    case WM_NCRBUTTONDOWN:
+    case WM_NCRBUTTONUP:
+    case WM_NCXBUTTONDOWN:
+    case WM_NCXBUTTONUP:
+    {
+        // If we clicked in the titlebar, raise an event so the app host can
+        // dispatch an appropriate event.
+        _DragRegionClickedHandlers();
+        break;
+    }
+    case WM_MENUCHAR:
+    {
+        // GH#891: return this LRESULT here to prevent the app from making a
+        // bell when alt+key is pressed. A menu is active and the user presses a
+        // key that does not correspond to any mnemonic or accelerator key,
+        return MAKELRESULT(0, MNC_CLOSE);
+    }
+    case WM_SIZING:
+    {
+        return _OnSizing(wparam, lparam);
+    }
+    case WM_CLOSE:
+    {
+        // // If the user wants to close the app by clicking 'X' button,
+        // // we hand off the close experience to the app layer. If all the tabs
+        // // are closed, the window will be closed as well.
+        // _windowCloseButtonClickedHandler();
+        // return 0;
+        Close();
+    }
+    case WM_MOUSEWHEEL:
+        try
+        {
+            // This whole handler is a hack for GH#979.
+            //
+            // On some laptops, their trackpads won't scroll inactive windows
+            // _ever_. With our entire window just being one giant XAML Island, the
+            // touchpad driver thinks our entire window is inactive, and won't
+            // scroll the XAML island. On those types of laptops, we'll get a
+            // WM_MOUSEWHEEL here, in our root window, when the trackpad scrolls.
+            // We're going to take that message and manually plumb it through to our
+            // TermControl's, or anything else that implements IMouseWheelListener.
+
+            // https://msdn.microsoft.com/en-us/library/windows/desktop/ms645617(v=vs.85).aspx
+            // Important! Do not use the LOWORD or HIWORD macros to extract the x-
+            // and y- coordinates of the cursor position because these macros return
+            // incorrect results on systems with multiple monitors. Systems with
+            // multiple monitors can have negative x- and y- coordinates, and LOWORD
+            // and HIWORD treat the coordinates as unsigned quantities.
+            const til::point eventPoint{ GET_X_LPARAM(lparam), GET_Y_LPARAM(lparam) };
+            // This mouse event is relative to the display origin, not the window. Convert here.
+            const til::rectangle windowRect{ GetWindowRect() };
+            const auto origin = windowRect.origin();
+            const auto relative = eventPoint - origin;
+            // Convert to logical scaling before raising the event.
+            const auto real = relative / GetCurrentDpiScale();
+
+            const short wheelDelta = static_cast<short>(HIWORD(wparam));
+
+            // Raise an event, so any listeners can handle the mouse wheel event manually.
+            _MouseScrolledHandlers(real, wheelDelta);
+            return 0;
+        }
+        CATCH_LOG();
+    }
+
+    // TODO: handle messages here...
+    return base_type::MessageHandler(message, wparam, lparam);
+}
+
+// Method Description:
+// - Called when the window has been resized (or maximized)
+// Arguments:
+// - width: the new width of the window _in pixels_
+// - height: the new height of the window _in pixels_
+void IslandWindow::OnResize(const UINT width, const UINT height)
+{
+    if (_interopWindowHandle)
+    {
+        OnSize(width, height);
+    }
+}
+
+// Method Description:
+// - Called when the window is minimized to the taskbar.
+void IslandWindow::OnMinimize()
+{
+    // TODO GH#1989 Stop rendering island content when the app is minimized.
+}
+
+// Method Description:
+// - Called when the window is restored from having been minimized.
+void IslandWindow::OnRestore()
+{
+    // TODO GH#1989 Stop rendering island content when the app is minimized.
+}
+
+void IslandWindow::SetContent(winrt::Windows::UI::Xaml::UIElement content)
+{
+    _rootGrid.Children().Clear();
+    _rootGrid.Children().Append(content);
+}
+
+// Method Description:
+// - Gets the difference between window and client area size.
+// Arguments:
+// - dpi: dpi of a monitor on which the window is placed
+// Return Value
+// - The size difference
+SIZE IslandWindow::GetTotalNonClientExclusiveSize(const UINT dpi) const noexcept
+{
+    const auto windowStyle = static_cast<DWORD>(GetWindowLong(_window.get(), GWL_STYLE));
+    RECT islandFrame{};
+
+    // If we failed to get the correct window size for whatever reason, log
+    // the error and go on. We'll use whatever the control proposed as the
+    // size of our window, which will be at least close.
+    LOG_IF_WIN32_BOOL_FALSE(AdjustWindowRectExForDpi(&islandFrame, windowStyle, false, 0, dpi));
+
+    return {
+        islandFrame.right - islandFrame.left,
+        islandFrame.bottom - islandFrame.top
+    };
+}
+
+void IslandWindow::OnAppInitialized()
+{
+    // Do a quick resize to force the island to paint
+    const auto size = GetPhysicalSize();
+    OnSize(size.cx, size.cy);
+}
+
+// Method Description:
+// - Called when the app wants to change its theme. We'll update the root UI
+//   element of the entire XAML tree, so that all UI elements get the theme
+//   applied.
+// Arguments:
+// - arg: the ElementTheme to use as the new theme for the UI
+// Return Value:
+// - <none>
+void IslandWindow::OnApplicationThemeChanged(const winrt::Windows::UI::Xaml::ElementTheme& requestedTheme)
+{
+    _rootGrid.RequestedTheme(requestedTheme);
+    // Invalidate the window rect, so that we'll repaint any elements we're
+    // drawing ourselves to match the new theme
+    ::InvalidateRect(_window.get(), nullptr, false);
+}
+
+// Method Description:
+// - Updates our focus mode state. See _SetIsBorderless for more details.
+// Arguments:
+// - <none>
+// Return Value:
+// - <none>
+void IslandWindow::FocusModeChanged(const bool focusMode)
+{
+    // Do nothing if the value was unchanged.
+    if (focusMode == _borderless)
+    {
+        return;
+    }
+
+    _SetIsBorderless(focusMode);
+}
+
+// Method Description:
+// - Updates our fullscreen state. See _SetIsFullscreen for more details.
+// Arguments:
+// - <none>
+// Return Value:
+// - <none>
+void IslandWindow::FullscreenChanged(const bool fullscreen)
+{
+    // Do nothing if the value was unchanged.
+    if (fullscreen == _fullscreen)
+    {
+        return;
+    }
+
+    _SetIsFullscreen(fullscreen);
+}
+
+// Method Description:
+// - Enter or exit the "always on top" state. Before the window is created, this
+//   value will later be used when we create the window to create the window on
+//   top of all others. After the window is created, it will either enter the
+//   group of topmost windows, or exit the group of topmost windows.
+// Arguments:
+// - alwaysOnTop: whether we should be entering or exiting always on top mode.
+// Return Value:
+// - <none>
+void IslandWindow::SetAlwaysOnTop(const bool alwaysOnTop)
+{
+    _alwaysOnTop = alwaysOnTop;
+
+    const auto hwnd = GetHandle();
+    if (hwnd)
+    {
+        SetWindowPos(hwnd,
+                     _alwaysOnTop ? HWND_TOPMOST : HWND_NOTOPMOST,
+                     0, // the window dimensions are unused, because we're passing SWP_NOSIZE
+                     0,
+                     0,
+                     0,
+                     SWP_NOMOVE | SWP_NOSIZE);
+    }
+}
+
+// From GdiEngine::s_SetWindowLongWHelper
+void _SetWindowLongWHelper(const HWND hWnd, const int nIndex, const LONG dwNewLong) noexcept
+{
+    // SetWindowLong has strange error handling. On success, it returns the
+    // previous Window Long value and doesn't modify the Last Error state. To
+    // deal with this, we set the last error to 0/S_OK first, call it, and if
+    // the previous long was 0, we check if the error was non-zero before
+    // reporting. Otherwise, we'll get an "Error: The operation has completed
+    // successfully." and there will be another screenshot on the internet
+    // making fun of Windows. See:
+    // https://msdn.microsoft.com/en-us/library/windows/desktop/ms633591(v=vs.85).aspx
+    SetLastError(0);
+    LONG const lResult = SetWindowLongW(hWnd, nIndex, dwNewLong);
+    if (0 == lResult)
+    {
+        LOG_LAST_ERROR_IF(0 != GetLastError());
+    }
+}
+
+// Method Description:
+// - This is a helper to figure out what the window styles should be, given the
+//   current state of flags like borderless mode and fullscreen mode.
+// Arguments:
+// - <none>
+// Return Value:
+// - a LONG with the appropriate flags set for our current window mode, to be used with GWL_STYLE
+LONG IslandWindow::_getDesiredWindowStyle() const
+{
+    auto windowStyle = GetWindowLongW(GetHandle(), GWL_STYLE);
+
+    // If we're both fullscreen and borderless, fullscreen mode takes precedence.
+
+    if (_fullscreen)
+    {
+        // When moving to fullscreen, remove WS_OVERLAPPEDWINDOW, which specifies
+        // styles for non-fullscreen windows (e.g. caption bar), and add the
+        // WS_POPUP style to allow us to size ourselves to the monitor size.
+        // Do the reverse when restoring from fullscreen.
+        // Doing these modifications to that window will cause a vista-style
+        // window frame to briefly appear when entering and exiting fullscreen.
+        WI_ClearFlag(windowStyle, WS_BORDER);
+        WI_ClearFlag(windowStyle, WS_SIZEBOX);
+        WI_ClearAllFlags(windowStyle, WS_OVERLAPPEDWINDOW);
+
+        WI_SetFlag(windowStyle, WS_POPUP);
+        return windowStyle;
+    }
+    else if (_borderless)
+    {
+        // When moving to borderless, remove WS_OVERLAPPEDWINDOW, which
+        // specifies styles for non-fullscreen windows (e.g. caption bar), and
+        // add the WS_BORDER and WS_SIZEBOX styles. This allows us to still have
+        // a small resizing frame, but without a full titlebar, nor caption
+        // buttons.
+
+        WI_ClearAllFlags(windowStyle, WS_OVERLAPPEDWINDOW);
+        WI_ClearFlag(windowStyle, WS_POPUP);
+
+        WI_SetFlag(windowStyle, WS_BORDER);
+        WI_SetFlag(windowStyle, WS_SIZEBOX);
+        return windowStyle;
+    }
+
+    // Here, we're not in either fullscreen or borderless mode. Return to
+    // WS_OVERLAPPEDWINDOW.
+    WI_ClearFlag(windowStyle, WS_POPUP);
+    WI_ClearFlag(windowStyle, WS_BORDER);
+    WI_ClearFlag(windowStyle, WS_SIZEBOX);
+
+    WI_SetAllFlags(windowStyle, WS_OVERLAPPEDWINDOW);
+
+    return windowStyle;
+}
+
+// Method Description:
+// - Enable or disable focus mode. When entering focus mode, we'll
+//   need to manually hide the entire titlebar.
+// - When we're entering focus we need to do some additional modification
+//   of our window styles. However, the NonClientIslandWindow very explicitly
+//   _doesn't_ need to do these steps.
+// Arguments:
+// - borderlessEnabled: If true, we're entering focus mode. If false, we're leaving.
+// Return Value:
+// - <none>
+void IslandWindow::_SetIsBorderless(const bool borderlessEnabled)
+{
+    _borderless = borderlessEnabled;
+
+    HWND const hWnd = GetHandle();
+
+    // First, modify regular window styles as appropriate
+    auto windowStyle = _getDesiredWindowStyle();
+    _SetWindowLongWHelper(hWnd, GWL_STYLE, windowStyle);
+
+    // Now modify extended window styles as appropriate
+    // When moving to fullscreen, remove the window edge style to avoid an
+    // ugly border when not focused.
+    auto exWindowStyle = GetWindowLongW(hWnd, GWL_EXSTYLE);
+    WI_UpdateFlag(exWindowStyle, WS_EX_WINDOWEDGE, !_fullscreen);
+    _SetWindowLongWHelper(hWnd, GWL_EXSTYLE, exWindowStyle);
+
+    // Resize the window, with SWP_FRAMECHANGED, to trigger user32 to
+    // recalculate the non/client areas
+    const til::rectangle windowPos{ GetWindowRect() };
+    SetWindowPos(GetHandle(),
+                 HWND_TOP,
+                 windowPos.left<int>(),
+                 windowPos.top<int>(),
+                 windowPos.width<int>(),
+                 windowPos.height<int>(),
+                 SWP_SHOWWINDOW | SWP_FRAMECHANGED);
+}
+
+// Method Description:
+// - Controls setting us into or out of fullscreen mode. Largely taken from
+//   Window::SetIsFullscreen in conhost.
+// - When entering fullscreen mode, we'll save the current window size and
+//   location, and expand to take the entire monitor size. When leaving, we'll
+//   use that saved size to restore back to.
+// Arguments:
+// - fullscreenEnabled true if we should enable fullscreen mode, false to disable.
+// Return Value:
+// - <none>
+void IslandWindow::_SetIsFullscreen(const bool fullscreenEnabled)
+{
+    // It is possible to enter _SetIsFullscreen even if we're already in full
+    // screen. Use the old is in fullscreen flag to gate checks that rely on the
+    // current state.
+    const auto oldIsInFullscreen = _fullscreen;
+    _fullscreen = fullscreenEnabled;
+
+    HWND const hWnd = GetHandle();
+
+    // First, modify regular window styles as appropriate
+    auto windowStyle = _getDesiredWindowStyle();
+    _SetWindowLongWHelper(hWnd, GWL_STYLE, windowStyle);
+
+    // Now modify extended window styles as appropriate
+    // When moving to fullscreen, remove the window edge style to avoid an
+    // ugly border when not focused.
+    auto exWindowStyle = GetWindowLongW(hWnd, GWL_EXSTYLE);
+    WI_UpdateFlag(exWindowStyle, WS_EX_WINDOWEDGE, !_fullscreen);
+    _SetWindowLongWHelper(hWnd, GWL_EXSTYLE, exWindowStyle);
+
+    // When entering/exiting fullscreen mode, we also need to backup/restore the
+    // current window size, and resize the window to match the new state.
+    _BackupWindowSizes(oldIsInFullscreen);
+    _ApplyWindowSize();
+}
+
+// Method Description:
+// - Used in entering/exiting fullscreen mode. Saves the current window size,
+//   and the full size of the monitor, for use in _ApplyWindowSize.
+// - Taken from conhost's Window::_BackupWindowSizes
+// Arguments:
+// - fCurrentIsInFullscreen: true if we're currently in fullscreen mode.
+// Return Value:
+// - <none>
+void IslandWindow::_BackupWindowSizes(const bool fCurrentIsInFullscreen)
+{
+    if (_fullscreen)
+    {
+        // Note: the current window size depends on the current state of the
+        // window. So don't back it up if we're already in full screen.
+        if (!fCurrentIsInFullscreen)
+        {
+            _nonFullscreenWindowSize = GetWindowRect();
+        }
+
+        // get and back up the current monitor's size
+        HMONITOR const hCurrentMonitor = MonitorFromWindow(GetHandle(), MONITOR_DEFAULTTONEAREST);
+        MONITORINFO currMonitorInfo;
+        currMonitorInfo.cbSize = sizeof(currMonitorInfo);
+        if (GetMonitorInfo(hCurrentMonitor, &currMonitorInfo))
+        {
+            _fullscreenWindowSize = currMonitorInfo.rcMonitor;
+        }
+    }
+}
+
+// Method Description:
+// - Applys the appropriate window size for transitioning to/from fullscreen mode.
+// - Taken from conhost's Window::_ApplyWindowSize
+// Arguments:
+// - <none>
+// Return Value:
+// - <none>
+void IslandWindow::_ApplyWindowSize()
+{
+    const auto newSize = _fullscreen ? _fullscreenWindowSize : _nonFullscreenWindowSize;
+    LOG_IF_WIN32_BOOL_FALSE(SetWindowPos(GetHandle(),
+                                         HWND_TOP,
+                                         newSize.left,
+                                         newSize.top,
+                                         newSize.right - newSize.left,
+                                         newSize.bottom - newSize.top,
+                                         SWP_FRAMECHANGED));
+}
+
+DEFINE_EVENT(IslandWindow, DragRegionClicked, _DragRegionClickedHandlers, winrt::delegate<>);
+DEFINE_EVENT(IslandWindow, WindowCloseButtonClicked, _windowCloseButtonClickedHandler, winrt::delegate<>);

src/tools/ScratchIsland/IslandWindow.h

@@ -0,0 +1,77 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
+#include "pch.h"
+#include "BaseWindow.h"
+#include "../../cascadia/inc/cppwinrt_utils.h"
+
+class IslandWindow :
+    public BaseWindow<IslandWindow>
+{
+public:
+    IslandWindow() noexcept;
+    virtual ~IslandWindow() override;
+
+    virtual void MakeWindow() noexcept;
+    void Close();
+    virtual void OnSize(const UINT width, const UINT height);
+
+    [[nodiscard]] virtual LRESULT MessageHandler(UINT const message, WPARAM const wparam, LPARAM const lparam) noexcept override;
+    void OnResize(const UINT width, const UINT height) override;
+    void OnMinimize() override;
+    void OnRestore() override;
+    virtual void OnAppInitialized();
+    virtual void SetContent(winrt::Windows::UI::Xaml::UIElement content);
+    virtual void OnApplicationThemeChanged(const winrt::Windows::UI::Xaml::ElementTheme& requestedTheme);
+    virtual SIZE GetTotalNonClientExclusiveSize(const UINT dpi) const noexcept;
+
+    virtual void Initialize();
+
+    void SetCreateCallback(std::function<void(const HWND, const RECT)> pfn) noexcept;
+
+    void FocusModeChanged(const bool focusMode);
+    void FullscreenChanged(const bool fullscreen);
+    void SetAlwaysOnTop(const bool alwaysOnTop);
+
+#pragma endregion
+
+    DECLARE_EVENT(DragRegionClicked, _DragRegionClickedHandlers, winrt::delegate<>);
+    DECLARE_EVENT(WindowCloseButtonClicked, _windowCloseButtonClickedHandler, winrt::delegate<>);
+    WINRT_CALLBACK(MouseScrolled, winrt::delegate<void(til::point, int32_t)>);
+
+protected:
+    void ForceResize()
+    {
+        // Do a quick resize to force the island to paint
+        const auto size = GetPhysicalSize();
+        OnSize(size.cx, size.cy);
+    }
+
+    HWND _interopWindowHandle;
+
+    winrt::Windows::UI::Xaml::Hosting::DesktopWindowXamlSource _source;
+
+    winrt::Windows::UI::Xaml::Controls::Grid _rootGrid;
+
+    std::function<void(const HWND, const RECT)> _pfnCreateCallback;
+
+    void _HandleCreateWindow(const WPARAM wParam, const LPARAM lParam) noexcept;
+    [[nodiscard]] LRESULT _OnSizing(const WPARAM wParam, const LPARAM lParam);
+
+    bool _borderless{ false };
+    bool _fullscreen{ false };
+    bool _alwaysOnTop{ false };
+    RECT _fullscreenWindowSize;
+    RECT _nonFullscreenWindowSize;
+
+    virtual void _SetIsBorderless(const bool borderlessEnabled);
+    virtual void _SetIsFullscreen(const bool fullscreenEnabled);
+    void _BackupWindowSizes(const bool currentIsInFullscreen);
+    void _ApplyWindowSize();
+
+    LONG _getDesiredWindowStyle() const;
+
+private:
+    // This minimum width allows for width the tabs fit
+    static constexpr long minimumWidth = 460L;
+};

src/tools/ScratchIsland/ScratchIsland.def

@@ -0,0 +1 @@
+

src/tools/ScratchIsland/ScratchIsland.manifest

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8" standalone="yes"?>
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
+
+  <!-- This file is copied into ut_app/TerminalApp.Unit.Tests.manifest as part
+  of the pre-build step for that project. Changes should only be made to the
+  WindowsTerminal version of the file. -->
+
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+        <!-- Windows 10 1903 -->
+        <!-- See https://docs.microsoft.com/en-us/windows/apps/desktop/modernize/xaml-islands -->
+        <!-- "maxversiontested" is CASE SENSITIVE. Do not change this.-->
+        <maxversiontested Id="10.0.18362.0"/>
+        <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
+    </application>
+  </compatibility>
+
+  <application xmlns="urn:schemas-microsoft-com:asm.v3">
+    <windowsSettings>
+      <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2</dpiAwareness>
+      <longPathAware xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">true</longPathAware>
+    </windowsSettings>
+  </application>
+</assembly>

src/tools/ScratchIsland/ScratchIsland.rc

@@ -0,0 +1,94 @@
+// Microsoft Visual C++ generated resource script.
+//
+#include "resource.h"
+
+#define APSTUDIO_READONLY_SYMBOLS
+/////////////////////////////////////////////////////////////////////////////
+//
+// Generated from the TEXTINCLUDE 2 resource.
+//
+#include "winres.h"
+
+/////////////////////////////////////////////////////////////////////////////
+#undef APSTUDIO_READONLY_SYMBOLS
+
+/////////////////////////////////////////////////////////////////////////////
+// English (United States) resources
+
+#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
+LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
+#pragma code_page(1252)
+
+#ifdef APSTUDIO_INVOKED
+/////////////////////////////////////////////////////////////////////////////
+//
+// TEXTINCLUDE
+//
+
+1 TEXTINCLUDE
+BEGIN
+    "resource.h\0"
+END
+
+2 TEXTINCLUDE
+BEGIN
+    "#include ""winres.h""\r\n"
+    "\0"
+END
+
+3 TEXTINCLUDE
+BEGIN
+    "\r\n"
+    "\0"
+END
+
+#endif    // APSTUDIO_INVOKED
+
+
+/////////////////////////////////////////////////////////////////////////////
+//
+// Icon
+//
+
+// Icon with lowest ID value placed first to ensure application icon
+// remains consistent on all systems.
+IDI_APPICON             ICON                    "..\\..\\..\\res\\terminal.ico"
+
+
+/////////////////////////////////////////////////////////////////////////////
+//
+// String Table
+//
+
+STRINGTABLE
+BEGIN
+    IDS_ERROR_DIALOG_TITLE  "Error"
+    IDS_HELP_DIALOG_TITLE  "Help"
+    IDS_ERROR_ARCHITECTURE_FORMAT
+                            "Windows Terminal is designed to run on your system's native architecture (%s).\nYou are currently using the %s version.\n\nPlease use the version of Windows Terminal that matches your system's native architecture."
+    IDS_X86_ARCHITECTURE    "i386"
+END
+
+STRINGTABLE
+BEGIN
+    IDS_AMD64_ARCHITECTURE  "AMD64"
+    IDS_ARM64_ARCHITECTURE  "ARM64"
+    IDS_ARM_ARCHITECTURE    "ARM"
+    IDS_UNKNOWN_ARCHITECTURE "Unknown"
+END
+
+#endif    // English (United States) resources
+/////////////////////////////////////////////////////////////////////////////
+
+
+
+#ifndef APSTUDIO_INVOKED
+/////////////////////////////////////////////////////////////////////////////
+//
+// Generated from the TEXTINCLUDE 3 resource.
+//
+
+
+/////////////////////////////////////////////////////////////////////////////
+#endif    // not APSTUDIO_INVOKED
+

src/tools/ScratchIsland/ScratchIsland.vcxproj

@@ -0,0 +1,175 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="..\..\..\packages\Microsoft.Toolkit.Win32.UI.XamlApplication.6.0.0\build\native\Microsoft.Toolkit.Win32.UI.XamlApplication.props" Condition="Exists('..\..\..\packages\Microsoft.Toolkit.Win32.UI.XamlApplication.6.0.0\build\native\Microsoft.Toolkit.Win32.UI.XamlApplication.props')" />
+
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>{23a1f736-cd19-4196-980f-84bcd50cf783}</ProjectGuid>
+    <Keyword>Win32Proj</Keyword>
+    <RootNamespace>ScratchIsland</RootNamespace>
+    <ProjectName>ScratchIsland</ProjectName>
+    <TargetName>ScratchIsland</TargetName>
+    <ConfigurationType>Application</ConfigurationType>
+    <OpenConsoleUniversalApp>false</OpenConsoleUniversalApp>
+    <ApplicationType>Windows Store</ApplicationType>
+    <WindowsStoreApp>true</WindowsStoreApp>
+    <WindowsAppContainer>false</WindowsAppContainer>
+    <!-- IMPORTANT! Xaml Islands only works on >= 17709 -->
+    <!-- IMPORTANT! cppwinrt.pre.props specifies 17134 -->
+    <WindowsTargetPlatformVersion>10.0.18362.0</WindowsTargetPlatformVersion>
+    <!-- DON'T REDIRECT OUR OUTPUT -->
+    <NoOutputRedirection>true</NoOutputRedirection>
+  </PropertyGroup>
+
+  <Import Project="..\..\..\common.openconsole.props" Condition="'$(OpenConsoleDir)'==''" />
+  <Import Project="$(OpenConsoleDir)src\cppwinrt.build.pre.props" />
+
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <SDLCheck>true</SDLCheck>
+    </ClCompile>
+  </ItemDefinitionGroup>
+
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <AdditionalIncludeDirectories>$(OpenConsoleDir)\src\inc;$(OpenConsoleDir)\dep;$(OpenConsoleDir)\dep\Console;$(OpenConsoleDir)\dep\Win32K;$(OpenConsoleDir)\dep\gsl\include;%(AdditionalIncludeDirectories);</AdditionalIncludeDirectories>
+    </ClCompile>
+    <ClCompile>
+      <!-- Manually include the generated TerminalCore header's path, because
+           adding a project reference will confuse msbuild, because TerminalCore
+           isn't a dll, it's a lib, and cppwinrt won't include a lib's header -->
+      <AdditionalIncludeDirectories>"$(OpenConsoleDir)src\cascadia\TerminalCore\lib\Generated Files";%(AdditionalIncludeDirectories);</AdditionalIncludeDirectories>
+    </ClCompile>
+    <Link>
+      <AdditionalDependencies>gdi32.lib;dwmapi.lib;Shcore.lib;UxTheme.lib;%(AdditionalDependencies)</AdditionalDependencies>
+    </Link>
+  </ItemDefinitionGroup>
+  <PropertyGroup>
+    <GenerateManifest>true</GenerateManifest>
+    <EmbedManifest>true</EmbedManifest>
+  </PropertyGroup>
+  <!-- Source Files -->
+  <ItemGroup>
+    <ClInclude Include="pch.h" />
+    <ClInclude Include="resource.h" />
+    <ClInclude Include="AppHost.h" />
+    <ClInclude Include="BaseWindow.h" />
+    <ClInclude Include="IslandWindow.h" />
+    <ClInclude Include="HostManager.h" />
+    <ClInclude Include="HostAndProcess.h" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="pch.cpp">
+      <PrecompiledHeader>Create</PrecompiledHeader>
+    </ClCompile>
+    <ClCompile Include="main.cpp" />
+    <ClCompile Include="AppHost.cpp" />
+    <ClCompile Include="IslandWindow.cpp" />
+    <ClCompile Include="HostManager.cpp" />
+    <ClCompile Include="HostAndProcess.cpp" />
+  </ItemGroup>
+  <ItemGroup>
+    <Midl Include="HostManager.idl" />
+    <Midl Include="HostAndProcess.idl" />
+  </ItemGroup>
+  <ItemGroup>
+    <ResourceCompile Include="ScratchIsland.rc" />
+  </ItemGroup>
+  <ItemGroup>
+    <Manifest Include="ScratchIsland.manifest" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <!-- Dependencies -->
+  <ItemGroup>
+    <!-- Even though we do have proper recursive dependencies, we want to keep some of these here
+         so that the AppX Manifest contains their activatable classes. -->
+    <!-- <ProjectReference Include="$(OpenConsoleDir)src\cascadia\TerminalSettings\TerminalSettings.vcxproj" /> -->
+    <!-- <ProjectReference Include="$(OpenConsoleDir)src\cascadia\TerminalControl\TerminalControl.vcxproj" /> -->
+    <!-- <ProjectReference Include="$(OpenConsoleDir)src\cascadia\TerminalConnection\TerminalConnection.vcxproj" /> -->
+
+    <!-- <ProjectReference Include="$(OpenConsoleDir)src\cascadia\TerminalApp\TerminalApp.vcxproj" /> -->
+
+    <ProjectReference Include="$(OpenConsoleDir)src\types\lib\types.vcxproj" />
+    <ProjectReference Include="..\ScratchWinRTServer\ScratchWinRTServer.vcxproj">
+      <Project>{d46d9547-f085-4645-b8f7-e8cd21559ab4}</Project>
+    </ProjectReference>
+  </ItemGroup>
+
+  <!--
+    This ItemGroup and the Globals PropertyGroup below it are required in order
+    to enable F5 debugging for the unpackaged application
+    -->
+  <ItemGroup>
+    <PropertyPageSchema Include="$(VCTargetsPath)$(LangID)\debugger_general.xml" />
+    <PropertyPageSchema Include="$(VCTargetsPath)$(LangID)\debugger_local_windows.xml" />
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <DebuggerFlavor>WindowsLocalDebugger</DebuggerFlavor>
+  </PropertyGroup>
+
+  <Import Project="$(OpenConsoleDir)src\cppwinrt.build.post.props" />
+
+  <Import Project="..\..\..\packages\Microsoft.UI.Xaml.2.5.0-prerelease.200609001\build\native\Microsoft.UI.Xaml.targets" Condition="Exists('..\..\..\packages\Microsoft.UI.Xaml.2.5.0-prerelease.200609001\build\native\Microsoft.UI.Xaml.targets')" />
+  <Import Project="..\..\..\packages\Microsoft.Toolkit.Win32.UI.XamlApplication.6.0.0\build\native\Microsoft.Toolkit.Win32.UI.XamlApplication.targets" Condition="Exists('..\..\..\packages\Microsoft.Toolkit.Win32.UI.XamlApplication.6.0.0\build\native\Microsoft.Toolkit.Win32.UI.XamlApplication.targets')" />
+  <Import Project="..\..\..\packages\Microsoft.VCRTForwarders.140.1.0.1-rc\build\native\Microsoft.VCRTForwarders.140.targets" Condition="Exists('..\..\..\packages\Microsoft.VCRTForwarders.140.1.0.1-rc\build\native\Microsoft.VCRTForwarders.140.targets')" />
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('..\..\..\packages\Microsoft.UI.Xaml.2.5.0-prerelease.200609001\build\native\Microsoft.UI.Xaml.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\Microsoft.UI.Xaml.2.5.0-prerelease.200609001\build\native\Microsoft.UI.Xaml.targets'))" />
+    <Error Condition="!Exists('..\..\..\packages\Microsoft.Toolkit.Win32.UI.XamlApplication.6.0.0\build\native\Microsoft.Toolkit.Win32.UI.XamlApplication.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\Microsoft.Toolkit.Win32.UI.XamlApplication.6.0.0\build\native\Microsoft.Toolkit.Win32.UI.XamlApplication.props'))" />
+    <Error Condition="!Exists('..\..\..\packages\Microsoft.Toolkit.Win32.UI.XamlApplication.6.0.0\build\native\Microsoft.Toolkit.Win32.UI.XamlApplication.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\Microsoft.Toolkit.Win32.UI.XamlApplication.6.0.0\build\native\Microsoft.Toolkit.Win32.UI.XamlApplication.targets'))" />
+    <Error Condition="!Exists('..\..\..\packages\Microsoft.VCRTForwarders.140.1.0.1-rc\build\native\Microsoft.VCRTForwarders.140.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\Microsoft.VCRTForwarders.140.1.0.1-rc\build\native\Microsoft.VCRTForwarders.140.targets'))" />
+    <Error Condition="!Exists('..\..\..\packages\Terminal.ThemeHelpers.0.2.200324001\build\native\Terminal.ThemeHelpers.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\Terminal.ThemeHelpers.0.2.200324001\build\native\Terminal.ThemeHelpers.targets'))" />
+  </Target>
+
+  <!-- Override GetPackagingOutputs to roll up all our dependencies.
+       This ensures that when the WAP packaging project asks what files go into
+       the package, we tell it.
+       This is a heavily stripped version of the one in Microsoft.*.AppxPackage.targets.
+  -->
+  <PropertyGroup>
+    <_ContinueOnError Condition="'$(BuildingProject)' == 'true'">true</_ContinueOnError>
+    <_ContinueOnError Condition="'$(BuildingProject)' != 'true'">false</_ContinueOnError>
+  </PropertyGroup>
+  <Target Name="GetPackagingOutputs" Returns="@(PackagingOutputs)">
+    <MSBuild
+      Projects="@(ProjectReferenceWithConfiguration)"
+      Targets="GetPackagingOutputs"
+      BuildInParallel="$(BuildInParallel)"
+      Properties="%(ProjectReferenceWithConfiguration.SetConfiguration); %(ProjectReferenceWithConfiguration.SetPlatform)"
+      Condition="'@(ProjectReferenceWithConfiguration)' != ''
+                 and '%(ProjectReferenceWithConfiguration.BuildReference)' == 'true'
+                 and '%(ProjectReferenceWithConfiguration.ReferenceOutputAssembly)' == 'true'"
+      ContinueOnError="$(_ContinueOnError)">
+      <Output TaskParameter="TargetOutputs" ItemName="_PackagingOutputsFromOtherProjects"/>
+    </MSBuild>
+
+    <ItemGroup>
+      <PackagingOutputs Include="@(_PackagingOutputsFromOtherProjects)" />
+    </ItemGroup>
+
+    <!-- **BEGIN VC LIBS HACK** -->
+    <PropertyGroup>
+      <ReasonablePlatform Condition="'$(Platform)'=='Win32'">x86</ReasonablePlatform>
+      <ReasonablePlatform Condition="'$(ReasonablePlatform)'==''">$(Platform)</ReasonablePlatform>
+    </PropertyGroup>
+
+    <ItemGroup Condition="'$(ScratchIslandOfficialBuild)'=='true'">
+      <!-- Add all the CRT libs as content; these must be inside a Target as they are wildcards. -->
+      <_OpenConsoleVCLibToCopy Include="$(VCToolsRedistInstallDir)\$(ReasonablePlatform)\Microsoft.VC142.CRT\*.dll" />
+
+      <PackagingOutputs Include="@(_OpenConsoleVCLibToCopy)">
+        <ProjectName>$(ProjectName)</ProjectName>
+        <OutputGroup>BuiltProjectOutputGroup</OutputGroup>
+        <TargetPath>%(Filename)%(Extension)</TargetPath>
+      </PackagingOutputs>
+    </ItemGroup>
+    <!-- **END VC LIBS HACK** -->
+  </Target>
+
+  <!-- <Import Project="$(OpenConsoleDir)\build\rules\GenerateSxsManifestsFromWinmds.targets" /> -->
+  <Import Project="..\..\..\packages\Terminal.ThemeHelpers.0.2.200324001\build\native\Terminal.ThemeHelpers.targets" Condition="Exists('..\..\..\packages\Terminal.ThemeHelpers.0.2.200324001\build\native\Terminal.ThemeHelpers.targets')" />
+</Project>
+

src/tools/ScratchIsland/main.cpp

@@ -0,0 +1,54 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
+#include "pch.h"
+#include "AppHost.h"
+#include "resource.h"
+
+using namespace winrt;
+using namespace winrt::Windows::UI;
+using namespace winrt::Windows::UI::Composition;
+using namespace winrt::Windows::UI::Xaml::Hosting;
+using namespace winrt::Windows::Foundation::Numerics;
+
+int __stdcall wWinMain(HINSTANCE, HINSTANCE, LPWSTR, int)
+{
+    // If Terminal is spawned by a shortcut that requests that it run in a new process group
+    // while attached to a console session, that request is nonsense. That request will, however,
+    // cause WT to start with Ctrl-C disabled. This wouldn't matter, because it's a Windows-subsystem
+    // application. Unfortunately, that state is heritable. In short, if you start WT using cmd in
+    // a weird way, ^C stops working _inside_ the terminal. Mad.
+    SetConsoleCtrlHandler(NULL, FALSE);
+
+    // Make sure to call this so we get WM_POINTER messages.
+    EnableMouseInPointer(true);
+
+    // !!! LOAD BEARING !!!
+    // We must initialize the main thread as a single-threaded apartment before
+    // constructing any Xaml objects. Failing to do so will cause some issues
+    // in accessibility somewhere down the line when a UIAutomation object will
+    // be queried on the wrong thread at the wrong time.
+    // We used to initialize as STA only _after_ initializing the application
+    // host, which loaded the settings. The settings needed to be loaded in MTA
+    // because we were using the Windows.Storage APIs. Since we're no longer
+    // doing that, we can safely init as STA before any WinRT dispatches.
+    winrt::init_apartment(winrt::apartment_type::single_threaded);
+
+    // Create the AppHost object, which will create both the window and the
+    // Terminal App. This MUST BE constructed before the Xaml manager as TermApp
+    // provides an implementation of Windows.UI.Xaml.Application.
+    AppHost host;
+
+    // Initialize the xaml content. This must be called AFTER the
+    // WindowsXamlManager is initialized.
+    host.Initialize();
+
+    MSG message;
+
+    while (GetMessage(&message, nullptr, 0, 0))
+    {
+        TranslateMessage(&message);
+        DispatchMessage(&message);
+    }
+    return 0;
+}

src/tools/ScratchIsland/packages.config

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Microsoft.Windows.CppWinRT" version="2.0.200316.3" targetFramework="native" />
+  <package id="Microsoft.Toolkit.Win32.UI.XamlApplication" version="6.0.0" targetFramework="native" />
+  <package id="Microsoft.UI.Xaml" version="2.5.0-prerelease.200609001" targetFramework="native" />
+  <package id="Microsoft.VCRTForwarders.140" version="1.0.1-rc" targetFramework="native" />
+  <package id="Terminal.ThemeHelpers" version="0.2.200324001" targetFramework="native" />
+</packages>

src/tools/ScratchIsland/pch.cpp

@@ -0,0 +1,4 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT license.
+
+#include "pch.h"

src/tools/ScratchIsland/pch.h

@@ -0,0 +1,92 @@
+/*++
+Copyright (c) Microsoft Corporation
+Licensed under the MIT license.
+
+Module Name:
+- pch.h
+
+Abstract:
+- Contains external headers to include in the precompile phase of console build process.
+- Avoid including internal project headers. Instead include them only in the classes that need them (helps with test project building).
+--*/
+
+#pragma once
+
+// Ignore checked iterators warning from VC compiler.
+#define _SCL_SECURE_NO_WARNINGS
+
+// Block minwindef.h min/max macros to prevent <algorithm> conflict
+#define NOMINMAX
+
+#define WIN32_LEAN_AND_MEAN
+#include <unknwn.h>
+
+#define NT_SUCCESS(Status) (((NTSTATUS)(Status)) >= 0)
+
+#include <windows.h>
+#include <UIAutomation.h>
+#include <cstdlib>
+#include <cstring>
+#include <shellscalingapi.h>
+#include <windowsx.h>
+
+// Manually include til after we include Windows.Foundation to give it winrt superpowers
+#define BLOCK_TIL
+#include "../inc/LibraryIncludes.h"
+
+// This is inexplicable, but for whatever reason, cppwinrt conflicts with the
+//      SDK definition of this function, so the only fix is to undef it.
+// from WinBase.h
+// Windows::UI::Xaml::Media::Animation::IStoryboard::GetCurrentTime
+#ifdef GetCurrentTime
+#undef GetCurrentTime
+#endif
+
+#include <wil/cppwinrt.h>
+
+// Needed just for XamlIslands to work at all:
+#include <winrt/Windows.system.h>
+#include <winrt/Windows.Foundation.Collections.h>
+#include <winrt/windows.ui.core.h>
+#include <winrt/Windows.UI.Xaml.Hosting.h>
+#include <windows.ui.xaml.hosting.desktopwindowxamlsource.h>
+
+// Additional headers for various xaml features. We need:
+//  * Controls for grid
+//  * Media for ScaleTransform
+#include <winrt/Windows.UI.Xaml.Controls.h>
+#include <winrt/Windows.ui.xaml.media.h>
+#include <windows.ui.xaml.media.dxinterop.h>
+
+#include <wil/resource.h>
+#include <wil/win32_helpers.h>
+
+// Including TraceLogging essentials for the binary
+#include <TraceLoggingProvider.h>
+#include <winmeta.h>
+TRACELOGGING_DECLARE_PROVIDER(g_hWindowsTerminalProvider);
+#include <telemetry\ProjectTelemetry.h>
+#include <TraceLoggingActivity.h>
+
+// For commandline argument processing
+#include <shellapi.h>
+#include <processenv.h>
+
+#include <dcomp.h>
+
+#include <dxgi.h>
+#include <dxgi1_2.h>
+#include <dxgi1_3.h>
+
+#include <d3d11.h>
+#include <d2d1.h>
+#include <d2d1_1.h>
+#include <d2d1_2.h>
+#include <d2d1_3.h>
+#include <d2d1helper.h>
+#include <dwrite.h>
+#include <dwrite_1.h>
+#include <dwrite_2.h>
+#include <dwrite_3.h>
+
+#include "til.h"

src/tools/ScratchIsland/resource.h

@@ -0,0 +1,24 @@
+//{{NO_DEPENDENCIES}}
+// Microsoft Visual C++ generated include file.
+// Used by WindowsTerminal.rc
+//
+#define IDI_APPICON 101
+#define IDS_ERROR_DIALOG_TITLE 105
+#define IDS_HELP_DIALOG_TITLE 106
+#define IDS_ERROR_ARCHITECTURE_FORMAT 110
+#define IDS_X86_ARCHITECTURE 111
+#define IDS_AMD64_ARCHITECTURE 112
+#define IDS_ARM64_ARCHITECTURE 113
+#define IDS_ARM_ARCHITECTURE 114
+#define IDS_UNKNOWN_ARCHITECTURE 115
+
+// Next default values for new objects
+//
+#ifdef APSTUDIO_INVOKED
+#ifndef APSTUDIO_READONLY_SYMBOLS
+#define _APS_NEXT_RESOURCE_VALUE 104
+#define _APS_NEXT_COMMAND_VALUE 40001
+#define _APS_NEXT_CONTROL_VALUE 1001
+#define _APS_NEXT_SYMED_VALUE 101
+#endif
+#endif

src/tools/ScratchWinRTServer/HostClass.cpp

@@ -0,0 +1,261 @@
+#include "pch.h"
+#include <argb.h>
+#include <DefaultSettings.h>
+#include "HostClass.h"
+#include "HostClass.g.cpp"
+
+// #include <wrl.h>
+extern std::mutex m;
+extern std::condition_variable cv;
+extern bool dtored;
+
+using namespace ::Microsoft::Console::Types;
+using namespace ::Microsoft::Terminal::Core;
+using namespace winrt::Windows::UI::Xaml;
+using namespace winrt::Windows::UI::Xaml::Input;
+using namespace winrt::Windows::UI::Xaml::Automation::Peers;
+using namespace winrt::Windows::UI::Core;
+using namespace winrt::Windows::UI::ViewManagement;
+using namespace winrt::Windows::UI::Input;
+using namespace winrt::Windows::System;
+using namespace winrt::Microsoft::Terminal::Settings;
+// using namespace winrt::Windows::ApplicationModel::DataTransfer;
+
+namespace winrt::ScratchWinRTServer::implementation
+{
+    HostClass::HostClass(const winrt::guid& g) :
+        _id{ g },
+        _desiredFont{ DEFAULT_FONT_FACE, 0, DEFAULT_FONT_WEIGHT, { 0, DEFAULT_FONT_SIZE }, CP_UTF8 },
+        _actualFont{ DEFAULT_FONT_FACE, 0, DEFAULT_FONT_WEIGHT, { 0, DEFAULT_FONT_SIZE }, CP_UTF8, false }
+    {
+        _terminal = std::make_unique<::Microsoft::Terminal::Core::Terminal>();
+        _settings = winrt::Microsoft::Terminal::Settings::TerminalSettings();
+
+        auto fontSize = _settings.FontSize();
+        const auto newSize = std::max<short>(gsl::narrow_cast<short>(fontSize), 1);
+        const auto fontFace = _settings.FontFace();
+        const auto fontWeight = _settings.FontWeight();
+        _actualFont = { fontFace, 0, fontWeight.Weight, { 0, newSize }, CP_UTF8, false };
+        _desiredFont = { _actualFont };
+    }
+
+    HostClass::~HostClass()
+    {
+        printf("~HostClass()\n");
+        std::unique_lock<std::mutex> lk(m);
+        dtored = true;
+        cv.notify_one();
+    }
+
+    winrt::guid HostClass::Id()
+    {
+        return _id;
+    }
+
+    void HostClass::Attach(Windows::UI::Xaml::Controls::SwapChainPanel panel)
+    {
+        printf("Hey dummy, we're not using Attach() anymore\n");
+    }
+
+    void HostClass::BeginRendering()
+    {
+        _InitializeTerminal();
+    }
+
+    void HostClass::RenderEngineSwapChainChanged()
+    {
+        // This event is only registered during terminal initialization,
+        // so we don't need to check _initializedTerminal.
+        // We also don't lock for things that come back from the renderer.
+        auto chainHandle = _renderEngine->GetSwapChainHandle();
+        auto weakThis{ get_weak() };
+
+        // co_await winrt::resume_foreground(Dispatcher());
+
+        if (auto control{ weakThis.get() })
+        {
+            _AttachDxgiSwapChainToXaml(chainHandle);
+        }
+    }
+
+    void HostClass::_AttachDxgiSwapChainToXaml(HANDLE swapChainHandle)
+    {
+        // NOPE DONT DO THIS
+        // auto nativePanel = _panel.as<ISwapChainPanelNative2>();
+        // nativePanel->SetSwapChainHandle(swapChainHandle);
+    }
+
+    void HostClass::ThisIsInsane(uint64_t swapchainHandle)
+    {
+        HANDLE foo = (HANDLE)swapchainHandle;
+        _hSwapchain.reset(foo);
+        // _hSwapchain.put((HANDLE)swapchainHandle);
+        // _hSwapchain = (HANDLE)swapchainHandle;
+    }
+
+    bool HostClass::_InitializeTerminal()
+    {
+        { // scope for terminalLock
+            auto terminalLock = _terminal->LockForWriting();
+
+            if (_initializedTerminal)
+            {
+                return false;
+            }
+
+            // const auto actualWidth = _panel.ActualWidth();
+            // const auto actualHeight = _panel.ActualHeight();
+            // const auto windowWidth = actualWidth * _panel.CompositionScaleX(); // Width() and Height() are NaN?
+            // const auto windowHeight = actualHeight * _panel.CompositionScaleY();
+
+            const auto actualWidth = 400; //_panel.ActualWidth();
+            const auto actualHeight = 150; //_panel.ActualHeight();
+            const auto windowWidth = 400.0; // actualWidth * _panel.CompositionScaleX(); // Width() and Height() are NaN?
+            const auto windowHeight = 150.0; // actualHeight * _panel.CompositionScaleY();
+
+            if (windowWidth == 0 || windowHeight == 0)
+            {
+                return false;
+            }
+
+            // First create the render thread.
+            // Then stash a local pointer to the render thread so we can initialize it and enable it
+            // to paint itself *after* we hand off its ownership to the renderer.
+            // We split up construction and initialization of the render thread object this way
+            // because the renderer and render thread have circular references to each other.
+            auto renderThread = std::make_unique<::Microsoft::Console::Render::RenderThread>();
+            auto* const localPointerToThread = renderThread.get();
+
+            // Now create the renderer and initialize the render thread.
+            _renderer = std::make_unique<::Microsoft::Console::Render::Renderer>(_terminal.get(), nullptr, 0, std::move(renderThread));
+            ::Microsoft::Console::Render::IRenderTarget& renderTarget = *_renderer;
+
+            // _renderer->SetRendererEnteredErrorStateCallback([weakThis = get_weak()]() {
+            //     if (auto strongThis{ weakThis.get() })
+            //     {
+            //         strongThis->_RendererEnteredErrorState();
+            //     }
+            // });
+
+            THROW_IF_FAILED(localPointerToThread->Initialize(_renderer.get()));
+
+            // Set up the DX Engine
+            auto dxEngine = std::make_unique<::Microsoft::Console::Render::DxEngine>();
+            dxEngine->_swapChainHandle.swap(_hSwapchain);
+            _renderer->AddRenderEngine(dxEngine.get());
+
+            // Initialize our font with the renderer
+            // We don't have to care about DPI. We'll get a change message immediately if it's not 96
+            // and react accordingly.
+            // _UpdateFont(true); // <-- TODO
+            _renderer->TriggerFontChange(96, _desiredFont, _actualFont); // "UpdateFont"
+
+            const COORD windowSize{ static_cast<short>(windowWidth), static_cast<short>(windowHeight) };
+
+            // Fist set up the dx engine with the window size in pixels.
+            // Then, using the font, get the number of characters that can fit.
+            // Resize our terminal connection to match that size, and initialize the terminal with that size.
+            const auto viewInPixels = Viewport::FromDimensions({ 0, 0 }, windowSize);
+            THROW_IF_FAILED(dxEngine->SetWindowSize({ viewInPixels.Width(), viewInPixels.Height() }));
+
+            // Update DxEngine's SelectionBackground
+            // dxEngine->SetSelectionBackground(_settings.SelectionBackground());
+
+            const auto vp = dxEngine->GetViewportInCharacters(viewInPixels);
+            const auto width = vp.Width();
+            const auto height = vp.Height();
+            // _connection.Resize(height, width); // <-- TODO
+
+            // Override the default width and height to match the size of the swapChainPanel
+            // _settings.InitialCols(width); // <-- TODO
+            // _settings.InitialRows(height); // <-- TODO
+            _settings.DefaultBackground(til::color{ 255, 0, 255, 255 }); //rgba
+            _settings.DefaultForeground(til::color{ 0, 0, 0, 255 }); //rgba
+            _terminal->CreateFromSettings(_settings, renderTarget); // <-- TODO
+
+            dxEngine->SetRetroTerminalEffects(false);
+            dxEngine->SetForceFullRepaintRendering(false);
+            dxEngine->SetSoftwareRendering(false);
+
+            // // Update DxEngine's AntialiasingMode
+            // switch (_settings.AntialiasingMode())
+            // {
+            // case TextAntialiasingMode::Cleartype:
+            //     dxEngine->SetAntialiasingMode(D2D1_TEXT_ANTIALIAS_MODE_CLEARTYPE);
+            //     break;
+            // case TextAntialiasingMode::Aliased:
+            //     dxEngine->SetAntialiasingMode(D2D1_TEXT_ANTIALIAS_MODE_ALIASED);
+            //     break;
+            // case TextAntialiasingMode::Grayscale:
+            // default:
+            //     dxEngine->SetAntialiasingMode(D2D1_TEXT_ANTIALIAS_MODE_GRAYSCALE);
+            //     break;
+            // }
+
+            // // GH#5098: Inform the engine of the opacity of the default text background.
+            // if (_settings.UseAcrylic())
+            // {
+            //     dxEngine->SetDefaultTextBackgroundOpacity(::base::saturated_cast<float>(_settings.TintOpacity()));
+            // }
+
+            THROW_IF_FAILED(dxEngine->Enable());
+            _renderEngine = std::move(dxEngine);
+
+            // _AttachDxgiSwapChainToXaml(_renderEngine->GetSwapChainHandle());
+
+            // Tell the DX Engine to notify us when the swap chain changes.
+            // We do this after we initially set the swapchain so as to avoid unnecessary callbacks (and locking problems)
+            _renderEngine->SetCallback(std::bind(&HostClass::RenderEngineSwapChainChanged, this));
+
+            // auto bottom = _terminal->GetViewport().BottomExclusive();
+            // auto bufferHeight = bottom;
+
+            // ScrollBar().Maximum(bufferHeight - bufferHeight);
+            // ScrollBar().Minimum(0);
+            // ScrollBar().Value(0);
+            // ScrollBar().ViewportSize(bufferHeight);
+
+            localPointerToThread->EnablePainting();
+
+            // // Set up blinking cursor
+            // int blinkTime = GetCaretBlinkTime();
+            // if (blinkTime != INFINITE)
+            // {
+            //     // Create a timer
+            //     DispatcherTimer cursorTimer;
+            //     cursorTimer.Interval(std::chrono::milliseconds(blinkTime));
+            //     cursorTimer.Tick({ get_weak(), &TermControl::_CursorTimerTick });
+            //     cursorTimer.Start();
+            //     _cursorTimer.emplace(std::move(cursorTimer));
+            // }
+            // else
+            // {
+            //     // The user has disabled cursor blinking
+            //     _cursorTimer = std::nullopt;
+            // }
+
+            // // import value from WinUser (convert from milli-seconds to micro-seconds)
+            // _multiClickTimer = GetDoubleClickTime() * 1000;
+
+            // // Focus the control here. If we do it during control initialization, then
+            // //      focus won't actually get passed to us. I believe this is because
+            // //      we're not technically a part of the UI tree yet, so focusing us
+            // //      becomes a no-op.
+            // this->Focus(FocusState::Programmatic);
+
+            _initializedTerminal = true;
+        } // scope for TerminalLock
+
+        // Start the connection outside of lock, because it could
+        // start writing output immediately.
+        // _connection.Start(); // <-- TODO
+
+        // Likewise, run the event handlers outside of lock (they could
+        // be reentrant)
+        // _InitializedHandlers(*this, nullptr);
+
+        _terminal->Write(L"Hello world from another process");
+        return true;
+    }
+
+}

src/tools/ScratchWinRTServer/HostClass.h

@@ -0,0 +1,52 @@
+#pragma once
+
+#include "HostClass.g.h"
+#include <winrt/Microsoft.Terminal.TerminalConnection.h>
+#include <winrt/Microsoft.Terminal.Settings.h>
+#include "../../renderer/base/Renderer.hpp"
+#include "../../renderer/dx/DxRenderer.hpp"
+#include "../../renderer/uia/UiaRenderer.hpp"
+#include "../../cascadia/TerminalCore/Terminal.hpp"
+
+namespace winrt::ScratchWinRTServer::implementation
+{
+    struct HostClass : HostClassT<HostClass>
+    {
+        HostClass(const winrt::guid& g);
+        ~HostClass();
+        void DoTheThing();
+
+        void Attach(Windows::UI::Xaml::Controls::SwapChainPanel panel);
+        void BeginRendering();
+
+        void RenderEngineSwapChainChanged();
+
+        void ThisIsInsane(uint64_t swapchainHandle);
+
+    private:
+        int _DoCount{ 0 };
+        winrt::guid _id;
+        wil::unique_handle _hSwapchain{ INVALID_HANDLE_VALUE };
+        Windows::UI::Xaml::Controls::SwapChainPanel _panel{ nullptr };
+
+        bool _initializedTerminal{ false };
+        winrt::Microsoft::Terminal::TerminalConnection::ITerminalConnection _connection;
+        std::unique_ptr<::Microsoft::Terminal::Core::Terminal> _terminal;
+        FontInfoDesired _desiredFont;
+        FontInfo _actualFont;
+
+        std::unique_ptr<::Microsoft::Console::Render::Renderer> _renderer;
+        std::unique_ptr<::Microsoft::Console::Render::DxEngine> _renderEngine;
+        winrt::Microsoft::Terminal::Settings::IControlSettings _settings;
+        void _AttachDxgiSwapChainToXaml(HANDLE swapChainHandle);
+
+        bool _InitializeTerminal();
+    };
+}
+
+namespace winrt::ScratchWinRTServer::factory_implementation
+{
+    struct HostClass : HostClassT<HostClass, implementation::HostClass>
+    {
+    };
+}

src/tools/ScratchWinRTServer/HostClass.idl

@@ -0,0 +1,15 @@
+
+
+namespace ScratchWinRTServer
+{
+    [default_interface] runtimeclass HostClass {
+        HostClass(Guid g);
+
+        Guid Id { get; };
+
+        void Attach(Windows.UI.Xaml.Controls.SwapChainPanel panel);
+        void BeginRendering();
+
+        void ThisIsInsane(UInt64 swapchainHandle);
+    };
+}

src/tools/ScratchWinRTServer/IMyComInterface.h

@@ -0,0 +1,6 @@
+#pragma once
+
+struct __declspec(uuid("28578d33-c090-4279-9669-dbeea3f24bb0")) IMyComInterface : ::IUnknown
+{
+    virtual HRESULT __stdcall Call() = 0;
+};

src/tools/ScratchWinRTServer/IMyComInterface.idl

@@ -0,0 +1,9 @@
+
+// [
+//     uuid("BB64926F-1A4D-470D-BB8A-3D2CC4B035E4"),
+//     object,
+//     local
+// ] interface IMyComInterface : IUnknown
+// {
+//     HRESULT MyMethod();
+// };

src/tools/ScratchWinRTServer/IScratchInterface.idl

@@ -0,0 +1,11 @@
+
+
+namespace ScratchWinRTServer
+{
+    // [default_interface]
+    interface IScratchInterface
+    {
+        String DoTheThing();
+    };
+
+}

src/tools/ScratchWinRTServer/PropertySheet.props

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ImportGroup Label="PropertySheets" />
+  <PropertyGroup Label="UserMacros" />
+    <!--
+    To customize common C++/WinRT project properties: 
+    * right-click the project node
+    * expand the Common Properties item
+    * select the C++/WinRT property page
+
+    For more advanced scenarios, and complete documentation, please see:
+    https://github.com/Microsoft/cppwinrt/tree/master/nuget 
+    -->
+  <PropertyGroup />
+  <ItemDefinitionGroup />
+</Project>

src/tools/ScratchWinRTServer/ScratchClass.cpp

@@ -0,0 +1,11 @@
+#include "pch.h"
+#include "ScratchClass.h"
+
+#include "ScratchClass.g.cpp"
+namespace winrt::ScratchWinRTServer::implementation
+{
+    ScratchClass::ScratchClass()
+    {
+    }
+
+}

src/tools/ScratchWinRTServer/ScratchClass.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "ScratchClass.g.h"
+namespace winrt::ScratchWinRTServer::implementation
+{
+    struct ScratchClass : public ScratchClassT<ScratchClass>
+    {
+        ScratchClass();
+        hstring DoTheThing()
+        {
+            return L"Hello there";
+        }
+    };
+}
+
+namespace winrt::ScratchWinRTServer::factory_implementation
+{
+    struct ScratchClass : ScratchClassT<ScratchClass, implementation::ScratchClass>
+    {
+    };
+}

src/tools/ScratchWinRTServer/ScratchClass.idl

@@ -0,0 +1,15 @@
+
+
+namespace ScratchWinRTServer
+{
+    [default_interface] runtimeclass ScratchClass // : IScratchInterface
+    {
+        ScratchClass();
+        String DoTheThing();
+
+        // Adding a Windows.UI.Xaml element will crash the server when the
+        // server tries to instantiate the element without a XAML host.
+        //
+        // Windows.UI.Xaml.Controls.Button MyButton { get; };
+    };
+}

src/tools/ScratchWinRTServer/ScratchWinRTServer.manifest

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8" standalone="yes"?>
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+        <!-- Windows 10 1903 -->
+        <!-- See https://docs.microsoft.com/en-us/windows/apps/desktop/modernize/xaml-islands -->
+        <!-- "maxversiontested" is CASE SENSITIVE. Do not change this.-->
+        <maxversiontested Id="10.0.18362.0"/>
+        <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
+    </application>
+  </compatibility>
+
+  <application xmlns="urn:schemas-microsoft-com:asm.v3">
+    <windowsSettings>
+      <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2</dpiAwareness>
+      <longPathAware xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">true</longPathAware>
+    </windowsSettings>
+  </application>
+
+  <file name="ScratchWinRTServer.exe" hashalg="SHA1">
+    <activatableClass name="ScratchWinRTServer.ScratchClass" threadingModel="both" xmlns="urn:schemas-microsoft-com:winrt.v1"></activatableClass>
+  </file>
+  <file name="TerminalSettings.dll" hashalg="SHA1">
+    <activatableClass name="Microsoft.Terminal.Settings.TerminalSettings" threadingModel="both" xmlns="urn:schemas-microsoft-com:winrt.v1"></activatableClass>
+  </file>
+
+</assembly>

src/tools/ScratchWinRTServer/ScratchWinRTServer.vcxproj

@@ -0,0 +1,179 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="..\..\..\packages\Microsoft.Windows.CppWinRT.2.0.200609.3\build\native\Microsoft.Windows.CppWinRT.props" Condition="Exists('..\..\..\packages\Microsoft.Windows.CppWinRT.2.0.200609.3\build\native\Microsoft.Windows.CppWinRT.props')" />
+  <PropertyGroup Label="Globals">
+    <CppWinRTOptimized>true</CppWinRTOptimized>
+    <CppWinRTRootNamespaceAutoMerge>true</CppWinRTRootNamespaceAutoMerge>
+    <CppWinRTGenerateWindowsMetadata>true</CppWinRTGenerateWindowsMetadata>
+    <MinimalCoreWin>true</MinimalCoreWin>
+    <VCProjectVersion>15.0</VCProjectVersion>
+    <ProjectGuid>{d46d9547-f085-4645-b8f7-e8cd21559ab4}</ProjectGuid>
+    <Keyword>Win32Proj</Keyword>
+    <RootNamespace>ScratchWinRTServer</RootNamespace>
+    <WindowsTargetPlatformVersion Condition=" '$(WindowsTargetPlatformVersion)' == '' ">10.0.18362.0</WindowsTargetPlatformVersion>
+    <WindowsTargetPlatformMinVersion>10.0.17134.0</WindowsTargetPlatformMinVersion>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <PlatformToolset>v140</PlatformToolset>
+    <PlatformToolset Condition="'$(VisualStudioVersion)' == '15.0'">v141</PlatformToolset>
+    <PlatformToolset Condition="'$(VisualStudioVersion)' == '16.0'">v142</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)'=='Debug'" Label="Configuration">
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <LinkIncremental>true</LinkIncremental>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)'=='Release'" Label="Configuration">
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+    <LinkIncremental>false</LinkIncremental>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <ImportGroup Label="ExtensionSettings">
+  </ImportGroup>
+  <ImportGroup Label="Shared">
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
+  <ImportGroup Label="PropertySheets">
+    <Import Project="PropertySheet.props" />
+  </ImportGroup>
+  <PropertyGroup Label="UserMacros" />
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <PrecompiledHeader>Use</PrecompiledHeader>
+      <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+      <PrecompiledHeaderOutputFile>$(IntDir)pch.pch</PrecompiledHeaderOutputFile>
+      <PreprocessorDefinitions>_CONSOLE;WIN32_LEAN_AND_MEAN;WINRT_LEAN_AND_MEAN;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <WarningLevel>Level4</WarningLevel>
+      <AdditionalOptions>%(AdditionalOptions) /permissive- /bigobj</AdditionalOptions>
+    </ClCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)'=='Debug'">
+    <ClCompile>
+      <Optimization>Disabled</Optimization>
+      <PreprocessorDefinitions>_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <GenerateWindowsMetadata>false</GenerateWindowsMetadata>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Platform)'=='Win32'">
+    <ClCompile>
+      <PreprocessorDefinitions>WIN32;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </ClCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)'=='Release'">
+    <ClCompile>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <GenerateWindowsMetadata>false</GenerateWindowsMetadata>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemGroup>
+    <ClInclude Include="pch.h" />
+    <ClInclude Include="ScratchClass.h" />
+    <ClInclude Include="HostClass.h" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="ScratchClass.cpp" />
+    <ClCompile Include="HostClass.cpp" />
+    <ClCompile Include="main.cpp" />
+    <ClCompile Include="pch.cpp">
+      <PrecompiledHeader>Create</PrecompiledHeader>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+    <None Include="PropertySheet.props" />
+    <Text Include="readme.txt">
+      <DeploymentContent>false</DeploymentContent>
+    </Text>
+  </ItemGroup>
+  <ItemGroup>
+    <Midl Include="IScratchInterface.idl" />
+    <Midl Include="ScratchClass.idl" />
+    <Midl Include="HostClass.idl" />
+    <!-- <Midl Include="IMyComInterface.idl" /> -->
+  </ItemGroup>
+  <ItemGroup>
+    <Manifest Include="ScratchWinRTServer.manifest" />
+  </ItemGroup>
+
+
+  <ItemGroup>
+<!--     <ProjectReference Include="..\ScratchWinRTServer\ScratchWinRTServer.vcxproj">
+      <Project>{d46d9547-f085-4645-b8f7-e8cd21559ab4}</Project>
+    </ProjectReference> -->
+    <ProjectReference Include="$(SolutionDir)src\types\lib\types.vcxproj" />
+
+        <ProjectReference Include="$(SolutionDir)src\buffer\out\lib\bufferout.vcxproj" />
+    <ProjectReference Include="$(SolutionDir)src\renderer\base\lib\base.vcxproj" />
+    <ProjectReference Include="$(SolutionDir)src\renderer\dx\lib\dx.vcxproj" />
+    <ProjectReference Include="$(SolutionDir)src\renderer\uia\lib\uia.vcxproj" />
+    <ProjectReference Include="$(SolutionDir)src\terminal\parser\lib\parser.vcxproj" />
+    <ProjectReference Include="$(SolutionDir)src\terminal\input\lib\terminalinput.vcxproj" />
+    <ProjectReference Include="$(SolutionDir)src\cascadia\TerminalSettings\TerminalSettings.vcxproj">
+      <Private>false</Private>
+      <CopyLocalSatelliteAssemblies>false</CopyLocalSatelliteAssemblies>
+    </ProjectReference>
+    <ProjectReference Include="$(SolutionDir)src\cascadia\TerminalCore\lib\TerminalCore-lib.vcxproj" />
+    <ProjectReference Include="$(SolutionDir)src\cascadia\TerminalConnection\TerminalConnection.vcxproj">
+      <Private>false</Private>
+      <CopyLocalSatelliteAssemblies>false</CopyLocalSatelliteAssemblies>
+    </ProjectReference>
+  </ItemGroup>
+  <!-- ====================== Compiler & Linker Flags ===================== -->
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <AdditionalIncludeDirectories>$(SolutionDir)\src\inc;$(SolutionDir)\dep;$(SolutionDir)\dep\Console;$(SolutionDir)\dep\Win32K;$(SolutionDir)\dep\gsl\include;$(SolutionDir)\dep\wil\include;$(SolutionDir)\oss\chromium;$(SolutionDir)\oss\fmt\include;$(SolutionDir)\oss\dynamic_bitset;$(SolutionDir)\oss\libpopcnt;%(AdditionalIncludeDirectories);</AdditionalIncludeDirectories>
+      <!-- <AdditionalIncludeDirectories>$(SolutionDir)\src\inc;%(AdditionalIncludeDirectories);</AdditionalIncludeDirectories> -->
+      <!-- Manually disable unreachable code warning, because jconcpp has a ton of that. -->
+    </ClCompile>
+    <Link>
+      <AdditionalDependencies>onecoreuap_apiset.lib;d3dcompiler.lib;dwmapi.lib;uxtheme.lib;shlwapi.lib;ntdll.lib;dcomp.lib;%(AdditionalDependencies)</AdditionalDependencies>
+    </Link>
+  </ItemDefinitionGroup>
+
+
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <ImportGroup Label="ExtensionTargets">
+    <Import Project="..\..\..\packages\Microsoft.Windows.CppWinRT.2.0.200609.3\build\native\Microsoft.Windows.CppWinRT.targets" Condition="Exists('..\..\..\packages\Microsoft.Windows.CppWinRT.2.0.200609.3\build\native\Microsoft.Windows.CppWinRT.targets')" />
+  </ImportGroup>
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('..\..\..\packages\Microsoft.Windows.CppWinRT.2.0.200609.3\build\native\Microsoft.Windows.CppWinRT.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\Microsoft.Windows.CppWinRT.2.0.200609.3\build\native\Microsoft.Windows.CppWinRT.props'))" />
+    <Error Condition="!Exists('..\..\..\packages\Microsoft.Windows.CppWinRT.2.0.200609.3\build\native\Microsoft.Windows.CppWinRT.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\Microsoft.Windows.CppWinRT.2.0.200609.3\build\native\Microsoft.Windows.CppWinRT.targets'))" />
+  </Target>
+</Project>

src/tools/ScratchWinRTServer/ScratchWinRTServer.vcxproj.filters

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Source Files">
+      <UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
+      <Extensions>cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
+    </Filter>
+    <Filter Include="Header Files">
+      <UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
+      <Extensions>h;hh;hpp;hxx;hm;inl;inc;xsd</Extensions>
+    </Filter>
+    <Filter Include="Resource Files">
+      <UniqueIdentifier>{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}</UniqueIdentifier>
+      <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms</Extensions>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="pch.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="pch.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="main.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="PropertySheet.props" />
+    <None Include="packages.config" />
+  </ItemGroup>
+  <ItemGroup>
+    <Text Include="readme.txt" />
+  </ItemGroup>
+</Project>

src/tools/ScratchWinRTServer/main.cpp

@@ -0,0 +1,203 @@
+#include "pch.h"
+#include <winrt/ScratchWinRTServer.h>
+#include "ScratchClass.h"
+#include "HostClass.h"
+using namespace winrt;
+using namespace winrt::Windows::Foundation;
+
+struct ScratchStringable : implements<ScratchStringable, IStringable, IClosable, winrt::ScratchWinRTServer::IScratchInterface>
+{
+    hstring ToString()
+    {
+        return L"Hello from server, ScratchStringable";
+    }
+    hstring DoTheThing()
+    {
+        return L"Zhu Li! Do the thing!";
+    }
+    void Close() { printf("Closed ScratchStringable\n"); }
+};
+struct MyStringable : implements<MyStringable, IStringable>
+{
+    hstring ToString()
+    {
+        return L"Hello from server, MyStringable";
+    }
+};
+
+struct MyStringableFactory : implements<MyStringableFactory, IClassFactory>
+{
+    HRESULT __stdcall CreateInstance(IUnknown* outer, GUID const& iid, void** result) noexcept final
+    {
+        *result = nullptr;
+        if (outer)
+        {
+            return CLASS_E_NOAGGREGATION;
+        }
+        printf("Created MyStringable\n");
+        return make<MyStringable>().as(iid, result);
+    }
+
+    HRESULT __stdcall LockServer(BOOL) noexcept final
+    {
+        return S_OK;
+    }
+};
+
+struct ScratchStringableFactory : implements<ScratchStringableFactory, IClassFactory>
+{
+    HRESULT __stdcall CreateInstance(IUnknown* outer, GUID const& iid, void** result) noexcept final
+    {
+        *result = nullptr;
+        if (outer)
+        {
+            return CLASS_E_NOAGGREGATION;
+        }
+        printf("Created ScratchStringable\n");
+        return make<ScratchStringable>().as(iid, result);
+    }
+
+    HRESULT __stdcall LockServer(BOOL) noexcept final
+    {
+        return S_OK;
+    }
+};
+struct ScratchClassFactory : implements<ScratchClassFactory, IClassFactory>
+{
+    HRESULT __stdcall CreateInstance(IUnknown* outer, GUID const& iid, void** result) noexcept final
+    {
+        *result = nullptr;
+        if (outer)
+        {
+            return CLASS_E_NOAGGREGATION;
+        }
+        printf("\x1b[90mSERVER: Created ScratchClass\x1b[m\n");
+        return make<ScratchWinRTServer::implementation::ScratchClass>().as(iid, result);
+    }
+
+    HRESULT __stdcall LockServer(BOOL) noexcept final
+    {
+        return S_OK;
+    }
+};
+
+std::mutex m;
+std::condition_variable cv;
+bool dtored = false;
+winrt::weak_ref<ScratchWinRTServer::implementation::HostClass> g_weak{ nullptr };
+
+struct HostClassFactory : implements<HostClassFactory, IClassFactory>
+{
+    HostClassFactory(winrt::guid g) :
+        _guid{ g } {};
+
+    HRESULT __stdcall CreateInstance(IUnknown* outer, GUID const& iid, void** result) noexcept final
+    {
+        *result = nullptr;
+        if (outer)
+        {
+            return CLASS_E_NOAGGREGATION;
+        }
+
+        if (!g_weak)
+        {
+            auto strong = make_self<ScratchWinRTServer::implementation::HostClass>(_guid);
+
+            g_weak = (*strong).get_weak();
+            return strong.as(iid, result);
+        }
+        else
+        {
+            auto strong = g_weak.get();
+            return strong.as(iid, result);
+        }
+    }
+
+    HRESULT __stdcall LockServer(BOOL) noexcept final
+    {
+        return S_OK;
+    }
+
+private:
+    winrt::guid _guid;
+};
+
+// DAA16D7F-EF66-4FC9-B6F2-3E5B6D924576
+static constexpr GUID MyStringable_clsid{
+    0xdaa16d7f,
+    0xef66,
+    0x4fc9,
+    { 0xb6, 0xf2, 0x3e, 0x5b, 0x6d, 0x92, 0x45, 0x76 }
+};
+
+// EAA16D7F-EF66-4FC9-B6F2-3E5B6D924576
+static constexpr GUID ScratchStringable_clsid{
+    0xeaa16d7f,
+    0xef66,
+    0x4fc9,
+    { 0xb6, 0xf2, 0x3e, 0x5b, 0x6d, 0x92, 0x45, 0x76 }
+};
+// FAA16D7F-EF66-4FC9-B6F2-3E5B6D924576
+static constexpr GUID ScratchClass_clsid{
+    0xfaa16d7f,
+    0xef66,
+    0x4fc9,
+    { 0xb6, 0xf2, 0x3e, 0x5b, 0x6d, 0x92, 0x45, 0x76 }
+};
+
+int main(int argc, char** argv)
+{
+    auto hOut = GetStdHandle(STD_OUTPUT_HANDLE);
+    DWORD dwMode = 0;
+    GetConsoleMode(hOut, &dwMode);
+    dwMode |= ENABLE_VIRTUAL_TERMINAL_PROCESSING;
+    SetConsoleMode(hOut, dwMode);
+
+    printf("\x1b[90mSERVER: args:[");
+    if (argc > 0)
+    {
+        for (int i = 0; i < argc; i++)
+        {
+            printf("%s,", argv[i]);
+        }
+    }
+    printf("]\x1b[m\n");
+
+    winrt::guid guidFromCmdline{};
+
+    if (argc > 1)
+    {
+        std::string guidString{ argv[1] };
+        auto canConvert = guidString.length() == 38 && guidString.front() == '{' && guidString.back() == '}';
+        if (canConvert)
+        {
+            std::wstring wideGuidStr{ til::u8u16(guidString) };
+            printf("\x1b[90mSERVER: Found GUID:%ls\x1b[m\n", wideGuidStr.c_str());
+            GUID result{};
+            THROW_IF_FAILED(IIDFromString(wideGuidStr.c_str(), &result));
+            guidFromCmdline = result;
+        }
+    }
+    if (guidFromCmdline == winrt::guid{})
+    {
+        printf("did not recieve GUID, early returning.");
+        return -1;
+    }
+
+    init_apartment();
+
+    DWORD registrationHostClass{};
+    check_hresult(CoRegisterClassObject(guidFromCmdline,
+                                        make<HostClassFactory>(guidFromCmdline).get(),
+                                        CLSCTX_LOCAL_SERVER,
+                                        REGCLS_MULTIPLEUSE,
+                                        &registrationHostClass));
+    printf("%d\n", registrationHostClass);
+
+    std::unique_lock<std::mutex> lk(m);
+    cv.wait(lk, [] { return dtored; });
+
+    // printf("\x1b[90mSERVER: Press Enter me when you're done serving.\x1b[m");
+    // getchar();
+    printf("\x1b[90mSERVER: exiting %s\n\x1b[m", argv[1]);
+}

src/tools/ScratchWinRTServer/packages.config

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Microsoft.Windows.CppWinRT" version="2.0.200609.3" targetFramework="native" />
+</packages>

src/tools/ScratchWinRTServer/pch.cpp

@@ -0,0 +1 @@
+#include "pch.h"

src/tools/ScratchWinRTServer/pch.h

@@ -0,0 +1,35 @@
+#pragma once
+
+#define WIN32_LEAN_AND_MEAN
+// Manually include til after we include Windows.Foundation to give it winrt superpowers
+#define BLOCK_TIL
+#include <wil/cppwinrt.h>
+#undef max
+#undef min
+#include "LibraryIncludes.h"
+
+#include <Unknwn.h>
+#include <winrt/Windows.Foundation.h>
+#include <winrt/Windows.Foundation.Collections.h>
+
+#include <winrt/Windows.UI.Xaml.Controls.h>
+#include <winrt/Windows.UI.Xaml.Media.h>
+#include <windows.ui.xaml.media.dxinterop.h>
+
+// Manually include til after we include Windows.Foundation to give it winrt superpowers
+#include "til.h"
+
+#include <dxgi.h>
+#include <dxgi1_2.h>
+#include <dxgi1_3.h>
+
+#include <d3d11.h>
+#include <d2d1.h>
+#include <d2d1_1.h>
+#include <d2d1_2.h>
+#include <d2d1_3.h>
+#include <d2d1helper.h>
+#include <dwrite.h>
+#include <dwrite_1.h>
+#include <dwrite_2.h>
+#include <dwrite_3.h>

src/tools/ScratchWinRTServer/readme.txt

@@ -0,0 +1,30 @@
+========================================================================
+    C++/WinRT ScratchWinRTServer Project Overview
+========================================================================
+
+This project demonstrates how to get started consuming Windows Runtime 
+classes directly from standard C++, using platform projection headers
+generated from Windows SDK metadata files.
+
+Steps to generate and consume SDK platform projection:
+1. Build project initally to generate platform projection headers into
+    your Generated Files folder.
+2. Include a projection namespace header in your pch.h, such as 
+    <winrt/Windows.Foundation.h>.
+3. Consume winrt namespace and any Windows Runtime namespaces, such as 
+    winrt::Windows::Foundation, from source code.
+4. Initialize apartment via init_apartment() and consume winrt classes.
+
+Steps to generate and consume a projection from third party metadata:
+1. Add a WinMD reference by right-clicking the References project node
+    and selecting "Add Reference...".  In the Add References dialog, 
+    browse to the component WinMD you want to consume and add it.
+2. Build the project once to generate projection headers for the 
+    referenced WinMD file under the "Generated Files" subfolder.
+3. As above, include projection headers in pch or source code 
+    to consume projected Windows Runtime classes.
+
+========================================================================
+Learn more about C++/WinRT here:
+http://aka.ms/cppwinrt/
+========================================================================