Contain retained base UI controls

CMakeLists.txt

@@ -308,12 +308,49 @@ if(PP_BUILD_APP)
             VS_GLOBAL_CharacterSet "Unicode")
 
         target_precompile_headers(pp_legacy_engine PRIVATE src/pch.h)
+
+        add_library(pp_legacy_ui_core OBJECT
+            ${PP_LEGACY_UI_CORE_SOURCES})
+
+        target_link_libraries(pp_legacy_ui_core
+            PUBLIC
+                pp_legacy_engine
+                pp_project_options
+            PRIVATE
+                pp_renderer_api
+                pp_project_warnings)
+        if(TARGET pp_renderer_gl)
+            target_link_libraries(pp_legacy_ui_core PRIVATE pp_renderer_gl)
+        endif()
+
+        target_include_directories(pp_legacy_ui_core
+            PUBLIC
+                ${PP_LEGACY_INCLUDE_DIRS})
+
+        target_compile_definitions(pp_legacy_ui_core
+            PUBLIC
+                ENUM_BITFIELDS_NOT_SUPPORTED
+                UNICODE
+                _UNICODE
+                _CRT_SECURE_NO_WARNINGS
+                _SCL_SECURE_NO_WARNINGS
+                _SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING
+                _SILENCE_STDEXT_ARR_ITERS_DEPRECATION_WARNING
+                _CONSOLE
+                WITH_CURL=1)
+        set_target_properties(pp_legacy_ui_core PROPERTIES
+            VS_GLOBAL_CharacterSet "Unicode")
+
+        target_precompile_headers(pp_legacy_ui_core PRIVATE src/pch.h)
+
         add_library(pp_legacy_app STATIC
-            ${PP_LEGACY_APP_SOURCES})
+            ${PP_LEGACY_APP_SOURCES}
+            $<TARGET_OBJECTS:pp_legacy_ui_core>)
 
         target_link_libraries(pp_legacy_app
             PUBLIC
                 pp_legacy_engine
+                pp_legacy_ui_core
                 pp_project_options
             PRIVATE
                 pp_renderer_api

cmake/PanoPainterSources.cmake

@@ -27,8 +27,7 @@ set(PP_LEGACY_RENDERER_GL_SOURCES
     src/texture.cpp
 )
 
-set(PP_LEGACY_APP_SOURCES
+set(PP_LEGACY_UI_CORE_SOURCES
-    src/canvas_modes.cpp
     src/layout.cpp
     src/node.cpp
     src/node_border.cpp
@@ -49,6 +48,10 @@ set(PP_LEGACY_APP_SOURCES
     src/node_slider.cpp
     src/node_text.cpp
     src/node_text_input.cpp
+)
+
+set(PP_LEGACY_APP_SOURCES
+    src/canvas_modes.cpp
     src/pch.cpp
 )
 

docs/modernization/build-inventory.md

@@ -10,7 +10,7 @@ Keep it updated as platform paths move to shared CMake targets.
 
 | Platform/Target | Current Entrypoint | Notes |
 | --- | --- | --- |
-| Windows desktop | Root `CMakeLists.txt`, preset `windows-msvc-default`; target preset `windows-vs2026-x64` retained for VS 2026 | Raw `.sln/.vcxproj` files removed on 2026-05-31; local machine currently uses Visual Studio 17 2022; `PanoPainter` now links through `pp_platform_windows` and `panopainter_app`, with Windows/vendor link dependencies owned by the platform shell, runtime payload deployment in `cmake/PanoPainterRuntime.cmake`, retained third-party source dependencies contained by `pp_legacy_vendor`, retained OpenGL runtime sources contained by `pp_legacy_renderer_gl` and folded into `pp_legacy_engine`, legacy canvas/asset/runtime sources contained by `pp_legacy_engine`, app orchestration/version metadata owned by `panopainter_app`, and app-specific modal/dialog/panel/canvas workflow nodes owned by `pp_panopainter_ui` |
+| Windows desktop | Root `CMakeLists.txt`, preset `windows-msvc-default`; target preset `windows-vs2026-x64` retained for VS 2026 | Raw `.sln/.vcxproj` files removed on 2026-05-31; local machine currently uses Visual Studio 17 2022; `PanoPainter` now links through `pp_platform_windows` and `panopainter_app`, with Windows/vendor link dependencies owned by the platform shell, runtime payload deployment in `cmake/PanoPainterRuntime.cmake`, retained third-party source dependencies contained by `pp_legacy_vendor`, retained OpenGL runtime sources contained by `pp_legacy_renderer_gl` and folded into `pp_legacy_engine`, legacy canvas/asset/runtime sources contained by `pp_legacy_engine`, retained base UI controls contained by `pp_legacy_ui_core` and folded into `pp_legacy_app`, app orchestration/version metadata owned by `panopainter_app`, and app-specific modal/dialog/panel/canvas workflow nodes owned by `pp_panopainter_ui` |
 | Windows AppX | `PanoPainterPackage/Package.appxmanifest`, `.wapproj` referenced by solution | Distribution packaging |
 | macOS | `PanoPainter-OSX/` project files and `Info.plist` | Uses `NSOpenGLView` today |
 | iOS | `PanoPainter/Info.plist`, related Apple sources | Uses OpenGL ES today |
@@ -410,6 +410,10 @@ Known warnings after the current CMake app build:
   the retained OpenGL runtime classes still include legacy app/engine headers
   and are still consumed directly by canvas and UI classes. It should become a
   normal backend library once those call sites depend on `pp_renderer_api`.
+- `pp_legacy_ui_core` is an object-library containment boundary because the
+  retained base `Node` controls still depend on legacy renderer and app
+  headers. It should shrink as layout parsing, colors, generic controls, and
+  text/image primitives move to `pp_ui_core`.
 - `pp_panopainter_ui` currently surfaces existing legacy `Node`/`Serializer`
   header and static-analysis warnings while it still depends on
   `pp_legacy_app`; these should be reduced as the UI core/app UI boundary is

docs/modernization/roadmap.md

@@ -156,7 +156,11 @@ replacement components take over.
 `pp_legacy_renderer_gl` now owns the retained OpenGL runtime implementations
 for `Font`, `RTT`, `Shader`, `Shape`, `Texture2D`, `TextureCube`, `Sampler`,
 and `TextureManager` as an object-library boundary folded into the retained
-engine until the renderer API inversion is complete.
+engine until the renderer API inversion is complete. `pp_legacy_ui_core` now
+owns retained base `Node`, layout, text, image, input, popup, slider, scroll,
+and settings UI controls as an object-library boundary folded into the legacy
+app adapter until those paths are replaced by `pp_ui_core` and app-specific UI
+targets.
 `panopainter_app` is now a real static target that owns app orchestration
 sources, app version metadata, and version-header generation.
 `pp_panopainter_ui` now owns app-specific modal, dialog, panel, canvas,