build: Add support building with msvc

[lygstate]

        "-DCMAKE_PREFIX_PATH=C:/work/vcpkg/packages/zlib_x64-windows;C:/work/vcpkg/packages/curl_x64-windows;C:/work/vcpkg/packages/libffi_x64-windows;C:/work/vcpkg/packages/sdl2_x64-windows",
        "-DBUILD_LVGL_SIMULATOR=ON",
        "-DUSE_EXTERNAL_FFI=ON",
        "-DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreaded$<$<CONFIG:Debug>:Debug>"

vcpkg install:

.\vcpkg.exe install curl zlib libffi sdl2 libffi:x64-windows-static

---

Summary by cubic

Add MSVC build support and a simulator screenshot API, upgrade txiki to v26.5.0, and expose LVGL constants to JS for more reliable cross‑platform builds.

• New Features

  • MSVC support: C++23 on MSVC (C++14 elsewhere), /utf-8, WIN32_LEAN_AND_MEAN, Arc name clash resolved; new BUILD_LVGL_SIMULATOR=ON for simulator builds.
  • Simulator PNG capture: NativeRender.RenderUtil.captureDisplay(path) saves the current screen (simulator only); hides cursor/FPS during capture; added GUI test harness and CI that builds and runs tests on Linux/macOS/Windows.
  • LVGL constants in JS: NativeRender.lv_conf exposes compiled LVGL enums (parts/states, align, flex/grid, widget modes); UI now uses these (e.g., STYLE_TYPE.PART_MAIN, LVGL widget enums for Arc/Chart/Keyboard).
  • Headers/config: add deps/lvgl.h umbrella and split LVGL config into lv_conf_sim.h and lv_conf_device.h.

• Bug Fixes

  • Harden QuickJS bindings: correct argc guards and declare real arities to avoid argv OOB reads; adapt to single‑arg JS_IsArray.
  • MSVC compatibility: explicit enum casts and separate lv_obj_add_flag calls fix build/runtime issues; remove zero‑length function tables.
  • Style/runtime fixes: correct style value types and animation duration order; initialize is_new; return JS_UNDEFINED from stopPropagation; pass ArrayBuffer for image/GIF data; resolve local asset paths with import.meta.dirname.

• Dependencies

  • Bump txiki to v26.5.0 and @txikijs/types to ^26.5.0.

• Migration

  • Install with vcpkg: .\vcpkg.exe install curl zlib libffi sdl2 libffi:x64-windows-static
  • Example CMake: -DBUILD_LVGL_SIMULATOR=ON -DUSE_EXTERNAL_FFI=ON -DCMAKE_PREFIX_PATH=C:/work/vcpkg/packages/zlib_x64-windows;C:/work/vcpkg/packages/curl_x64-windows;C:/work/vcpkg/packages/libffi_x64-windows;C:/work/vcpkg/packages/sdl2_x64-windows -DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreaded$<$<CONFIG:Debug>:Debug>

^{Written for commit ee1314b. Summary will update on new commits.}

Closes: #57

[cubic-dev-ai]

5 issues found across 45 files

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="src/engine/hal/simulator/simulator.cpp">

<violation number="1" location="src/engine/hal/simulator/simulator.cpp:3">
P1: Wrapping `LV_IMG_DECLARE(mouse_cursor_icon)` in `extern "C"` creates a C-linkage reference, but `mouse_cursor_icon.c` is compiled with the C++ compiler in this build, so the definition will not match and linking can fail.</violation>
</file>

_{Reply with feedback, questions, or to request a fix. Tag @cubic-dev-ai to re-run a review.}

[cubic-dev-ai]

P1: Wrapping LV_IMG_DECLARE(mouse_cursor_icon) in extern "C" creates a C-linkage reference, but mouse_cursor_icon.c is compiled with the C++ compiler in this build, so the definition will not match and linking can fail.

Prompt for AI agents

Check if this issue is valid — if so, understand the root cause and fix it. At src/engine/hal/simulator/simulator.cpp, line 3:

<comment>Wrapping `LV_IMG_DECLARE(mouse_cursor_icon)` in `extern "C"` creates a C-linkage reference, but `mouse_cursor_icon.c` is compiled with the C++ compiler in this build, so the definition will not match and linking can fail.</comment>

<file context>
@@ -1,5 +1,11 @@
 #include "./simulator.hpp"
 
+extern "C" {
+
+LV_IMG_DECLARE(mouse_cursor_icon); /*Declare the image file.*/
</file context>

Suggested change

	extern "C" {
	LV_IMG_DECLARE(mouse_cursor_icon); /*Declare the image file.*/
	}
	LV_IMG_DECLARE(mouse_cursor_icon); /*Declare the image file.*/

[lygstate]

You were wrong about mouse_cursor_icon.c, the compiler for mouse_cursor_icon.c is default to c, that's why I use
extern "C"

[lygstate]

I create a fork https://github.com/lvgljs/lvgljs to get this merged