Hide ImGui compat factories behind legacy XCUI interop

tests/NewEditor/test_imgui_window_ui_compositor.cpp

@@ -1,5 +1,6 @@
 #include <gtest/gtest.h>
 
+#include "Platform/D3D12WindowRenderer.h"
 #include "XCUIBackend/IEditorHostCompositor.h"
 #include "XCUIBackend/ImGuiWindowUICompositor.h"
 #include "XCUIBackend/UITextureRegistration.h"

tests/NewEditor/test_legacy_imgui_host_interop.cpp

@@ -0,0 +1,78 @@
+#include <gtest/gtest.h>
+
+#include "XCUIBackend/LegacyImGuiHostInterop.h"
+
+#include <imgui.h>
+
+namespace {
+
+using XCEngine::Editor::XCUIBackend::ApplyLegacyImGuiHostInputCapture;
+using XCEngine::Editor::XCUIBackend::ConfigureLegacyImGuiHostFonts;
+using XCEngine::Editor::XCUIBackend::CreateLegacyImGuiHostedPreviewPresenter;
+using XCEngine::Editor::XCUIBackend::CreateLegacyImGuiPanelCanvasHost;
+using XCEngine::Editor::XCUIBackend::CreateLegacyImGuiWindowUICompositor;
+using XCEngine::Editor::XCUIBackend::RenderLegacyImGuiDemoWindow;
+using XCEngine::Editor::XCUIBackend::XCUIPanelCanvasHostBackend;
+using XCEngine::Editor::XCUIBackend::XCUIInputBridgeFrameSnapshot;
+
+class ScopedImGuiContext final {
+public:
+    ScopedImGuiContext() {
+        IMGUI_CHECKVERSION();
+        ImGui::CreateContext();
+    }
+
+    ~ScopedImGuiContext() {
+        ImGui::DestroyContext();
+    }
+
+    ScopedImGuiContext(const ScopedImGuiContext&) = delete;
+    ScopedImGuiContext& operator=(const ScopedImGuiContext&) = delete;
+};
+
+TEST(LegacyImGuiHostInteropTest, CreatesLegacyHostAdaptersWithImGuiBackends) {
+    auto compositor = CreateLegacyImGuiWindowUICompositor();
+    auto presenter = CreateLegacyImGuiHostedPreviewPresenter();
+    auto canvasHost = CreateLegacyImGuiPanelCanvasHost();
+
+    ASSERT_NE(compositor, nullptr);
+    ASSERT_NE(presenter, nullptr);
+    ASSERT_NE(canvasHost, nullptr);
+    EXPECT_EQ(canvasHost->GetBackend(), XCUIPanelCanvasHostBackend::ImGui);
+
+    const auto capabilities = canvasHost->GetCapabilities();
+    EXPECT_TRUE(capabilities.supportsPointerHitTesting);
+    EXPECT_TRUE(capabilities.supportsHostedSurfaceImages);
+    EXPECT_TRUE(capabilities.supportsPrimitiveOverlays);
+}
+
+TEST(LegacyImGuiHostInteropTest, ApplyInputCaptureCopiesImGuiIoFlagsIntoSnapshot) {
+    ScopedImGuiContext context = {};
+    ImGuiIO& io = ImGui::GetIO();
+    io.WantCaptureKeyboard = true;
+    io.WantTextInput = true;
+
+    XCUIInputBridgeFrameSnapshot snapshot = {};
+    ApplyLegacyImGuiHostInputCapture(snapshot);
+
+    EXPECT_TRUE(snapshot.wantCaptureKeyboard);
+    EXPECT_TRUE(snapshot.wantTextInput);
+}
+
+TEST(LegacyImGuiHostInteropTest, ConfigureFontsPopulatesDefaultFont) {
+    ScopedImGuiContext context = {};
+
+    ASSERT_TRUE(ConfigureLegacyImGuiHostFonts());
+    EXPECT_NE(ImGui::GetIO().FontDefault, nullptr);
+    EXPECT_GT(ImGui::GetIO().Fonts->Fonts.Size, 0);
+}
+
+TEST(LegacyImGuiHostInteropTest, RenderDemoWindowSkipsWorkWhenVisibilityIsDisabled) {
+    ScopedImGuiContext context = {};
+    bool visible = false;
+
+    EXPECT_FALSE(RenderLegacyImGuiDemoWindow(visible));
+    EXPECT_FALSE(visible);
+}
+
+} // namespace