Split XCUI hosted preview ImGui presenter seam

new_editor/src/XCUIBackend/ImGuiXCUIHostedPreviewPresenter.h

@@ -0,0 +1,45 @@
+#pragma once
+
+#include "XCUIBackend/ImGuiTransitionBackend.h"
+#include "XCUIBackend/XCUIHostedPreviewPresenter.h"
+
+#include <memory>
+
+namespace XCEngine {
+namespace Editor {
+namespace XCUIBackend {
+
+class ImGuiXCUIHostedPreviewPresenter final : public IXCUIHostedPreviewPresenter {
+public:
+    bool Present(const XCUIHostedPreviewFrame& frame) override {
+        m_lastStats = {};
+        if (frame.drawData == nullptr) {
+            return false;
+        }
+
+        m_backend.BeginFrame();
+        m_backend.Submit(*frame.drawData);
+        m_lastStats.submittedDrawListCount = m_backend.GetPendingDrawListCount();
+        m_lastStats.submittedCommandCount = m_backend.GetPendingCommandCount();
+        m_lastStats.presented = m_backend.EndFrame(frame.targetDrawList);
+        m_lastStats.flushedDrawListCount = m_backend.GetLastFlushedDrawListCount();
+        m_lastStats.flushedCommandCount = m_backend.GetLastFlushedCommandCount();
+        return m_lastStats.presented;
+    }
+
+    const XCUIHostedPreviewStats& GetLastStats() const override {
+        return m_lastStats;
+    }
+
+private:
+    ImGuiTransitionBackend m_backend = {};
+    XCUIHostedPreviewStats m_lastStats = {};
+};
+
+inline std::unique_ptr<IXCUIHostedPreviewPresenter> CreateImGuiXCUIHostedPreviewPresenter() {
+    return std::make_unique<ImGuiXCUIHostedPreviewPresenter>();
+}
+
+} // namespace XCUIBackend
+} // namespace Editor
+} // namespace XCEngine