Refactor new editor host orchestration

new_editor/app/Host/HostRuntimeState.h

@@ -0,0 +1,89 @@
+#pragma once
+
+#include <windows.h>
+
+namespace XCEngine::UI::Editor::Host {
+
+class HostRuntimeState {
+public:
+    void Reset() {
+        m_windowDpi = 96u;
+        m_inInteractiveResize = false;
+        m_renderFrameQueued = false;
+        m_hasPendingWindowResize = false;
+        m_pendingWindowResizeWidth = 0u;
+        m_pendingWindowResizeHeight = 0u;
+    }
+
+    void SetWindowDpi(UINT dpi) {
+        m_windowDpi = dpi == 0u ? 96u : dpi;
+    }
+
+    UINT GetWindowDpi() const {
+        return m_windowDpi;
+    }
+
+    float GetDpiScale(float baseDpiScale) const {
+        return baseDpiScale > 0.0f
+            ? static_cast<float>(m_windowDpi) / baseDpiScale
+            : 1.0f;
+    }
+
+    void BeginInteractiveResize() {
+        m_inInteractiveResize = true;
+    }
+
+    void EndInteractiveResize() {
+        m_inInteractiveResize = false;
+    }
+
+    bool IsInteractiveResize() const {
+        return m_inInteractiveResize;
+    }
+
+    void QueueWindowResize(UINT width, UINT height) {
+        if (width == 0u || height == 0u) {
+            return;
+        }
+
+        m_pendingWindowResizeWidth = width;
+        m_pendingWindowResizeHeight = height;
+        m_hasPendingWindowResize = true;
+    }
+
+    bool ConsumePendingWindowResize(UINT& outWidth, UINT& outHeight) {
+        outWidth = 0u;
+        outHeight = 0u;
+        if (!m_hasPendingWindowResize) {
+            return false;
+        }
+
+        m_hasPendingWindowResize = false;
+        outWidth = m_pendingWindowResizeWidth;
+        outHeight = m_pendingWindowResizeHeight;
+        return outWidth > 0u && outHeight > 0u;
+    }
+
+    bool TryQueueDeferredRender() {
+        if (m_renderFrameQueued) {
+            return false;
+        }
+
+        m_renderFrameQueued = true;
+        return true;
+    }
+
+    void ClearDeferredRenderRequest() {
+        m_renderFrameQueued = false;
+    }
+
+private:
+    UINT m_windowDpi = 96u;
+    bool m_inInteractiveResize = false;
+    bool m_renderFrameQueued = false;
+    bool m_hasPendingWindowResize = false;
+    UINT m_pendingWindowResizeWidth = 0u;
+    UINT m_pendingWindowResizeHeight = 0u;
+};
+
+} // namespace XCEngine::UI::Editor::Host