Add XCUI new editor sandbox phase 1

new_editor/src/XCUIBackend/XCUIEditorFontSetup.cpp

@@ -0,0 +1,60 @@
+#include "XCUIBackend/XCUIEditorFontSetup.h"
+
+#include <imgui.h>
+
+namespace XCEngine {
+namespace Editor {
+namespace XCUIBackend {
+
+namespace {
+
+constexpr float kUiFontSize = 18.0f;
+constexpr const char* kPrimaryUiFontPath = "C:/Windows/Fonts/segoeui.ttf";
+constexpr const char* kChineseFallbackFontPath = "C:/Windows/Fonts/msyh.ttc";
+
+} // namespace
+
+bool BuildDefaultXCUIEditorFontAtlas(::ImFontAtlas& atlas, ::ImFont*& outDefaultFont) {
+    outDefaultFont = nullptr;
+    atlas.Clear();
+
+    ImFontConfig baseConfig = {};
+    baseConfig.OversampleH = 2;
+    baseConfig.OversampleV = 1;
+    baseConfig.PixelSnapH = true;
+
+    outDefaultFont = atlas.AddFontFromFileTTF(
+        kPrimaryUiFontPath,
+        kUiFontSize,
+        &baseConfig,
+        atlas.GetGlyphRangesDefault());
+
+    if (outDefaultFont != nullptr) {
+        ImFontConfig mergeConfig = baseConfig;
+        mergeConfig.MergeMode = true;
+        mergeConfig.PixelSnapH = true;
+        atlas.AddFontFromFileTTF(
+            kChineseFallbackFontPath,
+            kUiFontSize,
+            &mergeConfig,
+            atlas.GetGlyphRangesChineseSimplifiedCommon());
+    } else {
+        outDefaultFont = atlas.AddFontFromFileTTF(
+            kChineseFallbackFontPath,
+            kUiFontSize,
+            &baseConfig,
+            atlas.GetGlyphRangesChineseSimplifiedCommon());
+    }
+
+    if (outDefaultFont == nullptr) {
+        ImFontConfig fallbackConfig = baseConfig;
+        fallbackConfig.SizePixels = kUiFontSize;
+        outDefaultFont = atlas.AddFontDefault(&fallbackConfig);
+    }
+
+    return outDefaultFont != nullptr;
+}
+
+} // namespace XCUIBackend
+} // namespace Editor
+} // namespace XCEngine