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Source/Engine/Content/Upgraders/FontAssetUpgrader.h

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+// Copyright (c) 2012-2020 Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#include "BinaryAssetUpgrader.h"
+#include "Engine/Render2D/FontAsset.h"
+
+/// <summary>
+/// Font Asset Upgrader
+/// </summary>
+/// <seealso cref="BinaryAssetUpgrader" />
+class FontAssetUpgrader : public BinaryAssetUpgrader
+{
+public:
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="FontAssetUpgrader"/> class.
+    /// </summary>
+    FontAssetUpgrader()
+    {
+        static const Upgrader upgraders[] =
+        {
+            { 1, 2, &Upgrade_1_To_2 },
+            { 2, 3, &Upgrade_2_To_3 },
+        };
+        setup(upgraders, ARRAY_COUNT(upgraders));
+    }
+
+private:
+
+    // ============================================
+    //                  Version 1:
+    // Designed: long time ago in a galaxy far far away
+    // Custom Data: not used
+    // Chunk 0: Header
+    // Chunk 1: Font File data
+    // ============================================
+    //                  Version 2:
+    // Designed: 4/20/2017
+    // Custom Data: not used
+    // Chunk 0: Font File data
+    // ============================================
+    //                  Version 3:
+    // Designed: 10/24/2019
+    // Custom Data: Header1
+    // Chunk 0: Font File data
+    // ============================================
+
+    typedef FontOptions Header1;
+
+    static bool Upgrade_1_To_2(AssetMigrationContext& context)
+    {
+        ASSERT(context.Input.SerializedVersion == 1 && context.Output.SerializedVersion == 2);
+
+        if (context.AllocateChunk(0))
+            return true;
+        context.Output.Header.Chunks[0]->Data.Copy(context.Input.Header.Chunks[1]->Data);
+
+        return false;
+    }
+
+    static bool Upgrade_2_To_3(AssetMigrationContext& context)
+    {
+        ASSERT(context.Input.SerializedVersion == 2 && context.Output.SerializedVersion == 3);
+
+        Header1 header;
+        header.Hinting = FontHinting::Default;
+        header.Flags = FontFlags::AntiAliasing;
+        context.Output.CustomData.Copy(&header);
+
+        return CopyChunk(context, 0);
+    }
+};