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Source/Engine/Render2D/FontManager.h

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+// Copyright (c) 2012-2020 Wojciech Figat. All rights reserved.
+
+#pragma once
+
+#include "Engine/Core/Types/BaseTypes.h"
+
+class Font;
+class FontAsset;
+class FontTextureAtlas;
+struct FontCharacterEntry;
+typedef struct FT_LibraryRec_* FT_Library;
+
+/// <summary>
+/// Fonts management and character atlases management utility service.
+/// </summary>
+class FLAXENGINE_API FontManager
+{
+public:
+
+    /// <summary>
+    /// The global characters font scale factor. Used to upscale characters on high-DPI monitors.
+    /// </summary>
+    static float FontScale;
+
+    /// <summary>
+    /// Gets the FreeType library.
+    /// </summary>
+    /// <returns>The library.</returns>
+    static FT_Library GetLibrary();
+
+    /// <summary>
+    /// Gets the texture atlas.
+    /// </summary>
+    /// <param name="index">The atlas index.</param>
+    /// <returns>The texture atlas.</returns>
+    static FontTextureAtlas* GetAtlas(int32 index);
+
+    /// <summary>
+    /// Adds character from given font to the cache.
+    /// </summary>
+    /// <param name="font">The font to create character entry for it.</param>
+    /// <param name="c">The character to add.</param>
+    /// <param name="entry">The created character entry.</param>
+    /// <returns>True if cannot add new character entry to the font cache, otherwise false.</returns>
+    static bool AddNewEntry(Font* font, Char c, FontCharacterEntry& entry);
+
+    /// <summary>
+    /// Invalidates the cached dynamic font character. Can be used to reload font characters after changing font asset options.
+    /// </summary>
+    /// <param name="entry">The font character entry.</param>
+    static void Invalidate(FontCharacterEntry& entry);
+
+    /// <summary>
+    /// Flushes all font atlases.
+    /// </summary>
+    static void Flush();
+
+    // Ensure that atlas with given index has been created
+    static void EnsureAtlasCreated(int32 index);
+
+    /// <summary>
+    /// Determines whether one or more font atlases is dirty.
+    /// </summary>
+    /// <returns><c>true</c> if one or more font atlases is dirty; otherwise, <c>false</c>.</returns>
+    static bool IsDirty();
+
+    /// <summary>
+    /// Determines whether all atlases has been synced with the GPU memory and data is up to date.
+    /// </summary>
+    /// <returns><c>true</c> if all atlases has been synced with the GPU memory and data is up to date; otherwise, <c>false</c>.</returns>
+    static bool HasDataSyncWithGPU();
+};