atlas factory Windows implementation

openVulkanoCpp/Scene/Text/FontAtlasFactory.hpp

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+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+#pragma once
+
+#include "FontAtlas.hpp"
+#include "Scene/SubpixelLayout.hpp"
+
+namespace OpenVulkano::Scene
+{
+	class FontAtlasFactory final
+	{
+		struct FontIdentifier
+		{
+			FontIdentifier(const std::string& font_, const std::set<uint32_t>& charset, SubpixelLayout subpixelLayout_,
+			               float ptSize_, bool msdf_)
+			    : font(font_), subpixelLayout(subpixelLayout_), ptSize(ptSize_), msdf(msdf_)
+			{
+				std::for_each(charset.begin(), charset.end(), [&](uint32_t c) { charsetHash ^= c; });
+			}
+
+			std::string font;
+			size_t charsetHash = 0;
+			SubpixelLayout subpixelLayout = SubpixelLayout::UNKNOWN;
+			float ptSize = 0;
+			bool msdf = true;
+
+			bool operator<(const FontIdentifier& other) const
+			{
+				if (font != other.font)
+				{
+					return font < other.font;
+				}
+				if (charsetHash != other.charsetHash)
+				{
+					return charsetHash < other.charsetHash;
+				}
+				if (subpixelLayout != other.subpixelLayout)
+				{
+					return subpixelLayout < other.subpixelLayout;
+				}
+				if (ptSize != other.ptSize)
+				{
+					return ptSize < other.ptSize;
+				}
+				return msdf < other.msdf;
+			}
+
+		};
+	public:
+		FontAtlasFactory(bool allowSystemFonts = true) : m_allowSystemFonts(allowSystemFonts) {}
+		[[nodiscard]] FontAtlas::Ptr GetFontAtlasScalable(const std::string& fontIdentifier,
+		                                                  const std::set<uint32_t>& charset = {},
+		                                                  bool msdf = true) const;
+		[[nodiscard]] FontAtlas::Ptr GetFontAtlas(const std::string& fontIdentifier, float ptSize,
+		                                          const std::set<uint32_t>& charset = {},
+		                                          std::optional<SubpixelLayout> subpixelLayout = std::nullopt) const;
+
+	private:
+		std::string FindFont(const std::string& fontFile) const;
+
+	private:
+		bool m_allowSystemFonts;
+		mutable std::map<FontIdentifier, FontAtlas::Ptr> m_atlasesCache;
+	};
+}