Kernel: Move font code to its own library LibFont

LibFont/include/LibFont/Font.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <BAN/ByteSpan.h>
+#include <BAN/HashMap.h>
+#include <BAN/StringView.h>
+
+namespace LibFont
+{
+
+	class Font
+	{
+	public:
+		static BAN::ErrorOr<Font> load(BAN::StringView path);
+#if __is_kernel
+		static BAN::ErrorOr<Font> prefs();
+#endif
+
+		uint32_t width() const { return m_width; }
+		uint32_t height() const { return m_height; }
+		uint32_t pitch() const { return m_pitch; }
+
+		bool has_glyph(uint32_t) const;
+		const uint8_t* glyph(uint32_t) const;
+
+	private:
+		static BAN::ErrorOr<Font> parse_psf1(BAN::ConstByteSpan);
+		static BAN::ErrorOr<Font> parse_psf2(BAN::ConstByteSpan);
+
+	private:
+		BAN::HashMap<uint32_t, uint32_t> m_glyph_offsets;
+		BAN::Vector<uint8_t> m_glyph_data;
+		uint32_t m_width = 0;
+		uint32_t m_height = 0;
+		uint32_t m_pitch = 0;
+	};
+
+}