Handout

kernel/graphics/fonts/font.h

@@ -0,0 +1,73 @@
+/*! \file
+ *  \brief \ref Font "Monospaced fonts"
+ */
+
+#pragma once
+
+#include "../../types.h"
+
+/*! \brief Monospaced fonts
+ * \ingroup gfx
+ *
+ * Console fonts are extracted from the Linux kernel
+ * ([/lib/fonts/](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/lib/fonts)).
+ */
+class Font {
+	/*! \brief Pointer to bitmap font
+	 */
+	const unsigned char* data;
+
+	/*! \brief Size in memory of bitmap font
+	 */
+	const size_t size;
+
+   public:
+	/*! \brief Name of font
+	 */
+	const char* name;
+
+	/*! \brief Width of a character
+	 */
+	const unsigned width;
+
+	/*! \brief Height of a character
+	 */
+	const unsigned height;
+
+	/*! \brief Constructor for a font
+	 *
+	 * \param name Name of font
+	 * \param width character width
+	 * \param height character height
+	 * \param data Pointer to bitmap font
+	 */
+	Font(const char* name, unsigned width, unsigned height,
+		 const unsigned char* data)
+		: data(data),
+		  size((((width + (8 >> 1)) / 8) * height)),
+		  name(name),
+		  width(width),
+		  height(height) {}
+
+	/*! \brief Get bitmap address for a given character
+	 *
+	 *  \param c character (ASCII)
+	 *  \return Pointer to bitmap of character
+	 */
+	const void* symbol(unsigned char c) const { return &data[size * c]; }
+
+	/*! \brief Find font
+	 *
+	 *  \param name Name of font (or `nullptr` for any)
+	 *  \param width Width of a character (or `0` for any)
+	 *  \param height Height of a character (or `0` for any)
+	 *  \return Pointer to font or `nullptr` if no matching font was found
+	 */
+	static Font* get(const char* name = nullptr, unsigned width = 0,
+					 unsigned height = 0);
+
+	/*! \brief Get the number of available fonts
+	 *  \return number of fonts
+	 */
+	static unsigned number();
+};