add simple work with fonts (too small for this screen), still have some bugs with sprites in lower right corner

F3:F303/NitrogenFlooding/fonts.h

@@ -0,0 +1,42 @@
+/*
+ * This file is part of the nitrogen project.
+ * Copyright 2023 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+// type for font choosing
+typedef enum{
+    FONT_T_MIN = -1,    // no fonts <= this
+    FONT14,             // 16x16, font height near 14px
+    FONTN8,             // numbers and 'A'..'Z', height 8px
+    FONT_T_MAX          // no fonts >= this
+} font_t;
+
+int choose_font(font_t newfont);
+const uint8_t *font_char(uint8_t Char);
+
+typedef struct{
+    const uint8_t *font;        // font inself
+    const uint8_t *enctable;    // font encoding table
+    uint8_t height;             // full font matrix height
+    uint8_t bytes;              // amount of bytes in font matrix
+    uint8_t baseline;           // baseline position (coordinate from bottom line)
+} afont;
+
+extern const afont *curfont;