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diff --git a/kon/konrmtile.h b/kon/konrmtile.h
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+/* SPDX-License-Identifier: MIT */
+/*
+ * konrmtile.h
+ *
+ * Copyright (c) 2026 KonAki
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef KONRMTILE_H
+#define KONRMTILE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*** definition ***/
+
+/* where the pieces of one RPG Maker map tile come from in the tileset pictures, with nothing drawn. a tile is one whole piece
+   from a picture, or for an autotile four quarters that fit together with their neighbours. everything is counted in half tiles,
+   so for a picture made of 48 pixel tiles a half tile is 24 pixels. mzmap writes the tileset's picture names in order:
+   sheet 0 is A1, 1 A2, 2 A3, 3 A4, 4 A5, 5 B, 6 C, 7 D and 8 E */
+
+#define KON_RM_SHEETS 9
+
+typedef struct kon_rmQuad {
+	int sheet;
+	int sx, sy; /* where the piece starts in the picture */
+	int dx, dy; /* where it goes inside the tile, 0 or 1 for a quarter */
+	int w, h; /* 2 and 2 for a whole tile, 1 and 1 for a quarter */
+} kon_rmQuad_t;
+
+/* fills quads (room for 4) and returns how many there are: 0 for an empty tile or one that is not drawn, 1 for a whole tile,
+   4 for an autotile. frame is the animation count, water and waterfalls move with it and it is 0 for a still picture */
+int kon_rmTileQuads(int tileId, int frame, kon_rmQuad_t quads[4]);
+
+/* how many half tiles wide and tall a picture of that sheet has to be to hold every piece of it, for checking a loaded picture.
+   returns 0 for a sheet number that does not exist */
+int kon_rmSheetSize(int sheet, int *columns, int *rows);
+
+/* 1 for the tiles that are drawn above the characters: the ones marked with a star, flags is the tile's flags from its tileset */
+int kon_rmTileIsHigher(int flags);
+
+/* 1 for a tile that is an autotile, 1 for one that moves */
+int kon_rmTileIsAutotile(int tileId);
+int kon_rmTileIsAnimated(int tileId);
+
+#ifdef __cplusplus
+}
+#endif
+#endif