1 files changed, 13 insertions, 6 deletions

diff --git a/include/isogfx/asset.h b/include/isogfx/asset.h
index 9aeb55d..6050500 100644
--- a/include/isogfx/asset.h
+++ b/include/isogfx/asset.h
@@ -25,8 +25,15 @@ typedef struct Ts_Tile {
   uint32_t pixels; // Byte offset into the Ts_TileSet's 'pixels'.
 } Ts_Tile;
 
+// Tileset.
+//
+// Tile dimensions may be larger than the baseline tile dimensions of the
+// tileset if the tileset contains supertiles. Regardless, tile dimensions are
+// always a multiple of baseline dimensions along each axis.
 typedef struct Ts_TileSet {
   uint16_t num_tiles;
+  uint16_t tile_width;  // Baseline tile width.
+  uint16_t tile_height; // Baseline tile height.
   uint16_t _pad;
   Ts_Tile  tiles[1]; // Count: num_tiles.
   Pixel    pixels[]; // Count: sum_i(tile[i].width * tile[i].height).
@@ -64,8 +71,8 @@ typedef struct Tm_Map {
 ///
 /// Pixels are 8-bit indices into the sprite sheet's colour palette.
 typedef struct Ss_Row {
-  uint16_t num_cols;  /// Number of columns in this row.
-  uint8_t  pixels[1]; /// Count: num_cols * sprite_width * sprite_height.
+  uint16_t num_cols;  // Number of columns in this row.
+  uint8_t  pixels[1]; // Count: num_cols * sprite_width * sprite_height.
 } Ss_Row;
 
 typedef struct Ss_Palette {
@@ -77,11 +84,11 @@ typedef struct Ss_Palette {
 ///
 /// Sprite width and height are assumed constant throughout the sprite sheet.
 typedef struct Ss_SpriteSheet {
-  uint16_t   sprite_width;  /// Sprite width in pixels.
-  uint16_t   sprite_height; /// Sprite height in pixels.
+  uint16_t   sprite_width;  // Sprite width in pixels.
+  uint16_t   sprite_height; // Sprite height in pixels.
   uint16_t   num_rows;
-  Ss_Palette palette; /// Variable size.
-  Ss_Row     rows[1]; /// Count: num_rows. Variable offset.
+  Ss_Palette palette; // Variable size.
+  Ss_Row     rows[1]; // Count: num_rows. Variable offset.
 } Ss_SpriteSheet;
 
 // -----------------------------------------------------------------------------