bloodstoneMapReader

Reads bloodstone minimap files and exports them as PNG.

Structure

File info

Every minimap file begins with the file coordinates in the world map (4 bytes, being 2 for X and 2 for Y) and the floor (1 byte for Z).

Exemple

The file minimap_270401_7.map begins with the bytes 10 04 20 04 07. The X coordinate is 0x0410, the Y coordinate is 0x0420, and the floor is 07.

Pixels

After the first 5 bytes we begin reading the colors for each pixel, starting from left to right, top to bottom. Each pixel is composed of 3 bytes of information.

(NOT SURE, BUT LOOKS CORRECT) The first byte indicates the type of the tile. The types are 01 (can't walk), 04 (unexplored), 05 (can walk), and 07 (objects that changes player's elevation, and all sorts of stairs, holes, etc.)

The second byte indicates the color of the pixel. The value corresponds to a unique color value stored on a table (colorTable.bin file). There are 251 possible colors.

The meaning of the third byte is unknown at the moment, but it's probably related to some sort of flag for special objects or textures on a tile. Here is a list of known third bytes:

FF

64

78

82

7D

6E

87

8C

B4

C8

96

FE

FA

9D

F5

The color table

I was able to dig out a table of colors from the executable and find a pattern in how they are loaded. Each entry on the table is 24 bytes long, but only a few of the bytes represents the actual color. Here is a snippet:

01 00 00 00 | FF FF 00 00 | 00 00 00 00 | 00 00 00 00 | 90 67 D5 05 | 01 00 00 00 |

Unknown.....| al al re re | gr gr bl bl | Unknown..................................