+==========================================================================================+
|Dangerous Dave graphics format:                                                           |
+==========================================================================================+

This covers the file EGADAV.DAV, the 16 color EGA graphics for Dave to use. The CGA and
VGA graphics are stored in the executable and not covered here yet.

Dave uses EGA type graphics, in which an image is stored as 4 (or 5) 'planes' of data. (4
for unmasked graphics, blue, green, red and intensity, 5 for unmasked graphics, which also
has a 'masked' plane.) Dave has each single graphic divided into four planes, the mask for
sprites being another, seperate, graphic.

In each plane 8 pixels are stored per byte, (this is why graphic sizes tend to be multiples
of 8 pixels wide.) giving in total an approximately 4-bit form of storage.

A pixel (Or rather 8 pixels) is composed by adding all the values from the four planes
for each pixel. So black is 0000, and dark blue is 1000 (Light blue is 1001) etc. 
In summary:

GRAPHICS ->
   4 PLANES ->
      8 PIXEL LINES ->
         0\1 BITS

BGRL: COLOR
0000: Black
0001: Dark grey
0010: Red
0011: Light red
0100: Green
0101: Light green
0110: Brown
0111: Light brown (Yellow)
1000: Dark blue 
1001: Light blue
1010: Purple
1011: Light purple (Pink)
1100: Turqoise
1101: Light Turquoise
1110: Grey
1111: White





+------------------------------------------------------------------------------------------+
|Dave I External EGA Graphics ('EGADAV.DAV'):                                              |
+------------------------------------------------------------------------------------------+

This stores all the external EGA graphics used by dave; tiles, sprites and the header for all images.


-------------------------------------------------------------------------------
EGAHEAD STRUCTURE:
HEADER
IMAGES
...
..
.
-------------------------------------------------------------------------------


-------------------------------------------------------------------------------
HEADER:
0       4    Numpics     Number of images in the file 
4       4x   Picloc      Location, from file start, to picture x data. There are [numpics] of these
?       4x   Picdat      Picture data, one set for each picture. If this is a tile it will be 128
                         bytes in size (16x16 pixels) Otherwise the height and width are stored in
                         the picture data itself

                         If the picture s masked (A sprite) then it is followed by a black and white
                         image used as its mask, Dave has no seperate masking plane.


------------------------------------------------
GRAPHIC ENTRIES:
?       2    Size h      The width of the graphic. Absent if graphic is a tile
+2      2    Size v      The height of the graphic in pixels. Absent if graphic is a tile
+4      x    data        Graphics data; graphic is divided into rows, each h \ 8 bytes long,
                         with the order I,R,G,B giving each graphic a total size of hw \ 2
------------------------------------------------