CFAST Disney Animation Studio

From Just Solve the File Format Problem
Revision as of 02:47, 18 June 2017 by Sigurdler (Talk | contribs)

Jump to: navigation, search
File Format
Name CFAST Disney Animation Studio
Ontology
Extension(s) .cft

CFAST is an animated raster graphics format associated with the Disney Animation Studio application for Amiga computers.

Contents

Format Specification

4 bytes - signature 'GUCF', 'LOCK' or 'STDY'

If the signature is 'LOCK' or 'STDY' then a copyright/description message follows
2 bytes string length
n bytes string
'LOCK' means the file was meant to be saved as final/non editable

Then follows the bitmap header
4 bytes - image width
4 bytes - image height
4 bytes - Amiga screen width (320=lores, 640=hires)
4 bytes - Amiga screen height (200/400, 256/512)
1 byte - number of bitplanes (1..5) (numColors = 2^bitplanes)

Then follows palette information for the first two colors (if there are more colors, they are specified later in the file)
3 bytes - rgb for color index 0
3 bytes - rgb for color index 1

Then follows an extra block of data of varying length
1 byte - extralen
n bytes (unknown contents)

Then follows the number of frames
4 bytes - numFrames

for every frame
   for every bitplane
      4 bytes - compressed size of bitplane
      n bytes - compressed bitplane data
   end of every bitplane

   1 byte - numColors in frame
   3*numColors bytes

   1 byte - number of color cycling ranges
   for every range
	1 byte - low color index (0..31)
	1 byte - high color index (0..31)
	6 bytes - unknown
	4 bytes - color cycle Rate
        32 bytes - color cycle color indices ? Seems to always be numbered 0,1,2,3,4...31 (regardless of # bitplanes)
	  I don't know why need these, when we have low/high,
   end of every range
end of every frame

At the end of file may be exposure sheet information ... (TODO)

Bitplanes are compressed with run length encoding. Each <i>column</i> of <i>words (two bytes)</i> are compressed separately.

2 bytes - code
if code < 0 then the next word is replicated -code+1 times
else code+1 words are copied literally

Software

Sample files

Links

Personal tools
Namespaces

Variants
Actions
Navigation
Toolbox