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Reword notes about compressed data in .aseprite specs (fix #3897)

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David Capello 2023-06-01 11:38:03 -03:00
parent 2f54bcaf37
commit 5c41d96db3
1 changed files with 15 additions and 2 deletions
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docs/ase-file-specs.md
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@ -227,7 +227,7 @@ This chunk determine where to put a cel in the specified layer/frame.
+ For cel type = 2 (Compressed Image)
WORD Width in pixels
WORD Height in pixels
BYTE[] "Raw Cel" data compressed with ZLIB method (see NOTE.3)
PIXEL[] "Raw Cel" data compressed with ZLIB method (see NOTE.3)
+ For cel type = 3 (Compressed Tilemap)
WORD Width in number of tiles
WORD Height in number of tiles
@ -541,7 +541,20 @@ first, then the `Layer1` layer chunk, etc.
### NOTE.3
Details about the ZLIB and DEFLATE compression methods:
**Uncompressed Image**: Uncompressed ("raw") images inside `.aseprite`
files are saved row by row from top to bottom, and for each
row/scanline, pixels are from left to right. Each pixel is a `PIXEL`
(or a `TILE` in the case of tilemaps) as defined in the
[References](#references) section (so the number and order of bytes
depends on the color mode of the image/sprite, or the tile
format). Generally you'll not find uncompressed images in `.aseprite`
files (only in very old `.aseprite` files).
**Compressed Image**: When an image is compressed (the regular case
that you will find in `.aseprite` files), the data is a stream of
bytes in exactly the same *"Uncompressed Image"* format as described
above, but compressed using the ZLIB method. Details about the ZLIB
and DEFLATE compression methods can be found here:
* https://www.ietf.org/rfc/rfc1950
* https://www.ietf.org/rfc/rfc1951