Version 1 (modified by 4 years ago) ( diff ) | ,
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GRAPHICS INTERCHANGE FORMAT
GrafX2 format of predilection is GIF.
GrafX2 uses the GIF89a spec for saving : https://www.w3.org/Graphics/GIF/spec-gif89a.txt
it supports a few extensions :
- NETSCAPE animation extension
- GFX2PATH original path saving extension
- GFX2MODE Special Drawing mode saving extension
- CRNG Color cycling extension
NETSCAPE animation extension
see http://www.vurdalakov.net/misc/gif/netscape-looping-application-extension
GFX2PATH
Stores the original file path. This is used by the backup system.
The format is :
0x21 Extension Label 0xFF Application Extension Label 0x0B Block Size "GFX2PATH" Application Identifier (8 bytes) "\0\0\0" Application Authentication Code (3 bytes) 0xll Sub-block Data Size : path size (including null) "..path.." path (null-terminated) 0xll Sub-block Data Size : filename size (including null) "..file.." file name (null-terminated) 0x00 Block terminator
GFX2MODE
extension to store ::IMAGE_MODES :
0x21 Extension Label 0xFF Application Extension Label 0x0B Block Size "GFX2MODE" Application Identifier (8 bytes) "2.6" Application Authentication Code (3 bytes) 0xll Sub-block Data Size string label ... More sub blocks can be added in the future 0x00 Block terminator
Supported values (as of GrafX2 2.6) :
- "LAYERED" (not written)
- "ANIMATION" (not written)
- "ZX_SPECTRUM"
- "GAMEBOYCOLOR"
- "THOMSON40COL"
- "CPC_EGX"
- "CPC_EGX2"
- "CPC_MODE5"
- "CPC_RASTER"
- "C64_HIRES"
- "C64_MULTICOLOR"
- "C64_FLI"
- "APPLE2_HGR"
- "APPLE2_DHGR"
CRNG color cycling extension
Same content as a CRNG IFF chunk
0x21 Extension Label 0xFF Application Extension Label 0x0B Block Size "CRNG\0\0\0\0" "CRNG" Application Identifier (8 bytes) "1.0" Application Authentication Code (3 bytes) 0xll Sub-block Data Size (6 bytes per color cycle) For each color cycle : 0xRRRR (big endian) Rate 0xFFFF (big endian) Flags 0xSS start (lower color index) 0xEE end (higher color index) 0x00 Block terminator
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