Closed rayrobdod closed 4 months ago
https://wiki.mozilla.org/APNG_Specification
acTL
and fcTL
have no compressed parts. fdAT
is a u32 followed by a compressed data chunk.
fdAT
chunks for the same frame (between the same two fcTL
chunks) can be combined, like how IDAT
chunks can be combined, but doing so would require changing the sequence number of following APNG chunks to account for the reduced number of APNG chunks.
fd3549d20f2d679b308ef92ed550b92540f6a0d2
APNG is an extension to PNG adding several non-standard chunks (although the current w3c editor's draft of the PNG spec mentions the APNG chunks)