cICP was written after PLTE, not before. The other chunks were output
in an order which does not match the new PNG-v3 "priority" order.
This change outputs all chunks in the "priority" order; highest
precedence first. This means that the PNGs so written conform to
PNG v3 (cICP), and allow a streaming app to handle chunks in order,
without buffering data which may later be overridden.
Note that PNG-v3 establishes the idea of dropping ancillary chunks
which are inconveniently ordered in the definition of how APNG chunks
are handled.
This is a cherry-pick of commit 945f2602a0ea05a7938b2f52df9ef16cf3440291
from branch 'libpng18'.
Reviewed-by: Cosmin Truta <ctruta@gmail.com>
Signed-off-by: John Bowler <jbowler@acm.org>
Signed-off-by: Cosmin Truta <ctruta@gmail.com>
Update the main CMake file and the auxiliary test scripts accordingly.
This is a cherry-pick of commit fe277b7752990be35523832a546aec478437968a
from branch 'libpng18'.
