Previously, the PNGDecoder would always convert images that
have a palette with a transparent color(s) to a full RGBA
surface automatically. There needed to be a way to diable
this and keep the image paletted for the Glk engine, since
some Infocom V6 game Blorb files reuse the palettes from
previous images, so I couldn't have the decoder using the
dummy palette that comes with the image
Symbols for codes shorter than the prefix table index width are stored
in the table. All the entries in the table with an index starting with
the code are set to the symbol value. That way, when decoding it is
possible to get the number of bits corresponding to the table width from
the bitstream and directly find the symbol value. Longer code still need
to be searched for in the codes list.
Add limited support for unpacked PICT bits which FPFP Mac requires.
SCI games use packed PICT bits unless an image is less than 8 bytes
per row in which case they can't be packed, like FPFP's shovel icon.
Fixes bug #7059 which prevents the game from being completed.
From what I understand, this has something to do with the image
being either made up from two or three parts. When it's made from
three parts, the frame should be displayed for half again as long
as normal.
This makes the speed of the Zork: Grand Inquisitor video look
about right to me. It's still out of sync, but it doesn't seem to
get *more* out of sync as the video progresses.
Starship Titanic produces lots of "uninitialized value" warnings
at the very beginning of the game, when turning right. This is
because in the very first movie frame it uses codebooks that have
not been loaded. Explicitly set their data to 0 to guarantee
consistent behavior.
Thanks to @dafioram for noticing the problem & sending an initial
patch, and to @wjp for noticing further that the PNG reader did not
even use the end info struct it created either.
Fixes Trac#10217. Closes gh-1028.
All users of BitStream were in fact using a specific, hardcoded variant,
so we can hardcode that variant, removing the need for virtual calls,
and enabling inlining.
Paul Gilbert
SupSuper
Bastien Bouclet
sluicebox
Cameron Cawley
Torbjörn Andersson
Adrian Frühwirth
Colin Snover
Willem Jan Palenstijn
Eugene Sandulenko
Simei Yin
D G Turner