Previously the upscale test was changing the frame contents with incorrect data
before going back, but the algorithm relies on not changing contents for some
pixels by "skipping" them. Duplicated a bit of code to create a
non-destructive upscale test before decoding the whole frame.
There is only one file in this folder that is in scope of
GSoD - image_decoder.h. It was in great shape docwise though,
so not much review required.
The rest of the headers have received a doxy group definition.
The movies for Crusader: No Remorse have a unique decoder which is not too hard
to implement. Unfortunately, they don't properly implement the "compression"
FourCC, and instead put their ID in the "Stream Handler". Since supporting
them requires a change to the existing Image API, I thought I should make a
pull request for comments.
With this change, the movies in Crusader can all be played nicely.
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.
