1. Rename `CelGetFrameStart` to `CelGetFrame`, in line with the other 2
functions with the same name and load the `uint32_t` safely.
2. Remove redundant `FrameHeader`, simply use `LoadLE16`.
3. Document all the functions.
Disabled by default because of these known issues:
1. When clicking on inventory item, it briefly appears a bit shifted (in the wrong coordinates).
This issue can happen with software cursor as well, but is a lot more
obvious with the hardware cursor.
2. Cursor is scaled with nearest-neighbour scaling, which may look a bit different from
how the rest of the graphics are scaled.
See also previous attempt: https://github.com/diasurgical/devilutionX/pull/955 by @viciious
Co-authored-by: Victor Luchits <vluchits@gmail.com>
Now that we no longer have a buffer border, we can render directly to
the video memory if the output surface is 8-bit and double buffering is
enabled.
Also adds a flag to force this even when double buffering is disabled,
because some systems emulate 8-bit mode with something else, so the
output is always buffered.
This required a tweak to the cursor to make sure that we clear it after
`SDL_Flip`.
This fixes a data race by deleting the sound exactly when it finishes
playing.
Previously, a data race could happen in
`CleanupFinishedDuplicateSounds`, where the sound would be destroyed
while Aulib was reading from its buffer.
`std::make_unique<T[]>(size)` always zero-initalizes the array.
C++20 has `std::make_unique_for_overwrite` to avoid that, while
older C++ versions can use the approach applied here.