This allows the formation of `'static` futures that can still interact with a player. Async code will need to upgrade the weak reference in order to be able to interact with the player.
Due to some strangeness with the way Rust implemented unsafe-to-move behavior, boxed futures are implicitly `Unpin`. Which is useless to us.
The reason for this is a little counter-intuitive. Actually, the fact that Rust supports memory pinning at all is a little odd, because the core language explicitly requires all types be movable. To get around this, Pin requires that all !Unpin types be *born pinned*. This is because you can't re-pin an already unpinned value in memory.
Anyway, this necessitates this silly API change.
The endTime parameter of AudioParam.linearRampToValueAtTime is
on the global AudioContext's timeline, not local to the sound.
Adding the sound's start time to the parameter fixes sound
envelopes not playing back correctly.
`AudioBuffer.copyToChannel` does not work on Safari, so switch to
using `getChannelData` to fill the audio buffers.
Limitations in wasm-bindgen prevent us from actually modifying the
data returned by `getChannelData` on the Rust side, so import a JS
function to fill the audio buffer (js-src/ruffle-imports.js).
When a stream sound uses ADPCM compression, the ADPCM header is
included in each SoundStreamBlock (as opposed to stream sounds
in the other formats). This header wasn't being parsed, resulting
in corrupted audio (see https://homestarrunner.com/main12.swf).
Converts the Bitmap character to a proper display object. This can
be instantiated directly in a PlaceObject tag in SWFv9 movies,
compared to the previous versions which indirectly references
bitmaps from Shape tags.
The text bounds fields for a DefineFont2/3 tag can be a bogus empty
rectangle, per the SWF spec. We must properly the bounds ourselves
to render properly on web.
Many SWFs use "hairline" strokes which are 1 twip wide, but Flash
renders strokes with a minimum width of 1 pixel (20 twips).
SVG has no minimum, resulting in faint lines for the "hairline"
strokes. Clamp the minimum stroke width to 1 pixel to more closely
match the Flash Player.
On the web demo, if you played two different SWFs, color transforms
would stop working because the color matrix SVG filter would be
created twice with the same ID. Now we properly remove the previous
filter.