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.
Renamed `AudioBackend::play_sound` to `start_sound`, and this
also takes a `SoundInfo` parameter with the event sound settings
from the SWF file.
Desktop now obeys the loop and start/end point settings. Envelopes
are still TODO.
Previously Performance.now() was used to grab the initial timestamp
for calculating dt in requestAnimationFrame. However, this doesn't
seem to be reliable and resulted in negative dt values in Chrome.
Now we just use an Option for the timestamp and initialize it to None.
The first animation callback will set the timestamp.
DefineBitsJPEG3 tags also include a zlib-encoded alpha channel.
This wasn't working on web (it was trying to use the raw RBGA also
an image!) Now these are re-encoded to PNG.
Addresses #27.
Player is now in charge of scaling/cropping/translating the content
to fit the viewport size supplied by the frontend.
Added backend::render::Letterbox, which stores the margin sizes
for letter/pillarboxing.
Firefox would fudge with the dimensions of the SVG when we tried
to draw a scaled SVG to the canvas. Disabling preserveAspectRatio
prevents that. Fixes part of #24.
Firefox required the color matrix filter to be inside and <svg>
tag. Also, set color-interpolation-filters to sRGB to ensure
color transforms match Flash's output.
DefineBitsJPEG tags can have some extraneous bytes inside the
stream. Splice these out when decoding the JPEG.
TODO: Docs say this should only happen for SWF versions before 8?
Mike Welsh