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.
The current version of jpeg-decoder on crates.io (0.1.15) panics
when encountering a valid JPEG marker of length 2. Some SWF files
contained JPEGs with a COM segment of length 2. This is fixed
on the master branch of jpeg-decoder.
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?
Switch from pixels to twips for internal calculations. swf crate
was updated to add a Twips wrapper-type. Ruffle will use this type
internally for transforms and shapes. This fixes some precision
errors in rendering (see heroes_of_cybertron.swf) and will match
what the Flash Player does internally more closely. (e.g.
DisplayObject x and y will be quantized to 1/20 pixel units). It
is up to the renderer to convert units from twip space to pixels
when rendering.