If we failed to decode a sample we'd presumably want to tell the user,
and we definitely don't want to just go into another round of decoding
somewhere in the middle of a broken sample.
Especially if buffered streams are involved, not filling the span
completely can also mean that we just ran out of filled buffer space and
we need to refill it on the beginning of the next read call.
This utility when given a .tff font provides options for disassembling:
- The 'fpgm' table, this a program that's run once when the font is
loaded. It's used to define instructions and functions used by used
by other programs.
- The 'prep' table, this is a general program that's run when ever
the font size (or other properties) changes.
- And the programs associated with any individual glyph.
The disassembly is printed in a format that matches the examples from:
https://learn.microsoft.com/en-us/typography/opentype/spec/tt_instructions
I'm mainly adding this because I think it's neat to be able to look
at these things, and think it'll be helpful for debugging an
interpreter.
With this you can see that all of the LiberationSerif-XXX.tff fonts in
Serenity have these programs ready to go.
This defines all the OpenType opcodes/instructions from the
specification:
https://learn.microsoft.com/en-us/typography/opentype/spec/tt_instructions
Each instructions has mnemonic and a range of possible opcodes (as some
of the bits are pretty much immediate value flags).
There's a little helper Instruction struct for accessing the flags and
any associated data (in the case of PUSH instructions).
Then the InstructionStream provides a way of iterating over all the
instructions in some bytes.
This was unintuitive, and only useful in a few cases. In the majority,
users had to immediately call `stop()`, and several who did want the
timer started would call `start()` on it immediately anyway. Case in
point: There are only two places I had to add a manual `start()`.
This implements a FlyString that will de-duplicate String instances. The
FlyString will store the raw encoded data of the String instance: If the
String is a short string, FlyString holds the String::ShortString bytes;
otherwise FlyString holds a pointer to the Detail::StringData.
FlyString itself does not know about String's storage or how to refcount
its Detail::StringData. It defers to String to implement these details.
This makes vector fonts load on macOS, where /usr/share/fonts doesn't
exist and Ladybird would only load the bitmap fonts from ./res/fonts
in the SerenityOS resource root directory.
Additionally, fonts in {/usr/share/local,~/.local}/fonts are now loaded
on Linux.
Drops were handled only by the Preview Widget previously. It probably
made a little more sense before the program redesign, as it took most of
window the space, but now honestly this idea doesn't hold up that well.
This simplifies the ownership model between DOM/layout/paint nodes
immensely by deferring to the garbage collector for figuring out what's
live and what's not.
Iterating byte by byte meant that the column positions assigned to INI
tokens would be off if there were any multi-byte codepoints. Using a
Utf8View means these positions refer to whole codepoints instead, and
the column positions match what GUI::TextEditor expects. :^)
Fixes#12706.
Before this patch, Core::SessionManagement::parse_path_with_sid() would
figure out the root session ID by sifting through /sys/kernel/processes.
That file can take quite a while to generate (sometimes up to 40ms on my
machine, which is a problem on its own!) and with no caching, many of
our programs were effectively doing this multiple times on startup when
unveiling something in /tmp/session/%sid/
While we should find ways to make generating /sys/kernel/processes fast
again, this patch addresses the specific problem by introducing a new
syscall: sys$get_root_session_id(). This extracts the root session ID
by looking directly at the process table and takes <1ms instead of 40ms.
This cuts WebContent process startup time by ~100ms on my machine. :^)
This needs to happen before prototype/constructor intitialization can be
made lazy. Otherwise, GC could run during the C++ constructor and try to
collect the object currently being created.
Currently, for each exposed interface, we generate one massive function
to create every Web constructor and prototype. In an effort to lazily
create these instead, this first step is to extract the creation of each
of these into its own method.
First, this generates a forwarding header for all IDL types. This is to
allow callers to remain unchanged without forcing them to include the
(very heavy) generated IDL headers. This header is included by LibWeb's
forwarding header.
Next, this defines a base template method on Web::Bindings::Intrinsics
to create a prototype/constructor pair. Specializations of this template
are now generated in a new .cpp file, IntrinsicDefinitions.cpp. The base
Intrinsics class is updated to use this new method, and will continue to
cache the result.
Last, some WebAssembly classes are updated to use this new mechanism.
They were using some ad hoc cache keys that are now in line with the
generated specializations.
That one massive function is still used to invoke these specializations,
so they are not lazy as of this commit.
