This allows, for example:
ThrowCompletionOr<Optional<Value>> foo()
{
return OptionalNone {};
}
The constructors and constraints here are lifted verbatim from
AK::Optional.
By replacing the `page_did_request_scroll_to()` calls with a request
to perform scrolling in the corresponding navigable, we ensure that
the scrolling of iframes will scroll within them instead of triggering
scroll of top level document.
There is already a parser for the time offset but it requires a positive
or negative sign. There are some weird formats on the web that do not
have the sign, so let's support that. I chose to implement this as a new
option instead of editing the old one to avoid any unknown breaking
changes.
Recently, we moved the resolution of CSS properties that do not affect
layout to occur within LayoutState::commit(). This decision was a
mistake as it breaks invalidation. With this change, we now re-resolve
all properties that do not affect layout before each repaint.
For pages containing images or embedded fonts, --dump-contents
used to dump a ton of binary data. That isn't very useful, so
stop doing it.
Before:
% time Build/lagom/bin/pdf --render out.png \
~/Downloads/0000/0000711.pdf --dump-contents | wc -l
937972
Now:
% time Build/lagom/bin/pdf --render out.png \
~/Downloads/0000/0000711.pdf --dump-contents | wc -l
6566
Printing 7k lines is also much faster than printing 940k,
0.15s instead of 2s.
WIFEXITED() returns a bool, so previously we were setting
exited_successfully to true when the service was terminated by a signal,
and false if it exited, regardless of the exit status. To test the exit
status, we have to use WEXITSTATUS() instead.
This causes us to correctly use the "3 tries then give up" logic for
services that crash, instead of infinitely attempting to respawn them.
bab2113ec1 made read_whitespace() return ErrorOr, which makes this
easy to do.
(7cafd7d177, which added the fixmes, landed slightly after bab2113ec1,
so not quite sure why it wasn't like this immediately. Maybe commit
order got changed during review; both commits were in #17831.)
No behavior change.
These were here due to the prefix-less name conflicting with a local
bool, but now that options are in a struct that's no longer a problem.
No behavior change.
`image` can't transform from RGB to CMYK yet, so the only way to
do this is by having a CMYK input.
For example, this works now (and it does a full decode and re-encode):
Build/lagom/bin/image -o out.jpg \
Tests/LibGfx/test-inputs/jpg/buggie-cmyk.jpg
Using this to convert `.pam` files written by `mutool extract`
to jpegs is a somewhat convenient method of looking at these
.pam files.
Previously `image -o foo.asdf foo.png` would create a 0-byte foo.asdf
before complaining that it doesn't know how to write .asdf images.
(Lifetimes of temporaries are extended to the end of the full
expresion, so this is fine.)
We always store CMYK data as YCCK, for two reasons:
1. If we ever want to do subsampling, then doing 2111 or
2112 makes sense with YCCK, while it doesn't make sense
if we store CMYK directly.
2. It forces us to write a color transform header. With a color
transform header, everyone agrees that the CMYK channels should
be stored inverted, while without it behavior between decoders
is inconsistent. (We could write an explicit color transform header
for CMYK too though, but with YCCK it's harder to forget since the
output will look wrong everywhere without it.)
initialize_mcu() grows a full CMYKBitmap override. Some of the
macroblock traversal could probably shared with some kind of
for_all_macroblocks() type function in the future, but the color
conversion math is different enough that this should be a separate
function.
Other than that, we pass around a mode parameter and make a few fuctions
write 4 instead of 3 channels, and that's it.
We use the luminance quantization and huffman tables for the K
channel.
`CMYKBitmap::to_low_quality_rgb()` morally still does the same thing,
but it has a slightly more scary name, and it doesn't use this exact
function. So let's toss it :^)
CMYK data describes which inks a printer should use to print a color.
If a screen should display a color that's supposed to look similar
to what the printer produces, it results in a color very different
to what Color::from_cmyk() produces. (It's also printer-dependent.)
There are many ICC profiles describing printing processes. It doesn't
matter too much which one we use -- most of them look somewhat
similar, and they all look dramatically better than Color::from_cmyk().
This patch adds a function to download a zip file that Adobe offers
on their web site. They even have a page for redistribution:
https://www.adobe.com/support/downloads/iccprofiles/icc_eula_win_dist.html
(That one leads to a broken download though, so this downloads the
end-user version.)
In case we have to move off this download at some point, there are also
a whole bunch of profiles at https://www.color.org/registry/index.xalter
that "may be used, embedded, exchanged, and shared without restriction".
The adobe zip contains a whole bunch of other useful and fun profiles,
so I went with it.
For now, this only unzips the USWebCoatedSWOP.icc file though, and
installs it in ${CMAKE_BINARY_DIR}/Root/res/icc/Adobe/CMYK/. In
Serenity builds, this will make it to /res/icc/Adobe/CMYK in the
disk image. And in lagom build, after #23016 this is the
lagom res staging directory that tools can install via
Core::ResourceImplementation. `pdf` and `MacPDF` already do that,
`TestPDF` now does it too.
The final piece is that LibPDF then loads the profile from there
and uses it for DeviceCMYK color conversions.
(Doing file access from the bowels of a library is a bit weird,
especially in a system that has sandboxing built in. But LibGfx does
that in FontDatabase too already, and LibPDF uses that, so it's not a
new problem.)
In cases where the stacking context painting requires a separate
bitmap, the destination position needs to be translated by the
scrolling offset to ensure it ends up in the correct position.
See #22821 for a previous attempt. This attempt should settle
things once and for all.
The opentype render path adjusts by `-font_ascender * -y_scale` in
Glyf::Glyph::append_simple_path(), so that's what we need to undo
to draw at the font's baseline.
(OpenType::Font::metrics() returns ascender scaled by y_scale already,
so no need to have the scale here where we undo the shift.)
Previously, we called `baseline()` which just returns the font's
font size, which is pretty meaningless:
https://tonsky.me/blog/font-size/https://simoncozens.github.io/fonts-and-layout/opentype.html#vertical-metrics-hhea-and-os2
Also, conceptually it makes sense to translate up by the ascender
to get from the upper edge of the glyph to the baseline.
This is a fairly simple JSON format: A single array, containing objects,
with the Annotation fields as key:value pairs.
When reading a file, we let invalid or missing keys fall back to the
default values. This is mostly intended to set a pattern so that if we
add new fields in the future, we won't fail to load old annotations
files. If loading the file fails though, we keep the previously loaded
set of annotations.
https://llvm.org/devmtg/2022-11/slides/TechTalk5-WhatDoesItTakeToRunLLVMBuildbots.pdf
has an xref table that starts like so:
```
xref
0 214
0000000002 65535 f
0000924663 00000 n
0000000003 00000 f
0000000000 00000 f
0000000016 00000 n
0000000160 00000 n
0000000263 00000 n
```
This is a list of objects in the PDF file. The lines ending with 'f'
mean that this object is "free", that is it's not stored in the file.
In this file, objects 0, 2, 3 are free. For free objects, the first
number is the offset of the next free object: Object 0 refers to object
2, 2 to 3, and 3 back to 0 (since it's the last free object).
The lines ending with "n" are actual objects; here the first number is
a byte offset to where that object is stored in the file.
Furthermore, the file contains
```
/Outlines
2
0
R
```
in its root object, meaning that object 2 stores the page outlines.
Since object 2 is set as free, there is no object 2. But the spec
says that an invalid object reference is just the null object.
This patch makes us return null objects for references to free
objects, and it also makes us treat a null object as /Outlines value
the same as not having /Outlines in the first place.
Fixes#23023 -- we can now open that file. (We don't render it super
well, but only for already-known reasons.)
Since I found it a bit confusing: XRefTable has two related methods
here:
1. has_object() returns if an object was explicitly listed in an
xref table. The first number right after `xref` is the start
index. So if an xref table were to start with `10`, we'd implicitly
create 10 trailing objects for which has_object() would return false
2. is_object_in_use() returns true if an object that was in a table
(i.e. one where has_object() returns true) was listed with 'n' and
false if it was listed with 'f'.
DocumentParser::parse_object_with_index() should probably return a null
object for the `!has_object()` case as well instead of VERIFY()ing
that has_object() is true. But I haven't seen this in the wild yet,
so keeping as-is for now.
This change addresses an issue with overflow clipping in scenarios
where `overflow: hidden` is applied to boxes nested within elements
with `overflow: scroll`.
Fixes https://github.com/SerenityOS/serenity/issues/22733
We should wait for a server thread to actually listen(2) a server socket
before trying to connect to it. This hopefully should make the test less
flaky.
This way, build files can install things into
`${CMAKE_BINARY_DIR}/Root/res/` and it'll work in both serenity and
lagom builds.
It allows using a single `Core::ResourceImplementation::install()`
call to install both checked-in and generated files (as long as both
get copied into this new build-time staging dir).
No behavior change.
