XZ writes filters in the order that they are used during compression, so
we need to process them in the reverse order while decompression.
This wasn't noticed earlier because we only supported the LZMA2 filter.
This makes the code a bit more readable and in conjunction with the
ModRM helper should prevent some operand ordering bugs.
This also includes one incidental bugfix:
`sign_extend_32_to_64_bits`, was not setting the `REX.R` bit when
appropriate,
And one size obvious optimization:
We may now elide the REX prefix on `xor eax, eax` as storing to a 32 bit
register clears the upper 32 bit of said register, which is wanted here.
This also widens the argument coverage of some helpers, to allow
memory offsets, this also consolidates the displacement size choosing.
This also stops us from some out argument ordering bugs, as we now just
need to look up the correct calling convention and call the correct
function.
This change makes RecordingPainter to emit a FillRect command instead
of FillRectWithRoundedCorners if all corners have a radius = 0.
`fill_rect_with_rounded_corners()` in LibGfx already has a similar
optimization. But now when we also have LibAccelGfx, which does not
support painting rectangles with rounded corners yet, it makes sense to
emit FillRect whenever possible.
This change introduces a new 2D graphics library that uses OpenGL to
perform painting operations. For now, it has extremely limited
functionality and supports only rectangle painting, but we have to
start somewhere.
Since this library is intended to be used by LibWeb, where the
WebContent process does not have an associated window, painting occurs
in an offscreen buffer created using EGL.
For now it is only possible to compile this library on linux.
Offscreen context creation on SerenityOS and MacOS will have to be
implemented separately in the future.
Co-Authored-By: Andreas Kling <awesomekling@gmail.com>
Since all conditional instructions use a certain number of bits to
encode the condition type (from my observation of `Jcc`, `SETcc` and
`CMOVcc`), let's abuse that to deduplicate some code!
This adds a `Condition` enum that defines the type of condition we are
jumping based on, whose underlying values are the values that must be
encoded to trigger each condition.
The `test` instruction will have the same result as `cmp` when
comparing to zero, so let's always emit that code. This has no effect
until the following commit.
