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gstreamer: Optimize various from/to Vec FFI translation functions

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Use memcpys if possible instead of manual loops, and directly write into
the `Vec` memory and set the length afterwards to avoid having the
reallocate logic at every step.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1181>
This commit is contained in:
Sebastian Dröge 2023-01-02 22:04:50 +02:00
parent 882513d33a
commit 036a020b62
1 changed files with 18 additions and 12 deletions
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30
gstreamer/src/miniobject.rs
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@ -194,8 +194,12 @@ macro_rules! mini_object_wrapper (
fn to_glib_none_from_slice(t: &'a [$name]) -> (*mut *mut $ffi_name, Self::Storage) {
skip_assert_initialized!();
let mut v_ptr = Vec::with_capacity(t.len() + 1);
v_ptr.extend(t.iter().map(|t| t.as_mut_ptr()));
v_ptr.push(std::ptr::null_mut());
unsafe {
let ptr = v_ptr.as_mut_ptr();
std::ptr::copy_nonoverlapping(t.as_ptr() as *mut *mut $ffi_name, ptr, t.len());
std::ptr::write(ptr.add(t.len()), std::ptr::null_mut());
v_ptr.set_len(t.len() + 1);
}
(v_ptr.as_ptr() as *mut *mut $ffi_name, (std::marker::PhantomData, Some(v_ptr)))
}
@ -204,12 +208,11 @@ macro_rules! mini_object_wrapper (
skip_assert_initialized!();
let v_ptr = unsafe {
let v_ptr = $crate::glib::ffi::g_malloc0(std::mem::size_of::<*mut $ffi_name>() * t.len() + 1)
let v_ptr = $crate::glib::ffi::g_malloc(std::mem::size_of::<*mut $ffi_name>() * t.len() + 1)
as *mut *mut $ffi_name;
for (i, t) in t.iter().enumerate() {
std::ptr::write(v_ptr.add(i), t.as_mut_ptr());
}
std::ptr::copy_nonoverlapping(t.as_ptr() as *mut *mut $ffi_name, v_ptr, t.len());
std::ptr::write(v_ptr.add(t.len()), std::ptr::null_mut());
v_ptr
};
@ -220,12 +223,13 @@ macro_rules! mini_object_wrapper (
fn to_glib_full_from_slice(t: &[$name]) -> *mut *mut $ffi_name {
skip_assert_initialized!();
unsafe {
let v_ptr = $crate::glib::ffi::g_malloc0(std::mem::size_of::<*mut $ffi_name>() * t.len() + 1)
let v_ptr = $crate::glib::ffi::g_malloc(std::mem::size_of::<*mut $ffi_name>() * t.len() + 1)
as *mut *mut $ffi_name;
for (i, s) in t.iter().enumerate() {
std::ptr::write(v_ptr.add(i), $crate::glib::translate::ToGlibPtr::to_glib_full(s));
}
std::ptr::write(v_ptr.add(t.len()), std::ptr::null_mut());
v_ptr
}
@ -305,10 +309,12 @@ macro_rules! mini_object_wrapper (
return Vec::new();
}
let mut res = Vec::with_capacity(num);
let mut res = Vec::<Self>::with_capacity(num);
let res_ptr = res.as_mut_ptr();
for i in 0..num {
res.push($crate::glib::translate::from_glib_none(std::ptr::read(ptr.add(i))));
::std::ptr::write(res_ptr.add(i), $crate::glib::translate::from_glib_none(std::ptr::read(ptr.add(i))));
}
res.set_len(num);
res
}
@ -324,9 +330,9 @@ macro_rules! mini_object_wrapper (
}
let mut res = Vec::with_capacity(num);
for i in 0..num {
res.push($crate::glib::translate::from_glib_full(std::ptr::read(ptr.add(i))));
}
let res_ptr = res.as_mut_ptr();
::std::ptr::copy_nonoverlapping(ptr as *mut Self, res_ptr, num);
res.set_len(num);
$crate::glib::ffi::g_free(ptr as *mut _);
res
}