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style: Add bindings for ArcSlice and ThinArc, and use them to reduce copies of SVG path data.

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As I said over bug 1549593, the eventual goal is to use ArcSlice in all
inherited properties. But this seemed like a good first candidate that doesn't
require me to move around a lot more code, since we were already using cbindgen
for the path commands.

Differential Revision: https://phabricator.services.mozilla.com/D30134
This commit is contained in:
Emilio Cobos Álvarez 2019-05-09 12:43:19 +00:00
parent 0d5c4481b8
commit f429c28f23
5 changed files with 39 additions and 41 deletions
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8
components/servo_arc/lib.rs
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@ -308,6 +308,9 @@ impl<T: ?Sized> Arc<T> {
impl<T: ?Sized> Clone for Arc<T> {
#[inline]
fn clone(&self) -> Self {
// NOTE(emilio): If you change anything here, make sure that the
// implementation in layout/style/ServoStyleConstsInlines.h matches!
//
// Using a relaxed ordering to check for STATIC_REFCOUNT is safe, since
// `count` never changes between STATIC_REFCOUNT and other values.
if self.inner().count.load(Relaxed) != STATIC_REFCOUNT {
@ -416,6 +419,9 @@ impl<T: ?Sized> Arc<T> {
impl<T: ?Sized> Drop for Arc<T> {
#[inline]
fn drop(&mut self) {
// NOTE(emilio): If you change anything here, make sure that the
// implementation in layout/style/ServoStyleConstsInlines.h matches!
//
// Using a relaxed ordering to check for STATIC_REFCOUNT is safe, since
// `count` never changes between STATIC_REFCOUNT and other values.
if self.inner().count.load(Relaxed) == STATIC_REFCOUNT {
@ -571,6 +577,7 @@ impl<T: Serialize> Serialize for Arc<T> {
/// Structure to allow Arc-managing some fixed-sized data and a variably-sized
/// slice in a single allocation.
#[derive(Debug, Eq, PartialEq, PartialOrd)]
#[repr(C)]
pub struct HeaderSlice<H, T: ?Sized> {
/// The fixed-sized data.
pub header: H,
@ -743,6 +750,7 @@ impl<H, T> Arc<HeaderSlice<H, [T]>> {
/// Header data with an inline length. Consumers that use HeaderWithLength as the
/// Header type in HeaderSlice can take advantage of ThinArc.
#[derive(Debug, Eq, PartialEq, PartialOrd)]
#[repr(C)]
pub struct HeaderWithLength<H> {
/// The fixed-sized data.
pub header: H,