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style: Add way to disable XBL in servo.
Adds a feature "moz_xbl" that when disabled causes the XBL code in servo to be stubbed out. Differential Revision: https://phabricator.services.mozilla.com/D45614
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f6b587051d
commit
112a68723e
2 changed files with 33 additions and 1 deletions
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@ -25,6 +25,7 @@ servo-layout-2020 = []
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gecko_debug = []
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gecko_refcount_logging = []
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gecko_profiler = []
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moz_xbl = []
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[dependencies]
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app_units = "0.7"
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@ -54,8 +54,12 @@ use crate::gecko_bindings::structs::NODE_DESCENDANTS_NEED_FRAMES;
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use crate::gecko_bindings::structs::NODE_NEEDS_FRAME;
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use crate::gecko_bindings::structs::{nsAtom, nsIContent, nsINode_BooleanFlag};
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use crate::gecko_bindings::structs::{
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nsINode as RawGeckoNode, nsXBLBinding as RawGeckoXBLBinding, Element as RawGeckoElement,
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nsINode as RawGeckoNode, Element as RawGeckoElement,
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};
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#[cfg(feature = "moz_xbl")]
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use crate::gecko_bindings::structs::nsXBLBinding as RawGeckoXBLBinding;
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#[cfg(not(feature = "moz_xbl"))]
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use values::Impossible;
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use crate::gecko_bindings::sugar::ownership::{HasArcFFI, HasSimpleFFI};
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use crate::global_style_data::GLOBAL_STYLE_DATA;
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use crate::hash::FxHashMap;
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@ -529,9 +533,11 @@ impl<'a> Iterator for GeckoChildrenIterator<'a> {
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}
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/// A Simple wrapper over a non-null Gecko `nsXBLBinding` pointer.
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#[cfg(feature = "moz_xbl")]
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#[derive(Clone, Copy)]
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pub struct GeckoXBLBinding<'lb>(pub &'lb RawGeckoXBLBinding);
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#[cfg(feature = "moz_xbl")]
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impl<'lb> GeckoXBLBinding<'lb> {
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#[inline]
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fn base_binding(&self) -> Option<Self> {
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@ -556,6 +562,23 @@ impl<'lb> GeckoXBLBinding<'lb> {
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}
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}
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/// A stub wraper for GeckoXBLBinding.
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#[cfg(not(feature = "moz_xbl"))]
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pub struct GeckoXBLBinding<'lb>(&'lb Impossible);
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#[cfg(not(feature = "moz_xbl"))]
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impl<'lb> GeckoXBLBinding<'lb> {
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#[inline]
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fn anon_content(&self) -> *const nsIContent {
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match *self.0 {}
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}
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fn binding_with_content(&self) -> Option<Self> {
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None
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}
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}
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/// A simple wrapper over a non-null Gecko `Element` pointer.
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#[derive(Clone, Copy)]
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pub struct GeckoElement<'le>(pub &'le RawGeckoElement);
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@ -681,11 +704,13 @@ impl<'le> GeckoElement<'le> {
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})
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}
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#[cfg(feature = "moz_xbl")]
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#[inline]
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fn may_be_in_binding_manager(&self) -> bool {
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self.flags() & (structs::NODE_MAY_BE_IN_BINDING_MNGR as u32) != 0
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}
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#[cfg(feature = "moz_xbl")]
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#[inline]
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fn xbl_binding(&self) -> Option<GeckoXBLBinding<'le>> {
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if !self.may_be_in_binding_manager() {
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@ -696,6 +721,12 @@ impl<'le> GeckoElement<'le> {
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unsafe { slots.mXBLBinding.mRawPtr.as_ref().map(GeckoXBLBinding) }
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}
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#[cfg(not(feature = "moz_xbl"))]
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#[inline]
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fn xbl_binding(&self) -> Option<GeckoXBLBinding<'le>> {
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None
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}
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#[inline]
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fn xbl_binding_with_content(&self) -> Option<GeckoXBLBinding<'le>> {
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self.xbl_binding().and_then(|b| b.binding_with_content())
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