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Bug 1355343: Take all the snapshots into account. r=bholley

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I've chosen this approach mainly because there's no other good way to guarantee
the model is correct than holding the snapshots alive until a style refresh.

What I tried before this (storing them in a sort of "immutable element data") is
a pain, since we call into style from the frame constructor and other content
notifications, which makes keeping track of which snapshots should be cleared an
which shouldn't an insane task.

Ideally we'd have a single entry-point for style, but that's not the case right
now, and changing that requires pretty non-trivial changes to the frame
constructor.

MozReview-Commit-ID: FF1KWZv2iBM
Signed-off-by: Emilio Cobos Álvarez <emilio@crisal.io>
This commit is contained in:
Emilio Cobos Álvarez 2017-05-07 16:36:47 +02:00
parent 7d45aad9b4
commit 46bf5d61f0
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GPG key ID: 056B727BB9C1027C
16 changed files with 439 additions and 308 deletions
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24
components/style/gecko/wrapper.rs
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@ -62,7 +62,7 @@ use properties::{Importance, PropertyDeclaration, PropertyDeclarationBlock};
use properties::animated_properties::{AnimationValue, AnimationValueMap, TransitionProperty};
use properties::style_structs::Font;
use rule_tree::CascadeLevel as ServoCascadeLevel;
use selector_parser::{ElementExt, Snapshot};
use selector_parser::ElementExt;
use selectors::Element;
use selectors::matching::{ElementSelectorFlags, StyleRelations};
use selectors::parser::{AttrSelector, NamespaceConstraint};
@ -363,6 +363,10 @@ impl<'le> GeckoElement<'le> {
/// Clear the element data for a given element.
pub fn clear_data(&self) {
let ptr = self.0.mServoData.get();
unsafe {
self.unset_flags(ELEMENT_HAS_SNAPSHOT as u32 |
ELEMENT_HANDLED_SNAPSHOT as u32);
}
if !ptr.is_null() {
debug!("Dropping ElementData for {:?}", self);
let data = unsafe { Box::from_raw(self.0.mServoData.get()) };
@ -391,11 +395,6 @@ impl<'le> GeckoElement<'le> {
},
}
}
/// Creates a blank snapshot for this element.
pub fn create_snapshot(&self) -> Snapshot {
Snapshot::new(*self)
}
}
/// Converts flags from the layout used by rust-selectors to the layout used
@ -591,6 +590,19 @@ impl<'le> TElement for GeckoElement<'le> {
}
}
fn has_snapshot(&self) -> bool {
self.flags() & (ELEMENT_HAS_SNAPSHOT as u32) != 0
}
fn handled_snapshot(&self) -> bool {
self.flags() & (ELEMENT_HANDLED_SNAPSHOT as u32) != 0
}
unsafe fn set_handled_snapshot(&self) {
debug_assert!(self.get_data().is_some());
self.set_flags(ELEMENT_HANDLED_SNAPSHOT as u32)
}
fn has_dirty_descendants(&self) -> bool {
self.flags() & (ELEMENT_HAS_DIRTY_DESCENDANTS_FOR_SERVO as u32) != 0
}