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Bug 1355343: Take all the snapshots into account. r=bholley
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>
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16 changed files with 439 additions and 308 deletions
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@ -62,7 +62,7 @@ use properties::{Importance, PropertyDeclaration, PropertyDeclarationBlock};
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use properties::animated_properties::{AnimationValue, AnimationValueMap, TransitionProperty};
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use properties::style_structs::Font;
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use rule_tree::CascadeLevel as ServoCascadeLevel;
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use selector_parser::{ElementExt, Snapshot};
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use selector_parser::ElementExt;
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use selectors::Element;
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use selectors::matching::{ElementSelectorFlags, StyleRelations};
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use selectors::parser::{AttrSelector, NamespaceConstraint};
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@ -363,6 +363,10 @@ impl<'le> GeckoElement<'le> {
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/// Clear the element data for a given element.
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pub fn clear_data(&self) {
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let ptr = self.0.mServoData.get();
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unsafe {
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self.unset_flags(ELEMENT_HAS_SNAPSHOT as u32 |
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ELEMENT_HANDLED_SNAPSHOT as u32);
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}
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if !ptr.is_null() {
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debug!("Dropping ElementData for {:?}", self);
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let data = unsafe { Box::from_raw(self.0.mServoData.get()) };
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@ -391,11 +395,6 @@ impl<'le> GeckoElement<'le> {
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},
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}
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}
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/// Creates a blank snapshot for this element.
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pub fn create_snapshot(&self) -> Snapshot {
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Snapshot::new(*self)
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}
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}
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/// Converts flags from the layout used by rust-selectors to the layout used
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@ -591,6 +590,19 @@ impl<'le> TElement for GeckoElement<'le> {
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}
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}
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fn has_snapshot(&self) -> bool {
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self.flags() & (ELEMENT_HAS_SNAPSHOT as u32) != 0
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}
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fn handled_snapshot(&self) -> bool {
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self.flags() & (ELEMENT_HANDLED_SNAPSHOT as u32) != 0
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}
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unsafe fn set_handled_snapshot(&self) {
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debug_assert!(self.get_data().is_some());
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self.set_flags(ELEMENT_HANDLED_SNAPSHOT as u32)
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}
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fn has_dirty_descendants(&self) -> bool {
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self.flags() & (ELEMENT_HAS_DIRTY_DESCENDANTS_FOR_SERVO as u32) != 0
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}
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