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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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21
components/script/layout_wrapper.rs
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@ -39,6 +39,7 @@ use dom::characterdata::LayoutCharacterDataHelpers;
use dom::document::{Document, LayoutDocumentHelpers, PendingRestyle};
use dom::element::{Element, LayoutElementHelpers, RawLayoutElementHelpers};
use dom::node::{CAN_BE_FRAGMENTED, DIRTY_ON_VIEWPORT_SIZE_CHANGE, HAS_DIRTY_DESCENDANTS, IS_IN_DOC};
use dom::node::{HANDLED_SNAPSHOT, HAS_SNAPSHOT};
use dom::node::{LayoutNodeHelpers, Node};
use dom::text::Text;
use gfx_traits::ByteIndex;
@ -413,6 +414,18 @@ impl<'le> TElement for ServoLayoutElement<'le> {
unsafe { self.as_node().node.get_flag(HAS_DIRTY_DESCENDANTS) }
}
fn has_snapshot(&self) -> bool {
unsafe { self.as_node().node.get_flag(HAS_SNAPSHOT) }
}
fn handled_snapshot(&self) -> bool {
unsafe { self.as_node().node.get_flag(HANDLED_SNAPSHOT) }
}
unsafe fn set_handled_snapshot(&self) {
self.as_node().node.set_flag(HANDLED_SNAPSHOT, true);
}
unsafe fn note_descendants<B: DescendantsBit<Self>>(&self) {
debug_assert!(self.get_data().is_some());
style::dom::raw_note_descendants::<Self, B>(*self);
@ -509,6 +522,14 @@ impl<'le> ServoLayoutElement<'le> {
}
}
pub unsafe fn unset_snapshot_flags(&self) {
self.as_node().node.set_flag(HAS_SNAPSHOT | HANDLED_SNAPSHOT, false);
}
pub unsafe fn set_has_snapshot(&self) {
self.as_node().node.set_flag(HAS_SNAPSHOT, true);
}
// FIXME(bholley): This should be merged with TElement::note_descendants,
// but that requires re-testing and possibly fixing the broken callers given
// the FIXME below, which I don't have time to do right now.