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Ensure unique LayerIds for pseudo-elements

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Currently pseudo-elements, like the fragments created for ::before and
::after, with layers will have the same LayerId as the body of their
owning fragments. Instead all LayerIds should be unique.

Fixes #2010.
This commit is contained in:
Martin Robinson 2015-09-08 18:59:30 -07:00
parent 1b6d4daf85
commit 1e6f797268
9 changed files with 128 additions and 41 deletions
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13
components/layout/flow.rs
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@ -48,7 +48,7 @@ use wrapper::{PseudoElementType, ThreadSafeLayoutNode};
use euclid::{Point2D, Rect, Size2D};
use gfx::display_list::ClippingRegion;
use msg::compositor_msg::LayerId;
use msg::compositor_msg::{LayerId, LayerType};
use msg::constellation_msg::ConstellationChan;
use rustc_serialize::{Encoder, Encodable};
use std::fmt;
@ -359,9 +359,16 @@ pub trait Flow: fmt::Debug + Sync + Send + 'static {
/// Returns a layer ID for the given fragment.
#[allow(unsafe_code)]
fn layer_id(&self, fragment_id: u32) -> LayerId {
fn layer_id(&self) -> LayerId {
let obj = unsafe { mem::transmute::<&&Self, &raw::TraitObject>(&self) };
LayerId(obj.data as usize, fragment_id, 0)
LayerId::new_of_type(LayerType::FragmentBody, obj.data as usize)
}
/// Returns a layer ID for the given fragment.
#[allow(unsafe_code)]
fn layer_id_for_overflow_scroll(&self) -> LayerId {
let obj = unsafe { mem::transmute::<&&Self, &raw::TraitObject>(&self) };
LayerId::new_of_type(LayerType::OverflowScroll, obj.data as usize)
}
/// Attempts to perform incremental fixup of this flow by replacing its fragment's style with