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gfx: Sort layers according to their Z-index value before handing them

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off to the compositor.

Closes #7166.
This commit is contained in:
Patrick Walton 2015-08-19 16:30:00 -07:00
parent ac4ca05337
commit 277cbf407e
4 changed files with 57 additions and 0 deletions
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8
components/gfx/paint_task.rs
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@ -27,6 +27,7 @@ use msg::constellation_msg::PipelineExitType;
use profile_traits::mem::{self, ReportsChan};
use profile_traits::time::{self, profile};
use rand::{self, Rng};
use smallvec::SmallVec;
use skia::gl_context::GLContext;
use std::borrow::ToOwned;
use std::mem as std_mem;
@ -393,7 +394,14 @@ impl<C> PaintTask<C> where C: PaintListener + Send + 'static {
}
};
// Sort positioned children according to z-index.
let mut positioned_children: SmallVec<[Arc<StackingContext>; 8]> = SmallVec::new();
for kid in &stacking_context.display_list.children {
positioned_children.push((*kid).clone());
}
positioned_children.sort_by(|this, other| this.z_index.cmp(&other.z_index));
for kid in positioned_children.iter() {
build(properties, &**kid, &page_position, &transform, &perspective, next_parent_id)
}
}