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Flatten display list structure

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Instead of producing a tree of stacking contexts, display list
generation now produces a flat list of display items and a tree of
stacking contexts. This will eventually allow display list construction
to produce and modify WebRender vertex buffers directly, removing the
overhead of display list conversion.  This change also moves
layerization of the display list to the paint thread, since it isn't
currently useful for WebRender.

To accomplish this, display list generation now takes three passes of
the flow tree:

        1. Calculation of absolute positions.
        2. Collection of a tree of stacking contexts.
        3. Creation of a list of display items.

After collection of display items, they are sorted based upon the index
of their parent stacking contexts and their position in CSS 2.1
Appendeix E stacking order.

This is a big change, but it actually simplifies display list generation.
This commit is contained in:
Martin Robinson 2016-02-19 10:40:33 -08:00
parent 22ce878edc
commit e7019f2721
27 changed files with 1709 additions and 1861 deletions
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49
components/layout/query.rs
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@ -11,7 +11,7 @@ use euclid::rect::Rect;
use flow;
use flow_ref::FlowRef;
use fragment::{Fragment, FragmentBorderBoxIterator, SpecificFragmentInfo};
use gfx::display_list::{DisplayItemMetadata, OpaqueNode};
use gfx::display_list::OpaqueNode;
use layout_thread::LayoutThreadData;
use msg::constellation_msg::ConstellationChan;
use opaque_node::OpaqueNodeMethods;
@ -69,51 +69,40 @@ impl LayoutRPC for LayoutRPCImpl {
/// Requests the node containing the point of interest.
fn hit_test(&self, point: Point2D<f32>) -> Result<HitTestResponse, ()> {
let point = Point2D::new(Au::from_f32_px(point.x), Au::from_f32_px(point.y));
let resp = {
let &LayoutRPCImpl(ref rw_data) = self;
let rw_data = rw_data.lock().unwrap();
match rw_data.stacking_context {
None => panic!("no root stacking context!"),
Some(ref stacking_context) => {
let mut result = Vec::new();
stacking_context.hit_test(point, &mut result, true);
if !result.is_empty() {
Some(HitTestResponse(result[0].node.to_untrusted_node_address()))
} else {
None
}
}
}
let &LayoutRPCImpl(ref rw_data) = self;
let rw_data = rw_data.lock().unwrap();
let result = match rw_data.display_list {
None => panic!("Tried to hit test without a DisplayList"),
Some(ref display_list) => display_list.hit_test(point),
};
if resp.is_some() {
return Ok(resp.unwrap());
if result.is_empty() {
return Err(());
}
Err(())
Ok(HitTestResponse(result[0].node.to_untrusted_node_address()))
}
fn mouse_over(&self, point: Point2D<f32>) -> Result<MouseOverResponse, ()> {
let mut mouse_over_list: Vec<DisplayItemMetadata> = vec!();
let point = Point2D::new(Au::from_f32_px(point.x), Au::from_f32_px(point.y));
{
let mouse_over_list = {
let &LayoutRPCImpl(ref rw_data) = self;
let rw_data = rw_data.lock().unwrap();
match rw_data.stacking_context {
None => panic!("no root stacking context!"),
Some(ref stacking_context) => {
stacking_context.hit_test(point, &mut mouse_over_list, false);
}
}
let result = match rw_data.display_list {
None => panic!("Tried to hit test without a DisplayList"),
Some(ref display_list) => display_list.hit_test(point),
};
// Compute the new cursor.
let cursor = if !mouse_over_list.is_empty() {
mouse_over_list[0].pointing.unwrap()
let cursor = if !result.is_empty() {
result[0].pointing.unwrap()
} else {
Cursor::DefaultCursor
};
let ConstellationChan(ref constellation_chan) = rw_data.constellation_chan;
constellation_chan.send(ConstellationMsg::SetCursor(cursor)).unwrap();
}
result
};
if mouse_over_list.is_empty() {
Err(())