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layout: Move overflow calculation to be a separate, sequential,

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bottom-up pass.

Right now, the only reason that overflow calculation works is that we
rely on script inducing extra reflows that are sent for display. This
was preventing #10021 from landing.

This change regresses layout performance by about 1% in my tests.

Fixes #7797 properly.
This commit is contained in:
Patrick Walton 2016-03-17 14:28:37 -07:00
parent 2d6283c64b
commit 5ea8c34276
7 changed files with 60 additions and 17 deletions
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35
components/layout/incremental.rs
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@ -16,27 +16,31 @@ bitflags! {
#[doc = "Currently unused; need to decide how this propagates."]
const REPAINT = 0x01,
#[doc = "Recompute the overflow regions (bounding box of object and all descendants)."]
#[doc = "Propagates down the flow tree because the computation is bottom-up."]
const STORE_OVERFLOW = 0x02,
#[doc = "Recompute intrinsic inline_sizes (minimum and preferred)."]
#[doc = "Propagates down the flow tree because the computation is"]
#[doc = "bottom-up."]
const BUBBLE_ISIZES = 0x02,
const BUBBLE_ISIZES = 0x04,
#[doc = "Recompute actual inline-sizes and block-sizes, only taking out-of-flow children \
into account. \
Propagates up the flow tree because the computation is top-down."]
const REFLOW_OUT_OF_FLOW = 0x04,
const REFLOW_OUT_OF_FLOW = 0x08,
#[doc = "Recompute actual inline_sizes and block_sizes."]
#[doc = "Propagates up the flow tree because the computation is"]
#[doc = "top-down."]
const REFLOW = 0x08,
const REFLOW = 0x10,
#[doc = "Re-resolve generated content. \
Propagates up the flow tree because the computation is inorder."]
const RESOLVE_GENERATED_CONTENT = 0x10,
const RESOLVE_GENERATED_CONTENT = 0x20,
#[doc = "The entire flow needs to be reconstructed."]
const RECONSTRUCT_FLOW = 0x20
const RECONSTRUCT_FLOW = 0x40
}
}
@ -56,7 +60,7 @@ impl TRestyleDamage for RestyleDamage {
/// Use this instead of `RestyleDamage::all()` because `RestyleDamage::all()` will result in
/// unnecessary sequential resolution of generated content.
fn rebuild_and_reflow() -> RestyleDamage {
REPAINT | BUBBLE_ISIZES | REFLOW_OUT_OF_FLOW | REFLOW | RECONSTRUCT_FLOW
REPAINT | STORE_OVERFLOW | BUBBLE_ISIZES | REFLOW_OUT_OF_FLOW | REFLOW | RECONSTRUCT_FLOW
}
}
@ -66,9 +70,10 @@ impl RestyleDamage {
/// we should add to the *parent* of this flow.
pub fn damage_for_parent(self, child_is_absolutely_positioned: bool) -> RestyleDamage {
if child_is_absolutely_positioned {
self & (REPAINT | REFLOW_OUT_OF_FLOW | RESOLVE_GENERATED_CONTENT)
self & (REPAINT | STORE_OVERFLOW | REFLOW_OUT_OF_FLOW | RESOLVE_GENERATED_CONTENT)
} else {
self & (REPAINT | REFLOW | REFLOW_OUT_OF_FLOW | RESOLVE_GENERATED_CONTENT)
self & (REPAINT | STORE_OVERFLOW | REFLOW | REFLOW_OUT_OF_FLOW |
RESOLVE_GENERATED_CONTENT)
}
}
@ -108,6 +113,7 @@ impl fmt::Display for RestyleDamage {
let to_iter =
[ (REPAINT, "Repaint")
, (STORE_OVERFLOW, "StoreOverflow")
, (BUBBLE_ISIZES, "BubbleISizes")
, (REFLOW_OUT_OF_FLOW, "ReflowOutOfFlow")
, (REFLOW, "Reflow")
@ -165,13 +171,13 @@ pub fn compute_damage(old: Option<&Arc<ComputedValues>>, new: &ComputedValues) -
]);
add_if_not_equal!(old, new, damage,
[ REPAINT, REFLOW_OUT_OF_FLOW ], [
[ REPAINT, STORE_OVERFLOW, REFLOW_OUT_OF_FLOW ], [
get_positionoffsets.top, get_positionoffsets.left,
get_positionoffsets.right, get_positionoffsets.bottom
]);
add_if_not_equal!(old, new, damage,
[ REPAINT, BUBBLE_ISIZES, REFLOW_OUT_OF_FLOW, REFLOW ], [
[ REPAINT, STORE_OVERFLOW, BUBBLE_ISIZES, REFLOW_OUT_OF_FLOW, REFLOW ], [
get_border.border_top_width, get_border.border_right_width,
get_border.border_bottom_width, get_border.border_left_width,
get_margin.margin_top, get_margin.margin_right,
@ -183,7 +189,14 @@ pub fn compute_damage(old: Option<&Arc<ComputedValues>>, new: &ComputedValues) -
]);
add_if_not_equal!(old, new, damage,
[ REPAINT, BUBBLE_ISIZES, REFLOW_OUT_OF_FLOW, REFLOW, RECONSTRUCT_FLOW ], [
[
REPAINT,
STORE_OVERFLOW,
BUBBLE_ISIZES,
REFLOW_OUT_OF_FLOW,
REFLOW,
RECONSTRUCT_FLOW
], [
get_box.float, get_box.display, get_box.position, get_box.content,
get_counters.counter_reset, get_counters.counter_increment,
get_list.quotes, get_list.list_style_type,