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layout: Don't call establishes_stacking_context() so much.

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That function is expensive because it has to check a lot.
This commit is contained in:
Patrick Walton 2016-03-02 15:41:02 -08:00
parent dd5c574d7f
commit 72a52e23e0
2 changed files with 25 additions and 11 deletions
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21
components/layout/block.rs
View file

@ -1622,14 +1622,18 @@ impl BlockFlow {
}
}
pub fn establishes_pseudo_stacking_context(&self) -> bool {
pub fn block_stacking_context_type(&self) -> BlockStackingContextType {
if self.fragment.establishes_stacking_context() {
return false;
return BlockStackingContextType::StackingContext
}
self.base.flags.contains(IS_ABSOLUTELY_POSITIONED) ||
if self.base.flags.contains(IS_ABSOLUTELY_POSITIONED) ||
self.fragment.style.get_box().position != position::T::static_ ||
self.base.flags.is_float()
self.base.flags.is_float() {
BlockStackingContextType::PseudoStackingContext
} else {
BlockStackingContextType::NonstackingContext
}
}
pub fn has_scrolling_overflow(&self) -> bool {
@ -3037,3 +3041,12 @@ impl ISizeAndMarginsComputer for InlineBlockReplaced {
MaybeAuto::Specified(fragment.content_inline_size())
}
}
/// A stacking context, a pseudo-stacking context, or a non-stacking context.
#[derive(Copy, Clone, PartialEq)]
pub enum BlockStackingContextType {
NonstackingContext,
PseudoStackingContext,
StackingContext,
}

13
components/layout/display_list_builder.rs
View file

@ -12,7 +12,7 @@
use app_units::{Au, AU_PER_PX};
use azure::azure_hl::Color;
use block::BlockFlow;
use block::{BlockFlow, BlockStackingContextType};
use canvas_traits::{CanvasMsg, CanvasPixelData, CanvasData, FromLayoutMsg};
use context::LayoutContext;
use euclid::num::Zero;
@ -1607,8 +1607,8 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
parent_id: StackingContextId,
contexts: &mut Vec<Box<StackingContext>>)
-> StackingContextId {
if !self.fragment.establishes_stacking_context() &&
!self.establishes_pseudo_stacking_context() {
let block_stacking_context_type = self.block_stacking_context_type();
if block_stacking_context_type == BlockStackingContextType::NonstackingContext {
self.base.stacking_context_id = parent_id;
self.base.collect_stacking_contexts_for_children(parent_id, contexts);
return parent_id;
@ -1630,7 +1630,7 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
self.base.collect_stacking_contexts_for_children(inner_stacking_context_id,
&mut child_contexts);
if self.establishes_pseudo_stacking_context() {
if block_stacking_context_type == BlockStackingContextType::PseudoStackingContext {
let creation_mode = if self.base.flags.contains(IS_ABSOLUTELY_POSITIONED) ||
self.fragment.style.get_box().position != position::T::static_ {
StackingContextCreationMode::PseudoPositioned
@ -1698,10 +1698,11 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
fn build_display_list_for_block(&mut self,
state: &mut DisplayListBuildState,
border_painting_mode: BorderPaintingMode) {
let establishes_stacking_context = self.fragment.establishes_stacking_context();
let background_border_section = if self.base.flags.is_float() {
DisplayListSection::BackgroundAndBorders
} else if self.base.flags.contains(IS_ABSOLUTELY_POSITIONED) {
if self.fragment.establishes_stacking_context() {
if establishes_stacking_context {
DisplayListSection::BackgroundAndBorders
} else {
DisplayListSection::BlockBackgroundsAndBorders
@ -1711,7 +1712,7 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
};
// Add the box that starts the block context.
let translated_clip = if self.fragment.establishes_stacking_context() {
let translated_clip = if establishes_stacking_context {
Some(self.base.clip.translate(&-self.base.stacking_relative_position))
} else {
None