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auto merge of #3839 : pcwalton/servo/fewer-moves-in-dls, r=glennw

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r? @glennw
This commit is contained in:
bors-servo 2014-10-28 17:57:43 -06:00
commit 651ef60b1c
4 changed files with 96 additions and 99 deletions
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94
components/gfx/display_list/mod.rs
View file

@ -19,16 +19,16 @@ use render_context::RenderContext;
use text::glyph::CharIndex;
use text::TextRun;
use collections::dlist::DList;
use collections::dlist;
use collections::Deque;
use collections::dlist::{mod, DList};
use geom::{Point2D, Rect, SideOffsets2D, Size2D, Matrix2D};
use libc::uintptr_t;
use servo_net::image::base::Image;
use servo_util::dlist as servo_dlist;
use servo_util::geometry::Au;
use servo_util::opts;
use servo_util::range::Range;
use std::fmt;
use std::mem;
use std::slice::Items;
use style::computed_values::border_style;
use sync::Arc;
@ -183,12 +183,8 @@ struct StackingContext {
}
impl StackingContext {
/// Creates a stacking context from a display list.
fn new(list: DisplayList) -> StackingContext {
let DisplayList {
list: list
} = list;
/// Creates a stacking context from a display list, consuming that display list in the process.
fn new(list: &mut DisplayList) -> StackingContext {
let mut stacking_context = StackingContext {
background_and_borders: DisplayList::new(),
block_backgrounds_and_borders: DisplayList::new(),
@ -197,30 +193,29 @@ impl StackingContext {
positioned_descendants: Vec::new(),
};
for item in list.into_iter() {
match item.base().level {
while !list.list.is_empty() {
let mut head = DisplayList::from_list(servo_dlist::split(&mut list.list));
match head.front().unwrap().base().level {
BackgroundAndBordersStackingLevel => {
stacking_context.background_and_borders.push(item)
stacking_context.background_and_borders.append_from(&mut head)
}
BlockBackgroundsAndBordersStackingLevel => {
stacking_context.block_backgrounds_and_borders.push(item)
stacking_context.block_backgrounds_and_borders.append_from(&mut head)
}
FloatStackingLevel => stacking_context.floats.push(item),
ContentStackingLevel => stacking_context.content.push(item),
FloatStackingLevel => stacking_context.floats.append_from(&mut head),
ContentStackingLevel => stacking_context.content.append_from(&mut head),
PositionedDescendantStackingLevel(z_index) => {
match stacking_context.positioned_descendants
.iter_mut()
.find(|& &(z, _)| z_index == z) {
Some(&(_, ref mut my_list)) => {
my_list.push(item);
my_list.append_from(&mut head);
continue
}
None => {}
}
let mut new_list = DisplayList::new();
new_list.list.push(item);
stacking_context.positioned_descendants.push((z_index, new_list))
stacking_context.positioned_descendants.push((z_index, head))
}
}
}
@ -266,16 +261,29 @@ impl DisplayList {
}
}
/// Creates a new display list from the given list of display items.
fn from_list(list: DList<DisplayItem>) -> DisplayList {
DisplayList {
list: list,
}
}
/// Appends the given item to the display list.
#[inline]
pub fn push(&mut self, item: DisplayItem) {
self.list.push(item)
self.list.push(item);
}
/// Appends the given display list to this display list, consuming the other display list in
/// the process.
pub fn push_all_move(&mut self, other: DisplayList) {
self.list.append(other.list)
/// Appends the items in the given display list to this one, removing them in the process.
#[inline]
pub fn append_from(&mut self, other: &mut DisplayList) {
servo_dlist::append_from(&mut self.list, &mut other.list)
}
/// Returns the first display item in this list.
#[inline]
fn front(&self) -> Option<&DisplayItem> {
self.list.front()
}
pub fn debug(&self) {
@ -309,20 +317,27 @@ impl DisplayList {
/// steps in CSS 2.1 § E.2.
///
/// This must be called before `draw_into_context()` is for correct results.
pub fn flatten(self, resulting_level: StackingLevel) -> DisplayList {
// TODO(pcwalton): Sort positioned children according to z-index.
pub fn flatten(&mut self, resulting_level: StackingLevel) {
// Fast paths:
if self.list.len() == 0 {
return
}
if self.list.len() == 1 {
self.set_stacking_level(resulting_level);
return
}
let mut result = DisplayList::new();
let StackingContext {
background_and_borders,
block_backgrounds_and_borders,
floats,
content,
positioned_descendants: mut positioned_descendants
mut background_and_borders,
mut block_backgrounds_and_borders,
mut floats,
mut content,
mut positioned_descendants
} = StackingContext::new(self);
debug_assert!(self.list.is_empty());
// Steps 1 and 2: Borders and background for the root.
result.push_all_move(background_and_borders);
self.append_from(&mut background_and_borders);
// Sort positioned children according to z-index.
positioned_descendants.sort_by(|&(z_index_a, _), &(z_index_b, _)| {
@ -332,32 +347,31 @@ impl DisplayList {
// Step 3: Positioned descendants with negative z-indices.
for &(ref mut z_index, ref mut list) in positioned_descendants.iter_mut() {
if *z_index < 0 {
result.push_all_move(mem::replace(list, DisplayList::new()))
self.append_from(list)
}
}
// Step 4: Block backgrounds and borders.
result.push_all_move(block_backgrounds_and_borders);
self.append_from(&mut block_backgrounds_and_borders);
// Step 5: Floats.
result.push_all_move(floats);
self.append_from(&mut floats);
// TODO(pcwalton): Step 6: Inlines that generate stacking contexts.
// Step 7: Content.
result.push_all_move(content);
self.append_from(&mut content);
// Steps 8 and 9: Positioned descendants with nonnegative z-indices.
for &(ref mut z_index, ref mut list) in positioned_descendants.iter_mut() {
if *z_index >= 0 {
result.push_all_move(mem::replace(list, DisplayList::new()))
self.append_from(list)
}
}
// TODO(pcwalton): Step 10: Outlines.
result.set_stacking_level(resulting_level);
result
self.set_stacking_level(resulting_level);
}
/// Sets the stacking level for this display list and all its subitems.

82
components/layout/display_list_builder.rs
View file

@ -36,6 +36,7 @@ use gfx::render_task::RenderLayer;
use servo_msg::compositor_msg::{FixedPosition, Scrollable};
use servo_msg::constellation_msg::{ConstellationChan, FrameRectMsg};
use servo_net::image::holder::ImageHolder;
use servo_util::dlist;
use servo_util::geometry::{mod, Au, ZERO_RECT};
use servo_util::logical_geometry::{LogicalRect, WritingMode};
use servo_util::opts;
@ -117,12 +118,10 @@ impl FragmentDisplayListBuilding for Fragment {
// doesn't have a fragment".
let background_color = style.resolve_color(style.get_background().background_color);
if !background_color.alpha.approx_eq(&0.0) {
let display_item = box SolidColorDisplayItem {
list.push(SolidColorDisplayItemClass(box SolidColorDisplayItem {
base: BaseDisplayItem::new(*absolute_bounds, self.node, level, *clip_rect),
color: background_color.to_gfx_color(),
};
list.push(SolidColorDisplayItemClass(display_item))
}));
}
// The background image is painted on top of the background color.
@ -205,13 +204,12 @@ impl FragmentDisplayListBuilding for Fragment {
};
// Create the image display item.
let image_display_item = ImageDisplayItemClass(box ImageDisplayItem {
list.push(ImageDisplayItemClass(box ImageDisplayItem {
base: BaseDisplayItem::new(bounds, self.node, level, clip_rect),
image: image.clone(),
stretch_size: Size2D(Au::from_px(image.width as int),
Au::from_px(image.height as int)),
});
list.push(image_display_item)
}));
}
/// Adds the display items necessary to paint the borders of this fragment to a display list if
@ -233,7 +231,7 @@ impl FragmentDisplayListBuilding for Fragment {
let left_color = style.resolve_color(style.get_border().border_left_color);
// Append the border to the display list.
let border_display_item = box BorderDisplayItem {
list.push(BorderDisplayItemClass(box BorderDisplayItem {
base: BaseDisplayItem::new(*abs_bounds, self.node, level, *clip_rect),
border: border.to_physical(style.writing_mode),
color: SideOffsets2D::new(top_color.to_gfx_color(),
@ -244,9 +242,7 @@ impl FragmentDisplayListBuilding for Fragment {
style.get_border().border_right_style,
style.get_border().border_bottom_style,
style.get_border().border_left_style)
};
list.push(BorderDisplayItemClass(border_display_item))
}));
}
fn build_debug_borders_around_text_fragments(&self,
@ -263,7 +259,7 @@ impl FragmentDisplayListBuilding for Fragment {
fragment_bounds.size);
// Compute the text fragment bounds and draw a border surrounding them.
let border_display_item = box BorderDisplayItem {
display_list.push(BorderDisplayItemClass(box BorderDisplayItem {
base: BaseDisplayItem::new(absolute_fragment_bounds,
self.node,
ContentStackingLevel,
@ -271,8 +267,7 @@ impl FragmentDisplayListBuilding for Fragment {
border: SideOffsets2D::new_all_same(Au::from_px(1)),
color: SideOffsets2D::new_all_same(color::rgb(0, 0, 200)),
style: SideOffsets2D::new_all_same(border_style::solid)
};
display_list.push(BorderDisplayItemClass(border_display_item));
}));
// Draw a rectangle representing the baselines.
let ascent = text_fragment.run.ascent();
@ -303,7 +298,7 @@ impl FragmentDisplayListBuilding for Fragment {
fragment_bounds.size);
// This prints a debug border around the border of this fragment.
let border_display_item = box BorderDisplayItem {
display_list.push(BorderDisplayItemClass(box BorderDisplayItem {
base: BaseDisplayItem::new(absolute_fragment_bounds,
self.node,
ContentStackingLevel,
@ -311,8 +306,7 @@ impl FragmentDisplayListBuilding for Fragment {
border: SideOffsets2D::new_all_same(Au::from_px(1)),
color: SideOffsets2D::new_all_same(color::rgb(0, 0, 200)),
style: SideOffsets2D::new_all_same(border_style::solid)
};
display_list.push(BorderDisplayItemClass(border_display_item))
}));
}
fn build_display_list(&mut self,
@ -442,7 +436,7 @@ impl FragmentDisplayListBuilding for Fragment {
tmp.to_physical(self.style.writing_mode, container_size) + flow_origin
};
let text_display_item = box TextDisplayItem {
display_list.push(TextDisplayItemClass(box TextDisplayItem {
base: BaseDisplayItem::new(absolute_content_box,
self.node,
ContentStackingLevel,
@ -452,8 +446,7 @@ impl FragmentDisplayListBuilding for Fragment {
text_color: self.style().get_color().color.to_gfx_color(),
orientation: orientation,
baseline_origin: baseline_origin,
};
display_list.push(TextDisplayItemClass(text_display_item));
}));
// Create display items for text decoration
{
@ -522,16 +515,14 @@ impl FragmentDisplayListBuilding for Fragment {
debug!("(building display list) building image fragment");
// Place the image into the display list.
let image_display_item = box ImageDisplayItem {
display_list.push(ImageDisplayItemClass(box ImageDisplayItem {
base: BaseDisplayItem::new(absolute_content_box,
self.node,
ContentStackingLevel,
*clip_rect),
image: image.clone(),
stretch_size: absolute_content_box.size,
};
display_list.push(ImageDisplayItemClass(image_display_item))
}));
}
None => {
// No image data at all? Do nothing.
@ -630,38 +621,35 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
.relative_containing_block_size);
// Add the box that starts the block context.
let mut display_list = DisplayList::new();
self.fragment.build_display_list(&mut display_list,
self.base.display_list = DisplayList::new();
let absolute_position =
self.base.abs_position.add_size(&relative_offset.to_physical(self.base.writing_mode));
self.fragment.build_display_list(&mut self.base.display_list,
layout_context,
self.base.abs_position.add_size(
&relative_offset.to_physical(self.base.writing_mode)),
absolute_position,
background_border_level,
&self.base.clip_rect);
let mut child_layers = DList::new();
for kid in self.base.child_iter() {
self.base.layers = DList::new();
for kid in self.base.children.iter_mut() {
if kid.is_absolutely_positioned() {
// All absolute flows will be handled by their containing block.
continue
}
display_list.push_all_move(mem::replace(&mut flow::mut_base(kid).display_list,
DisplayList::new()));
child_layers.append(mem::replace(&mut flow::mut_base(kid).layers, DList::new()))
self.base.display_list.append_from(&mut flow::mut_base(kid).display_list);
dlist::append_from(&mut self.base.layers, &mut flow::mut_base(kid).layers)
}
// Process absolute descendant links.
for abs_descendant_link in self.base.abs_descendants.iter() {
// TODO(pradeep): Send in our absolute position directly.
display_list.push_all_move(mem::replace(
&mut flow::mut_base(abs_descendant_link).display_list,
DisplayList::new()));
child_layers.append(mem::replace(&mut flow::mut_base(abs_descendant_link).layers,
DList::new()));
self.base
.display_list
.append_from(&mut flow::mut_base(abs_descendant_link).display_list);
dlist::append_from(&mut self.base.layers,
&mut flow::mut_base(abs_descendant_link).layers)
}
self.base.display_list = display_list;
self.base.layers = child_layers
}
fn build_display_list_for_absolutely_positioned_block(&mut self,
@ -672,9 +660,7 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
!self.base.flags.needs_layer() {
// We didn't need a layer.
let z_index = self.fragment.style().get_box().z_index.number_or_zero();
let level = PositionedDescendantStackingLevel(z_index);
self.base.display_list = mem::replace(&mut self.base.display_list,
DisplayList::new()).flatten(level);
self.base.display_list.flatten(PositionedDescendantStackingLevel(z_index));
return
}
@ -690,10 +676,10 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
} else {
Scrollable
};
let display_list = mem::replace(&mut self.base.display_list, DisplayList::new());
self.base.display_list.flatten(ContentStackingLevel);
let new_layer = RenderLayer {
id: self.layer_id(0),
display_list: Arc::new(display_list.flatten(ContentStackingLevel)),
display_list: Arc::new(mem::replace(&mut self.base.display_list, DisplayList::new())),
position: Rect(origin, size),
background_color: color::rgba(1.0, 1.0, 1.0, 0.0),
scroll_policy: scroll_policy,
@ -703,8 +689,6 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
fn build_display_list_for_floating_block(&mut self, layout_context: &LayoutContext) {
self.build_display_list_for_block(layout_context, RootOfStackingContextLevel);
self.base.display_list = mem::replace(&mut self.base.display_list,
DisplayList::new()).flatten(FloatStackingLevel)
self.base.display_list.flatten(FloatStackingLevel)
}
}

8
components/layout/inline.rs
View file

@ -19,7 +19,7 @@ use wrapper::ThreadSafeLayoutNode;
use collections::{Deque, RingBuf};
use geom::{Rect, Size2D};
use gfx::display_list::{ContentLevel, DisplayList};
use gfx::display_list::ContentLevel;
use gfx::font::FontMetrics;
use gfx::font_context::FontContext;
use gfx::text::glyph::CharIndex;
@ -1199,9 +1199,9 @@ impl Flow for InlineFlow {
match fragment.specific {
InlineBlockFragment(ref mut block_flow) => {
let block_flow = block_flow.flow_ref.deref_mut();
self.base.display_list.push_all_move(
mem::replace(&mut flow::mut_base(block_flow).display_list,
DisplayList::new()));
self.base
.display_list
.append_from(&mut flow::mut_base(block_flow).display_list)
}
_ => {}
}

11
components/layout/layout_task.rs
View file

@ -743,11 +743,10 @@ impl LayoutTask {
debug!("Done building display list. Display List = {}",
flow::base(layout_root.deref()).display_list);
let root_display_list =
mem::replace(&mut flow::mut_base(layout_root.deref_mut()).display_list,
DisplayList::new());
root_display_list.debug();
let display_list = Arc::new(root_display_list.flatten(ContentStackingLevel));
flow::mut_base(&mut *layout_root).display_list.flatten(ContentStackingLevel);
let display_list =
Arc::new(mem::replace(&mut flow::mut_base(&mut *layout_root).display_list,
DisplayList::new()));
// FIXME(pcwalton): This is really ugly and can't handle overflow: scroll. Refactor
// it with extreme prejudice.
@ -787,7 +786,7 @@ impl LayoutTask {
scroll_policy: Scrollable,
};
rw_data.display_list = Some(display_list.clone());
rw_data.display_list = Some(display_list);
// TODO(pcwalton): Eventually, when we have incremental reflow, this will have to
// be smarter in order to handle retained layer contents properly from reflow to