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A few small bits of refactoring to prepare for more advanced DisplayList layerization #7710

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merged 3 commits into from Sep 24, 2015
+143 −151
Merged

A few small bits of refactoring to prepare for more advanced DisplayList layerization #7710

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117c278
Move DisplayList drawing logic to struct implementation
mrobinson Sep 22, 2015
71b83d6
Pass PaintTile to painting threads
mrobinson Sep 22, 2015
31a5eea
Remove an unused function
mrobinson Sep 22, 2015
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255 components/gfx/display_list/mod.rs
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@@ -17,7 +17,7 @@
#![deny(unsafe_code)]

use azure::azure::AzFloat;
use azure::azure_hl::Color;
use azure::azure_hl::{Color, DrawTarget};
use display_list::optimizer::DisplayListOptimizer;
use euclid::approxeq::ApproxEq;
use euclid::num::Zero;
@@ -99,7 +99,7 @@ pub struct DisplayList {
/// Child stacking contexts.
pub children: LinkedList<Arc<StackingContext>>,
/// Child PaintLayers that will be rendered on top of everything else.
pub layered_children: LinkedList<PaintLayer>,
pub layered_children: LinkedList<Arc<PaintLayer>>,
}

impl DisplayList {
@@ -118,27 +118,6 @@ impl DisplayList {
}
}

/// Sort all children by their z-index and split layered children into their own
/// section of the display list.
/// TODO(mrobinson): This should properly handle unlayered children that are on
/// top of layered children.
#[inline]
pub fn sort_and_layerize_children(&mut self) {
let mut children: SmallVec<[Arc<StackingContext>; 8]> = SmallVec::new();
while let Some(stacking_context) = self.children.pop_front() {
children.push(stacking_context);
}
children.sort_by(|this, other| this.z_index.cmp(&other.z_index));

for stacking_context in children.into_iter() {
match stacking_context.layer_id {
Some(layer_id) => self.layered_children.push_back(
PaintLayer::new(layer_id, color::transparent(), stacking_context)),
None => self.children.push_back(stacking_context),
}
}
}

/// Appends all display items from `other` into `self`, preserving stacking order and emptying
/// `other` in the process.
#[inline]
@@ -239,6 +218,113 @@ impl DisplayList {
paint_layer.stacking_context.print_with_tree(print_tree);
}
}

/// Draws the DisplayList in stacking context order according to the steps in CSS 2.1 § E.2.
fn draw_into_context(&self,
draw_target: &DrawTarget,
paint_context: &mut PaintContext,
transform: &Matrix4,
clip_rect: Option<&Rect<Au>>) {
let mut paint_subcontext = PaintContext {
draw_target: draw_target.clone(),
font_context: &mut *paint_context.font_context,
page_rect: paint_context.page_rect,
screen_rect: paint_context.screen_rect,
clip_rect: clip_rect.map(|clip_rect| *clip_rect),
transient_clip: None,
layer_kind: paint_context.layer_kind,
};

if opts::get().dump_display_list_optimized {
self.print(format!("Optimized display list. Tile bounds: {:?}",
paint_context.page_rect));
}

// Set up our clip rect and transform.
let old_transform = paint_subcontext.draw_target.get_transform();
let xform_2d = Matrix2D::new(transform.m11, transform.m12,
transform.m21, transform.m22,
transform.m41, transform.m42);
paint_subcontext.draw_target.set_transform(&xform_2d);
paint_subcontext.push_clip_if_applicable();

// Steps 1 and 2: Borders and background for the root.
for display_item in &self.background_and_borders {
display_item.draw_into_context(&mut paint_subcontext)
}

// Step 3: Positioned descendants with negative z-indices.
for positioned_kid in &self.children {
if positioned_kid.z_index >= 0 {
break
}
let new_transform =
transform.translate(positioned_kid.bounds
.origin
.x
.to_nearest_px() as AzFloat,
positioned_kid.bounds
.origin
.y
.to_nearest_px() as AzFloat,
0.0);
positioned_kid.optimize_and_draw_into_context(&mut paint_subcontext,
&new_transform,
Some(&positioned_kid.overflow))
}

// Step 4: Block backgrounds and borders.
for display_item in &self.block_backgrounds_and_borders {
display_item.draw_into_context(&mut paint_subcontext)
}

// Step 5: Floats.
for display_item in &self.floats {
display_item.draw_into_context(&mut paint_subcontext)
}

// TODO(pcwalton): Step 6: Inlines that generate stacking contexts.

// Step 7: Content.
for display_item in &self.content {
display_item.draw_into_context(&mut paint_subcontext)
}

// Step 8: Positioned descendants with `z-index: auto`.
for display_item in &self.positioned_content {
display_item.draw_into_context(&mut paint_subcontext)
}

// Step 9: Positioned descendants with nonnegative, numeric z-indices.
for positioned_kid in &self.children {
if positioned_kid.z_index < 0 {
continue
}
let new_transform =
transform.translate(positioned_kid.bounds
.origin
.x
.to_nearest_px() as AzFloat,
positioned_kid.bounds
.origin
.y
.to_nearest_px() as AzFloat,
0.0);
positioned_kid.optimize_and_draw_into_context(&mut paint_subcontext,
&new_transform,
Some(&positioned_kid.overflow))
}

// Step 10: Outlines.
for display_item in &self.outlines {
display_item.draw_into_context(&mut paint_subcontext)
}

// Undo our clipping and transform.
paint_subcontext.remove_transient_clip_if_applicable();
paint_subcontext.pop_clip_if_applicable();
paint_subcontext.draw_target.set_transform(&old_transform)
}
}

#[derive(HeapSizeOf, Deserialize, Serialize)]
@@ -343,107 +429,11 @@ impl StackingContext {
clip_rect: Option<&Rect<Au>>) {
let temporary_draw_target =
paint_context.get_or_create_temporary_draw_target(&self.filters, self.blend_mode);
{
let mut paint_subcontext = PaintContext {
draw_target: temporary_draw_target.clone(),
font_context: &mut *paint_context.font_context,
page_rect: paint_context.page_rect,
screen_rect: paint_context.screen_rect,
clip_rect: clip_rect.map(|clip_rect| *clip_rect),
transient_clip: None,
layer_kind: paint_context.layer_kind,
};

if opts::get().dump_display_list_optimized {
display_list.print(format!("Optimized display list. Tile bounds: {:?}",
paint_context.page_rect));
}

// Set up our clip rect and transform.
let old_transform = paint_subcontext.draw_target.get_transform();
let xform_2d = Matrix2D::new(transform.m11, transform.m12,
transform.m21, transform.m22,
transform.m41, transform.m42);
paint_subcontext.draw_target.set_transform(&xform_2d);
paint_subcontext.push_clip_if_applicable();

// Steps 1 and 2: Borders and background for the root.
for display_item in &display_list.background_and_borders {
display_item.draw_into_context(&mut paint_subcontext)
}

// Step 3: Positioned descendants with negative z-indices.
for positioned_kid in &display_list.children {
if positioned_kid.z_index >= 0 {
break
}
let new_transform =
transform.translate(positioned_kid.bounds
.origin
.x
.to_nearest_px() as AzFloat,
positioned_kid.bounds
.origin
.y
.to_nearest_px() as AzFloat,
0.0);
positioned_kid.optimize_and_draw_into_context(&mut paint_subcontext,
&new_transform,
Some(&positioned_kid.overflow))
}

// Step 4: Block backgrounds and borders.
for display_item in &display_list.block_backgrounds_and_borders {
display_item.draw_into_context(&mut paint_subcontext)
}

// Step 5: Floats.
for display_item in &display_list.floats {
display_item.draw_into_context(&mut paint_subcontext)
}

// TODO(pcwalton): Step 6: Inlines that generate stacking contexts.

// Step 7: Content.
for display_item in &display_list.content {
display_item.draw_into_context(&mut paint_subcontext)
}

// Step 8: Positioned descendants with `z-index: auto`.
for display_item in &display_list.positioned_content {
display_item.draw_into_context(&mut paint_subcontext)
}

// Step 9: Positioned descendants with nonnegative, numeric z-indices.
for positioned_kid in &self.display_list.children {
if positioned_kid.z_index < 0 {
continue
}
let new_transform =
transform.translate(positioned_kid.bounds
.origin
.x
.to_nearest_px() as AzFloat,
positioned_kid.bounds
.origin
.y
.to_nearest_px() as AzFloat,
0.0);
positioned_kid.optimize_and_draw_into_context(&mut paint_subcontext,
&new_transform,
Some(&positioned_kid.overflow))
}

// Step 10: Outlines.
for display_item in &display_list.outlines {
display_item.draw_into_context(&mut paint_subcontext)
}

// Undo our clipping and transform.
paint_subcontext.remove_transient_clip_if_applicable();
paint_subcontext.pop_clip_if_applicable();
paint_subcontext.draw_target.set_transform(&old_transform)
}
display_list.draw_into_context(&temporary_draw_target,
paint_context,
transform,
clip_rect);

paint_context.draw_temporary_draw_target_if_necessary(&temporary_draw_target,
&self.filters,
@@ -694,8 +684,8 @@ impl StackingContextLayerCreator {
stacking_context.display_list.layered_children.back().unwrap().id.companion_layer_id();
let child_stacking_context =
Arc::new(stacking_context.create_layered_child(next_layer_id, display_list));
stacking_context.display_list.layered_children.push_back(
PaintLayer::new(next_layer_id, color::transparent(), child_stacking_context));
stacking_context.display_list.layered_children.push_back(Arc::new(
PaintLayer::new(next_layer_id, color::transparent(), child_stacking_context)));
self.all_following_children_need_layers = true;
}
}
@@ -706,7 +696,7 @@ impl StackingContextLayerCreator {
if let Some(layer_id) = stacking_context.layer_id {
self.finish_building_current_layer(parent_stacking_context);
parent_stacking_context.display_list.layered_children.push_back(
PaintLayer::new(layer_id, color::transparent(), stacking_context));
Arc::new(PaintLayer::new(layer_id, color::transparent(), stacking_context)));

// We have started processing layered stacking contexts, so any stacking context that
// we process from now on needs its own layer to ensure proper rendering order.
@@ -724,17 +714,18 @@ impl StackingContextLayerCreator {
}

/// Returns the stacking context in the given tree of stacking contexts with a specific layer ID.
pub fn find_stacking_context_with_layer_id(this: &Arc<StackingContext>, layer_id: LayerId)
-> Option<Arc<StackingContext>> {
pub fn find_layer_with_layer_id(this: &Arc<StackingContext>,
layer_id: LayerId)
-> Option<Arc<PaintLayer>> {
for kid in &this.display_list.layered_children {
if let Some(stacking_context) = kid.find_stacking_context_with_layer_id(layer_id) {
return Some(stacking_context);
if let Some(paint_layer) = PaintLayer::find_layer_with_layer_id(&kid, layer_id) {
return Some(paint_layer);
}
}

for kid in &this.display_list.children {
if let Some(stacking_context) = find_stacking_context_with_layer_id(kid, layer_id) {
return Some(stacking_context);
if let Some(paint_layer) = find_layer_with_layer_id(kid, layer_id) {
return Some(paint_layer);
}
}

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