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Auto merge of #7710 - mrobinson:small-dl-refactor, r=pcwalton

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

This will be useful when PaintLayers that contain DisplayLists instead
of StackingContexts need to draw themselves. This is a simple
preparatory refactoring and doesn't change any behavior.

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This commit is contained in:
bors-servo 2015-09-23 17:22:31 -06:00
commit 09b970af4a
2 changed files with 143 additions and 151 deletions
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255
components/gfx/display_list/mod.rs
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@ -15,7 +15,7 @@
//! low-level drawing primitives.
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;
@ -97,7 +97,7 @@ 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 {
@ -116,27 +116,6 @@ 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]
@ -237,6 +216,113 @@ 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)]
@ -341,107 +427,11 @@ 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,
@ -692,8 +682,8 @@ 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;
}
}
@ -704,7 +694,7 @@ 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.
@ -722,17 +712,18 @@ 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);
}
}