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https://github.com/servo/servo.git
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Flatten display list structure
Instead of producing a tree of stacking contexts, display list
generation now produces a flat list of display items and a tree of
stacking contexts. This will eventually allow display list construction
to produce and modify WebRender vertex buffers directly, removing the
overhead of display list conversion. This change also moves
layerization of the display list to the paint thread, since it isn't
currently useful for WebRender.
To accomplish this, display list generation now takes three passes of
the flow tree:
1. Calculation of absolute positions.
2. Collection of a tree of stacking contexts.
3. Creation of a list of display items.
After collection of display items, they are sorted based upon the index
of their parent stacking contexts and their position in CSS 2.1
Appendeix E stacking order.
This is a big change, but it actually simplifies display list generation.
This commit is contained in:
Martin Robinson
parent
22ce878edc
commit
e7019f2721
27 changed files with 1709 additions and 1861 deletions
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@ -12,8 +12,8 @@ use azure::azure_hl::Color;
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use euclid::num::Zero;
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use euclid::{Point2D, Rect, Size2D};
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use gfx::display_list::{BorderRadii, BoxShadowClipMode, ClippingRegion};
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use gfx::display_list::{DisplayItem, DisplayList};
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use gfx::display_list::{GradientStop, StackingContext};
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use gfx::display_list::{DisplayItem, DisplayList, DisplayListEntry, DisplayListSection};
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use gfx::display_list::{DisplayListTraversal, GradientStop, StackingContext, StackingContextType};
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use gfx_traits::ScrollPolicy;
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use msg::constellation_msg::ConvertPipelineIdToWebRender;
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use style::computed_values::filter::{self, Filter};
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@ -21,31 +21,59 @@ use style::computed_values::{image_rendering, mix_blend_mode};
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use style::values::computed::BorderStyle;
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use webrender_traits;
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pub trait WebRenderStackingContextConverter {
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trait WebRenderStackingContextConverter {
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fn convert_to_webrender<'a>(&self,
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traversal: &mut DisplayListTraversal<'a>,
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api: &webrender_traits::RenderApi,
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pipeline_id: webrender_traits::PipelineId,
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epoch: webrender_traits::Epoch,
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scroll_layer_id: Option<webrender_traits::ScrollLayerId>)
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-> webrender_traits::StackingContextId;
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fn convert_children_to_webrender<'a>(&self,
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traversal: &mut DisplayListTraversal<'a>,
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api: &webrender_traits::RenderApi,
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pipeline_id: webrender_traits::PipelineId,
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epoch: webrender_traits::Epoch,
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scroll_layer_id: Option<webrender_traits::ScrollLayerId>,
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builder: &mut webrender_traits::DisplayListBuilder,
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force_positioned_stacking_level: bool);
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fn web_render_stacking_level(&self) -> webrender_traits::StackingLevel;
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}
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pub trait WebRenderDisplayListConverter {
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fn convert_to_webrender(&self,
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api: &webrender_traits::RenderApi,
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pipeline_id: webrender_traits::PipelineId,
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epoch: webrender_traits::Epoch,
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scroll_layer_id: Option<webrender_traits::ScrollLayerId>)
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-> webrender_traits::StackingContextId;
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}
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trait WebRenderDisplayListConverter {
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fn convert_to_webrender(&self,
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api: &webrender_traits::RenderApi,
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pipeline_id: webrender_traits::PipelineId,
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epoch: webrender_traits::Epoch) -> webrender_traits::DisplayListBuilder;
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-> webrender_traits::StackingContextId;
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}
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trait WebRenderDisplayItemConverter {
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fn convert_to_webrender(&self,
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api: &webrender_traits::RenderApi,
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pipeline_id: webrender_traits::PipelineId,
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epoch: webrender_traits::Epoch,
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level: webrender_traits::StackingLevel,
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builder: &mut webrender_traits::DisplayListBuilder);
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}
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trait WebRenderDisplayListEntryConverter {
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fn web_render_stacking_level(&self) -> webrender_traits::StackingLevel;
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}
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impl WebRenderDisplayListEntryConverter for DisplayListEntry {
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fn web_render_stacking_level(&self) -> webrender_traits::StackingLevel {
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match self.section {
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DisplayListSection::BackgroundAndBorders =>
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webrender_traits::StackingLevel::BackgroundAndBorders,
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DisplayListSection::BlockBackgroundsAndBorders =>
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webrender_traits::StackingLevel::BlockBackgroundAndBorders,
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DisplayListSection::Content => webrender_traits::StackingLevel::Content,
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DisplayListSection::Outlines => webrender_traits::StackingLevel::Outlines,
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}
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}
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}
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trait ToBorderStyle {
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fn to_border_style(&self) -> webrender_traits::BorderStyle;
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}
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@ -235,11 +263,55 @@ impl ToFilterOps for filter::T {
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}
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impl WebRenderStackingContextConverter for StackingContext {
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fn convert_to_webrender(&self,
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api: &webrender_traits::RenderApi,
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pipeline_id: webrender_traits::PipelineId,
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epoch: webrender_traits::Epoch,
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scroll_layer_id: Option<webrender_traits::ScrollLayerId>)
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fn convert_children_to_webrender<'a>(&self,
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traversal: &mut DisplayListTraversal<'a>,
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api: &webrender_traits::RenderApi,
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pipeline_id: webrender_traits::PipelineId,
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epoch: webrender_traits::Epoch,
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scroll_layer_id: Option<webrender_traits::ScrollLayerId>,
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builder: &mut webrender_traits::DisplayListBuilder,
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force_positioned_stacking_level: bool) {
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for child in self.children.iter() {
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while let Some(item) = traversal.advance(self) {
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let stacking_level = if force_positioned_stacking_level {
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webrender_traits::StackingLevel::PositionedContent
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} else {
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item.web_render_stacking_level()
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};
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item.item.convert_to_webrender(stacking_level, builder);
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}
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if child.context_type == StackingContextType::Real {
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let stacking_context_id = child.convert_to_webrender(traversal,
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api,
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pipeline_id,
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epoch,
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None);
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builder.push_stacking_context(child.web_render_stacking_level(),
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stacking_context_id);
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} else {
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child.convert_children_to_webrender(traversal,
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api,
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pipeline_id,
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epoch,
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scroll_layer_id,
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builder,
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true);
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}
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}
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while let Some(item) = traversal.advance(self) {
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item.item.convert_to_webrender(webrender_traits::StackingLevel::PositionedContent,
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builder);
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}
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}
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fn convert_to_webrender<'a>(&self,
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traversal: &mut DisplayListTraversal<'a>,
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api: &webrender_traits::RenderApi,
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pipeline_id: webrender_traits::PipelineId,
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epoch: webrender_traits::Epoch,
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scroll_layer_id: Option<webrender_traits::ScrollLayerId>)
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-> webrender_traits::StackingContextId {
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let scroll_policy = self.layer_info
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.map_or(webrender_traits::ScrollPolicy::Scrollable, |info| {
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@ -259,80 +331,50 @@ impl WebRenderStackingContextConverter for StackingContext {
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self.establishes_3d_context,
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self.blend_mode.to_blend_mode(),
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self.filters.to_filter_ops());
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let dl_builder = self.display_list.convert_to_webrender(api,
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pipeline_id,
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epoch);
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api.add_display_list(dl_builder, &mut sc, pipeline_id, epoch);
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let mut builder = webrender_traits::DisplayListBuilder::new();
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self.convert_children_to_webrender(traversal,
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api,
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pipeline_id,
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epoch,
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scroll_layer_id,
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&mut builder,
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false);
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api.add_display_list(builder, &mut sc, pipeline_id, epoch);
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api.add_stacking_context(sc, pipeline_id, epoch)
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}
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fn web_render_stacking_level(&self) -> webrender_traits::StackingLevel {
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match self.context_type {
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StackingContextType::Real | StackingContextType::PseudoPositioned =>
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webrender_traits::StackingLevel::PositionedContent,
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StackingContextType::PseudoFloat => webrender_traits::StackingLevel::Floats,
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}
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}
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}
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impl WebRenderDisplayListConverter for Box<DisplayList> {
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impl WebRenderDisplayListConverter for DisplayList {
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fn convert_to_webrender(&self,
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api: &webrender_traits::RenderApi,
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pipeline_id: webrender_traits::PipelineId,
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epoch: webrender_traits::Epoch) -> webrender_traits::DisplayListBuilder {
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let mut builder = webrender_traits::DisplayListBuilder::new();
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epoch: webrender_traits::Epoch,
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scroll_layer_id: Option<webrender_traits::ScrollLayerId>)
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-> webrender_traits::StackingContextId {
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let mut traversal = DisplayListTraversal {
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display_list: self,
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current_item_index: 0,
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last_item_index: self.list.len() - 1,
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};
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for item in &self.background_and_borders {
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item.convert_to_webrender(api,
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pipeline_id,
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epoch,
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webrender_traits::StackingLevel::BackgroundAndBorders,
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&mut builder);
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}
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for item in &self.block_backgrounds_and_borders {
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item.convert_to_webrender(api,
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pipeline_id,
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epoch,
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webrender_traits::StackingLevel::BlockBackgroundAndBorders,
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&mut builder);
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}
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for item in &self.floats {
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item.convert_to_webrender(api,
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pipeline_id,
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epoch,
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webrender_traits::StackingLevel::Floats,
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&mut builder);
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}
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for item in &self.content {
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item.convert_to_webrender(api,
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pipeline_id,
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epoch,
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webrender_traits::StackingLevel::Content,
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&mut builder);
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}
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for item in &self.positioned_content {
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item.convert_to_webrender(api,
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pipeline_id,
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epoch,
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webrender_traits::StackingLevel::PositionedContent,
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&mut builder);
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}
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for item in &self.outlines {
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item.convert_to_webrender(api,
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pipeline_id,
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epoch,
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webrender_traits::StackingLevel::Outlines,
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&mut builder);
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}
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builder
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self.root_stacking_context.convert_to_webrender(&mut traversal,
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api,
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pipeline_id,
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epoch,
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scroll_layer_id)
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}
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}
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impl WebRenderDisplayItemConverter for DisplayItem {
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fn convert_to_webrender(&self,
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api: &webrender_traits::RenderApi,
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pipeline_id: webrender_traits::PipelineId,
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epoch: webrender_traits::Epoch,
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level: webrender_traits::StackingLevel,
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builder: &mut webrender_traits::DisplayListBuilder) {
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match *self {
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@ -469,13 +511,6 @@ impl WebRenderDisplayItemConverter for DisplayItem {
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item.base.clip.to_clip_region(),
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pipeline_id);
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}
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DisplayItem::StackingContextClass(ref item) => {
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let stacking_context_id = item.convert_to_webrender(api,
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pipeline_id,
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epoch,
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None);
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builder.push_stacking_context(level, stacking_context_id);
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}
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}
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}
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}
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