1 files changed, 364 insertions, 0 deletions
diff --git a/gfx/wr/webrender/src/scene.rs b/gfx/wr/webrender/src/scene.rs
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+++ b/gfx/wr/webrender/src/scene.rs
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use api::{BuiltDisplayList, DisplayListWithCache, ColorF, DynamicProperties, Epoch, FontRenderMode};
+use api::{PipelineId, PropertyBinding, PropertyBindingId, PropertyValue, MixBlendMode, StackingContext};
+use api::units::*;
+use malloc_size_of::{MallocSizeOf, MallocSizeOfOps};
+use crate::render_api::MemoryReport;
+use crate::composite::CompositorKind;
+use crate::clip::{ClipStore, ClipTree};
+use crate::spatial_tree::SpatialTree;
+use crate::frame_builder::{FrameBuilderConfig};
+use crate::hit_test::{HitTester, HitTestingScene, HitTestingSceneStats};
+use crate::internal_types::FastHashMap;
+use crate::picture::SurfaceInfo;
+use crate::picture_graph::PictureGraph;
+use crate::prim_store::{PrimitiveStore, PrimitiveStoreStats, PictureIndex, PrimitiveInstance};
+use crate::tile_cache::TileCacheConfig;
+use std::sync::Arc;
+
+/// Stores a map of the animated property bindings for the current display list. These
+/// can be used to animate the transform and/or opacity of a display list without
+/// re-submitting the display list itself.
+#[cfg_attr(feature = "capture", derive(Serialize))]
+#[cfg_attr(feature = "replay", derive(Deserialize))]
+pub struct SceneProperties {
+    transform_properties: FastHashMap<PropertyBindingId, LayoutTransform>,
+    float_properties: FastHashMap<PropertyBindingId, f32>,
+    color_properties: FastHashMap<PropertyBindingId, ColorF>,
+    current_properties: DynamicProperties,
+    pending_properties: Option<DynamicProperties>,
+}
+
+impl SceneProperties {
+    pub fn new() -> Self {
+        SceneProperties {
+            transform_properties: FastHashMap::default(),
+            float_properties: FastHashMap::default(),
+            color_properties: FastHashMap::default(),
+            current_properties: DynamicProperties::default(),
+            pending_properties: None,
+        }
+    }
+
+    /// Reset the pending properties without flush.
+    pub fn reset_properties(&mut self) {
+        self.pending_properties = None;
+    }
+
+    /// Add to the current property list for this display list.
+    pub fn add_properties(&mut self, properties: DynamicProperties) {
+        let mut pending_properties = self.pending_properties
+            .take()
+            .unwrap_or_default();
+
+        pending_properties.extend(properties);
+
+        self.pending_properties = Some(pending_properties);
+    }
+
+    /// Add to the current transform property list for this display list.
+    pub fn add_transforms(&mut self, transforms: Vec<PropertyValue<LayoutTransform>>) {
+        let mut pending_properties = self.pending_properties
+            .take()
+            .unwrap_or_default();
+
+        pending_properties.transforms.extend(transforms);
+
+        self.pending_properties = Some(pending_properties);
+    }
+
+    /// Flush any pending updates to the scene properties. Returns
+    /// true if the properties have changed since the last flush
+    /// was called. This code allows properties to be changed by
+    /// multiple reset_properties, add_properties and add_transforms calls
+    /// during a single transaction, and still correctly determine if any
+    /// properties have changed. This can have significant power
+    /// saving implications, allowing a frame build to be skipped
+    /// if the properties haven't changed in many cases.
+    pub fn flush_pending_updates(&mut self) -> bool {
+        let mut properties_changed = false;
+
+        if let Some(ref pending_properties) = self.pending_properties {
+            if *pending_properties != self.current_properties {
+                self.transform_properties.clear();
+                self.float_properties.clear();
+                self.color_properties.clear();
+
+                for property in &pending_properties.transforms {
+                    self.transform_properties
+                        .insert(property.key.id, property.value);
+                }
+
+                for property in &pending_properties.floats {
+                    self.float_properties
+                        .insert(property.key.id, property.value);
+                }
+
+                for property in &pending_properties.colors {
+                    self.color_properties
+                        .insert(property.key.id, property.value);
+                }
+
+                self.current_properties = pending_properties.clone();
+                properties_changed = true;
+            }
+        }
+
+        properties_changed
+    }
+
+    /// Get the current value for a transform property.
+    pub fn resolve_layout_transform(
+        &self,
+        property: &PropertyBinding<LayoutTransform>,
+    ) -> LayoutTransform {
+        match *property {
+            PropertyBinding::Value(value) => value,
+            PropertyBinding::Binding(ref key, v) => {
+                self.transform_properties
+                    .get(&key.id)
+                    .cloned()
+                    .unwrap_or(v)
+            }
+        }
+    }
+
+    /// Get the current value for a float property.
+    pub fn resolve_float(
+        &self,
+        property: &PropertyBinding<f32>
+    ) -> f32 {
+        match *property {
+            PropertyBinding::Value(value) => value,
+            PropertyBinding::Binding(ref key, v) => {
+                self.float_properties
+                    .get(&key.id)
+                    .cloned()
+                    .unwrap_or(v)
+            }
+        }
+    }
+
+    pub fn float_properties(&self) -> &FastHashMap<PropertyBindingId, f32> {
+        &self.float_properties
+    }
+
+    /// Get the current value for a color property.
+    pub fn resolve_color(
+        &self,
+        property: &PropertyBinding<ColorF>
+    ) -> ColorF {
+        match *property {
+            PropertyBinding::Value(value) => value,
+            PropertyBinding::Binding(ref key, v) => {
+                self.color_properties
+                    .get(&key.id)
+                    .cloned()
+                    .unwrap_or(v)
+            }
+        }
+    }
+
+    pub fn color_properties(&self) -> &FastHashMap<PropertyBindingId, ColorF> {
+        &self.color_properties
+    }
+
+}
+
+/// A representation of the layout within the display port for a given document or iframe.
+#[cfg_attr(feature = "capture", derive(Serialize))]
+#[cfg_attr(feature = "replay", derive(Deserialize))]
+#[derive(Clone)]
+pub struct ScenePipeline {
+    pub display_list: DisplayListWithCache,
+}
+
+/// A complete representation of the layout bundling visible pipelines together.
+#[cfg_attr(feature = "capture", derive(Serialize))]
+#[cfg_attr(feature = "replay", derive(Deserialize))]
+#[derive(Clone)]
+pub struct Scene {
+    pub root_pipeline_id: Option<PipelineId>,
+    pub pipelines: FastHashMap<PipelineId, ScenePipeline>,
+    pub pipeline_epochs: FastHashMap<PipelineId, Epoch>,
+}
+
+impl Scene {
+    pub fn new() -> Self {
+        Scene {
+            root_pipeline_id: None,
+            pipelines: FastHashMap::default(),
+            pipeline_epochs: FastHashMap::default(),
+        }
+    }
+
+    pub fn set_root_pipeline_id(&mut self, pipeline_id: PipelineId) {
+        self.root_pipeline_id = Some(pipeline_id);
+    }
+
+    pub fn set_display_list(
+        &mut self,
+        pipeline_id: PipelineId,
+        epoch: Epoch,
+        display_list: BuiltDisplayList,
+    ) {
+        // Adds a cache to the given display list. If this pipeline already had
+        // a display list before, that display list is updated and used instead.
+        let display_list = match self.pipelines.remove(&pipeline_id) {
+            Some(mut pipeline) => {
+                pipeline.display_list.update(display_list);
+                pipeline.display_list
+            }
+            None => DisplayListWithCache::new_from_list(display_list)
+        };
+
+        let new_pipeline = ScenePipeline {
+            display_list,
+        };
+
+        self.pipelines.insert(pipeline_id, new_pipeline);
+        self.pipeline_epochs.insert(pipeline_id, epoch);
+    }
+
+    pub fn remove_pipeline(&mut self, pipeline_id: PipelineId) {
+        if self.root_pipeline_id == Some(pipeline_id) {
+            self.root_pipeline_id = None;
+        }
+        self.pipelines.remove(&pipeline_id);
+        self.pipeline_epochs.remove(&pipeline_id);
+    }
+
+    pub fn update_epoch(&mut self, pipeline_id: PipelineId, epoch: Epoch) {
+        self.pipeline_epochs.insert(pipeline_id, epoch);
+    }
+
+    pub fn has_root_pipeline(&self) -> bool {
+        if let Some(ref root_id) = self.root_pipeline_id {
+            return self.pipelines.contains_key(root_id);
+        }
+
+        false
+    }
+
+    pub fn report_memory(
+        &self,
+        ops: &mut MallocSizeOfOps,
+        report: &mut MemoryReport
+    ) {
+        for (_, pipeline) in &self.pipelines {
+            report.display_list += pipeline.display_list.size_of(ops)
+        }
+    }
+}
+
+pub trait StackingContextHelpers {
+    fn mix_blend_mode_for_compositing(&self) -> Option<MixBlendMode>;
+}
+
+impl StackingContextHelpers for StackingContext {
+    fn mix_blend_mode_for_compositing(&self) -> Option<MixBlendMode> {
+        match self.mix_blend_mode {
+            MixBlendMode::Normal => None,
+            _ => Some(self.mix_blend_mode),
+        }
+    }
+}
+
+
+/// WebRender's internal representation of the scene.
+pub struct BuiltScene {
+    pub has_root_pipeline: bool,
+    pub pipeline_epochs: FastHashMap<PipelineId, Epoch>,
+    pub output_rect: DeviceIntRect,
+    pub prim_store: PrimitiveStore,
+    pub clip_store: ClipStore,
+    pub config: FrameBuilderConfig,
+    pub hit_testing_scene: Arc<HitTestingScene>,
+    pub tile_cache_config: TileCacheConfig,
+    pub tile_cache_pictures: Vec<PictureIndex>,
+    pub picture_graph: PictureGraph,
+    pub num_plane_splitters: usize,
+    pub prim_instances: Vec<PrimitiveInstance>,
+    pub surfaces: Vec<SurfaceInfo>,
+    pub clip_tree: ClipTree,
+}
+
+impl BuiltScene {
+    pub fn empty() -> Self {
+        BuiltScene {
+            has_root_pipeline: false,
+            pipeline_epochs: FastHashMap::default(),
+            output_rect: DeviceIntRect::zero(),
+            prim_store: PrimitiveStore::new(&PrimitiveStoreStats::empty()),
+            clip_store: ClipStore::new(),
+            hit_testing_scene: Arc::new(HitTestingScene::new(&HitTestingSceneStats::empty())),
+            tile_cache_config: TileCacheConfig::new(0),
+            tile_cache_pictures: Vec::new(),
+            picture_graph: PictureGraph::new(),
+            num_plane_splitters: 0,
+            prim_instances: Vec::new(),
+            surfaces: Vec::new(),
+            clip_tree: ClipTree::new(),
+            config: FrameBuilderConfig {
+                default_font_render_mode: FontRenderMode::Mono,
+                dual_source_blending_is_supported: false,
+                testing: false,
+                gpu_supports_fast_clears: false,
+                gpu_supports_advanced_blend: false,
+                advanced_blend_is_coherent: false,
+                gpu_supports_render_target_partial_update: true,
+                external_images_require_copy: false,
+                batch_lookback_count: 0,
+                background_color: None,
+                compositor_kind: CompositorKind::default(),
+                tile_size_override: None,
+                max_surface_override: None,
+                max_depth_ids: 0,
+                max_target_size: 0,
+                force_invalidation: false,
+                is_software: false,
+                low_quality_pinch_zoom: false,
+                max_shared_surface_size: 2048,
+            },
+        }
+    }
+
+    /// Get the memory usage statistics to pre-allocate for the next scene.
+    pub fn get_stats(&self) -> SceneStats {
+        SceneStats {
+            prim_store_stats: self.prim_store.get_stats(),
+            hit_test_stats: self.hit_testing_scene.get_stats(),
+        }
+    }
+
+    pub fn create_hit_tester(
+        &mut self,
+        spatial_tree: &SpatialTree,
+    ) -> HitTester {
+        HitTester::new(
+            Arc::clone(&self.hit_testing_scene),
+            spatial_tree,
+        )
+    }
+}
+
+/// Stores the allocation sizes of various arrays in the built
+/// scene. This is retrieved from the current frame builder
+/// and used to reserve an approximately correct capacity of
+/// the arrays for the next scene that is getting built.
+pub struct SceneStats {
+    pub prim_store_stats: PrimitiveStoreStats,
+    pub hit_test_stats: HitTestingSceneStats,
+}
+
+impl SceneStats {
+    pub fn empty() -> Self {
+        SceneStats {
+            prim_store_stats: PrimitiveStoreStats::empty(),
+            hit_test_stats: HitTestingSceneStats::empty(),
+        }
+    }
+}