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Integrate Canvas into the DisplayList
Canvas is currently given a layer at the stacking context level. Instead it's DisplayItem should be given a layer directly. This fixes painting order issues where canvases are painted on top of other positioned content that is later in tree order. It always simplifies the code a bit.
This commit is contained in:
Martin Robinson
parent
11d23a41b3
commit
30ba65b360
5 changed files with 83 additions and 74 deletions
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@ -245,6 +245,7 @@ pub trait FragmentDisplayListBuilding {
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/// A helper method that `build_display_list` calls to create per-fragment-type display items.
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fn build_fragment_type_specific_display_items(&mut self,
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display_list: &mut DisplayList,
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layout_context: &LayoutContext,
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stacking_relative_border_box: &Rect<Au>,
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clip: &ClippingRegion);
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@ -252,7 +253,6 @@ pub trait FragmentDisplayListBuilding {
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fn create_stacking_context(&self,
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base_flow: &BaseFlow,
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display_list: Box<DisplayList>,
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layout_context: &LayoutContext,
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scroll_policy: ScrollPolicy,
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mode: StackingContextCreationMode)
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-> Arc<StackingContext>;
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@ -1042,6 +1042,7 @@ impl FragmentDisplayListBuilding for Fragment {
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// Create special per-fragment-type display items.
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self.build_fragment_type_specific_display_items(display_list,
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layout_context,
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&stacking_relative_border_box,
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&clip);
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@ -1054,6 +1055,7 @@ impl FragmentDisplayListBuilding for Fragment {
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fn build_fragment_type_specific_display_items(&mut self,
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display_list: &mut DisplayList,
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layout_context: &LayoutContext,
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stacking_relative_border_box: &Rect<Au>,
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clip: &ClippingRegion) {
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// Compute the context box position relative to the parent stacking context.
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@ -1154,30 +1156,48 @@ impl FragmentDisplayListBuilding for Fragment {
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.computed_inline_size.map_or(0, |w| w.to_px() as usize);
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let height = canvas_fragment_info.replaced_image_fragment_info
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.computed_block_size.map_or(0, |h| h.to_px() as usize);
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let (sender, receiver) = ipc::channel::<IpcSharedMemory>().unwrap();
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let canvas_data = match canvas_fragment_info.ipc_renderer {
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Some(ref ipc_renderer) => {
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ipc_renderer.lock().unwrap().send(CanvasMsg::FromLayout(
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if width > 0 && height > 0 {
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let (sender, receiver) = ipc::channel::<IpcSharedMemory>().unwrap();
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let layer_id = self.layer_id();
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let canvas_data = match canvas_fragment_info.ipc_renderer {
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Some(ref ipc_renderer) => {
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let ipc_renderer = ipc_renderer.lock().unwrap();
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ipc_renderer.send(CanvasMsg::FromLayout(
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FromLayoutMsg::SendPixelContents(sender))).unwrap();
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receiver.recv().unwrap()
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},
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None => IpcSharedMemory::from_byte(0xFFu8, width * height * 4),
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};
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display_list.content.push_back(DisplayItem::ImageClass(box ImageDisplayItem {
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base: BaseDisplayItem::new(stacking_relative_content_box,
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DisplayItemMetadata::new(self.node,
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&*self.style,
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Cursor::DefaultCursor),
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(*clip).clone()),
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image: Arc::new(Image {
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width: width as u32,
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height: height as u32,
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format: PixelFormat::RGBA8,
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bytes: canvas_data,
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}),
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stretch_size: stacking_relative_content_box.size,
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image_rendering: image_rendering::T::Auto,
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}));
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let data = receiver.recv().unwrap();
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// Propagate the layer and the renderer to the paint task.
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layout_context.shared.canvas_layers_sender.send(
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(layer_id, (*ipc_renderer).clone())).unwrap();
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data
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},
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None => IpcSharedMemory::from_byte(0xFFu8, width * height * 4),
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};
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let display_item = DisplayItem::ImageClass(box ImageDisplayItem {
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base: BaseDisplayItem::new(stacking_relative_content_box,
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DisplayItemMetadata::new(self.node,
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&*self.style,
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Cursor::DefaultCursor),
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(*clip).clone()),
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image: Arc::new(Image {
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width: width as u32,
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height: height as u32,
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format: PixelFormat::RGBA8,
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bytes: canvas_data,
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}),
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stretch_size: stacking_relative_content_box.size,
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image_rendering: image_rendering::T::Auto,
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});
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display_list.content.push_back(DisplayItem::LayeredItemClass(box LayeredItem {
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item: display_item,
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layer_id: layer_id
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}));
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display_list.layer_info.push_back(
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LayerInfo::new(layer_id, ScrollPolicy::Scrollable, None));
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}
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}
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SpecificFragmentInfo::UnscannedText(_) => {
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panic!("Shouldn't see unscanned fragments here.")
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@ -1191,7 +1211,6 @@ impl FragmentDisplayListBuilding for Fragment {
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fn create_stacking_context(&self,
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base_flow: &BaseFlow,
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display_list: Box<DisplayList>,
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layout_context: &LayoutContext,
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scroll_policy: ScrollPolicy,
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mode: StackingContextCreationMode)
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-> Arc<StackingContext> {
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@ -1305,32 +1324,16 @@ impl FragmentDisplayListBuilding for Fragment {
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filters.push(Filter::Opacity(effects.opacity))
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}
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let canvas = match self.specific {
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SpecificFragmentInfo::Canvas(_) => true,
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_ => false
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};
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// There are three situations that need layers: when the fragment has the HAS_LAYER
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// flag, when this is a canvas or iframe fragment, and when we are building a layer
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// tree for overflow scrolling.
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// There are two situations that need layers: when the fragment has the HAS_LAYER
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// flag and when we are building a layer tree for overflow scrolling.
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let layer_info = if mode == StackingContextCreationMode::InnerScrollWrapper {
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Some(LayerInfo::new(self.layer_id_for_overflow_scroll(), scroll_policy, None))
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} else if self.flags.contains(HAS_LAYER) || canvas {
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} else if self.flags.contains(HAS_LAYER) {
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Some(LayerInfo::new(self.layer_id(), scroll_policy, None))
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} else {
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None
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};
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// If it's a canvas we must propagate the layer and the renderer to the paint task.
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if let SpecificFragmentInfo::Canvas(ref fragment_info) = self.specific {
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let layer_id = layer_info.unwrap().layer_id;
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if let Some(ref ipc_renderer) = fragment_info.ipc_renderer {
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layout_context.shared
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.canvas_layers_sender
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.send((layer_id, (*ipc_renderer.lock().unwrap()).clone())).unwrap();
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}
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}
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let scrolls_overflow_area = mode == StackingContextCreationMode::OuterScrollWrapper;
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let transform_style = self.style().get_used_transform_style();
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let establishes_3d_context = scrolls_overflow_area ||
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@ -1603,7 +1606,6 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
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self.fragment.create_stacking_context(
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&self.base,
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display_list,
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layout_context,
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scroll_policy,
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StackingContextCreationMode::Normal))
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} else {
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@ -1685,13 +1687,11 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
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outer_display_list.children.push_back(self.fragment.create_stacking_context(
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&self.base,
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display_list,
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layout_context,
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scroll_policy,
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StackingContextCreationMode::InnerScrollWrapper));
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self.fragment.create_stacking_context(
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&self.base,
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outer_display_list,
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layout_context,
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scroll_policy,
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StackingContextCreationMode::OuterScrollWrapper)
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}
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@ -1699,7 +1699,6 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
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self.fragment.create_stacking_context(
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&self.base,
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display_list,
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layout_context,
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scroll_policy,
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StackingContextCreationMode::Normal)
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}
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@ -1723,7 +1722,6 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
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DisplayListBuildingResult::StackingContext(
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self.fragment.create_stacking_context(&self.base,
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display_list,
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layout_context,
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ScrollPolicy::Scrollable,
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StackingContextCreationMode::Normal))
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} else {
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@ -1830,7 +1828,6 @@ impl InlineFlowDisplayListBuilding for InlineFlow {
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self.fragments.fragments[0].create_stacking_context(
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&self.base,
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display_list,
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layout_context,
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ScrollPolicy::Scrollable,
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StackingContextCreationMode::Normal))
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} else {
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