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Store hit testing information in a data structure that sits alongside the display list in the compositor. This will allow the compositor to store more information per-node. The data structure also takes care of de-duplicating information between successive display list entries. In the future, the data structure can be even more aggressive in producing smaller side hit testing lists, if necessary.
44 lines
1.6 KiB
Rust
44 lines
1.6 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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//! Defines data structures which are consumed by the Compositor.
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use embedder_traits::Cursor;
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/// Information that Servo keeps alongside WebRender display items
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/// in order to add more context to hit test results.
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#[derive(Debug, Deserialize, Serialize)]
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pub struct HitTestInfo {
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/// The id of the node of this hit test item.
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pub node: u64,
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/// The cursor of this node's hit test item.
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pub cursor: Option<Cursor>,
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}
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/// A data structure which stores compositor-side information about
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/// display lists sent to the compositor.
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/// by a WebRender display list.
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#[derive(Debug, Default, Deserialize, Serialize)]
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pub struct CompositorDisplayListInfo {
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/// An array of `HitTestInfo` which is used to store information
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/// to assist the compositor to take various actions (set the cursor,
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/// scroll without layout) using a WebRender hit test result.
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pub hit_test_info: Vec<HitTestInfo>,
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}
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impl CompositorDisplayListInfo {
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/// Add or re-use a duplicate HitTestInfo entry in this `CompositorHitTestInfo`
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/// and return the index.
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pub fn add_hit_test_info(&mut self, node: u64, cursor: Option<Cursor>) -> usize {
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if let Some(last) = self.hit_test_info.last() {
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if node == last.node && cursor == last.cursor {
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return self.hit_test_info.len() - 1;
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}
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}
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self.hit_test_info.push(HitTestInfo { node, cursor });
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self.hit_test_info.len() - 1
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}
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}
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