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Have PaintLayers own StackingContexts instead of the opposite
Previously, StackingContexts might have a PaintLayer. We switch the ownership, for several reasons: * We want PaintLayers to potentially contain something other than a StackingContext soon. * We want to delay the creation of PaintLayers until the last minute, so that we can synthesize new layers for sandwiched content. This commit also implements the second goal. Instead of creating PaintLayers during layout itself, wait until we are sorting and layerizing a completed DisplayList.
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6 changed files with 198 additions and 161 deletions
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@ -35,7 +35,7 @@ impl FrameTreeId {
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}
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}
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#[derive(Clone, PartialEq, Eq, Copy, Hash, Deserialize, Serialize)]
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#[derive(Clone, PartialEq, Eq, Copy, Hash, Deserialize, Serialize, HeapSizeOf)]
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pub struct LayerId(pub usize, pub u32);
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impl Debug for LayerId {
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@ -59,7 +59,7 @@ pub enum LayerKind {
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}
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/// The scrolling policy of a layer.
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#[derive(Clone, PartialEq, Eq, Copy, Deserialize, Serialize, Debug)]
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#[derive(Clone, PartialEq, Eq, Copy, Deserialize, Serialize, Debug, HeapSizeOf)]
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pub enum ScrollPolicy {
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/// These layers scroll when the parent receives a scrolling message.
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Scrollable,
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