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gfx: Don't mutate the same point multiple times while translating it to other stacking context space.

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I don't know how neither review or a test caught this.
This commit is contained in:
Emilio Cobos Álvarez 2017-01-16 14:28:04 +01:00
parent 9cd1b861ec
commit 602b45a372
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4 changed files with 43 additions and 8 deletions
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14
components/gfx/display_list/mod.rs
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@ -115,7 +115,7 @@ impl DisplayList {
// Return all nodes containing the point of interest, bottommost first, and
// respecting the `pointer-events` CSS property.
pub fn hit_test(&self,
translated_point: &mut Point2D<Au>,
translated_point: &Point2D<Au>,
client_point: &Point2D<Au>,
scroll_offsets: &ScrollOffsetMap)
-> Vec<DisplayItemMetadata> {
@ -131,28 +131,30 @@ impl DisplayList {
pub fn hit_test_contents<'a>(&self,
traversal: &mut DisplayListTraversal<'a>,
translated_point: &mut Point2D<Au>,
translated_point: &Point2D<Au>,
client_point: &Point2D<Au>,
scroll_offsets: &ScrollOffsetMap,
result: &mut Vec<DisplayItemMetadata>) {
while let Some(item) = traversal.next() {
match item {
&DisplayItem::PushStackingContext(ref stacking_context_item) => {
let mut point = *translated_point;
DisplayList::translate_point(&stacking_context_item.stacking_context,
translated_point,
&mut point,
client_point);
self.hit_test_contents(traversal,
translated_point,
&point,
client_point,
scroll_offsets,
result);
}
&DisplayItem::PushScrollRoot(ref item) => {
let mut point = *translated_point;
DisplayList::scroll_root(&item.scroll_root,
translated_point,
&mut point,
scroll_offsets);
self.hit_test_contents(traversal,
translated_point,
&point,
client_point,
scroll_offsets,
result);