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LibGfx: Small improvement for DisjointRectSet::shatter

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This avoids a call to clone() which would be discarded immediately.
Also, avoid essentially cloning for each hammer rectangle unless
there is actually a need for it.
This commit is contained in:
Tom 2020-08-18 16:25:58 -06:00 • committed by Andreas Kling
parent 983f4f935c
commit 5cd2a37079
1 changed files with 7 additions and 4 deletions
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11
Libraries/LibGfx/DisjointRectSet.cpp
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@ -173,10 +173,13 @@ DisjointRectSet DisjointRectSet::shatter(const DisjointRectSet& hammer) const
return clone();
// TODO: This could use some optimization
auto shards = clone();
for (auto& hammer_rect : hammer.m_rects) {
auto shattered = shards.shatter(hammer_rect);
shards = move(shattered);
DisjointRectSet shards = shatter(hammer.m_rects[0]);
auto rects_count = hammer.m_rects.size();
for (size_t i = 1; i < rects_count && !shards.is_empty(); i++) {
if (hammer.m_rects[i].intersects(shards.m_rects)) {
auto shattered = shards.shatter(hammer.m_rects[i]);
shards = move(shattered);
}
}
// Since there should be no overlaps, we don't need to call shatter()
return shards;