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optimize moving tiles to front/back a bit

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First i thought this would fix the bug fixed in the prev. commit,
but it was unrelated.
Now that i've changed it and made it more readable, may as well keep it.
This commit is contained in:
fgenesis 2024-07-13 06:47:07 +02:00
parent 2f47d11271
commit 1573eea051
1 changed files with 18 additions and 10 deletions
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28
BBGE/Tile.cpp
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@ -94,21 +94,29 @@ void TileStorage::_moveToBack(size_t *indices, size_t n)
void TileStorage::_moveToPos(MoveTarget where, size_t * indices, size_t n)
{
std::vector<size_t> tmp(indices, indices + n);
std::vector<TileData> tt(n);
const size_t N = tiles.size();
std::vector<TileData> tt;
tt.reserve(N);
std::vector<unsigned char> used(N, 0);
// unsorted indices -> preserve relative order of tiles
for(size_t i = 0; i < n; ++i)
tt[i] = tiles[tmp[i]];
used[indices[i]] = 1;
std::sort(tmp.begin(), tmp.end());
if(where == MV_BEGIN)
for(size_t i = 0; i < n; ++i)
tt.push_back(tiles[indices[i]]);
// SORTED indices, erasing from the BACK -> we don't get a destructive index shift
for(size_t i = n; i --> 0; )
tiles.erase(tiles.begin() + tmp[i]);
for(size_t i = 0; i < N; ++i)
if(!used[i])
tt.push_back(tiles[i]);
size_t offs = where == MV_BEGIN ? 0 : tiles.size();
tiles.insert(tiles.begin() + offs, tt.begin(), tt.end());
if(where == MV_END)
for(size_t i = 0; i < n; ++i)
tt.push_back(tiles[indices[i]]);
tiles.swap(tt);
size_t offs = where == MV_BEGIN ? 0 : tiles.size() - n;
for(size_t i = 0; i < n; ++i)
indices[i] = i + offs;