Reduce the number of added/removed lines when redrawing screen
This should reduce flickering.
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parent
0506de8443
commit
68f0bcce7c
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@ -189,37 +189,50 @@ void TerminalUI::Screen::output(bool force)
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}
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};
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struct Add { int pos; int len; };
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Vector<Add> adds;
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struct Change { int pos; int add; int del; };
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Vector<Change> changes{Change{}};
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auto new_hashes = lines | transform([](auto& line) { return hash_value(line.atoms); }) | gather<Vector>();
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for_each_diff(hashes.begin(), hashes.size(),
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new_hashes.begin(), new_hashes.size(),
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[&, line=0, posB=0](DiffOp op, int len) mutable {
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[&, pos=0](DiffOp op, int len) mutable {
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switch (op)
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{
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case DiffOp::Keep:
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line += len;
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posB += len;
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pos += len;
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if (changes.back().add != 0 || changes.back().del != 0)
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changes.push_back({pos, 0, 0});
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break;
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case DiffOp::Add:
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adds.push_back({posB, len});
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posB += len;
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if (changes.back().add == 0)
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changes.back().pos = pos;
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changes.back().add += len;
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pos += len;
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break;
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case DiffOp::Remove:
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printf("\033[%dH\033[%dM", line+1, len);
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changes.back().del += len;
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break;
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}
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});
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hashes = std::move(new_hashes);
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for (auto& add : adds)
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int added = 0;
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for (auto& change : changes)
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{
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printf("\033[%dH\033[%dL", add.pos + 1, add.len);
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for (int i = 0; i < add.len; ++i)
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if (change.del > change.add)
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printf("\033[%dH\033[%dM", change.pos - added + 1, change.del - change.add);
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added += change.add;
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}
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for (auto& change : changes)
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{
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if (i != 0)
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printf("\033[%dH", add.pos + i + 1);
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for (auto& atom : lines[add.pos + i].atoms)
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for (int i = 0; i < change.add; ++i)
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{
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if (i == 0 and change.add > change.del)
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printf("\033[%dH\033[%dL", change.pos + 1, change.add - change.del);
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else
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printf("\033[%dH", change.pos + i + 1);
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for (auto& atom : lines[change.pos + i].atoms)
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{
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fputs("\033[", stdout);
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set_attributes(atom.face.attributes);
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