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Optimize performance. (#189)

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Screen::ApplyShader accounted for 60% of the computation. This patch
optimize it.
Performance on a 80x80 frame improved from 1400 draw/s to 7000 draw/s.
This commit is contained in:
Arthur Sonzogni
2021-08-13 00:11:52 +02:00
committed by GitHub
parent 70cf088d6a
commit 69b0c9e53e
1 changed files with 20 additions and 13 deletions
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21
src/ftxui/screen/screen.cpp
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@@ -227,23 +227,30 @@ void Screen::ApplyShader() {
// Merge box characters togethers.
for (int y = 1; y < dimy_; ++y) {
for (int x = 1; x < dimx_; ++x) {
std::string& left = at(x - 1, y);
std::string& top = at(x, y - 1);
std::string& cur = at(x, y);
// Box drawing character uses exactly 3 byte.
std::string& cur = pixels_[y][x].character;
if (cur.size() != 3u)
continue;
// Left vs current
// Left vs current.
std::string& left = pixels_[y][x-1].character;
if (left.size() == 3u) {
if (cur == "│" && left == "─") cur = "┤";
if (cur == "─" && left == "│") left = "├";
if (cur == "├" && left == "─") cur = "┼";
if (cur == "─" && left == "│") left = "├";
if (cur == "─" && left == "┤") left = "┼";
}
// Top vs current
// Top vs current.
std::string& top = pixels_[y-1][x].character;
if (top.size() == 3u) {
if (cur == "─" && top == "│") cur = "┴";
if (cur == "│" && top == "─") top = "┬";
if (cur == "┬" && top == "│") cur = "┼";
if (cur == "│" && top == "─") top = "┬";
if (cur == "│" && top == "┴") top = "┼";
}
}
}
}
// clang-format on