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cache the localtime result in the message

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localtime uses global state AND spams allocations like cazy
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Green Sky 2024-03-12 18:04:02 +01:00
parent aaf8c6adc1
commit 719400068a
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1 changed files with 37 additions and 17 deletions
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46
src/chat_gui4.cpp
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@ -35,6 +35,16 @@ namespace Components {
float fade {1.f};
};
struct ConvertedTimeCache {
// calling localtime is expensive af
int tm_year {0};
int tm_yday {0};
int tm_mon {0};
int tm_mday {0};
int tm_hour {0};
int tm_min {0};
};
} // Components
static constexpr float lerp(float a, float b, float t) {
@ -324,7 +334,8 @@ float ChatGui4::render(float time_delta) {
//tmp_view.use<Message::Components::Timestamp>();
//tmp_view.each([&](const Message3 e, Message::Components::ContactFrom& c_from, Message::Components::ContactTo& c_to, Message::Components::Timestamp ts
//) {
uint64_t prev_ts {0};
//uint64_t prev_ts {0};
Components::ConvertedTimeCache prev_time {};
auto tmp_view = msg_reg.view<Message::Components::Timestamp>();
for (auto view_it = tmp_view.rbegin(), view_last = tmp_view.rend(); view_it != view_last; view_it++) {
const Message3 e = *view_it;
@ -342,15 +353,12 @@ float ChatGui4::render(float time_delta) {
// TODO: why?
ImGui::TableNextRow(0, TEXT_BASE_HEIGHT);
{ // check if date changed
// TODO: find defined ways of casting to time_t
std::time_t prev = prev_ts / 1000;
std::time_t next = ts.ts / 1000;
std::tm prev_tm = *std::localtime(&prev);
std::tm next_tm = *std::localtime(&next);
if (msg_reg.all_of<Components::ConvertedTimeCache>(e)) { // check if date changed
// TODO: move conversion up?
const auto& next_time = msg_reg.get<Components::ConvertedTimeCache>(e);
if (
prev_tm.tm_yday != next_tm.tm_yday ||
prev_tm.tm_year != next_tm.tm_year // making sure
prev_time.tm_yday != next_time.tm_yday ||
prev_time.tm_year != next_time.tm_year // making sure
) {
// name
if (ImGui::TableNextColumn()) {
@ -359,14 +367,14 @@ float ChatGui4::render(float time_delta) {
// msg
if (ImGui::TableNextColumn()) {
ImGui::TextDisabled("DATE CHANGED from %d.%d.%d to %d.%d.%d",
1900+prev_tm.tm_year, 1+prev_tm.tm_mon, prev_tm.tm_mday,
1900+next_tm.tm_year, 1+next_tm.tm_mon, next_tm.tm_mday
1900+prev_time.tm_year, 1+prev_time.tm_mon, prev_time.tm_mday,
1900+next_time.tm_year, 1+next_time.tm_mon, next_time.tm_mday
);
}
ImGui::TableNextRow(0, TEXT_BASE_HEIGHT);
}
prev_ts = ts.ts;
prev_time = next_time;
}
@ -519,12 +527,24 @@ float ChatGui4::render(float time_delta) {
// ts
if (ImGui::TableNextColumn()) {
if (!msg_reg.all_of<Components::ConvertedTimeCache>(e)) {
auto time = std::chrono::system_clock::to_time_t(
std::chrono::time_point<std::chrono::system_clock, std::chrono::milliseconds>{std::chrono::milliseconds{ts.ts}}
);
auto localtime = std::localtime(&time);
msg_reg.emplace<Components::ConvertedTimeCache>(
e,
localtime->tm_year,
localtime->tm_yday,
localtime->tm_mon,
localtime->tm_mday,
localtime->tm_hour,
localtime->tm_min
);
}
const auto& ctc = msg_reg.get<Components::ConvertedTimeCache>(e);
ImGui::Text("%.2d:%.2d", localtime->tm_hour, localtime->tm_min);
ImGui::Text("%.2d:%.2d", ctc.tm_hour, ctc.tm_min);
}
// extra