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LibLine: Avoid refreshing the entire line when inserting at the end

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This patchset allows the editor to avoid redrawing the entire line when
the changes cause no unrecoverable style updates, and are at the end of
the line (this applies to most normal typing situations).
Cases that this does not resolve:
- When the cursor is not at the end of the buffer
- When a display refresh changes the styles on the already-drawn parts
  of the line
- When the prompt has not yet been drawn, or has somehow changed

Fixes #5296.
This commit is contained in:
AnotherTest 2021-02-20 21:33:13 +03:30 • committed by Andreas Kling
parent 101c6b01ed
commit 074e2ffdfd
5 changed files with 151 additions and 41 deletions
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167
Userland/Libraries/LibLine/Editor.cpp
View file

@ -26,6 +26,7 @@
*/
#include "Editor.h"
#include <AK/Debug.h>
#include <AK/GenericLexer.h>
#include <AK/JsonObject.h>
#include <AK/ScopeGuard.h>
@ -355,7 +356,7 @@ void Editor::insert(const u32 cp)
}
m_buffer.insert(m_cursor, cp);
++m_chars_inserted_in_the_middle;
++m_chars_touched_in_the_middle;
++m_cursor;
m_inline_search_cursor = m_cursor;
}
@ -443,8 +444,8 @@ void Editor::stylize(const Span& span, const Style& style)
end = offsets.end;
}
auto& spans_starting = style.is_anchored() ? m_anchored_spans_starting : m_spans_starting;
auto& spans_ending = style.is_anchored() ? m_anchored_spans_ending : m_spans_ending;
auto& spans_starting = style.is_anchored() ? m_current_spans.m_anchored_spans_starting : m_current_spans.m_spans_starting;
auto& spans_ending = style.is_anchored() ? m_current_spans.m_anchored_spans_ending : m_current_spans.m_spans_ending;
auto starting_map = spans_starting.get(start).value_or({});
@ -1168,6 +1169,7 @@ void Editor::refresh_display()
// Probably just moving around.
reposition_cursor();
m_cached_buffer_metrics = actual_rendered_string_metrics(buffer_view());
m_drawn_end_of_line_offset = m_buffer.size();
return;
}
@ -1183,32 +1185,20 @@ void Editor::refresh_display()
fputs((char*)m_pending_chars.data(), stderr);
m_pending_chars.clear();
m_drawn_cursor = m_cursor;
m_drawn_end_of_line_offset = m_buffer.size();
m_cached_buffer_metrics = actual_rendered_string_metrics(buffer_view());
m_drawn_spans = m_current_spans;
fflush(stderr);
return;
}
}
// Ouch, reflow entire line.
if (!has_cleaned_up) {
cleanup();
}
VT::move_absolute(m_origin_row, m_origin_column);
auto apply_styles = [&, empty_styles = HashMap<u32, Style> {}](size_t i) {
auto ends = m_current_spans.m_spans_ending.get(i).value_or(empty_styles);
auto starts = m_current_spans.m_spans_starting.get(i).value_or(empty_styles);
fputs(m_new_prompt.characters(), stderr);
VT::clear_to_end_of_line();
HashMap<u32, Style> empty_styles {};
StringBuilder builder;
for (size_t i = 0; i < m_buffer.size(); ++i) {
auto ends = m_spans_ending.get(i).value_or(empty_styles);
auto starts = m_spans_starting.get(i).value_or(empty_styles);
auto anchored_ends = m_anchored_spans_ending.get(i).value_or(empty_styles);
auto anchored_starts = m_anchored_spans_starting.get(i).value_or(empty_styles);
auto c = m_buffer[i];
bool should_print_caret = isascii(c) && iscntrl(c) && c != '\n';
auto anchored_ends = m_current_spans.m_anchored_spans_ending.get(i).value_or(empty_styles);
auto anchored_starts = m_current_spans.m_anchored_spans_starting.get(i).value_or(empty_styles);
if (ends.size() || anchored_ends.size()) {
Style style;
@ -1238,8 +1228,12 @@ void Editor::refresh_display()
// Set new styles.
VT::apply_style(style, true);
}
};
builder.clear();
auto print_character_at = [this](size_t i) {
StringBuilder builder;
auto c = m_buffer[i];
bool should_print_caret = isascii(c) && iscntrl(c) && c != '\n';
if (should_print_caret)
builder.appendff("^{:c}", c + 64);
else
@ -1252,6 +1246,63 @@ void Editor::refresh_display()
if (should_print_caret)
fputs("\033[27m", stderr);
};
// If there have been no changes to previous sections of the line (style or text)
// just append the new text with the appropriate styles.
if (m_cached_prompt_valid && m_chars_touched_in_the_middle == 0 && m_drawn_spans.contains_up_to_offset(m_current_spans, m_drawn_cursor)) {
auto initial_style = find_applicable_style(m_drawn_end_of_line_offset);
VT::apply_style(initial_style);
for (size_t i = m_drawn_end_of_line_offset; i < m_buffer.size(); ++i) {
apply_styles(i);
print_character_at(i);
}
VT::apply_style(Style::reset_style());
m_pending_chars.clear();
m_refresh_needed = false;
m_cached_buffer_metrics = actual_rendered_string_metrics(buffer_view());
m_chars_touched_in_the_middle = 0;
m_drawn_end_of_line_offset = m_buffer.size();
// No need to reposition the cursor, the cursor is already where it needs to be.
return;
}
if constexpr (LINE_EDITOR_DEBUG) {
if (m_cached_prompt_valid && m_chars_touched_in_the_middle == 0) {
auto x = m_drawn_spans.contains_up_to_offset(m_current_spans, m_drawn_cursor);
dbgln("Contains: {} At offset: {}", x, m_drawn_cursor);
dbgln("Drawn Spans:");
for (auto& sentry : m_drawn_spans.m_spans_starting) {
for (auto& entry : sentry.value) {
dbgln("{}-{}: {}", sentry.key, entry.key, entry.value.to_string());
}
}
dbgln("==========================================================================");
dbgln("Current Spans:");
for (auto& sentry : m_current_spans.m_spans_starting) {
for (auto& entry : sentry.value) {
dbgln("{}-{}: {}", sentry.key, entry.key, entry.value.to_string());
}
}
}
}
// Ouch, reflow entire line.
if (!has_cleaned_up) {
cleanup();
}
VT::move_absolute(m_origin_row, m_origin_column);
fputs(m_new_prompt.characters(), stderr);
VT::clear_to_end_of_line();
StringBuilder builder;
for (size_t i = 0; i < m_buffer.size(); ++i) {
apply_styles(i);
print_character_at(i);
}
VT::apply_style(Style::reset_style()); // don't bleed to EOL
@ -1259,10 +1310,10 @@ void Editor::refresh_display()
m_pending_chars.clear();
m_refresh_needed = false;
m_cached_buffer_metrics = actual_rendered_string_metrics(buffer_view());
m_chars_inserted_in_the_middle = 0;
if (!m_cached_prompt_valid) {
m_cached_prompt_valid = true;
}
m_chars_touched_in_the_middle = 0;
m_drawn_spans = m_current_spans;
m_drawn_end_of_line_offset = m_buffer.size();
m_cached_prompt_valid = true;
reposition_cursor();
fflush(stderr);
@ -1270,12 +1321,12 @@ void Editor::refresh_display()
void Editor::strip_styles(bool strip_anchored)
{
m_spans_starting.clear();
m_spans_ending.clear();
m_current_spans.m_spans_starting.clear();
m_current_spans.m_spans_ending.clear();
if (strip_anchored) {
m_anchored_spans_starting.clear();
m_anchored_spans_ending.clear();
m_current_spans.m_anchored_spans_starting.clear();
m_current_spans.m_anchored_spans_ending.clear();
}
m_refresh_needed = true;
@ -1346,11 +1397,11 @@ Style Editor::find_applicable_style(size_t offset) const
}
};
for (auto& entry : m_spans_starting) {
for (auto& entry : m_current_spans.m_spans_starting) {
unify(entry);
}
for (auto& entry : m_anchored_spans_starting) {
for (auto& entry : m_current_spans.m_anchored_spans_starting) {
unify(entry);
}
@ -1693,6 +1744,7 @@ void Editor::remove_at_index(size_t index)
m_buffer.remove(index);
if (cp == '\n')
++m_extra_forward_lines;
++m_chars_touched_in_the_middle;
}
void Editor::readjust_anchored_styles(size_t hint_index, ModificationKind modification)
@ -1706,7 +1758,7 @@ void Editor::readjust_anchored_styles(size_t hint_index, ModificationKind modifi
auto index_shift = modification == ModificationKind::Insertion ? 1 : -1;
auto forced_removal = modification == ModificationKind::ForcedOverlapRemoval;
for (auto& start_entry : m_anchored_spans_starting) {
for (auto& start_entry : m_current_spans.m_anchored_spans_starting) {
for (auto& end_entry : start_entry.value) {
if (forced_removal) {
if (start_entry.key <= hint_index && end_entry.key > hint_index) {
@ -1732,8 +1784,8 @@ void Editor::readjust_anchored_styles(size_t hint_index, ModificationKind modifi
}
}
m_anchored_spans_ending.clear();
m_anchored_spans_starting.clear();
m_current_spans.m_anchored_spans_ending.clear();
m_current_spans.m_anchored_spans_starting.clear();
// Pass over the relocations and update the stale entries.
for (auto& relocation : anchors_to_relocate) {
stylize(relocation.new_span, relocation.style);
@ -1767,4 +1819,47 @@ size_t StringMetrics::offset_with_addition(const StringMetrics& offset, size_t c
return last % column_width;
}
bool Editor::Spans::contains_up_to_offset(const Spans& other, size_t offset) const
{
auto compare = [&]<typename K, typename V>(const HashMap<K, HashMap<K, V>>& left, const HashMap<K, HashMap<K, V>>& right) -> bool {
for (auto& entry : right) {
if (entry.key > offset + 1)
continue;
auto left_map = left.get(entry.key);
if (!left_map.has_value())
return false;
for (auto& left_entry : left_map.value()) {
if (auto value = entry.value.get(left_entry.key); !value.has_value()) {
// Might have the same thing with a longer span
bool found = false;
for (auto& possibly_longer_span_entry : entry.value) {
if (possibly_longer_span_entry.key > left_entry.key && possibly_longer_span_entry.key > offset && left_entry.value == possibly_longer_span_entry.value) {
found = true;
break;
}
}
if (found)
continue;
if constexpr (LINE_EDITOR_DEBUG) {
dbgln("Compare for {}-{} failed, no entry", entry.key, left_entry.key);
for (auto& x : entry.value)
dbgln("Have: {}-{} = {}", entry.key, x.key, x.value.to_string());
}
return false;
} else if (value.value() != left_entry.value) {
dbgln_if(LINE_EDITOR_DEBUG, "Compare for {}-{} failed, different values: {} != {}", entry.key, left_entry.key, value.value().to_string(), left_entry.value.to_string());
return false;
}
}
}
return true;
};
return compare(m_spans_starting, other.m_spans_starting)
&& compare(m_anchored_spans_starting, other.m_anchored_spans_starting);
}
}