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LibGUI: Improve visible glyph estimate in GlyphMapWidget

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Previously the widget used a very rough estimate for visible glyphs
based on viewport and glyph areas. Now it simply figures rows times
columns with a two row overdraw to accommodate fractional glyphs
on either end of visible content. For KaticaRegular10, this ends up
reducing unnecessary glyph iterations during painting by about 30%.
This commit is contained in:
thankyouverycool 2022-12-15 17:16:36 -05:00 • committed by Andreas Kling
parent e34503800c
commit a98d5c52f8
2 changed files with 10 additions and 6 deletions
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15
Userland/Libraries/LibGUI/GlyphMapWidget.cpp
View file

@ -128,12 +128,11 @@ void GlyphMapWidget::paint_event(PaintEvent& event)
painter.set_font(font());
painter.fill_rect(widget_inner_rect(), palette().window().darkened(0.8f));
int scroll_steps = vertical_scrollbar().value() / vertical_scrollbar().step();
int first_visible_glyph = scroll_steps * columns();
int range_offset = m_active_range.first;
int last_glyph = m_active_range.last + 1;
auto first_row = vertical_scrollbar().value() / vertical_scrollbar().step();
auto first_glyph = first_row * columns() + m_active_range.first;
auto last_glyph = m_active_range.last;
for (int glyph = first_visible_glyph + range_offset; glyph <= first_visible_glyph + m_visible_glyphs + range_offset && glyph < last_glyph; ++glyph) {
for (u32 glyph = first_glyph; glyph <= first_glyph + m_visible_glyphs && glyph <= last_glyph; ++glyph) {
Gfx::IntRect outer_rect = get_outer_rect(glyph);
Gfx::IntRect inner_rect(
outer_rect.x() + m_horizontal_spacing / 2,
@ -437,10 +436,14 @@ void GlyphMapWidget::recalculate_content_size()
{
auto event_width = widget_inner_rect().width();
auto event_height = widget_inner_rect().height();
m_visible_glyphs = (event_width * event_height) / (font().max_glyph_width() * font().glyph_height());
m_columns = max(event_width / (font().max_glyph_width() + m_horizontal_spacing), 1);
m_rows = ceil_div(m_glyph_count, m_columns);
constexpr auto overdraw_margins = 2;
auto max_visible_rows = event_height / (font().glyph_height() + m_vertical_spacing);
m_visible_rows = min(max_visible_rows, m_rows);
m_visible_glyphs = (m_visible_rows + overdraw_margins) * m_columns;
int content_width = columns() * (font().max_glyph_width() + m_horizontal_spacing);
int content_height = rows() * (font().glyph_height() + m_vertical_spacing);
set_content_size({ content_width, content_height });

1
Userland/Libraries/LibGUI/GlyphMapWidget.h
View file

@ -100,6 +100,7 @@ private:
int m_glyph_count { 0x110000 };
int m_columns { 0 };
int m_rows { 0 };
int m_visible_rows { 0 };
int m_horizontal_spacing { 4 };
int m_vertical_spacing { 4 };
Selection m_selection;