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LibWeb: Don't draw text fragments that would be clipped by the painter

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This avoids a ton of work when painting large documents. Even though it
would eventually get clipped by the painter anyway, by bailing out
earlier, we avoid a lot more work (UTF-8 iteration, OpenType lookups,
etc).

It would be even nicer if we could skip entire line boxes, but we don't
have a fast way to get the bounding rect of a line box at the moment.
This commit is contained in:
Andreas Kling 2023-05-23 11:27:16 +02:00
parent df1bb0ff49
commit fe92b54137
3 changed files with 13 additions and 2 deletions
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7
Userland/Libraries/LibWeb/Painting/PaintableBox.cpp
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@ -598,9 +598,12 @@ void PaintableWithLines::paint(PaintContext& context, PaintPhase phase) const
for (auto& line_box : m_line_boxes) {
for (auto& fragment : line_box.fragments()) {
auto fragment_absolute_rect = fragment.absolute_rect();
auto fragment_absolute_device_rect = context.enclosing_device_rect(fragment_absolute_rect);
if (context.would_be_fully_clipped_by_painter(fragment_absolute_device_rect))
continue;
if (context.should_show_line_box_borders()) {
auto fragment_absolute_rect = fragment.absolute_rect();
context.painter().draw_rect(context.enclosing_device_rect(fragment_absolute_rect).to_type<int>(), Color::Green);
context.painter().draw_rect(fragment_absolute_device_rect.to_type<int>(), Color::Green);
context.painter().draw_line(
context.rounded_device_point(fragment_absolute_rect.top_left().translated(0, fragment.baseline())).to_type<int>(),
context.rounded_device_point(fragment_absolute_rect.top_right().translated(-1, fragment.baseline())).to_type<int>(), Color::Red);