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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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6
Userland/Libraries/LibWeb/Painting/PaintContext.cpp
View file

@ -5,6 +5,7 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGfx/Painter.h>
#include <LibWeb/Painting/PaintContext.h>
namespace Web {
@ -140,4 +141,9 @@ CSSPixelRect PaintContext::scale_to_css_rect(DevicePixelRect rect) const
};
}
bool PaintContext::would_be_fully_clipped_by_painter(DevicePixelRect rect) const
{
return !painter().clip_rect().intersects(rect.to_type<int>().translated(painter().translation()));
}
}

2
Userland/Libraries/LibWeb/Painting/PaintContext.h
View file

@ -35,6 +35,8 @@ public:
void set_device_viewport_rect(DevicePixelRect const& rect) { m_device_viewport_rect = rect; }
CSSPixelRect css_viewport_rect() const;
[[nodiscard]] bool would_be_fully_clipped_by_painter(DevicePixelRect) const;
bool has_focus() const { return m_focus; }
void set_has_focus(bool focus) { m_focus = focus; }

7
Userland/Libraries/LibWeb/Painting/PaintableBox.cpp
View file

@ -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()) {
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);
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()) {
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);