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LibWeb: Implement CSS fonts lazy loading

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By loading only the fonts actually used on a page, we can often avoid
making a lot of unnecessary requests and style invalidations.

This change makes initial loading of apple.com much faster.

Fixes https://github.com/SerenityOS/serenity/issues/20747
This commit is contained in:
Aliaksandr Kalenik 2023-10-02 21:31:20 +02:00 committed by Andreas Kling
parent 005bdd210a
commit b1ee5c8738
1 changed files with 6 additions and 3 deletions
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9
Userland/Libraries/LibWeb/CSS/StyleComputer.cpp
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@ -96,7 +96,6 @@ public:
, m_family_name(move(family_name))
, m_urls(move(urls))
{
start_loading_next_url();
}
virtual ~FontLoader() override { }
@ -114,10 +113,12 @@ public:
{
}
RefPtr<Gfx::Font> font_with_point_size(float point_size) const
RefPtr<Gfx::Font> font_with_point_size(float point_size)
{
if (!m_vector_font)
if (!m_vector_font) {
start_loading_next_url();
return nullptr;
}
if (auto it = m_cached_fonts.find(point_size); it != m_cached_fonts.end())
return it->value;
@ -136,6 +137,8 @@ public:
private:
void start_loading_next_url()
{
if (resource() && resource()->is_pending())
return;
if (m_urls.is_empty())
return;
LoadRequest request;