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LibAccelGfx: Skip glyph atlas rebuild if all needed glyphs are present

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Before this change, every repaint required a glyph atlas update, which
took 10-20% of the total painting time according to my testing on
different websites. This change improves that significantly by skipping
atlas updated when all glyphs are already present in the texture.
This commit is contained in:
Aliaksandr Kalenik 2023-11-26 15:33:26 +01:00 • committed by Andreas Kling
parent 28723d8be1
commit c68a9b2cfe
1 changed files with 7 additions and 2 deletions
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9
Userland/Libraries/LibAccelGfx/GlyphAtlas.cpp
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@ -20,20 +20,25 @@ GlyphAtlas& GlyphAtlas::the()
void GlyphAtlas::update(HashMap<Gfx::Font const*, HashTable<u32>> const& unique_glyphs)
{
auto need_to_rebuild_texture = false;
HashMap<GlyphsTextureKey, NonnullRefPtr<Gfx::Bitmap>> glyph_bitmaps;
for (auto const& [font, code_points] : unique_glyphs) {
for (auto const& code_point : code_points) {
auto glyph = font->glyph(code_point);
auto atlas_key = GlyphsTextureKey { font, code_point };
if (!m_glyphs_texture_map.contains(atlas_key))
need_to_rebuild_texture = true;
if (glyph.bitmap()) {
auto atlas_key = GlyphsTextureKey { font, code_point };
glyph_bitmaps.set(atlas_key, *glyph.bitmap());
}
}
}
if (glyph_bitmaps.is_empty())
if (!need_to_rebuild_texture || glyph_bitmaps.is_empty())
return;
m_glyphs_texture_map.clear();
Vector<GlyphsTextureKey> glyphs_sorted_by_height;
glyphs_sorted_by_height.ensure_capacity(glyph_bitmaps.size());
for (auto const& [atlas_key, bitmap] : glyph_bitmaps) {