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AK+LibWeb: Use segmented vector to store commands in RecordingPainter

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Using a vector to represent a list of painting commands results in many
reallocations, especially on pages with a lot of content.

This change addresses it by introducing a SegmentedVector, which allows
fast appending by representing a list as a sequence of fixed-size
vectors. Currently, this new data structure supports only the
operations used in RecordingPainter, which are appending and iterating.
This commit is contained in:
Aliaksandr Kalenik 2023-12-30 20:07:29 +01:00 • committed by Andreas Kling
parent 97f676dbf2
commit e394971209
4 changed files with 99 additions and 1 deletions
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3
Userland/Libraries/LibWeb/Painting/RecordingPainter.h
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@ -8,6 +8,7 @@
#include <AK/Forward.h>
#include <AK/NonnullRefPtr.h>
#include <AK/SegmentedVector.h>
#include <AK/Utf8View.h>
#include <AK/Vector.h>
#include <LibGfx/AntiAliasingPainter.h>
@ -623,7 +624,7 @@ private:
PaintingCommand command;
};
Vector<PaintingCommandWithScrollFrame> m_painting_commands;
AK::SegmentedVector<PaintingCommandWithScrollFrame, 512> m_painting_commands;
Vector<State> m_state_stack;
};