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https://github.com/LadybirdBrowser/ladybird.git
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5fdcf207f8
Extract the box size computation into a new compute_box_size() that returns a plain struct with two doubles, and use it in is_active() instead of calculate_box_size() which allocates a GC-managed ResizeObserverSize object. Since is_active() only needs to compare sizes and immediately discards the result, there's no reason to involve the GC. The GC-allocating calculate_box_size() now delegates to compute_box_size() internally. This was 2.6% of CPU time while playing a YouTube video.
75 lines
2.7 KiB
C++
75 lines
2.7 KiB
C++
/*
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* Copyright (c) 2024, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibGC/Heap.h>
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#include <LibWeb/Bindings/ResizeObserverSizePrototype.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/HTML/Window.h>
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#include <LibWeb/Painting/PaintableBox.h>
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#include <LibWeb/ResizeObserver/ResizeObserverSize.h>
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namespace Web::ResizeObserver {
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GC_DEFINE_ALLOCATOR(ResizeObserverSize);
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void ResizeObserverSize::initialize(JS::Realm& realm)
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{
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WEB_SET_PROTOTYPE_FOR_INTERFACE(ResizeObserverSize);
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Base::initialize(realm);
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}
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// https://drafts.csswg.org/resize-observer-1/#calculate-box-size
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ResizeObserverSize::RawSize ResizeObserverSize::compute_box_size(DOM::Element& target, Bindings::ResizeObserverBoxOptions observed_box)
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{
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RawSize size;
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// FIXME: If target is an SVGGraphicsElement that does not have an associated CSS layout box:
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// Otherwise:
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if (target.paintable_box()) {
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auto const& paintable_box = *target.paintable_box();
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switch (observed_box) {
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case Bindings::ResizeObserverBoxOptions::BorderBox:
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size.inline_size = paintable_box.border_box_width().to_double();
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size.block_size = paintable_box.border_box_height().to_double();
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break;
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case Bindings::ResizeObserverBoxOptions::ContentBox:
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size.inline_size = paintable_box.content_width().to_double();
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size.block_size = paintable_box.content_height().to_double();
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break;
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case Bindings::ResizeObserverBoxOptions::DevicePixelContentBox: {
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auto device_pixel_ratio = target.document().window()->device_pixel_ratio();
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size.inline_size = paintable_box.border_box_width().to_double() * device_pixel_ratio;
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size.block_size = paintable_box.border_box_height().to_double() * device_pixel_ratio;
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break;
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}
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default:
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VERIFY_NOT_REACHED();
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}
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}
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return size;
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}
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GC::Ref<ResizeObserverSize> ResizeObserverSize::calculate_box_size(JS::Realm& realm, DOM::Element& target, Bindings::ResizeObserverBoxOptions observed_box)
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{
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auto raw = compute_box_size(target, observed_box);
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auto computed_size = realm.create<ResizeObserverSize>(realm);
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computed_size->set_inline_size(raw.inline_size);
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computed_size->set_block_size(raw.block_size);
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return computed_size;
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}
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bool ResizeObserverSize::equals(RawSize const& other) const
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{
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return m_inline_size == other.inline_size && m_block_size == other.block_size;
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}
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bool ResizeObserverSize::equals(ResizeObserverSize const& other) const
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{
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return m_inline_size == other.m_inline_size && m_block_size == other.m_block_size;
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}
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}
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