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LibWeb/CSS: Invalidate color-stop caches when source data changes

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We previously only invalidated the cached color-stop data when the
painted area's size changed. However, multiple elements can use the
same gradient and be the same size, but have different parameters that
affect the gradient stop positions, for example if a stop has an em
position. This can also change for the same element over time.

The new cache instead uses these parameters as the cache key. So we
recompute the cache if lengths would resolve differently, or the area's
size is different.

The included test fails without this change.
This commit is contained in:
Sam Atkins 2025-02-21 16:45:07 +00:00 • committed by Andreas Kling
commit 6a4a60cbd5
Notes: github-actions[bot] 2025-02-28 12:52:25 +00:00
9 changed files with 109 additions and 25 deletions
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8
Libraries/LibWeb/CSS/Length.h
View file

@ -79,6 +79,8 @@ public:
CSSPixels cap_height;
CSSPixels zero_advance;
CSSPixels line_height;
bool operator==(FontMetrics const&) const = default;
};
static Optional<Type> unit_from_name(StringView);
@ -159,12 +161,14 @@ public:
StringView unit_name() const;
struct ResolutionContext {
[[nodiscard]] static Length::ResolutionContext for_window(HTML::Window const&);
[[nodiscard]] static Length::ResolutionContext for_layout_node(Layout::Node const&);
[[nodiscard]] static ResolutionContext for_window(HTML::Window const&);
[[nodiscard]] static ResolutionContext for_layout_node(Layout::Node const&);
CSSPixelRect viewport_rect;
FontMetrics font_metrics;
FontMetrics root_font_metrics;
bool operator==(ResolutionContext const&) const = default;
};
[[nodiscard]] CSSPixels to_px(ResolutionContext const&) const;

10
Libraries/LibWeb/CSS/StyleValues/ConicGradientStyleValue.cpp
View file

@ -1,7 +1,7 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <andreas@ladybird.org>
* Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
* Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2021-2025, Sam Atkins <sam@ladybird.org>
* Copyright (c) 2022-2023, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
@ -38,8 +38,14 @@ String ConicGradientStyleValue::to_string(SerializationMode mode) const
void ConicGradientStyleValue::resolve_for_size(Layout::NodeWithStyleAndBoxModelMetrics const& node, CSSPixelSize size) const
{
if (!m_resolved.has_value())
ResolvedDataCacheKey cache_key {
.length_resolution_context = Length::ResolutionContext::for_layout_node(node),
.size = size,
};
if (m_resolved_data_cache_key != cache_key) {
m_resolved_data_cache_key = move(cache_key);
m_resolved = ResolvedData { Painting::resolve_conic_gradient_data(node, *this), {} };
}
m_resolved->position = m_properties.position->resolved(node, CSSPixelRect { { 0, 0 }, size });
}

10
Libraries/LibWeb/CSS/StyleValues/ConicGradientStyleValue.h
View file

@ -1,7 +1,7 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <andreas@ladybird.org>
* Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
* Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2021-2025, Sam Atkins <sam@ladybird.org>
* Copyright (c) 2022-2023, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
@ -60,11 +60,17 @@ private:
bool operator==(Properties const&) const = default;
} m_properties;
struct ResolvedDataCacheKey {
Length::ResolutionContext length_resolution_context;
CSSPixelSize size;
bool operator==(ResolvedDataCacheKey const&) const = default;
};
mutable Optional<ResolvedDataCacheKey> m_resolved_data_cache_key;
struct ResolvedData {
Painting::ConicGradientData data;
CSSPixelPoint position;
};
mutable Optional<ResolvedData> m_resolved;
};

16
Libraries/LibWeb/CSS/StyleValues/LinearGradientStyleValue.cpp
View file

@ -1,13 +1,14 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <andreas@ladybird.org>
* Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
* Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2021-2025, Sam Atkins <sam@ladybird.org>
* Copyright (c) 2022-2023, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "LinearGradientStyleValue.h"
#include <LibWeb/Layout/Node.h>
#include <LibWeb/Painting/DisplayListRecorder.h>
namespace Web::CSS {
@ -105,15 +106,20 @@ float LinearGradientStyleValue::angle_degrees(CSSPixelSize gradient_size) const
void LinearGradientStyleValue::resolve_for_size(Layout::NodeWithStyleAndBoxModelMetrics const& node, CSSPixelSize size) const
{
if (m_resolved.has_value() && m_resolved->size == size)
return;
m_resolved = ResolvedData { Painting::resolve_linear_gradient_data(node, size, *this), size };
ResolvedDataCacheKey cache_key {
.length_resolution_context = Length::ResolutionContext::for_layout_node(node),
.size = size,
};
if (m_resolved_data_cache_key != cache_key) {
m_resolved_data_cache_key = move(cache_key);
m_resolved = Painting::resolve_linear_gradient_data(node, size, *this);
}
}
void LinearGradientStyleValue::paint(PaintContext& context, DevicePixelRect const& dest_rect, CSS::ImageRendering) const
{
VERIFY(m_resolved.has_value());
context.display_list_recorder().fill_rect_with_linear_gradient(dest_rect.to_type<int>(), m_resolved->data);
context.display_list_recorder().fill_rect_with_linear_gradient(dest_rect.to_type<int>(), m_resolved.value());
}
}

11
Libraries/LibWeb/CSS/StyleValues/LinearGradientStyleValue.h
View file

@ -1,7 +1,7 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <andreas@ladybird.org>
* Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
* Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2021-2025, Sam Atkins <sam@ladybird.org>
* Copyright (c) 2022-2023, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
@ -77,12 +77,13 @@ private:
bool operator==(Properties const&) const = default;
} m_properties;
struct ResolvedData {
Painting::LinearGradientData data;
struct ResolvedDataCacheKey {
Length::ResolutionContext length_resolution_context;
CSSPixelSize size;
bool operator==(ResolvedDataCacheKey const&) const = default;
};
mutable Optional<ResolvedData> m_resolved;
mutable Optional<ResolvedDataCacheKey> m_resolved_data_cache_key;
mutable Optional<Painting::LinearGradientData> m_resolved;
};
}

20
Libraries/LibWeb/CSS/StyleValues/RadialGradientStyleValue.cpp
View file

@ -1,7 +1,7 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <andreas@ladybird.org>
* Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
* Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2021-2025, Sam Atkins <sam@ladybird.org>
* Copyright (c) 2022-2023, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
@ -206,13 +206,19 @@ void RadialGradientStyleValue::resolve_for_size(Layout::NodeWithStyleAndBoxModel
CSSPixelRect gradient_box { { 0, 0 }, paint_size };
auto center = m_properties.position->resolved(node, gradient_box);
auto gradient_size = resolve_size(node, center, gradient_box);
if (m_resolved.has_value() && m_resolved->gradient_size == gradient_size)
return;
m_resolved = ResolvedData {
Painting::resolve_radial_gradient_data(node, gradient_size, *this),
gradient_size,
center,
ResolvedDataCacheKey cache_key {
.length_resolution_context = Length::ResolutionContext::for_layout_node(node),
.size = paint_size,
};
if (m_resolved_data_cache_key != cache_key) {
m_resolved_data_cache_key = move(cache_key);
m_resolved = ResolvedData {
Painting::resolve_radial_gradient_data(node, gradient_size, *this),
gradient_size,
center,
};
}
}
bool RadialGradientStyleValue::equals(CSSStyleValue const& other) const

10
Libraries/LibWeb/CSS/StyleValues/RadialGradientStyleValue.h
View file

@ -1,7 +1,7 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <andreas@ladybird.org>
* Copyright (c) 2021, Tobias Christiansen <tobyase@serenityos.org>
* Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2021-2025, Sam Atkins <sam@ladybird.org>
* Copyright (c) 2022-2023, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
@ -86,12 +86,18 @@ private:
bool operator==(Properties const&) const = default;
} m_properties;
struct ResolvedDataCacheKey {
Length::ResolutionContext length_resolution_context;
CSSPixelSize size;
bool operator==(ResolvedDataCacheKey const&) const = default;
};
mutable Optional<ResolvedDataCacheKey> m_resolved_data_cache_key;
struct ResolvedData {
Painting::RadialGradientData data;
CSSPixelSize gradient_size;
CSSPixelPoint center;
};
mutable Optional<ResolvedData> m_resolved;
};

24
Tests/LibWeb/Ref/expected/css/gradient-em-positions-ref.html Normal file
View file

@ -0,0 +1,24 @@
<!DOCTYPE html>
<style>
div {
width: 250px;
height: 250px;
border: 1px solid black;
}
.linear-gradient.a {
background: linear-gradient(transparent, blue 10px);
}
.linear-gradient.b {
background: linear-gradient(transparent, blue 100px);
}
.radial-gradient.a {
background: radial-gradient(transparent, blue 10px);
}
.radial-gradient.b {
background: radial-gradient(transparent, blue 100px);
}
</style>
<div class="linear-gradient a"></div>
<div class="linear-gradient b"></div>
<div class="radial-gradient a"></div>
<div class="radial-gradient b"></div>

25
Tests/LibWeb/Ref/input/css/gradient-em-positions.html Normal file
View file

@ -0,0 +1,25 @@
<!DOCTYPE html>
<link rel="match" href="../../expected/css/gradient-em-positions-ref.html" />
<style>
div {
width: 250px;
height: 250px;
border: 1px solid black;
}
.linear-gradient {
background: linear-gradient(transparent, blue 1em);
}
.radial-gradient {
background: radial-gradient(transparent, blue 1em);
}
.a {
font-size: 10px;
}
.b {
font-size: 100px;
}
</style>
<div class="linear-gradient a"></div>
<div class="linear-gradient b"></div>
<div class="radial-gradient a"></div>
<div class="radial-gradient b"></div>