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StyleComputer.cpp
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StyleComputer.cpp
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/*
* Copyright (c) 2018-2023, Andreas Kling <[email protected]>
* Copyright (c) 2021, the SerenityOS developers.
* Copyright (c) 2021-2023, Sam Atkins <[email protected]>
* Copyright (c) 2024, Matthew Olsson <[email protected]>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/BinarySearch.h>
#include <AK/Debug.h>
#include <AK/Error.h>
#include <AK/Find.h>
#include <AK/Function.h>
#include <AK/HashMap.h>
#include <AK/Math.h>
#include <AK/QuickSort.h>
#include <AK/TemporaryChange.h>
#include <LibGfx/Font/Font.h>
#include <LibGfx/Font/FontDatabase.h>
#include <LibGfx/Font/FontStyleMapping.h>
#include <LibGfx/Font/OpenType/Font.h>
#include <LibGfx/Font/ScaledFont.h>
#include <LibGfx/Font/VectorFont.h>
#include <LibGfx/Font/WOFF/Font.h>
#include <LibGfx/Font/WOFF2/Font.h>
#include <LibWeb/Animations/AnimationEffect.h>
#include <LibWeb/Animations/DocumentTimeline.h>
#include <LibWeb/Animations/TimingFunction.h>
#include <LibWeb/CSS/AnimationEvent.h>
#include <LibWeb/CSS/CSSAnimation.h>
#include <LibWeb/CSS/CSSFontFaceRule.h>
#include <LibWeb/CSS/CSSImportRule.h>
#include <LibWeb/CSS/CSSStyleRule.h>
#include <LibWeb/CSS/Parser/Parser.h>
#include <LibWeb/CSS/SelectorEngine.h>
#include <LibWeb/CSS/StyleComputer.h>
#include <LibWeb/CSS/StyleSheet.h>
#include <LibWeb/CSS/StyleValues/AngleStyleValue.h>
#include <LibWeb/CSS/StyleValues/BorderRadiusStyleValue.h>
#include <LibWeb/CSS/StyleValues/ColorStyleValue.h>
#include <LibWeb/CSS/StyleValues/CustomIdentStyleValue.h>
#include <LibWeb/CSS/StyleValues/DisplayStyleValue.h>
#include <LibWeb/CSS/StyleValues/EasingStyleValue.h>
#include <LibWeb/CSS/StyleValues/FilterValueListStyleValue.h>
#include <LibWeb/CSS/StyleValues/GridTrackPlacementStyleValue.h>
#include <LibWeb/CSS/StyleValues/GridTrackSizeListStyleValue.h>
#include <LibWeb/CSS/StyleValues/IdentifierStyleValue.h>
#include <LibWeb/CSS/StyleValues/IntegerStyleValue.h>
#include <LibWeb/CSS/StyleValues/LengthStyleValue.h>
#include <LibWeb/CSS/StyleValues/MathDepthStyleValue.h>
#include <LibWeb/CSS/StyleValues/NumberStyleValue.h>
#include <LibWeb/CSS/StyleValues/PercentageStyleValue.h>
#include <LibWeb/CSS/StyleValues/PositionStyleValue.h>
#include <LibWeb/CSS/StyleValues/RectStyleValue.h>
#include <LibWeb/CSS/StyleValues/ShorthandStyleValue.h>
#include <LibWeb/CSS/StyleValues/StringStyleValue.h>
#include <LibWeb/CSS/StyleValues/StyleValueList.h>
#include <LibWeb/CSS/StyleValues/TimeStyleValue.h>
#include <LibWeb/CSS/StyleValues/TransformationStyleValue.h>
#include <LibWeb/CSS/StyleValues/UnresolvedStyleValue.h>
#include <LibWeb/CSS/StyleValues/UnsetStyleValue.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/DOM/Element.h>
#include <LibWeb/HTML/HTMLBRElement.h>
#include <LibWeb/HTML/HTMLHtmlElement.h>
#include <LibWeb/HTML/Scripting/TemporaryExecutionContext.h>
#include <LibWeb/HighResolutionTime/TimeOrigin.h>
#include <LibWeb/Layout/Node.h>
#include <LibWeb/Loader/ResourceLoader.h>
#include <LibWeb/Namespace.h>
#include <LibWeb/Painting/PaintableBox.h>
#include <LibWeb/Platform/FontPlugin.h>
#include <LibWeb/ReferrerPolicy/AbstractOperations.h>
#include <math.h>
#include <stdio.h>
namespace AK {
// traits for FontFaceKey
template<>
struct Traits<Web::CSS::FontFaceKey> : public DefaultTraits<Web::CSS::FontFaceKey> {
static unsigned hash(Web::CSS::FontFaceKey const& key) { return pair_int_hash(key.family_name.hash(), pair_int_hash(key.weight, key.slope)); }
};
}
namespace Web::CSS {
static DOM::Element const* element_to_inherit_style_from(DOM::Element const*, Optional<CSS::Selector::PseudoElement::Type>);
static NonnullRefPtr<StyleValue const> get_inherit_value(JS::Realm& initial_value_context_realm, CSS::PropertyID, DOM::Element const*, Optional<CSS::Selector::PseudoElement::Type>);
StyleComputer::StyleComputer(DOM::Document& document)
: m_document(document)
, m_default_font_metrics(16, Gfx::FontDatabase::default_font().pixel_metrics())
, m_root_element_font_metrics(m_default_font_metrics)
{
}
StyleComputer::~StyleComputer() = default;
class StyleComputer::FontLoader : public ResourceClient {
public:
explicit FontLoader(StyleComputer& style_computer, FlyString family_name, Vector<Gfx::UnicodeRange> unicode_ranges, Vector<URL> urls)
: m_style_computer(style_computer)
, m_family_name(move(family_name))
, m_unicode_ranges(move(unicode_ranges))
, m_urls(move(urls))
{
}
virtual ~FontLoader() override { }
Vector<Gfx::UnicodeRange> const& unicode_ranges() const { return m_unicode_ranges; }
virtual void resource_did_load() override
{
auto result = try_load_font();
if (result.is_error())
return start_loading_next_url();
m_vector_font = result.release_value();
m_style_computer.did_load_font(m_family_name);
}
virtual void resource_did_fail() override
{
}
RefPtr<Gfx::Font> font_with_point_size(float point_size)
{
if (!m_vector_font) {
start_loading_next_url();
return nullptr;
}
return m_vector_font->scaled_font(point_size);
}
private:
void start_loading_next_url()
{
if (resource() && resource()->is_pending())
return;
if (m_urls.is_empty())
return;
LoadRequest request;
request.set_url(m_urls.take_first());
// HACK: We're crudely computing the referer value and shoving it into the
// request until fetch infrastructure is used here.
auto referrer_url = ReferrerPolicy::strip_url_for_use_as_referrer(m_style_computer.document().url());
if (referrer_url.has_value() && !request.headers().contains("Referer"))
request.set_header("Referer", referrer_url->serialize());
set_resource(ResourceLoader::the().load_resource(Resource::Type::Generic, request));
}
ErrorOr<NonnullRefPtr<Gfx::VectorFont>> try_load_font()
{
// FIXME: This could maybe use the format() provided in @font-face as well, since often the mime type is just application/octet-stream and we have to try every format
auto mime_type = resource()->mime_type();
if (mime_type == "font/ttf"sv || mime_type == "application/x-font-ttf"sv)
return TRY(OpenType::Font::try_load_from_externally_owned_memory(resource()->encoded_data()));
if (mime_type == "font/woff"sv || mime_type == "application/font-woff"sv)
return TRY(WOFF::Font::try_load_from_externally_owned_memory(resource()->encoded_data()));
if (mime_type == "font/woff2"sv || mime_type == "application/font-woff2"sv) {
auto woff2 = WOFF2::Font::try_load_from_externally_owned_memory(resource()->encoded_data());
if (woff2.is_error()) {
dbgln("WOFF2 error: {}", woff2.error());
return woff2.release_error();
}
return woff2.release_value();
}
auto ttf = OpenType::Font::try_load_from_externally_owned_memory(resource()->encoded_data());
if (!ttf.is_error())
return ttf.release_value();
auto woff = WOFF::Font::try_load_from_externally_owned_memory(resource()->encoded_data());
if (!woff.is_error())
return woff.release_value();
auto woff2 = WOFF2::Font::try_load_from_externally_owned_memory(resource()->encoded_data());
if (!woff2.is_error())
return woff2.release_value();
return woff2.release_error();
}
StyleComputer& m_style_computer;
FlyString m_family_name;
Vector<Gfx::UnicodeRange> m_unicode_ranges;
RefPtr<Gfx::VectorFont> m_vector_font;
Vector<URL> m_urls;
};
struct StyleComputer::MatchingFontCandidate {
FontFaceKey key;
Variant<FontLoaderList*, Gfx::Typeface const*> loader_or_typeface;
[[nodiscard]] RefPtr<Gfx::FontCascadeList const> font_with_point_size(float point_size) const
{
RefPtr<Gfx::FontCascadeList> font_list = Gfx::FontCascadeList::create();
if (auto* loader_list = loader_or_typeface.get_pointer<FontLoaderList*>(); loader_list) {
for (auto const& loader : **loader_list) {
if (auto font = loader->font_with_point_size(point_size); font)
font_list->add(*font, loader->unicode_ranges());
}
return font_list;
}
if (auto font = loader_or_typeface.get<Gfx::Typeface const*>()->get_font(point_size))
font_list->add(*font);
return font_list;
}
};
static CSSStyleSheet& default_stylesheet(DOM::Document const& document)
{
static JS::Handle<CSSStyleSheet> sheet;
if (!sheet.cell()) {
extern StringView default_stylesheet_source;
sheet = JS::make_handle(parse_css_stylesheet(CSS::Parser::ParsingContext(document), default_stylesheet_source));
}
return *sheet;
}
static CSSStyleSheet& quirks_mode_stylesheet(DOM::Document const& document)
{
static JS::Handle<CSSStyleSheet> sheet;
if (!sheet.cell()) {
extern StringView quirks_mode_stylesheet_source;
sheet = JS::make_handle(parse_css_stylesheet(CSS::Parser::ParsingContext(document), quirks_mode_stylesheet_source));
}
return *sheet;
}
static CSSStyleSheet& mathml_stylesheet(DOM::Document const& document)
{
static JS::Handle<CSSStyleSheet> sheet;
if (!sheet.cell()) {
extern StringView mathml_stylesheet_source;
sheet = JS::make_handle(parse_css_stylesheet(CSS::Parser::ParsingContext(document), mathml_stylesheet_source));
}
return *sheet;
}
static CSSStyleSheet& svg_stylesheet(DOM::Document const& document)
{
static JS::Handle<CSSStyleSheet> sheet;
if (!sheet.cell()) {
extern StringView svg_stylesheet_source;
sheet = JS::make_handle(parse_css_stylesheet(CSS::Parser::ParsingContext(document), svg_stylesheet_source));
}
return *sheet;
}
template<typename Callback>
void StyleComputer::for_each_stylesheet(CascadeOrigin cascade_origin, Callback callback) const
{
if (cascade_origin == CascadeOrigin::UserAgent) {
callback(default_stylesheet(document()));
if (document().in_quirks_mode())
callback(quirks_mode_stylesheet(document()));
callback(mathml_stylesheet(document()));
callback(svg_stylesheet(document()));
}
if (cascade_origin == CascadeOrigin::User) {
if (m_user_style_sheet)
callback(*m_user_style_sheet);
}
if (cascade_origin == CascadeOrigin::Author) {
for (auto const& sheet : document().style_sheets().sheets())
callback(*sheet);
}
}
StyleComputer::RuleCache const& StyleComputer::rule_cache_for_cascade_origin(CascadeOrigin cascade_origin) const
{
switch (cascade_origin) {
case CascadeOrigin::Author:
return *m_author_rule_cache;
case CascadeOrigin::User:
return *m_user_rule_cache;
case CascadeOrigin::UserAgent:
return *m_user_agent_rule_cache;
default:
TODO();
}
}
[[nodiscard]] static bool filter_namespace_rule(DOM::Element const& element, MatchingRule const& rule)
{
// FIXME: Filter out non-default namespace using prefixes
auto namespace_uri = rule.sheet->default_namespace();
if (namespace_uri.has_value() && namespace_uri.value() != element.namespace_uri()) {
return false;
}
return true;
}
Vector<MatchingRule> StyleComputer::collect_matching_rules(DOM::Element const& element, CascadeOrigin cascade_origin, Optional<CSS::Selector::PseudoElement::Type> pseudo_element) const
{
auto const& rule_cache = rule_cache_for_cascade_origin(cascade_origin);
Vector<MatchingRule> rules_to_run;
auto add_rules_to_run = [&](Vector<MatchingRule> const& rules) {
rules_to_run.grow_capacity(rules_to_run.size() + rules.size());
if (pseudo_element.has_value()) {
for (auto const& rule : rules) {
if (rule.contains_pseudo_element && filter_namespace_rule(element, rule))
rules_to_run.append(rule);
}
} else {
for (auto const& rule : rules) {
if (filter_namespace_rule(element, rule))
rules_to_run.append(rule);
}
}
};
for (auto const& class_name : element.class_names()) {
if (auto it = rule_cache.rules_by_class.find(class_name); it != rule_cache.rules_by_class.end())
add_rules_to_run(it->value);
}
if (auto id = element.id(); id.has_value()) {
if (auto it = rule_cache.rules_by_id.find(id.value()); it != rule_cache.rules_by_id.end())
add_rules_to_run(it->value);
}
if (auto it = rule_cache.rules_by_tag_name.find(element.local_name()); it != rule_cache.rules_by_tag_name.end())
add_rules_to_run(it->value);
add_rules_to_run(rule_cache.other_rules);
Vector<MatchingRule> matching_rules;
matching_rules.ensure_capacity(rules_to_run.size());
for (auto const& rule_to_run : rules_to_run) {
auto const& selector = rule_to_run.rule->selectors()[rule_to_run.selector_index];
if (SelectorEngine::matches(selector, *rule_to_run.sheet, element, pseudo_element))
matching_rules.append(rule_to_run);
}
return matching_rules;
}
static void sort_matching_rules(Vector<MatchingRule>& matching_rules)
{
quick_sort(matching_rules, [&](MatchingRule& a, MatchingRule& b) {
auto const& a_selector = a.rule->selectors()[a.selector_index];
auto const& b_selector = b.rule->selectors()[b.selector_index];
auto a_specificity = a_selector->specificity();
auto b_specificity = b_selector->specificity();
if (a_selector->specificity() == b_selector->specificity()) {
if (a.style_sheet_index == b.style_sheet_index)
return a.rule_index < b.rule_index;
return a.style_sheet_index < b.style_sheet_index;
}
return a_specificity < b_specificity;
});
}
void StyleComputer::for_each_property_expanding_shorthands(PropertyID property_id, StyleValue const& value, Function<void(PropertyID, StyleValue const&)> const& set_longhand_property)
{
auto map_logical_property_to_real_property = [](PropertyID property_id) -> Optional<PropertyID> {
// FIXME: Honor writing-mode, direction and text-orientation.
switch (property_id) {
case PropertyID::MarginBlockStart:
return PropertyID::MarginTop;
case PropertyID::MarginBlockEnd:
return PropertyID::MarginBottom;
case PropertyID::MarginInlineStart:
return PropertyID::MarginLeft;
case PropertyID::MarginInlineEnd:
return PropertyID::MarginRight;
case PropertyID::PaddingBlockStart:
return PropertyID::PaddingTop;
case PropertyID::PaddingBlockEnd:
return PropertyID::PaddingBottom;
case PropertyID::PaddingInlineStart:
return PropertyID::PaddingLeft;
case PropertyID::PaddingInlineEnd:
return PropertyID::PaddingRight;
case PropertyID::InsetBlockStart:
return PropertyID::Top;
case PropertyID::InsetBlockEnd:
return PropertyID::Bottom;
case PropertyID::InsetInlineStart:
return PropertyID::Left;
case PropertyID::InsetInlineEnd:
return PropertyID::Right;
case PropertyID::WebkitAppearance:
return PropertyID::Appearance;
default:
return {};
}
};
struct StartAndEndPropertyIDs {
PropertyID start;
PropertyID end;
};
auto map_logical_property_to_real_properties = [](PropertyID property_id) -> Optional<StartAndEndPropertyIDs> {
// FIXME: Honor writing-mode, direction and text-orientation.
switch (property_id) {
case PropertyID::MarginBlock:
return StartAndEndPropertyIDs { PropertyID::MarginTop, PropertyID::MarginBottom };
case PropertyID::MarginInline:
return StartAndEndPropertyIDs { PropertyID::MarginLeft, PropertyID::MarginRight };
case PropertyID::PaddingBlock:
return StartAndEndPropertyIDs { PropertyID::PaddingTop, PropertyID::PaddingBottom };
case PropertyID::PaddingInline:
return StartAndEndPropertyIDs { PropertyID::PaddingLeft, PropertyID::PaddingRight };
case PropertyID::InsetBlock:
return StartAndEndPropertyIDs { PropertyID::Top, PropertyID::Bottom };
case PropertyID::InsetInline:
return StartAndEndPropertyIDs { PropertyID::Left, PropertyID::Right };
default:
return {};
}
};
if (auto real_property_id = map_logical_property_to_real_property(property_id); real_property_id.has_value()) {
for_each_property_expanding_shorthands(real_property_id.value(), value, set_longhand_property);
return;
}
if (auto real_property_ids = map_logical_property_to_real_properties(property_id); real_property_ids.has_value()) {
if (value.is_value_list() && value.as_value_list().size() == 2) {
auto const& start = value.as_value_list().values()[0];
auto const& end = value.as_value_list().values()[1];
for_each_property_expanding_shorthands(real_property_ids->start, start, set_longhand_property);
for_each_property_expanding_shorthands(real_property_ids->end, end, set_longhand_property);
return;
}
for_each_property_expanding_shorthands(real_property_ids->start, value, set_longhand_property);
for_each_property_expanding_shorthands(real_property_ids->end, value, set_longhand_property);
return;
}
if (value.is_shorthand()) {
auto& shorthand_value = value.as_shorthand();
auto& properties = shorthand_value.sub_properties();
auto& values = shorthand_value.values();
for (size_t i = 0; i < properties.size(); ++i)
for_each_property_expanding_shorthands(properties[i], values[i], set_longhand_property);
return;
}
auto assign_edge_values = [&](PropertyID top_property, PropertyID right_property, PropertyID bottom_property, PropertyID left_property, auto const& values) {
if (values.size() == 4) {
set_longhand_property(top_property, values[0]);
set_longhand_property(right_property, values[1]);
set_longhand_property(bottom_property, values[2]);
set_longhand_property(left_property, values[3]);
} else if (values.size() == 3) {
set_longhand_property(top_property, values[0]);
set_longhand_property(right_property, values[1]);
set_longhand_property(bottom_property, values[2]);
set_longhand_property(left_property, values[1]);
} else if (values.size() == 2) {
set_longhand_property(top_property, values[0]);
set_longhand_property(right_property, values[1]);
set_longhand_property(bottom_property, values[0]);
set_longhand_property(left_property, values[1]);
} else if (values.size() == 1) {
set_longhand_property(top_property, values[0]);
set_longhand_property(right_property, values[0]);
set_longhand_property(bottom_property, values[0]);
set_longhand_property(left_property, values[0]);
}
};
if (property_id == CSS::PropertyID::Border) {
for_each_property_expanding_shorthands(CSS::PropertyID::BorderTop, value, set_longhand_property);
for_each_property_expanding_shorthands(CSS::PropertyID::BorderRight, value, set_longhand_property);
for_each_property_expanding_shorthands(CSS::PropertyID::BorderBottom, value, set_longhand_property);
for_each_property_expanding_shorthands(CSS::PropertyID::BorderLeft, value, set_longhand_property);
// FIXME: Also reset border-image, in line with the spec: https://www.w3.org/TR/css-backgrounds-3/#border-shorthands
return;
}
if (property_id == CSS::PropertyID::BorderStyle) {
if (value.is_value_list()) {
auto const& values_list = value.as_value_list();
assign_edge_values(PropertyID::BorderTopStyle, PropertyID::BorderRightStyle, PropertyID::BorderBottomStyle, PropertyID::BorderLeftStyle, values_list.values());
return;
}
set_longhand_property(CSS::PropertyID::BorderTopStyle, value);
set_longhand_property(CSS::PropertyID::BorderRightStyle, value);
set_longhand_property(CSS::PropertyID::BorderBottomStyle, value);
set_longhand_property(CSS::PropertyID::BorderLeftStyle, value);
return;
}
if (property_id == CSS::PropertyID::BorderWidth) {
if (value.is_value_list()) {
auto const& values_list = value.as_value_list();
assign_edge_values(PropertyID::BorderTopWidth, PropertyID::BorderRightWidth, PropertyID::BorderBottomWidth, PropertyID::BorderLeftWidth, values_list.values());
return;
}
set_longhand_property(CSS::PropertyID::BorderTopWidth, value);
set_longhand_property(CSS::PropertyID::BorderRightWidth, value);
set_longhand_property(CSS::PropertyID::BorderBottomWidth, value);
set_longhand_property(CSS::PropertyID::BorderLeftWidth, value);
return;
}
if (property_id == CSS::PropertyID::BorderColor) {
if (value.is_value_list()) {
auto const& values_list = value.as_value_list();
assign_edge_values(PropertyID::BorderTopColor, PropertyID::BorderRightColor, PropertyID::BorderBottomColor, PropertyID::BorderLeftColor, values_list.values());
return;
}
set_longhand_property(CSS::PropertyID::BorderTopColor, value);
set_longhand_property(CSS::PropertyID::BorderRightColor, value);
set_longhand_property(CSS::PropertyID::BorderBottomColor, value);
set_longhand_property(CSS::PropertyID::BorderLeftColor, value);
return;
}
if (property_id == CSS::PropertyID::BackgroundPosition) {
if (value.is_position()) {
auto const& position = value.as_position();
set_longhand_property(CSS::PropertyID::BackgroundPositionX, position.edge_x());
set_longhand_property(CSS::PropertyID::BackgroundPositionY, position.edge_y());
} else if (value.is_value_list()) {
// Expand background-position layer list into separate lists for x and y positions:
auto const& values_list = value.as_value_list();
StyleValueVector x_positions {};
StyleValueVector y_positions {};
x_positions.ensure_capacity(values_list.size());
y_positions.ensure_capacity(values_list.size());
for (auto& layer : values_list.values()) {
if (layer->is_position()) {
auto const& position = layer->as_position();
x_positions.unchecked_append(position.edge_x());
y_positions.unchecked_append(position.edge_y());
} else {
x_positions.unchecked_append(layer);
y_positions.unchecked_append(layer);
}
}
set_longhand_property(CSS::PropertyID::BackgroundPositionX, StyleValueList::create(move(x_positions), values_list.separator()));
set_longhand_property(CSS::PropertyID::BackgroundPositionY, StyleValueList::create(move(y_positions), values_list.separator()));
} else {
set_longhand_property(CSS::PropertyID::BackgroundPositionX, value);
set_longhand_property(CSS::PropertyID::BackgroundPositionY, value);
}
return;
}
if (property_id == CSS::PropertyID::Inset) {
if (value.is_value_list()) {
auto const& values_list = value.as_value_list();
assign_edge_values(PropertyID::Top, PropertyID::Right, PropertyID::Bottom, PropertyID::Left, values_list.values());
return;
}
set_longhand_property(CSS::PropertyID::Top, value);
set_longhand_property(CSS::PropertyID::Right, value);
set_longhand_property(CSS::PropertyID::Bottom, value);
set_longhand_property(CSS::PropertyID::Left, value);
return;
}
if (property_id == CSS::PropertyID::Margin) {
if (value.is_value_list()) {
auto const& values_list = value.as_value_list();
assign_edge_values(PropertyID::MarginTop, PropertyID::MarginRight, PropertyID::MarginBottom, PropertyID::MarginLeft, values_list.values());
return;
}
set_longhand_property(CSS::PropertyID::MarginTop, value);
set_longhand_property(CSS::PropertyID::MarginRight, value);
set_longhand_property(CSS::PropertyID::MarginBottom, value);
set_longhand_property(CSS::PropertyID::MarginLeft, value);
return;
}
if (property_id == CSS::PropertyID::Padding) {
if (value.is_value_list()) {
auto const& values_list = value.as_value_list();
assign_edge_values(PropertyID::PaddingTop, PropertyID::PaddingRight, PropertyID::PaddingBottom, PropertyID::PaddingLeft, values_list.values());
return;
}
set_longhand_property(CSS::PropertyID::PaddingTop, value);
set_longhand_property(CSS::PropertyID::PaddingRight, value);
set_longhand_property(CSS::PropertyID::PaddingBottom, value);
set_longhand_property(CSS::PropertyID::PaddingLeft, value);
return;
}
if (property_id == CSS::PropertyID::Gap || property_id == CSS::PropertyID::GridGap) {
if (value.is_value_list()) {
auto const& values_list = value.as_value_list();
set_longhand_property(CSS::PropertyID::RowGap, values_list.values()[0]);
set_longhand_property(CSS::PropertyID::ColumnGap, values_list.values()[1]);
return;
}
set_longhand_property(CSS::PropertyID::RowGap, value);
set_longhand_property(CSS::PropertyID::ColumnGap, value);
return;
}
if (property_id == CSS::PropertyID::RowGap || property_id == CSS::PropertyID::GridRowGap) {
set_longhand_property(CSS::PropertyID::RowGap, value);
return;
}
if (property_id == CSS::PropertyID::ColumnGap || property_id == CSS::PropertyID::GridColumnGap) {
set_longhand_property(CSS::PropertyID::ColumnGap, value);
return;
}
if (property_id == CSS::PropertyID::MaxInlineSize || property_id == CSS::PropertyID::MinInlineSize) {
// FIXME: Use writing-mode to determine if we should set width or height.
bool is_horizontal = true;
if (is_horizontal) {
if (property_id == CSS::PropertyID::MaxInlineSize) {
set_longhand_property(CSS::PropertyID::MaxWidth, value);
} else {
set_longhand_property(CSS::PropertyID::MinWidth, value);
}
} else {
if (property_id == CSS::PropertyID::MaxInlineSize) {
set_longhand_property(CSS::PropertyID::MaxHeight, value);
} else {
set_longhand_property(CSS::PropertyID::MinHeight, value);
}
}
return;
}
if (property_is_shorthand(property_id)) {
// ShorthandStyleValue was handled already.
// That means if we got here, that `value` must be a CSS-wide keyword, which we should apply to our longhand properties.
// We don't directly call `set_longhand_property()` because the longhands might have longhands of their own.
// (eg `grid` -> `grid-template` -> `grid-template-areas` & `grid-template-rows` & `grid-template-columns`)
VERIFY(value.is_css_wide_keyword());
for (auto longhand : longhands_for_shorthand(property_id))
for_each_property_expanding_shorthands(longhand, value, set_longhand_property);
return;
}
set_longhand_property(property_id, value);
}
void StyleComputer::set_property_expanding_shorthands(StyleProperties& style, CSS::PropertyID property_id, StyleValue const& value, CSS::CSSStyleDeclaration const* declaration, StyleProperties::PropertyValues const& properties_for_revert)
{
for_each_property_expanding_shorthands(property_id, value, [&](PropertyID shorthand_id, StyleValue const& shorthand_value) {
if (shorthand_value.is_revert()) {
auto& property_in_previous_cascade_origin = properties_for_revert[to_underlying(shorthand_id)];
if (property_in_previous_cascade_origin.has_value())
style.set_property(shorthand_id, property_in_previous_cascade_origin->style, property_in_previous_cascade_origin->declaration);
} else {
style.set_property(shorthand_id, shorthand_value, declaration);
}
});
}
void StyleComputer::set_all_properties(DOM::Element& element, Optional<CSS::Selector::PseudoElement::Type> pseudo_element, StyleProperties& style, StyleValue const& value, DOM::Document& document, CSS::CSSStyleDeclaration const* declaration, StyleProperties::PropertyValues const& properties_for_revert) const
{
for (auto i = to_underlying(CSS::first_longhand_property_id); i <= to_underlying(CSS::last_longhand_property_id); ++i) {
auto property_id = (CSS::PropertyID)i;
if (value.is_revert()) {
style.m_property_values[to_underlying(property_id)] = properties_for_revert[to_underlying(property_id)];
continue;
}
if (value.is_unset()) {
if (is_inherited_property(property_id))
style.m_property_values[to_underlying(property_id)] = { { get_inherit_value(document.realm(), property_id, &element, pseudo_element), nullptr } };
else
style.m_property_values[to_underlying(property_id)] = { { property_initial_value(document.realm(), property_id), nullptr } };
continue;
}
NonnullRefPtr<StyleValue> property_value = value;
if (property_value->is_unresolved())
property_value = Parser::Parser::resolve_unresolved_style_value({}, Parser::ParsingContext { document }, element, pseudo_element, property_id, property_value->as_unresolved());
if (!property_value->is_unresolved())
set_property_expanding_shorthands(style, property_id, property_value, declaration, properties_for_revert);
set_property_expanding_shorthands(style, property_id, value, declaration, properties_for_revert);
}
}
void StyleComputer::cascade_declarations(StyleProperties& style, DOM::Element& element, Optional<CSS::Selector::PseudoElement::Type> pseudo_element, Vector<MatchingRule> const& matching_rules, CascadeOrigin cascade_origin, Important important) const
{
auto properties_for_revert = style.properties();
for (auto const& match : matching_rules) {
for (auto const& property : verify_cast<PropertyOwningCSSStyleDeclaration>(match.rule->declaration()).properties()) {
if (important != property.important)
continue;
if (property.property_id == CSS::PropertyID::All) {
set_all_properties(element, pseudo_element, style, property.value, m_document, &match.rule->declaration(), properties_for_revert);
continue;
}
auto property_value = property.value;
if (property.value->is_unresolved())
property_value = Parser::Parser::resolve_unresolved_style_value({}, Parser::ParsingContext { document() }, element, pseudo_element, property.property_id, property.value->as_unresolved());
if (!property_value->is_unresolved())
set_property_expanding_shorthands(style, property.property_id, property_value, &match.rule->declaration(), properties_for_revert);
}
}
if (cascade_origin == CascadeOrigin::Author && !pseudo_element.has_value()) {
if (auto const* inline_style = verify_cast<ElementInlineCSSStyleDeclaration>(element.inline_style())) {
for (auto const& property : inline_style->properties()) {
if (important != property.important)
continue;
if (property.property_id == CSS::PropertyID::All) {
set_all_properties(element, pseudo_element, style, property.value, m_document, inline_style, properties_for_revert);
continue;
}
auto property_value = property.value;
if (property.value->is_unresolved())
property_value = Parser::Parser::resolve_unresolved_style_value({}, Parser::ParsingContext { document() }, element, pseudo_element, property.property_id, property.value->as_unresolved());
if (!property_value->is_unresolved())
set_property_expanding_shorthands(style, property.property_id, property_value, inline_style, properties_for_revert);
}
}
}
}
static ErrorOr<void> cascade_custom_properties(DOM::Element& element, Optional<CSS::Selector::PseudoElement::Type> pseudo_element, Vector<MatchingRule> const& matching_rules)
{
size_t needed_capacity = 0;
for (auto const& matching_rule : matching_rules)
needed_capacity += verify_cast<PropertyOwningCSSStyleDeclaration>(matching_rule.rule->declaration()).custom_properties().size();
if (!pseudo_element.has_value()) {
if (auto const* inline_style = verify_cast<PropertyOwningCSSStyleDeclaration>(element.inline_style()))
needed_capacity += inline_style->custom_properties().size();
}
HashMap<FlyString, StyleProperty> custom_properties;
TRY(custom_properties.try_ensure_capacity(needed_capacity));
for (auto const& matching_rule : matching_rules) {
for (auto const& it : verify_cast<PropertyOwningCSSStyleDeclaration>(matching_rule.rule->declaration()).custom_properties())
custom_properties.set(it.key, it.value);
}
if (!pseudo_element.has_value()) {
if (auto const* inline_style = verify_cast<PropertyOwningCSSStyleDeclaration>(element.inline_style())) {
for (auto const& it : inline_style->custom_properties())
custom_properties.set(it.key, it.value);
}
}
element.set_custom_properties(pseudo_element, move(custom_properties));
return {};
}
template<typename T>
static T interpolate_raw(T from, T to, float delta)
{
if constexpr (IsSame<T, double>) {
return from + (to - from) * static_cast<double>(delta);
} else {
return static_cast<RemoveCVReference<T>>(from + (to - from) * delta);
}
}
static ErrorOr<NonnullRefPtr<StyleValue const>> interpolate_transform(DOM::Element& element, StyleValue const& from, StyleValue const& to, float delta)
{
// Note that the spec uses column-major notation, so all the matrix indexing is reversed.
static constexpr auto make_transformation = [](TransformationStyleValue const& transformation) -> ErrorOr<Transformation> {
Vector<TransformValue> values;
for (auto const& value : transformation.values()) {
switch (value->type()) {
case StyleValue::Type::Angle:
values.append(AngleOrCalculated { value->as_angle().angle() });
break;
case StyleValue::Type::Calculated:
values.append(AngleOrCalculated { value->as_calculated() });
break;
case StyleValue::Type::Length:
values.append(LengthPercentage { value->as_length().length() });
break;
case StyleValue::Type::Percentage:
values.append(LengthPercentage { value->as_percentage().percentage() });
break;
case StyleValue::Type::Number:
values.append(NumberPercentage { Number(Number::Type::Number, value->as_number().number()) });
break;
default:
return Error::from_string_literal("Transform contains unsupported style value");
}
}
return Transformation { transformation.transform_function(), move(values) };
};
static constexpr auto transformation_style_value_to_matrix = [](DOM::Element& element, TransformationStyleValue const& value) -> ErrorOr<FloatMatrix4x4> {
auto transformation = TRY(make_transformation(value.as_transformation()));
Optional<Painting::PaintableBox const&> paintable_box;
if (auto layout_node = element.layout_node()) {
if (auto paintable = layout_node->paintable(); paintable && is<Painting::PaintableBox>(paintable))
paintable_box = *static_cast<Painting::PaintableBox*>(paintable);
}
return transformation.to_matrix(paintable_box);
};
static constexpr auto style_value_to_matrix = [](DOM::Element& element, StyleValue const& value) -> ErrorOr<FloatMatrix4x4> {
if (value.to_identifier() == ValueID::None)
return FloatMatrix4x4::identity();
if (value.is_transformation())
return transformation_style_value_to_matrix(element, value.as_transformation());
VERIFY(value.is_value_list());
auto matrix = FloatMatrix4x4::identity();
for (auto const& value_element : value.as_value_list().values()) {
if (value_element->is_transformation())
matrix = matrix * TRY(transformation_style_value_to_matrix(element, value_element->as_transformation()));
}
return matrix;
};
struct DecomposedValues {
FloatVector3 translation;
FloatVector3 scale;
FloatVector3 skew;
FloatVector4 rotation;
FloatVector4 perspective;
};
// https://drafts.csswg.org/css-transforms-2/#decomposing-a-3d-matrix
static constexpr auto decompose = [](FloatMatrix4x4 matrix) -> ErrorOr<DecomposedValues> {
// https://drafts.csswg.org/css-transforms-1/#supporting-functions
static constexpr auto combine = [](auto a, auto b, float ascl, float bscl) {
return FloatVector3 {
ascl * a[0] + bscl * b[0],
ascl * a[1] + bscl * b[1],
ascl * a[2] + bscl * b[2],
};
};
// Normalize the matrix.
if (matrix(3, 3) == 0.f)
return Error::from_string_literal("Cannot interpolate non-invertible matrix");
for (int i = 0; i < 4; i++)
for (int j = 0; j < 4; j++)
matrix(i, j) /= matrix(3, 3);
// perspectiveMatrix is used to solve for perspective, but it also provides
// an easy way to test for singularity of the upper 3x3 component.
auto perspective_matrix = matrix;
for (int i = 0; i < 3; i++)
perspective_matrix(3, i) = 0.f;
perspective_matrix(3, 3) = 1.f;
if (!perspective_matrix.is_invertible())
return Error::from_string_literal("Cannot interpolate non-invertible matrix");
DecomposedValues values;
// First, isolate perspective.
if (matrix(3, 0) != 0.f || matrix(3, 1) != 0.f || matrix(3, 2) != 0.f) {
// rightHandSide is the right hand side of the equation.
// Note: It is the bottom side in a row-major matrix
FloatVector4 bottom_side = {
matrix(3, 0),
matrix(3, 1),
matrix(3, 2),
matrix(3, 3),
};
// Solve the equation by inverting perspectiveMatrix and multiplying
// rightHandSide by the inverse.
auto inverse_perspective_matrix = perspective_matrix.inverse();
auto transposed_inverse_perspective_matrix = inverse_perspective_matrix.transpose();
values.perspective = transposed_inverse_perspective_matrix * bottom_side;
} else {
// No perspective.
values.perspective = { 0.0, 0.0, 0.0, 1.0 };
}
// Next take care of translation
for (int i = 0; i < 3; i++)
values.translation[i] = matrix(i, 3);
// Now get scale and shear. 'row' is a 3 element array of 3 component vectors
FloatVector3 row[3];
for (int i = 0; i < 3; i++)
row[i] = { matrix(0, i), matrix(1, i), matrix(2, i) };
// Compute X scale factor and normalize first row.
values.scale[0] = row[0].length();
row[0].normalize();
// Compute XY shear factor and make 2nd row orthogonal to 1st.
values.skew[0] = row[0].dot(row[1]);
row[1] = combine(row[1], row[0], 1.f, -values.skew[0]);
// Now, compute Y scale and normalize 2nd row.
values.scale[1] = row[1].length();
row[1].normalize();
values.skew[0] /= values.scale[1];
// Compute XZ and YZ shears, orthogonalize 3rd row
values.skew[1] = row[0].dot(row[2]);
row[2] = combine(row[2], row[0], 1.f, -values.skew[1]);
values.skew[2] = row[1].dot(row[2]);
row[2] = combine(row[2], row[1], 1.f, -values.skew[2]);
// Next, get Z scale and normalize 3rd row.
values.scale[2] = row[2].length();
row[2].normalize();
values.skew[1] /= values.scale[2];
values.skew[2] /= values.scale[2];
// At this point, the matrix (in rows) is orthonormal.
// Check for a coordinate system flip. If the determinant
// is -1, then negate the matrix and the scaling factors.
auto pdum3 = row[1].cross(row[2]);
if (row[0].dot(pdum3) < 0.f) {
for (int i = 0; i < 3; i++) {
values.scale[i] *= -1.f;
row[i][0] *= -1.f;
row[i][1] *= -1.f;
row[i][2] *= -1.f;
}
}
// Now, get the rotations out
values.rotation[0] = 0.5f * sqrt(max(1.f + row[0][0] - row[1][1] - row[2][2], 0.f));
values.rotation[1] = 0.5f * sqrt(max(1.f - row[0][0] + row[1][1] - row[2][2], 0.f));
values.rotation[2] = 0.5f * sqrt(max(1.f - row[0][0] - row[1][1] + row[2][2], 0.f));
values.rotation[3] = 0.5f * sqrt(max(1.f + row[0][0] + row[1][1] + row[2][2], 0.f));
if (row[2][1] > row[1][2])
values.rotation[0] = -values.rotation[0];
if (row[0][2] > row[2][0])
values.rotation[1] = -values.rotation[1];
if (row[1][0] > row[0][1])
values.rotation[2] = -values.rotation[2];
// FIXME: This accounts for the fact that the browser coordinate system is left-handed instead of right-handed.
// The reason for this is that the positive Y-axis direction points down instead of up. To fix this, we
// invert the Y axis. However, it feels like the spec pseudo-code above should have taken something like
// this into account, so we're probably doing something else wrong.
values.rotation[2] *= -1;
return values;
};
// https://drafts.csswg.org/css-transforms-2/#recomposing-to-a-3d-matrix
static constexpr auto recompose = [](DecomposedValues const& values) -> FloatMatrix4x4 {
auto matrix = FloatMatrix4x4::identity();
// apply perspective
for (int i = 0; i < 4; i++)
matrix(3, i) = values.perspective[i];
// apply translation
for (int i = 0; i < 4; i++) {
for (int j = 0; j < 3; j++)
matrix(i, 3) += values.translation[j] * matrix(i, j);
}
// apply rotation
auto x = values.rotation[0];
auto y = values.rotation[1];
auto z = values.rotation[2];
auto w = values.rotation[3];
// Construct a composite rotation matrix from the quaternion values
// rotationMatrix is a identity 4x4 matrix initially
auto rotation_matrix = FloatMatrix4x4::identity();
rotation_matrix(0, 0) = 1.f - 2.f * (y * y + z * z);
rotation_matrix(1, 0) = 2.f * (x * y - z * w);
rotation_matrix(2, 0) = 2.f * (x * z + y * w);
rotation_matrix(0, 1) = 2.f * (x * y + z * w);
rotation_matrix(1, 1) = 1.f - 2.f * (x * x + z * z);
rotation_matrix(2, 1) = 2.f * (y * z - x * w);
rotation_matrix(0, 2) = 2.f * (x * z - y * w);
rotation_matrix(1, 2) = 2.f * (y * z + x * w);
rotation_matrix(2, 2) = 1.f - 2.f * (x * x + y * y);
matrix = matrix * rotation_matrix;
// apply skew
// temp is a identity 4x4 matrix initially
auto temp = FloatMatrix4x4::identity();
if (values.skew[2] != 0.f) {
temp(1, 2) = values.skew[2];
matrix = matrix * temp;
}