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LibWeb: Transition StyleComputer to Web Animations

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With this commit, we are finally running animations off of the web
animations spec! A lot of the work StyleComputer is doing is now done
elsewhere. For example, fill-forward animations are handled by
Animation::is_relevant() returning true in the after phase, meaning the
"active_state_if_fill_forward" map is no longer needed.
This commit is contained in:
Matthew Olsson 2024-02-22 13:56:15 +00:00 • committed by Andreas Kling
parent b258ba2767
commit ae3326a447
7 changed files with 270 additions and 647 deletions
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114
Userland/Libraries/LibWeb/CSS/StyleComputer.h
View file

@ -10,7 +10,7 @@
#include <AK/HashMap.h>
#include <AK/Optional.h>
#include <AK/OwnPtr.h>
#include <AK/RedBlackTree.h>
#include <LibWeb/Animations/KeyframeEffect.h>
#include <LibWeb/CSS/CSSFontFaceRule.h>
#include <LibWeb/CSS/CSSKeyframesRule.h>
#include <LibWeb/CSS/CSSStyleDeclaration.h>
@ -73,42 +73,6 @@ public:
RefPtr<Gfx::FontCascadeList const> compute_font_for_style_values(DOM::Element const* element, Optional<CSS::Selector::PseudoElement::Type> pseudo_element, StyleValue const& font_family, StyleValue const& font_size, StyleValue const& font_style, StyleValue const& font_weight, StyleValue const& font_stretch, int math_depth = 0) const;
struct AnimationKey {
CSS::CSSStyleDeclaration const* source_declaration;
DOM::Element const* element;
};
struct AnimationTiming {
struct Linear { };
struct CubicBezier {
// Regular parameters
double x1;
double y1;
double x2;
double y2;
struct CachedSample {
double x;
double y;
double t;
};
mutable Vector<CachedSample, 64> m_cached_x_samples = {};
CachedSample sample_around(double x) const;
bool operator==(CubicBezier const& other) const
{
return x1 == other.x1 && y1 == other.y1 && x2 == other.x2 && y2 == other.y2;
}
};
struct Steps {
size_t number_of_steps;
bool jump_at_start;
bool jump_at_end;
};
Variant<Linear, CubicBezier, Steps> timing_function;
};
void set_viewport_rect(Badge<DOM::Document>, CSSPixelRect const& viewport_rect) { m_viewport_rect = viewport_rect; }
private:
@ -156,28 +120,20 @@ private:
JS::NonnullGCPtr<DOM::Document> m_document;
struct AnimationKeyFrameSet {
struct ResolvedKeyFrame {
struct UseInitial { };
Array<Variant<Empty, UseInitial, NonnullRefPtr<StyleValue const>>, to_underlying(last_property_id) + 1> resolved_properties {};
};
RedBlackTree<u64, ResolvedKeyFrame> keyframes_by_key;
};
struct RuleCache {
HashMap<FlyString, Vector<MatchingRule>> rules_by_id;
HashMap<FlyString, Vector<MatchingRule>> rules_by_class;
HashMap<FlyString, Vector<MatchingRule>> rules_by_tag_name;
Vector<MatchingRule> other_rules;
HashMap<FlyString, NonnullOwnPtr<AnimationKeyFrameSet>> rules_by_animation_keyframes;
HashMap<FlyString, NonnullRefPtr<Animations::KeyframeEffect::KeyFrameSet>> rules_by_animation_keyframes;
};
NonnullOwnPtr<RuleCache> make_rule_cache_for_cascade_origin(CascadeOrigin);
RuleCache const& rule_cache_for_cascade_origin(CascadeOrigin) const;
void ensure_animation_timer() const;
ErrorOr<void> collect_animation_into(JS::NonnullGCPtr<Animations::KeyframeEffect> animation, StyleProperties& style_properties) const;
OwnPtr<RuleCache> m_author_rule_cache;
OwnPtr<RuleCache> m_user_rule_cache;
@ -190,71 +146,7 @@ private:
Length::FontMetrics m_default_font_metrics;
Length::FontMetrics m_root_element_font_metrics;
constexpr static u64 AnimationKeyFrameKeyScaleFactor = 1000; // 0..100000
enum class AnimationStepTransition {
NoTransition,
IdleOrBeforeToActive,
IdleOrBeforeToAfter,
ActiveToBefore,
ActiveToActiveChangingTheIteration,
ActiveToAfter,
AfterToActive,
AfterToBefore,
Cancelled,
};
enum class AnimationState {
Before,
After,
Idle,
Active,
};
struct AnimationStateSnapshot {
Array<RefPtr<StyleValue const>, to_underlying(last_property_id) + 1> state;
};
struct Animation {
String name;
Optional<CSS::Time> duration; // "auto" if not set.
CSS::Time delay;
Optional<size_t> iteration_count; // Infinite if not set.
AnimationTiming timing_function;
CSS::AnimationDirection direction;
CSS::AnimationFillMode fill_mode;
WeakPtr<DOM::Element> owning_element;
CSS::Percentage progress { 0 };
CSS::Time remaining_delay { 0, CSS::Time::Type::Ms };
AnimationState current_state { AnimationState::Before };
size_t current_iteration { 1 };
mutable AnimationStateSnapshot initial_state {};
mutable OwnPtr<AnimationStateSnapshot> active_state_if_fill_forward {};
AnimationStepTransition step(CSS::Time const& time_step);
ErrorOr<void> collect_into(StyleProperties&, RuleCache const&) const;
bool is_done() const;
private:
float compute_output_progress(float input_progress) const;
bool is_animating_backwards() const;
};
mutable HashMap<AnimationKey, NonnullOwnPtr<Animation>> m_active_animations;
mutable HashMap<AnimationKey, OwnPtr<AnimationStateSnapshot>> m_finished_animations; // If fill-mode is forward/both, this is non-null and contains the final state.
mutable RefPtr<Platform::Timer> m_animation_driver_timer;
CSSPixelRect m_viewport_rect;
};
}
template<>
struct AK::Traits<Web::CSS::StyleComputer::AnimationKey> : public AK::DefaultTraits<Web::CSS::StyleComputer::AnimationKey> {
static unsigned hash(Web::CSS::StyleComputer::AnimationKey const& k) { return pair_int_hash(ptr_hash(k.source_declaration), ptr_hash(k.element)); }
static bool equals(Web::CSS::StyleComputer::AnimationKey const& a, Web::CSS::StyleComputer::AnimationKey const& b)
{
return a.element == b.element && a.source_declaration == b.source_declaration;
}
};