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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
tree | f435a8308119effd964b339f76abb83a57c29483 /servo/components/style/gecko/restyle_damage.rs | |
parent | Initial commit. (diff) | |
download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'servo/components/style/gecko/restyle_damage.rs')
-rw-r--r-- | servo/components/style/gecko/restyle_damage.rs | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/servo/components/style/gecko/restyle_damage.rs b/servo/components/style/gecko/restyle_damage.rs new file mode 100644 index 0000000000..4749daea18 --- /dev/null +++ b/servo/components/style/gecko/restyle_damage.rs @@ -0,0 +1,121 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at https://mozilla.org/MPL/2.0/. */ + +//! Gecko's restyle damage computation (aka change hints, aka `nsChangeHint`). + +use crate::gecko_bindings::bindings; +use crate::gecko_bindings::structs; +use crate::gecko_bindings::structs::nsChangeHint; +use crate::matching::{StyleChange, StyleDifference}; +use crate::properties::ComputedValues; +use std::ops::{BitAnd, BitOr, BitOrAssign, Not}; + +/// The representation of Gecko's restyle damage is just a wrapper over +/// `nsChangeHint`. +#[derive(Clone, Copy, Debug, PartialEq)] +pub struct GeckoRestyleDamage(nsChangeHint); + +impl GeckoRestyleDamage { + /// Trivially construct a new `GeckoRestyleDamage`. + #[inline] + pub fn new(raw: nsChangeHint) -> Self { + GeckoRestyleDamage(raw) + } + + /// Get the inner change hint for this damage. + #[inline] + pub fn as_change_hint(&self) -> nsChangeHint { + self.0 + } + + /// Get an empty change hint, that is (`nsChangeHint(0)`). + #[inline] + pub fn empty() -> Self { + GeckoRestyleDamage(nsChangeHint(0)) + } + + /// Returns whether this restyle damage represents the empty damage. + #[inline] + pub fn is_empty(&self) -> bool { + self.0 == nsChangeHint(0) + } + + /// Computes the `StyleDifference` (including the appropriate change hint) + /// given an old and a new style. + pub fn compute_style_difference( + old_style: &ComputedValues, + new_style: &ComputedValues, + ) -> StyleDifference { + let mut any_style_changed = false; + let mut reset_only = false; + let hint = unsafe { + bindings::Gecko_CalcStyleDifference( + old_style.as_gecko_computed_style(), + new_style.as_gecko_computed_style(), + &mut any_style_changed, + &mut reset_only, + ) + }; + if reset_only && !old_style.custom_properties_equal(new_style) { + // The Gecko_CalcStyleDifference call only checks the non-custom + // property structs, so we check the custom properties here. Since + // they generate no damage themselves, we can skip this check if we + // already know we had some inherited (regular) property + // differences. + any_style_changed = true; + reset_only = false; + } + let change = if any_style_changed { + StyleChange::Changed { reset_only } + } else { + StyleChange::Unchanged + }; + let damage = GeckoRestyleDamage(nsChangeHint(hint)); + StyleDifference { damage, change } + } + + /// Returns true if this restyle damage contains all the damage of |other|. + pub fn contains(self, other: Self) -> bool { + self & other == other + } + + /// Gets restyle damage to reconstruct the entire frame, subsuming all + /// other damage. + pub fn reconstruct() -> Self { + GeckoRestyleDamage(structs::nsChangeHint::nsChangeHint_ReconstructFrame) + } +} + +impl Default for GeckoRestyleDamage { + fn default() -> Self { + Self::empty() + } +} + +impl BitOr for GeckoRestyleDamage { + type Output = Self; + fn bitor(self, other: Self) -> Self { + GeckoRestyleDamage(self.0 | other.0) + } +} + +impl BitOrAssign for GeckoRestyleDamage { + fn bitor_assign(&mut self, other: Self) { + *self = *self | other; + } +} + +impl BitAnd for GeckoRestyleDamage { + type Output = Self; + fn bitand(self, other: Self) -> Self { + GeckoRestyleDamage(nsChangeHint((self.0).0 & (other.0).0)) + } +} + +impl Not for GeckoRestyleDamage { + type Output = Self; + fn not(self) -> Self { + GeckoRestyleDamage(nsChangeHint(!(self.0).0)) + } +} |