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78 lines
3.1 KiB
Rust
78 lines
3.1 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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use style::ComputedValues;
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bitflags! {
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#[doc = "Individual layout actions that may be necessary after restyling."]
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flags RestyleDamage: int {
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#[doc = "Repaint the node itself."]
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#[doc = "Currently unused; need to decide how this propagates."]
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static Repaint = 0x01,
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#[doc = "Recompute intrinsic inline_sizes (minimum and preferred)."]
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#[doc = "Propagates down the flow tree because the computation is"]
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#[doc = "bottom-up."]
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static BubbleISizes = 0x02,
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#[doc = "Recompute actual inline_sizes and block_sizes."]
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#[doc = "Propagates up the flow tree because the computation is"]
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#[doc = "top-down."]
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static Reflow = 0x04
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}
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}
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impl RestyleDamage {
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/// Elements of self which should also get set on any ancestor flow.
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pub fn propagate_up(self) -> RestyleDamage {
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self & Reflow
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}
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/// Elements of self which should also get set on any child flows.
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pub fn propagate_down(self) -> RestyleDamage {
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self & BubbleISizes
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}
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}
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// NB: We need the braces inside the RHS due to Rust #8012. This particular
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// version of this macro might be safe anyway, but we want to avoid silent
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// breakage on modifications.
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macro_rules! add_if_not_equal(
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($old:ident, $new:ident, $damage:ident,
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[ $($effect:ident),* ], [ $($style_struct_getter:ident.$name:ident),* ]) => ({
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if $( ($old.$style_struct_getter().$name != $new.$style_struct_getter().$name) )||* {
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$damage.insert($($effect)|*);
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}
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})
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)
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pub fn compute_damage(old: &ComputedValues, new: &ComputedValues) -> RestyleDamage {
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let mut damage = RestyleDamage::empty();
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// This checks every CSS property, as enumerated in
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// impl<'self> CssComputedStyle<'self>
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// in src/support/netsurfcss/rust-netsurfcss/netsurfcss.rc.
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// FIXME: We can short-circuit more of this.
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add_if_not_equal!(old, new, damage, [ Repaint ],
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[ get_color.color, get_background.background_color,
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get_border.border_top_color, get_border.border_right_color,
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get_border.border_bottom_color, get_border.border_left_color ]);
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add_if_not_equal!(old, new, damage, [ Repaint, BubbleISizes, Reflow ],
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[ get_border.border_top_width, get_border.border_right_width,
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get_border.border_bottom_width, get_border.border_left_width,
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get_margin.margin_top, get_margin.margin_right,
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get_margin.margin_bottom, get_margin.margin_left,
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get_padding.padding_top, get_padding.padding_right,
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get_padding.padding_bottom, get_padding.padding_left,
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get_box.position, get_box.width, get_box.height, get_box.float, get_box.display,
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get_font.font_family, get_font.font_size, get_font.font_style, get_font.font_weight,
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get_inheritedtext.text_align, get_text.text_decoration, get_inheritedbox.line_height ]);
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// FIXME: test somehow that we checked every CSS property
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damage
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}
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