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layout: Implement mix-blend-mode per COMPOSITING § 3.4.1.

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`background-blend-mode` is not yet supported because we don't support
multiple backgrounds yet.
This commit is contained in:
Patrick Walton 2015-01-08 13:53:17 -08:00
parent 3897547bc2
commit 97d3443003
10 changed files with 181 additions and 23 deletions
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9
components/layout/fragment.rs
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@ -44,9 +44,9 @@ use std::sync::{Arc, Mutex};
use string_cache::Atom;
use style::{ComputedValues, TElement, TNode, cascade_anonymous};
use style::computed_values::{LengthOrPercentage, LengthOrPercentageOrAuto};
use style::computed_values::{LengthOrPercentageOrNone};
use style::computed_values::{clear, overflow_wrap, position, text_align, text_decoration};
use style::computed_values::{vertical_align, white_space, word_break};
use style::computed_values::{LengthOrPercentageOrNone, clear, mix_blend_mode, overflow_wrap};
use style::computed_values::{position, text_align, text_decoration, vertical_align, white_space};
use style::computed_values::{word_break};
use url::Url;
/// Fragments (`struct Fragment`) are the leaves of the layout tree. They cannot position
@ -1747,6 +1747,9 @@ impl Fragment {
if !self.style().get_effects().filter.is_empty() {
return true
}
if self.style().get_effects().mix_blend_mode != mix_blend_mode::T::normal {
return true
}
match self.style().get_box().position {
position::T::absolute | position::T::fixed => {
// FIXME(pcwalton): This should only establish a new stacking context when