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Remove concept of Layers from Servo

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Layers were a feature of the legacy drawing path. If we re-add them at
some point, it probably makes more sense to make them a product of
display list inspection.

This change also remove a bunch of dead painting code.
This commit is contained in:
Martin Robinson 2016-10-19 15:14:02 +02:00
parent e667e62f0c
commit ccb7ab926a
21 changed files with 57 additions and 745 deletions
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47
components/layout/fragment.rs
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@ -17,7 +17,7 @@ use gfx;
use gfx::display_list::{BLUR_INFLATION_FACTOR, OpaqueNode};
use gfx::text::glyph::ByteIndex;
use gfx::text::text_run::{TextRun, TextRunSlice};
use gfx_traits::{FragmentType, LayerId, LayerType, StackingContextId};
use gfx_traits::{FragmentType, StackingContextId};
use inline::{FIRST_FRAGMENT_OF_ELEMENT, InlineFragmentContext, InlineFragmentNodeInfo};
use inline::{InlineMetrics, LAST_FRAGMENT_OF_ELEMENT, LineMetrics};
use ipc_channel::ipc::IpcSender;
@ -48,7 +48,7 @@ use style::dom::TRestyleDamage;
use style::logical_geometry::{LogicalMargin, LogicalRect, LogicalSize, WritingMode};
use style::properties::ServoComputedValues;
use style::str::char_is_whitespace;
use style::values::computed::{LengthOrPercentage, LengthOrPercentageOrAuto};
use style::values::computed::{LengthOrNone, LengthOrPercentage, LengthOrPercentageOrAuto};
use style::values::computed::LengthOrPercentageOrNone;
use text;
use text::TextRunScanner;
@ -122,9 +122,6 @@ pub struct Fragment {
/// The pseudo-element that this fragment represents.
pub pseudo: PseudoElementType<()>,
/// Various flags for this fragment.
pub flags: FragmentFlags,
/// A debug ID that is consistent for the life of this fragment (via transform etc).
/// This ID should not be considered stable across multiple layouts or fragment
/// manipulations.
@ -919,7 +916,6 @@ impl Fragment {
specific: specific,
inline_context: None,
pseudo: node.get_pseudo_element_type().strip(),
flags: FragmentFlags::empty(),
debug_id: DebugId::new(),
stacking_context_id: StackingContextId::new(0),
}
@ -948,7 +944,6 @@ impl Fragment {
specific: specific,
inline_context: None,
pseudo: pseudo,
flags: FragmentFlags::empty(),
debug_id: DebugId::new(),
stacking_context_id: StackingContextId::new(0),
}
@ -976,7 +971,6 @@ impl Fragment {
specific: info,
inline_context: self.inline_context.clone(),
pseudo: self.pseudo.clone(),
flags: FragmentFlags::empty(),
debug_id: self.debug_id.clone(),
stacking_context_id: StackingContextId::new(0),
}
@ -2535,9 +2529,6 @@ impl Fragment {
_ => {}
}
if self.flags.contains(HAS_LAYER) {
return true
}
if self.style().get_effects().opacity != 1.0 {
return true
}
@ -2550,6 +2541,18 @@ impl Fragment {
if self.style().get_effects().transform.0.is_some() {
return true
}
// TODO(mrobinson): Determine if this is necessary, since blocks with
// transformations already create stacking contexts.
if self.style().get_effects().perspective != LengthOrNone::None {
return true
}
// Fixed position blocks always create stacking contexts.
if self.style.get_box().position == position::T::fixed {
return true
}
match self.style().get_used_transform_style() {
transform_style::T::flat | transform_style::T::preserve_3d => {
return true
@ -2874,21 +2877,6 @@ impl Fragment {
}
}
pub fn layer_id(&self) -> LayerId {
let layer_type = match self.pseudo {
PseudoElementType::Normal => LayerType::FragmentBody,
PseudoElementType::Before(_) => LayerType::BeforePseudoContent,
PseudoElementType::After(_) => LayerType::AfterPseudoContent,
PseudoElementType::DetailsSummary(_) => LayerType::FragmentBody,
PseudoElementType::DetailsContent(_) => LayerType::FragmentBody,
};
LayerId::new_of_type(layer_type, self.node.id() as usize)
}
pub fn layer_id_for_overflow_scroll(&self) -> LayerId {
LayerId::new_of_type(LayerType::OverflowScroll, self.node.id() as usize)
}
/// Returns true if any of the inline styles associated with this fragment have
/// `vertical-align` set to `top` or `bottom`.
pub fn is_vertically_aligned_to_top_or_bottom(&self) -> bool {
@ -3094,13 +3082,6 @@ impl Overflow {
}
}
bitflags! {
pub flags FragmentFlags: u8 {
/// Whether this fragment has a layer.
const HAS_LAYER = 0x01,
}
}
/// Specified distances from the margin edge of a block to its content in the inline direction.
/// These are returned by `guess_inline_content_edge_offsets()` and are used in the float placement
/// speculation logic.