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Bug 1615489 - Refactor GenericGradient for conic-gradient support. r=emilio

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Differential Revision: https://phabricator.services.mozilla.com/D62923

--HG--
extra : moz-landing-system : lando
This commit is contained in:
Tim Nguyen 2020-02-15 22:04:35 +00:00
parent 6d9fd9419f
commit c15714cbeb
9 changed files with 161 additions and 133 deletions
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2
layout/painting/nsCSSRenderingBorders.cpp
View File

@ -3707,7 +3707,7 @@ ImgDrawResult nsCSSBorderImageRenderer::CreateWebRenderCommands(
renderer.BuildWebRenderParameters(1.0, extendMode, stops, lineStart,
lineEnd, gradientRadius);
if (gradient.kind.IsLinear()) {
if (gradient.IsLinear()) {
LayoutDevicePoint startPoint =
LayoutDevicePoint(dest.origin.x, dest.origin.y) + lineStart;
LayoutDevicePoint endPoint =

57
layout/painting/nsCSSRenderingGradients.cpp
View File

@ -66,9 +66,9 @@ static Tuple<CSSPoint, CSSPoint> ComputeLinearGradientLine(
using X = StyleHorizontalPositionKeyword;
using Y = StyleVerticalPositionKeyword;
const StyleLineDirection& direction = aGradient.kind.AsLinear();
const StyleLineDirection& direction = aGradient.AsLinear().direction;
const bool isModern =
aGradient.compat_mode == StyleGradientCompatMode::Modern;
aGradient.AsLinear().compat_mode == StyleGradientCompatMode::Modern;
CSSPoint center(aBoxSize.width / 2, aBoxSize.height / 2);
switch (direction.tag) {
@ -154,9 +154,9 @@ static RadialGradientRadii ComputeRadialGradientRadii(const EndingShape& aShape,
// ellipse to use.
static Tuple<CSSPoint, CSSPoint, CSSCoord, CSSCoord> ComputeRadialGradientLine(
const StyleGradient& aGradient, const CSSSize& aBoxSize) {
const auto& radial = aGradient.kind.AsRadial();
const EndingShape& endingShape = radial._0;
const Position& position = radial._1;
const auto& radial = aGradient.AsRadial();
const EndingShape& endingShape = radial.shape;
const Position& position = radial.position;
CSSPoint start = ResolvePosition(position, aBoxSize);
// Compute gradient shape: the x and y radii of an ellipse.
@ -566,17 +566,19 @@ static Maybe<double> GetSpecifiedGradientPosition(
static nsTArray<ColorStop> ComputeColorStops(ComputedStyle* aComputedStyle,
const StyleGradient& aGradient,
CSSCoord aLineLength) {
MOZ_ASSERT(aGradient.items.Length() >= 2,
auto items = aGradient.IsLinear() ? aGradient.AsLinear().items.AsSpan()
: aGradient.AsRadial().items.AsSpan();
MOZ_ASSERT(items.Length() >= 2,
"The parser should reject gradients with less than two stops");
nsTArray<ColorStop> stops(aGradient.items.Length());
nsTArray<ColorStop> stops(items.Length());
// If there is a run of stops before stop i that did not have specified
// positions, then this is the index of the first stop in that run.
Maybe<size_t> firstUnsetPosition;
auto span = aGradient.items.AsSpan();
for (size_t i = 0; i < aGradient.items.Length(); ++i) {
const auto& stop = span[i];
for (size_t i = 0; i < items.Length(); ++i) {
const auto& stop = items[i];
double position;
Maybe<double> specifiedPosition =
@ -587,7 +589,7 @@ static nsTArray<ColorStop> ComputeColorStops(ComputedStyle* aComputedStyle,
} else if (i == 0) {
// First stop defaults to position 0.0
position = 0.0;
} else if (i == aGradient.items.Length() - 1) {
} else if (i == items.Length() - 1) {
// Last stop defaults to position 1.0
position = 1.0;
} else {
@ -641,7 +643,7 @@ nsCSSGradientRenderer nsCSSGradientRenderer::Create(
// the gradient.
CSSPoint lineStart, lineEnd;
CSSCoord radiusX = 0, radiusY = 0; // for radial gradients only
if (aGradient.kind.IsLinear()) {
if (aGradient.IsLinear()) {
Tie(lineStart, lineEnd) =
ComputeLinearGradientLine(aPresContext, aGradient, srcSize);
} else {
@ -699,10 +701,10 @@ void nsCSSGradientRenderer::Paint(gfxContext& aContext, const nsRect& aDest,
// between tiles, we can optimise away most of the work by converting to a
// repeating linear gradient and filling the whole destination rect at once.
bool forceRepeatToCoverTiles =
mGradient->kind.IsLinear() &&
mGradient->IsLinear() &&
(mLineStart.x == mLineEnd.x) != (mLineStart.y == mLineEnd.y) &&
aRepeatSize.width == aDest.width && aRepeatSize.height == aDest.height &&
!mGradient->repeating && !aSrc.IsEmpty() && !cellContainsFill;
!mGradient->AsLinear().repeating && !aSrc.IsEmpty() && !cellContainsFill;
gfxMatrix matrix;
if (forceRepeatToCoverTiles) {
@ -751,8 +753,8 @@ void nsCSSGradientRenderer::Paint(gfxContext& aContext, const nsRect& aDest,
// Eliminate negative-position stops if the gradient is radial.
double firstStop = mStops[0].mPosition;
if (!mGradient->kind.IsLinear() && firstStop < 0.0) {
if (mGradient->repeating) {
if (mGradient->IsRadial() && firstStop < 0.0) {
if (mGradient->AsRadial().repeating) {
// Choose an instance of the repeated pattern that gives us all positive
// stop-offsets.
double lastStop = mStops[mStops.Length() - 1].mPosition;
@ -805,7 +807,7 @@ void nsCSSGradientRenderer::Paint(gfxContext& aContext, const nsRect& aDest,
MOZ_ASSERT(firstStop >= 0.0, "Failed to fix stop offsets");
}
if (!mGradient->kind.IsLinear() && !mGradient->repeating) {
if (mGradient->IsRadial() && !mGradient->AsRadial().repeating) {
// Direct2D can only handle a particular class of radial gradients because
// of the way the it specifies gradients. Setting firstStop to 0, when we
// can, will help us stay on the fast path. Currently we don't do this
@ -823,13 +825,13 @@ void nsCSSGradientRenderer::Paint(gfxContext& aContext, const nsRect& aDest,
double stopEnd = lastStop;
double stopDelta = lastStop - firstStop;
bool zeroRadius =
!mGradient->kind.IsLinear() && (mRadiusX < 1e-6 || mRadiusY < 1e-6);
mGradient->IsRadial() && (mRadiusX < 1e-6 || mRadiusY < 1e-6);
if (stopDelta < 1e-6 || lineLength < 1e-6 || zeroRadius) {
// Stops are all at the same place. Map all stops to 0.0.
// For repeating radial gradients, or for any radial gradients with
// a zero radius, we need to fill with the last stop color, so just set
// both radii to 0.
if (mGradient->repeating || zeroRadius) {
if (mGradient->Repeating() || zeroRadius) {
mRadiusX = mRadiusY = 0.0;
}
stopDelta = 0.0;
@ -839,7 +841,7 @@ void nsCSSGradientRenderer::Paint(gfxContext& aContext, const nsRect& aDest,
// This keeps the gradient line as large as the box and doesn't
// lets us avoiding having to get padding correct for stops
// at 0 and 1
if (!mGradient->repeating || stopDelta == 0.0) {
if (!mGradient->Repeating() || stopDelta == 0.0) {
stopOrigin = std::min(stopOrigin, 0.0);
stopEnd = std::max(stopEnd, 1.0);
}
@ -849,7 +851,7 @@ void nsCSSGradientRenderer::Paint(gfxContext& aContext, const nsRect& aDest,
RefPtr<gfxPattern> gradientPattern;
gfxPoint gradientStart;
gfxPoint gradientEnd;
if (mGradient->kind.IsLinear()) {
if (mGradient->IsLinear()) {
// Compute the actual gradient line ends we need to pass to cairo after
// stops have been normalized.
gradientStart = mLineStart + (mLineEnd - mLineStart) * stopOrigin;
@ -868,6 +870,7 @@ void nsCSSGradientRenderer::Paint(gfxContext& aContext, const nsRect& aDest,
gradientPattern = new gfxPattern(gradientStart.x, gradientStart.y,
gradientEnd.x, gradientEnd.y);
} else {
MOZ_ASSERT(mGradient->IsRadial());
NS_ASSERTION(firstStop >= 0.0,
"Negative stops not allowed for radial gradients");
@ -912,7 +915,7 @@ void nsCSSGradientRenderer::Paint(gfxContext& aContext, const nsRect& aDest,
Color lastColor(mStops.LastElement().mColor);
mStops.Clear();
if (!mGradient->repeating && !zeroRadius) {
if (!mGradient->Repeating() && !zeroRadius) {
mStops.AppendElement(ColorStop(firstStop, false, firstColor));
}
mStops.AppendElement(ColorStop(firstStop, false, lastColor));
@ -920,7 +923,7 @@ void nsCSSGradientRenderer::Paint(gfxContext& aContext, const nsRect& aDest,
ResolvePremultipliedAlpha(mStops);
bool isRepeat = mGradient->repeating || forceRepeatToCoverTiles;
bool isRepeat = mGradient->Repeating() || forceRepeatToCoverTiles;
// Now set normalized color stops in pattern.
// Offscreen gradient surface cache (not a tile):
@ -1014,7 +1017,7 @@ void nsCSSGradientRenderer::Paint(gfxContext& aContext, const nsRect& aDest,
gfxRect dirtyFillRect = fillRect.Intersect(dirtyAreaToFill);
gfxRect fillRectRelativeToTile = dirtyFillRect - tileRect.TopLeft();
Color edgeColor;
if (mGradient->kind.IsLinear() && !isRepeat &&
if (mGradient->IsLinear() && !isRepeat &&
RectIsBeyondLinearGradientEdge(fillRectRelativeToTile, matrix, mStops,
gradientStart, gradientEnd,
&edgeColor)) {
@ -1118,7 +1121,8 @@ void nsCSSGradientRenderer::BuildWebRenderParameters(
float aOpacity, wr::ExtendMode& aMode, nsTArray<wr::GradientStop>& aStops,
LayoutDevicePoint& aLineStart, LayoutDevicePoint& aLineEnd,
LayoutDeviceSize& aGradientRadius) {
aMode = mGradient->repeating ? wr::ExtendMode::Repeat : wr::ExtendMode::Clamp;
aMode =
mGradient->Repeating() ? wr::ExtendMode::Repeat : wr::ExtendMode::Clamp;
aStops.SetLength(mStops.Length());
for (uint32_t i = 0; i < mStops.Length(); i++) {
@ -1184,7 +1188,7 @@ void nsCSSGradientRenderer::BuildWebRenderDisplayItems(
lineStart.x = (lineStart.x - srcTransform.x) * srcTransform.width;
lineStart.y = (lineStart.y - srcTransform.y) * srcTransform.height;
if (mGradient->kind.IsLinear()) {
if (mGradient->IsLinear()) {
lineEnd.x = (lineEnd.x - srcTransform.x) * srcTransform.width;
lineEnd.y = (lineEnd.y - srcTransform.y) * srcTransform.height;
@ -1196,6 +1200,7 @@ void nsCSSGradientRenderer::BuildWebRenderDisplayItems(
mozilla::wr::ToLayoutSize(firstTileBounds.Size()),
mozilla::wr::ToLayoutSize(tileSpacing));
} else {
MOZ_ASSERT(mGradient->IsRadial());
gradientRadius.width *= srcTransform.width;
gradientRadius.height *= srcTransform.height;

5
layout/style/ServoStyleConstsInlines.h
View File

@ -439,6 +439,11 @@ inline imgRequestProxy* StyleComputedImageUrl::GetImage() const {
return LoadData().resolved_image;
}
template <>
inline bool StyleGradient::Repeating() const {
return IsLinear() ? AsLinear().repeating : AsRadial().repeating;
}
template <>
bool StyleGradient::IsOpaque() const;

4
layout/style/nsStyleStruct.cpp
View File

@ -1404,7 +1404,9 @@ nsChangeHint nsStyleTableBorder::CalcDifference(
template <>
bool StyleGradient::IsOpaque() const {
for (auto& stop : items.AsSpan()) {
auto items =
IsLinear() ? AsLinear().items.AsSpan() : AsRadial().items.AsSpan();
for (auto& stop : items) {
if (stop.IsInterpolationHint()) {
continue;
}

105
servo/components/style/values/generics/image.rs
View File

@ -51,7 +51,7 @@ pub use self::GenericImage as Image;
/// <https://drafts.csswg.org/css-images/#gradients>
#[derive(Clone, Debug, MallocSizeOf, PartialEq, ToComputedValue, ToResolvedValue, ToShmem)]
#[repr(C)]
pub struct GenericGradient<
pub enum GenericGradient<
LineDirection,
LengthPercentage,
NonNegativeLength,
@ -59,19 +59,30 @@ pub struct GenericGradient<
Position,
Color,
> {
/// Gradients can be linear or radial.
pub kind: GenericGradientKind<
LineDirection,
NonNegativeLength,
NonNegativeLengthPercentage,
Position,
>,
/// The color stops and interpolation hints.
pub items: crate::OwnedSlice<GenericGradientItem<Color, LengthPercentage>>,
/// True if this is a repeating gradient.
pub repeating: bool,
/// Compatibility mode.
pub compat_mode: GradientCompatMode,
/// A linear gradient.
Linear {
/// Line direction
direction: LineDirection,
/// The color stops and interpolation hints.
items: crate::OwnedSlice<GenericGradientItem<Color, LengthPercentage>>,
/// True if this is a repeating gradient.
repeating: bool,
/// Compatibility mode.
compat_mode: GradientCompatMode,
},
/// A radial gradient.
Radial {
/// Shape of gradient
shape: GenericEndingShape<NonNegativeLength, NonNegativeLengthPercentage>,
/// Center of gradient
position: Position,
/// The color stops and interpolation hints.
items: crate::OwnedSlice<GenericGradientItem<Color, LengthPercentage>>,
/// True if this is a repeating gradient.
repeating: bool,
/// Compatibility mode.
compat_mode: GradientCompatMode,
},
}
pub use self::GenericGradient as Gradient;
@ -88,26 +99,6 @@ pub enum GradientCompatMode {
Moz,
}
/// A gradient kind.
#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq, ToComputedValue, ToResolvedValue, ToShmem)]
#[repr(C, u8)]
pub enum GenericGradientKind<
LineDirection,
NonNegativeLength,
NonNegativeLengthPercentage,
Position,
> {
/// A linear gradient.
Linear(LineDirection),
/// A radial gradient.
Radial(
GenericEndingShape<NonNegativeLength, NonNegativeLengthPercentage>,
Position,
),
}
pub use self::GenericGradientKind as GradientKind;
/// A radial gradient's ending shape.
#[derive(
Clone, Copy, Debug, MallocSizeOf, PartialEq, ToComputedValue, ToCss, ToResolvedValue, ToShmem,
@ -330,32 +321,39 @@ where
where
W: Write,
{
match self.compat_mode {
let (compat_mode, repeating) = match *self {
Gradient::Linear { compat_mode, repeating, .. } => (compat_mode, repeating),
Gradient::Radial { compat_mode, repeating, .. } => (compat_mode, repeating),
};
match compat_mode {
GradientCompatMode::WebKit => dest.write_str("-webkit-")?,
GradientCompatMode::Moz => dest.write_str("-moz-")?,
_ => {},
}
if self.repeating {
if repeating {
dest.write_str("repeating-")?;
}
dest.write_str(self.kind.label())?;
dest.write_str("-gradient(")?;
let mut skip_comma = match self.kind {
GradientKind::Linear(ref direction) if direction.points_downwards(self.compat_mode) => {
true
let (items, mut skip_comma) = match *self {
Gradient::Linear { ref direction, compat_mode, ref items, .. } => {
dest.write_str("linear-gradient(")?;
if !direction.points_downwards(compat_mode) {
direction.to_css(dest, compat_mode)?;
(items, false)
} else {
(items, true)
}
},
GradientKind::Linear(ref direction) => {
direction.to_css(dest, self.compat_mode)?;
false
},
GradientKind::Radial(ref shape, ref position) => {
Gradient::Radial { ref shape, ref position, compat_mode, ref items, .. } => {
dest.write_str("radial-gradient(")?;
let omit_shape = match *shape {
EndingShape::Ellipse(Ellipse::Extent(ShapeExtent::Cover)) |
EndingShape::Ellipse(Ellipse::Extent(ShapeExtent::FarthestCorner)) => true,
_ => false,
};
if self.compat_mode == GradientCompatMode::Modern {
if compat_mode == GradientCompatMode::Modern {
if !omit_shape {
shape.to_css(dest)?;
dest.write_str(" ")?;
@ -369,10 +367,10 @@ where
shape.to_css(dest)?;
}
}
false
(items, false)
},
};
for item in &*self.items {
for item in &**items {
if !skip_comma {
dest.write_str(", ")?;
}
@ -383,15 +381,6 @@ where
}
}
impl<D, L, LoP, P> GradientKind<D, L, LoP, P> {
fn label(&self) -> &str {
match *self {
GradientKind::Linear(..) => "linear",
GradientKind::Radial(..) => "radial",
}
}
}
/// The direction of a linear gradient.
pub trait LineDirection {
/// Whether this direction points towards, and thus can be omitted.

116
servo/components/style/values/specified/image.rs
View File

@ -70,10 +70,6 @@ impl SpecifiedValueInfo for Gradient {
}
}
/// A specified gradient kind.
pub type GradientKind =
generic::GradientKind<LineDirection, NonNegativeLength, NonNegativeLengthPercentage, Position>;
/// A specified gradient line direction.
///
/// FIXME(emilio): This should be generic over Angle.
@ -245,25 +241,12 @@ impl Parse for Gradient {
}
};
let (kind, items) = input.parse_nested_block(|i| {
let shape = match shape {
Shape::Linear => GradientKind::parse_linear(context, i, &mut compat_mode)?,
Shape::Radial => GradientKind::parse_radial(context, i, &mut compat_mode)?,
};
let items = generic::GradientItem::parse_comma_separated(context, i)?;
Ok((shape, items))
})?;
if items.len() < 2 {
return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError));
}
Ok(Gradient {
items,
repeating,
kind,
compat_mode,
})
Ok(input.parse_nested_block(|i| {
Ok(match shape {
Shape::Linear => Self::parse_linear(context, i, repeating, &mut compat_mode)?,
Shape::Radial => Self::parse_radial(context, i, repeating, compat_mode)?,
})
})?)
}
}
@ -383,16 +366,21 @@ impl Gradient {
let ident = input.expect_ident_cloned()?;
input.expect_comma()?;
let (kind, reverse_stops) = match_ignore_ascii_case! { &ident,
Ok(match_ignore_ascii_case! { &ident,
"linear" => {
let first = Point::parse(context, input)?;
input.expect_comma()?;
let second = Point::parse(context, input)?;
let direction = LineDirection::from_points(first, second);
let kind = generic::GradientKind::Linear(direction);
let items = Gradient::parse_webkit_gradient_stops(context, input, false)?;
(kind, false)
generic::Gradient::Linear {
direction,
items,
repeating: false,
compat_mode: GradientCompatMode::Modern,
}
},
"radial" => {
let first_point = Point::parse(context, input)?;
@ -412,16 +400,28 @@ impl Gradient {
let rad = Circle::Radius(NonNegative(Length::from_px(radius.value)));
let shape = generic::EndingShape::Circle(rad);
let position: Position = point.into();
let items = Gradient::parse_webkit_gradient_stops(context, input, reverse_stops)?;
let kind = generic::GradientKind::Radial(shape, position);
(kind, reverse_stops)
generic::Gradient::Radial {
shape,
position,
items,
repeating: false,
compat_mode: GradientCompatMode::Modern,
}
},
_ => {
let e = SelectorParseErrorKind::UnexpectedIdent(ident.clone());
return Err(input.new_custom_error(e));
},
};
})
}
fn parse_webkit_gradient_stops<'i, 't>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
reverse_stops: bool,
) -> Result<crate::OwnedSlice<generic::GradientItem<Color, LengthPercentage>>, ParseError<'i>> {
let mut items = input
.try(|i| {
i.expect_comma()?;
@ -500,22 +500,29 @@ impl Gradient {
}
})
}
Ok(generic::Gradient {
kind,
items: items.into(),
repeating: false,
compat_mode: GradientCompatMode::Modern,
})
Ok(items.into())
}
/// Not used for -webkit-gradient syntax.
fn parse_stops<'i, 't>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<crate::OwnedSlice<generic::GradientItem<Color, LengthPercentage>>, ParseError<'i>> {
let items = generic::GradientItem::parse_comma_separated(context, input)?;
if items.len() < 2 {
return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError));
}
Ok(items)
}
}
impl GradientKind {
/// Parses a linear gradient.
/// GradientCompatMode can change during `-moz-` prefixed gradient parsing if it come across a `to` keyword.
fn parse_linear<'i, 't>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
repeating: bool,
compat_mode: &mut GradientCompatMode,
) -> Result<Self, ParseError<'i>> {
let direction = if let Ok(d) = input.try(|i| LineDirection::parse(context, i, compat_mode))
@ -523,23 +530,33 @@ impl GradientKind {
input.expect_comma()?;
d
} else {
match *compat_mode {
match compat_mode {
GradientCompatMode::Modern => {
LineDirection::Vertical(VerticalPositionKeyword::Bottom)
},
_ => LineDirection::Vertical(VerticalPositionKeyword::Top),
}
};
Ok(generic::GradientKind::Linear(direction))
let items = Gradient::parse_stops(context, input)?;
Ok(Gradient::Linear {
direction,
items,
repeating,
compat_mode: *compat_mode,
})
}
/// Parses a radial gradient.
fn parse_radial<'i, 't>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
compat_mode: &mut GradientCompatMode,
repeating: bool,
compat_mode: GradientCompatMode,
) -> Result<Self, ParseError<'i>> {
let (shape, position) = match *compat_mode {
let (shape, position) = match compat_mode {
GradientCompatMode::Modern => {
let shape = input.try(|i| EndingShape::parse(context, i, *compat_mode));
let shape = input.try(|i| EndingShape::parse(context, i, compat_mode));
let position = input.try(|i| {
i.expect_ident_matching("at")?;
Position::parse(context, i)
@ -552,7 +569,7 @@ impl GradientKind {
if position.is_ok() {
i.expect_comma()?;
}
EndingShape::parse(context, i, *compat_mode)
EndingShape::parse(context, i, compat_mode)
});
(shape, position.ok())
},
@ -567,7 +584,16 @@ impl GradientKind {
});
let position = position.unwrap_or(Position::center());
Ok(generic::GradientKind::Radial(shape, position))
let items = Gradient::parse_stops(context, input)?;
Ok(Gradient::Radial {
shape,
position,
items,
repeating,
compat_mode,
})
}
}

2
servo/components/style/values/specified/length.rs
View File

@ -29,7 +29,7 @@ use style_traits::values::specified::AllowedNumericType;
use style_traits::{ParseError, SpecifiedValueInfo, StyleParseErrorKind};
pub use super::image::{EndingShape as GradientEndingShape, Gradient};
pub use super::image::{GradientKind, Image};
pub use super::image::Image;
pub use crate::values::specified::calc::CalcLengthPercentage;
/// Number of app units per pixel

2
servo/components/style/values/specified/mod.rs
View File

@ -56,7 +56,7 @@ pub use self::font::{FontVariantAlternates, FontWeight};
pub use self::font::{FontVariantEastAsian, FontVariationSettings};
pub use self::font::{MozScriptLevel, MozScriptMinSize, MozScriptSizeMultiplier, XLang, XTextZoom};
pub use self::image::{EndingShape as GradientEndingShape, Gradient};
pub use self::image::{GradientKind, Image, MozImageRect};
pub use self::image::{Image, MozImageRect};
pub use self::length::{AbsoluteLength, CalcLengthPercentage, CharacterWidth};
pub use self::length::{FontRelativeLength, Length, LengthOrNumber, NonNegativeLengthOrNumber};
pub use self::length::{LengthOrAuto, LengthPercentage, LengthPercentageOrAuto};

1
servo/ports/geckolib/cbindgen.toml
View File

@ -671,6 +671,7 @@ renaming_overrides_prefixing = true
"""
"GenericGradient" = """
inline bool Repeating() const;
bool IsOpaque() const;
"""