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values.rs
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values.rs
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/* 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/. */
#![allow(unsafe_code)]
//! Different kind of helpers to interact with Gecko values.
use crate::counter_style::{Symbol, Symbols};
use crate::gecko_bindings::structs::{self, nsStyleCoord, CounterStylePtr};
use crate::gecko_bindings::structs::{StyleGridTrackBreadth, StyleShapeRadius};
use crate::gecko_bindings::sugar::ns_style_coord::{CoordData, CoordDataMut, CoordDataValue};
use crate::media_queries::Device;
use crate::values::computed::basic_shape::ShapeRadius as ComputedShapeRadius;
use crate::values::computed::FlexBasis as ComputedFlexBasis;
use crate::values::computed::{Angle, ExtremumLength, Length, LengthOrPercentage};
use crate::values::computed::{LengthOrPercentageOrAuto, Percentage};
use crate::values::computed::{LengthOrPercentageOrNone, Number, NumberOrPercentage};
use crate::values::computed::{MaxLength as ComputedMaxLength, MozLength as ComputedMozLength};
use crate::values::generics::basic_shape::ShapeRadius;
use crate::values::generics::box_::Perspective;
use crate::values::generics::flex::FlexBasis;
use crate::values::generics::gecko::ScrollSnapPoint;
use crate::values::generics::grid::{TrackBreadth, TrackKeyword};
use crate::values::generics::length::{MaxLength, MozLength};
use crate::values::generics::{CounterStyleOrNone, NonNegative};
use crate::values::{Auto, Either, None_, Normal};
use crate::Atom;
use app_units::Au;
use cssparser::RGBA;
use nsstring::{nsACString, nsCStr};
use std::cmp::max;
/// A trait that defines an interface to convert from and to `nsStyleCoord`s.
///
/// TODO(emilio): Almost everything that is in this file should be somehow
/// switched to cbindgen.
pub trait GeckoStyleCoordConvertible: Sized {
/// Convert this to a `nsStyleCoord`.
fn to_gecko_style_coord<T: CoordDataMut>(&self, coord: &mut T);
/// Given a `nsStyleCoord`, try to get a value of this type..
fn from_gecko_style_coord<T: CoordData>(coord: &T) -> Option<Self>;
}
impl nsStyleCoord {
#[inline]
/// Set this `nsStyleCoord` value to `val`.
pub fn set<T: GeckoStyleCoordConvertible>(&mut self, val: T) {
val.to_gecko_style_coord(self);
}
}
impl<A: GeckoStyleCoordConvertible, B: GeckoStyleCoordConvertible> GeckoStyleCoordConvertible
for Either<A, B>
{
fn to_gecko_style_coord<T: CoordDataMut>(&self, coord: &mut T) {
match *self {
Either::First(ref v) => v.to_gecko_style_coord(coord),
Either::Second(ref v) => v.to_gecko_style_coord(coord),
}
}
fn from_gecko_style_coord<T: CoordData>(coord: &T) -> Option<Self> {
A::from_gecko_style_coord(coord)
.map(Either::First)
.or_else(|| B::from_gecko_style_coord(coord).map(Either::Second))
}
}
impl<Inner> GeckoStyleCoordConvertible for NonNegative<Inner>
where
Inner: GeckoStyleCoordConvertible,
{
fn to_gecko_style_coord<T: CoordDataMut>(&self, coord: &mut T) {
self.0.to_gecko_style_coord(coord)
}
fn from_gecko_style_coord<T: CoordData>(coord: &T) -> Option<Self> {
Some(NonNegative(Inner::from_gecko_style_coord(coord)?))
}
}
impl GeckoStyleCoordConvertible for ComputedFlexBasis {
fn to_gecko_style_coord<T: CoordDataMut>(&self, coord: &mut T) {
match *self {
FlexBasis::Content => coord.set_value(CoordDataValue::Enumerated(
structs::NS_STYLE_FLEX_BASIS_CONTENT,
)),
FlexBasis::Width(ref w) => w.to_gecko_style_coord(coord),
}
}
fn from_gecko_style_coord<T: CoordData>(coord: &T) -> Option<Self> {
if let Some(width) = ComputedMozLength::from_gecko_style_coord(coord) {
return Some(FlexBasis::Width(width));
}
if let CoordDataValue::Enumerated(structs::NS_STYLE_FLEX_BASIS_CONTENT) = coord.as_value() {
return Some(FlexBasis::Content);
}
None
}
}
impl GeckoStyleCoordConvertible for Number {
fn to_gecko_style_coord<T: CoordDataMut>(&self, coord: &mut T) {
coord.set_value(CoordDataValue::Factor(*self));
}
fn from_gecko_style_coord<T: CoordData>(coord: &T) -> Option<Self> {
match coord.as_value() {
CoordDataValue::Factor(f) => Some(f),
_ => None,
}
}
}
impl GeckoStyleCoordConvertible for Percentage {
fn to_gecko_style_coord<T: CoordDataMut>(&self, coord: &mut T) {
coord.set_value(CoordDataValue::Percent(self.0));
}
fn from_gecko_style_coord<T: CoordData>(coord: &T) -> Option<Self> {
match coord.as_value() {
CoordDataValue::Percent(p) => Some(Percentage(p)),
_ => None,
}
}
}
impl GeckoStyleCoordConvertible for NumberOrPercentage {
fn to_gecko_style_coord<T: CoordDataMut>(&self, coord: &mut T) {
match *self {
NumberOrPercentage::Number(ref n) => n.to_gecko_style_coord(coord),
NumberOrPercentage::Percentage(ref p) => p.to_gecko_style_coord(coord),
}
}
fn from_gecko_style_coord<T: CoordData>(coord: &T) -> Option<Self> {
match coord.as_value() {
CoordDataValue::Factor(f) => Some(NumberOrPercentage::Number(f)),
CoordDataValue::Percent(p) => Some(NumberOrPercentage::Percentage(Percentage(p))),
_ => None,
}
}
}
impl GeckoStyleCoordConvertible for LengthOrPercentage {
fn to_gecko_style_coord<T: CoordDataMut>(&self, coord: &mut T) {
let value = match *self {
LengthOrPercentage::Length(px) => CoordDataValue::Coord(px.to_i32_au()),
LengthOrPercentage::Percentage(p) => CoordDataValue::Percent(p.0),
LengthOrPercentage::Calc(calc) => CoordDataValue::Calc(calc.into()),
};
coord.set_value(value);
}
fn from_gecko_style_coord<T: CoordData>(coord: &T) -> Option<Self> {
match coord.as_value() {
CoordDataValue::Coord(coord) => Some(LengthOrPercentage::Length(Au(coord).into())),
CoordDataValue::Percent(p) => Some(LengthOrPercentage::Percentage(Percentage(p))),
CoordDataValue::Calc(calc) => Some(LengthOrPercentage::Calc(calc.into())),
_ => None,
}
}
}
impl GeckoStyleCoordConvertible for Length {
fn to_gecko_style_coord<T: CoordDataMut>(&self, coord: &mut T) {
coord.set_value(CoordDataValue::Coord(self.to_i32_au()));
}
fn from_gecko_style_coord<T: CoordData>(coord: &T) -> Option<Self> {
match coord.as_value() {
CoordDataValue::Coord(coord) => Some(Au(coord).into()),
_ => None,
}
}
}
impl GeckoStyleCoordConvertible for LengthOrPercentageOrAuto {
fn to_gecko_style_coord<T: CoordDataMut>(&self, coord: &mut T) {
let value = match *self {
LengthOrPercentageOrAuto::Length(px) => CoordDataValue::Coord(px.to_i32_au()),
LengthOrPercentageOrAuto::Percentage(p) => CoordDataValue::Percent(p.0),
LengthOrPercentageOrAuto::Auto => CoordDataValue::Auto,
LengthOrPercentageOrAuto::Calc(calc) => CoordDataValue::Calc(calc.into()),
};
coord.set_value(value);
}
fn from_gecko_style_coord<T: CoordData>(coord: &T) -> Option<Self> {
match coord.as_value() {
CoordDataValue::Coord(coord) => {
Some(LengthOrPercentageOrAuto::Length(Au(coord).into()))
},
CoordDataValue::Percent(p) => Some(LengthOrPercentageOrAuto::Percentage(Percentage(p))),
CoordDataValue::Auto => Some(LengthOrPercentageOrAuto::Auto),
CoordDataValue::Calc(calc) => Some(LengthOrPercentageOrAuto::Calc(calc.into())),
_ => None,
}
}
}
impl GeckoStyleCoordConvertible for LengthOrPercentageOrNone {
fn to_gecko_style_coord<T: CoordDataMut>(&self, coord: &mut T) {
let value = match *self {
LengthOrPercentageOrNone::Length(px) => CoordDataValue::Coord(px.to_i32_au()),
LengthOrPercentageOrNone::Percentage(p) => CoordDataValue::Percent(p.0),
LengthOrPercentageOrNone::None => CoordDataValue::None,
LengthOrPercentageOrNone::Calc(calc) => CoordDataValue::Calc(calc.into()),
};
coord.set_value(value);
}
fn from_gecko_style_coord<T: CoordData>(coord: &T) -> Option<Self> {
match coord.as_value() {
CoordDataValue::Coord(coord) => {
Some(LengthOrPercentageOrNone::Length(Au(coord).into()))
},
CoordDataValue::Percent(p) => Some(LengthOrPercentageOrNone::Percentage(Percentage(p))),
CoordDataValue::None => Some(LengthOrPercentageOrNone::None),
CoordDataValue::Calc(calc) => Some(LengthOrPercentageOrNone::Calc(calc.into())),
_ => None,
}
}
}
impl<L: GeckoStyleCoordConvertible> GeckoStyleCoordConvertible for TrackBreadth<L> {
fn to_gecko_style_coord<T: CoordDataMut>(&self, coord: &mut T) {
match *self {
TrackBreadth::Breadth(ref lop) => lop.to_gecko_style_coord(coord),
TrackBreadth::Fr(fr) => coord.set_value(CoordDataValue::FlexFraction(fr)),
TrackBreadth::Keyword(TrackKeyword::Auto) => coord.set_value(CoordDataValue::Auto),
TrackBreadth::Keyword(TrackKeyword::MinContent) => coord.set_value(
CoordDataValue::Enumerated(StyleGridTrackBreadth::MinContent as u32),
),
TrackBreadth::Keyword(TrackKeyword::MaxContent) => coord.set_value(
CoordDataValue::Enumerated(StyleGridTrackBreadth::MaxContent as u32),
),
}
}
fn from_gecko_style_coord<T: CoordData>(coord: &T) -> Option<Self> {
L::from_gecko_style_coord(coord)
.map(TrackBreadth::Breadth)
.or_else(|| match coord.as_value() {
CoordDataValue::Enumerated(v) => {
if v == StyleGridTrackBreadth::MinContent as u32 {
Some(TrackBreadth::Keyword(TrackKeyword::MinContent))
} else if v == StyleGridTrackBreadth::MaxContent as u32 {
Some(TrackBreadth::Keyword(TrackKeyword::MaxContent))
} else {
None
}
},
CoordDataValue::FlexFraction(fr) => Some(TrackBreadth::Fr(fr)),
CoordDataValue::Auto => Some(TrackBreadth::Keyword(TrackKeyword::Auto)),
_ => L::from_gecko_style_coord(coord).map(TrackBreadth::Breadth),
})
}
}
impl GeckoStyleCoordConvertible for ComputedShapeRadius {
fn to_gecko_style_coord<T: CoordDataMut>(&self, coord: &mut T) {
match *self {
ShapeRadius::ClosestSide => coord.set_value(CoordDataValue::Enumerated(
StyleShapeRadius::ClosestSide as u32,
)),
ShapeRadius::FarthestSide => coord.set_value(CoordDataValue::Enumerated(
StyleShapeRadius::FarthestSide as u32,
)),
ShapeRadius::Length(lop) => lop.to_gecko_style_coord(coord),
}
}
fn from_gecko_style_coord<T: CoordData>(coord: &T) -> Option<Self> {
match coord.as_value() {
CoordDataValue::Enumerated(v) => {
if v == StyleShapeRadius::ClosestSide as u32 {
Some(ShapeRadius::ClosestSide)
} else if v == StyleShapeRadius::FarthestSide as u32 {
Some(ShapeRadius::FarthestSide)
} else {
None
}
},
_ => GeckoStyleCoordConvertible::from_gecko_style_coord(coord).map(ShapeRadius::Length),
}
}
}
impl<T: GeckoStyleCoordConvertible> GeckoStyleCoordConvertible for Option<T> {
fn to_gecko_style_coord<U: CoordDataMut>(&self, coord: &mut U) {
if let Some(ref me) = *self {
me.to_gecko_style_coord(coord);
} else {
coord.set_value(CoordDataValue::None);
}
}
fn from_gecko_style_coord<U: CoordData>(coord: &U) -> Option<Self> {
Some(T::from_gecko_style_coord(coord))
}
}
impl GeckoStyleCoordConvertible for Angle {
fn to_gecko_style_coord<T: CoordDataMut>(&self, coord: &mut T) {
coord.set_value(CoordDataValue::from(*self));
}
fn from_gecko_style_coord<T: CoordData>(coord: &T) -> Option<Self> {
match coord.as_value() {
CoordDataValue::Degree(val) => Some(Angle::from_degrees(val)),
_ => None,
}
}
}
impl GeckoStyleCoordConvertible for Auto {
fn to_gecko_style_coord<T: CoordDataMut>(&self, coord: &mut T) {
coord.set_value(CoordDataValue::Auto)
}
fn from_gecko_style_coord<T: CoordData>(coord: &T) -> Option<Self> {
if let CoordDataValue::Auto = coord.as_value() {
Some(Auto)
} else {
None
}
}
}
impl GeckoStyleCoordConvertible for None_ {
fn to_gecko_style_coord<T: CoordDataMut>(&self, coord: &mut T) {
coord.set_value(CoordDataValue::None)
}
fn from_gecko_style_coord<T: CoordData>(coord: &T) -> Option<Self> {
if let CoordDataValue::None = coord.as_value() {
Some(None_)
} else {
None
}
}
}
impl GeckoStyleCoordConvertible for Normal {
fn to_gecko_style_coord<T: CoordDataMut>(&self, coord: &mut T) {
coord.set_value(CoordDataValue::Normal)
}
fn from_gecko_style_coord<T: CoordData>(coord: &T) -> Option<Self> {
if let CoordDataValue::Normal = coord.as_value() {
Some(Normal)
} else {
None
}
}
}
impl GeckoStyleCoordConvertible for ExtremumLength {
fn to_gecko_style_coord<T: CoordDataMut>(&self, coord: &mut T) {
coord.set_value(CoordDataValue::Enumerated(*self as u32));
}
fn from_gecko_style_coord<T: CoordData>(coord: &T) -> Option<Self> {
use num_traits::FromPrimitive;
match coord.as_value() {
CoordDataValue::Enumerated(v) => ExtremumLength::from_u32(v),
_ => None,
}
}
}
impl GeckoStyleCoordConvertible for ComputedMozLength {
fn to_gecko_style_coord<T: CoordDataMut>(&self, coord: &mut T) {
match *self {
MozLength::LengthOrPercentageOrAuto(ref lopoa) => lopoa.to_gecko_style_coord(coord),
MozLength::ExtremumLength(ref e) => e.to_gecko_style_coord(coord),
}
}
fn from_gecko_style_coord<T: CoordData>(coord: &T) -> Option<Self> {
LengthOrPercentageOrAuto::from_gecko_style_coord(coord)
.map(MozLength::LengthOrPercentageOrAuto)
.or_else(|| {
ExtremumLength::from_gecko_style_coord(coord).map(MozLength::ExtremumLength)
})
}
}
impl GeckoStyleCoordConvertible for ComputedMaxLength {
fn to_gecko_style_coord<T: CoordDataMut>(&self, coord: &mut T) {
match *self {
MaxLength::LengthOrPercentageOrNone(ref lopon) => lopon.to_gecko_style_coord(coord),
MaxLength::ExtremumLength(ref e) => e.to_gecko_style_coord(coord),
}
}
fn from_gecko_style_coord<T: CoordData>(coord: &T) -> Option<Self> {
LengthOrPercentageOrNone::from_gecko_style_coord(coord)
.map(MaxLength::LengthOrPercentageOrNone)
.or_else(|| {
ExtremumLength::from_gecko_style_coord(coord).map(MaxLength::ExtremumLength)
})
}
}
impl GeckoStyleCoordConvertible for ScrollSnapPoint<LengthOrPercentage> {
fn to_gecko_style_coord<T: CoordDataMut>(&self, coord: &mut T) {
match self.repeated() {
None => coord.set_value(CoordDataValue::None),
Some(l) => l.to_gecko_style_coord(coord),
};
}
fn from_gecko_style_coord<T: CoordData>(coord: &T) -> Option<Self> {
use crate::gecko_bindings::structs::root::nsStyleUnit;
use crate::values::generics::gecko::ScrollSnapPoint;
Some(match coord.unit() {
nsStyleUnit::eStyleUnit_None => ScrollSnapPoint::None,
_ => ScrollSnapPoint::Repeat(
LengthOrPercentage::from_gecko_style_coord(coord)
.expect("coord could not convert to LengthOrPercentage"),
),
})
}
}
impl<L> GeckoStyleCoordConvertible for Perspective<L>
where
L: GeckoStyleCoordConvertible,
{
fn to_gecko_style_coord<T: CoordDataMut>(&self, coord: &mut T) {
match *self {
Perspective::None => coord.set_value(CoordDataValue::None),
Perspective::Length(ref l) => l.to_gecko_style_coord(coord),
};
}
fn from_gecko_style_coord<T: CoordData>(coord: &T) -> Option<Self> {
use crate::gecko_bindings::structs::root::nsStyleUnit;
if coord.unit() == nsStyleUnit::eStyleUnit_None {
return Some(Perspective::None);
}
Some(Perspective::Length(L::from_gecko_style_coord(coord)?))
}
}
/// Convert a given RGBA value to `nscolor`.
pub fn convert_rgba_to_nscolor(rgba: &RGBA) -> u32 {
((rgba.alpha as u32) << 24) |
((rgba.blue as u32) << 16) |
((rgba.green as u32) << 8) |
(rgba.red as u32)
}
/// Convert a given `nscolor` to a Servo RGBA value.
pub fn convert_nscolor_to_rgba(color: u32) -> RGBA {
RGBA::new(
(color & 0xff) as u8,
(color >> 8 & 0xff) as u8,
(color >> 16 & 0xff) as u8,
(color >> 24 & 0xff) as u8,
)
}
/// Round `width` down to the nearest device pixel, but any non-zero value that
/// would round down to zero is clamped to 1 device pixel. Used for storing
/// computed values of border-*-width and outline-width.
#[inline]
pub fn round_border_to_device_pixels(width: Au, au_per_device_px: Au) -> Au {
if width == Au(0) {
Au(0)
} else {
max(
au_per_device_px,
Au(width.0 / au_per_device_px.0 * au_per_device_px.0),
)
}
}
impl CounterStyleOrNone {
/// Convert this counter style to a Gecko CounterStylePtr.
pub fn to_gecko_value(self, gecko_value: &mut CounterStylePtr, device: &Device) {
use crate::gecko_bindings::bindings::Gecko_SetCounterStyleToName as set_name;
use crate::gecko_bindings::bindings::Gecko_SetCounterStyleToSymbols as set_symbols;
let pres_context = device.pres_context();
match self {
CounterStyleOrNone::None => unsafe {
set_name(gecko_value, atom!("none").into_addrefed(), pres_context);
},
CounterStyleOrNone::Name(name) => unsafe {
set_name(gecko_value, name.0.into_addrefed(), pres_context);
},
CounterStyleOrNone::Symbols(symbols_type, symbols) => {
let symbols: Vec<_> = symbols
.0
.iter()
.map(|symbol| match *symbol {
Symbol::String(ref s) => nsCStr::from(s),
Symbol::Ident(_) => unreachable!("Should not have identifier in symbols()"),
})
.collect();
let symbols: Vec<_> = symbols
.iter()
.map(|symbol| symbol as &nsACString as *const _)
.collect();
unsafe {
set_symbols(
gecko_value,
symbols_type.to_gecko_keyword(),
symbols.as_ptr(),
symbols.len() as u32,
)
};
},
}
}
/// Convert Gecko CounterStylePtr to CounterStyleOrNone or String.
pub fn from_gecko_value(gecko_value: &CounterStylePtr) -> Either<Self, String> {
use crate::gecko_bindings::bindings;
use crate::values::generics::SymbolsType;
use crate::values::CustomIdent;
let name = unsafe { bindings::Gecko_CounterStyle_GetName(gecko_value) };
if !name.is_null() {
let name = unsafe { Atom::from_raw(name) };
if name == atom!("none") {
Either::First(CounterStyleOrNone::None)
} else {
Either::First(CounterStyleOrNone::Name(CustomIdent(name)))
}
} else {
let anonymous =
unsafe { bindings::Gecko_CounterStyle_GetAnonymous(gecko_value).as_ref() }.unwrap();
let symbols = &anonymous.mSymbols;
if anonymous.mSingleString {
debug_assert_eq!(symbols.len(), 1);
Either::Second(symbols[0].to_string())
} else {
let symbol_type = SymbolsType::from_gecko_keyword(anonymous.mSystem as u32);
let symbols = symbols
.iter()
.map(|gecko_symbol| Symbol::String(gecko_symbol.to_string()))
.collect();
Either::First(CounterStyleOrNone::Symbols(symbol_type, Symbols(symbols)))
}
}
}
}