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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::bindings;
use crate::gecko_bindings::structs::CounterStylePtr;
use crate::values::generics::CounterStyle;
use crate::values::Either;
use crate::Atom;
use app_units::Au;
use cssparser::RGBA;
use std::cmp::max;
/// 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 CounterStyle {
/// Convert this counter style to a Gecko CounterStylePtr.
#[inline]
pub fn to_gecko_value(&self, gecko_value: &mut CounterStylePtr) {
unsafe { bindings::Gecko_CounterStyle_ToPtr(self, gecko_value) }
}
/// Convert Gecko CounterStylePtr to CounterStyle or String.
pub fn from_gecko_value(gecko_value: &CounterStylePtr) -> Either<Self, String> {
use crate::values::CustomIdent;
let name = unsafe { bindings::Gecko_CounterStyle_GetName(gecko_value) };
if !name.is_null() {
let name = unsafe { Atom::from_raw(name) };
debug_assert_ne!(name, atom!("none"));
Either::First(CounterStyle::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 = anonymous.mSymbolsType;
let symbols = symbols
.iter()
.map(|gecko_symbol| Symbol::String(gecko_symbol.to_string().into()))
.collect();
Either::First(CounterStyle::Symbols(symbol_type, Symbols(symbols)))
}
}
}
}
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