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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/. */
//! Resolution values:
//!
//! https://drafts.csswg.org/css-values/#resolution
use crate::parser::{Parse, ParserContext};
use crate::values::CSSFloat;
use cssparser::{Parser, Token};
use style_traits::{ParseError, StyleParseErrorKind};
/// A specified resolution.
#[derive(Clone, Debug, MallocSizeOf, PartialEq, SpecifiedValueInfo, ToCss, ToShmem)]
pub enum Resolution {
/// Dots per inch.
#[css(dimension)]
Dpi(CSSFloat),
/// An alias unit for dots per pixel.
#[css(dimension)]
X(CSSFloat),
/// Dots per pixel.
#[css(dimension)]
Dppx(CSSFloat),
/// Dots per centimeter.
#[css(dimension)]
Dpcm(CSSFloat),
}
impl Resolution {
/// Convert this resolution value to dppx units.
pub fn to_dppx(&self) -> CSSFloat {
match *self {
Resolution::X(f) | Resolution::Dppx(f) => f,
_ => self.to_dpi() / 96.0,
}
}
/// Convert this resolution value to dpi units.
pub fn to_dpi(&self) -> CSSFloat {
match *self {
Resolution::Dpi(f) => f,
Resolution::X(f) | Resolution::Dppx(f) => f * 96.0,
Resolution::Dpcm(f) => f * 2.54,
}
}
}
impl Parse for Resolution {
fn parse<'i, 't>(
_: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<Self, ParseError<'i>> {
let location = input.current_source_location();
let (value, unit) = match *input.next()? {
Token::Dimension {
value, ref unit, ..
} => (value, unit),
ref t => return Err(location.new_unexpected_token_error(t.clone())),
};
if value <= 0. {
return Err(location.new_custom_error(StyleParseErrorKind::UnspecifiedError));
}
match_ignore_ascii_case! { &unit,
"dpi" => Ok(Resolution::Dpi(value)),
"dppx" => Ok(Resolution::Dppx(value)),
"dpcm" => Ok(Resolution::Dpcm(value)),
"x" => Ok(Resolution::X(value)),
_ => Err(location.new_custom_error(
StyleParseErrorKind::UnexpectedDimension(unit.clone())
)),
}
}
}
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