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style: Support x as a resolution unit.

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Bug: 1460655
Reviewed-by: xidorn
MozReview-Commit-ID: TjU0FLCLMN
This commit is contained in:
Emilio Cobos Álvarez 2018-05-10 18:11:52 +02:00
parent 2f18b67ce1
commit ce62cb1ba7
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GPG key ID: 056B727BB9C1027C
1 changed files with 6 additions and 0 deletions
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6
components/style/values/specified/resolution.rs
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@ -17,6 +17,9 @@ 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),
@ -29,6 +32,7 @@ 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,
}
@ -38,6 +42,7 @@ impl Resolution {
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,
}
@ -65,6 +70,7 @@ impl Parse for Resolution {
"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())
)),