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style: Use less Au in font code.

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Font code is the only thing that was using Au in the style system without
interfacing with Gecko, and there was no real reason for it to do so.

This slightly simplifies the code.

Differential Revision: https://phabricator.services.mozilla.com/D57248
This commit is contained in:
Emilio Cobos Álvarez 2019-12-15 20:15:29 +01:00
parent 4cd8813a81
commit a541046147
13 changed files with 62 additions and 89 deletions
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39
components/style/values/specified/length.rs
View file

@ -47,14 +47,6 @@ pub const AU_PER_PT: CSSFloat = AU_PER_IN / 72.;
/// Number of app units per pica
pub const AU_PER_PC: CSSFloat = AU_PER_PT * 12.;
/// Same as Gecko's AppUnitsToIntCSSPixels
///
/// Converts app units to integer pixel values,
/// rounding during the conversion
pub fn au_to_int_px(au: f32) -> i32 {
(au / AU_PER_PX).round() as i32
}
/// A font relative length.
#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq, ToCss, ToShmem)]
pub enum FontRelativeLength {
@ -87,7 +79,7 @@ pub enum FontBaseSize {
impl FontBaseSize {
/// Calculate the actual size for a given context
pub fn resolve(&self, context: &Context) -> Au {
pub fn resolve(&self, context: &Context) -> computed::Length {
match *self {
FontBaseSize::CurrentStyle => context.style().get_font().clone_font_size().size(),
FontBaseSize::InheritedStyleButStripEmUnits | FontBaseSize::InheritedStyle => {
@ -109,13 +101,9 @@ impl FontRelativeLength {
}
/// Computes the font-relative length.
pub fn to_computed_value(&self, context: &Context, base_size: FontBaseSize) -> CSSPixelLength {
use std::f32;
pub fn to_computed_value(&self, context: &Context, base_size: FontBaseSize) -> computed::Length {
let (reference_size, length) = self.reference_font_size_and_length(context, base_size);
let pixel = (length * reference_size.to_f32_px())
.min(f32::MAX)
.max(f32::MIN);
CSSPixelLength::new(pixel)
reference_size * length
}
/// Return reference font size.
@ -129,7 +117,7 @@ impl FontRelativeLength {
&self,
context: &Context,
base_size: FontBaseSize,
) -> (Au, CSSFloat) {
) -> (computed::Length, CSSFloat) {
fn query_font_metrics(
context: &Context,
base_size: FontBaseSize,
@ -153,7 +141,7 @@ impl FontRelativeLength {
}
if base_size == FontBaseSize::InheritedStyleButStripEmUnits {
(Au(0), length)
(Zero::zero(), length)
} else {
(reference_font_size, length)
}
@ -175,7 +163,7 @@ impl FontRelativeLength {
// determine the x-height, a value of 0.5em must be
// assumed.
//
reference_font_size.scale_by(0.5)
reference_font_size * 0.5
});
(reference_size, length)
},
@ -210,7 +198,7 @@ impl FontRelativeLength {
if wm.is_vertical() && wm.is_upright() {
reference_font_size
} else {
reference_font_size.scale_by(0.5)
reference_font_size * 0.5
}
});
(reference_size, length)
@ -225,7 +213,7 @@ impl FontRelativeLength {
let reference_size = if context.is_root_element || context.in_media_query {
reference_font_size
} else {
context.device().root_font_size()
computed::Length::new(context.device().root_font_size().to_f32_px())
};
(reference_size, length)
},
@ -290,15 +278,14 @@ pub struct CharacterWidth(pub i32);
impl CharacterWidth {
/// Computes the given character width.
pub fn to_computed_value(&self, reference_font_size: Au) -> CSSPixelLength {
// This applies the *converting a character width to pixels* algorithm as specified
// in HTML5 § 14.5.4.
pub fn to_computed_value(&self, reference_font_size: computed::Length) -> computed::Length {
// This applies the *converting a character width to pixels* algorithm
// as specified in HTML5 § 14.5.4.
//
// TODO(pcwalton): Find these from the font.
let average_advance = reference_font_size.scale_by(0.5);
let average_advance = reference_font_size * 0.5;
let max_advance = reference_font_size;
let au = average_advance.scale_by(self.0 as CSSFloat - 1.0) + max_advance;
au.into()
average_advance * (self.0 as CSSFloat - 1.0) + max_advance
}
}