mirror of
https://github.com/servo/servo.git
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Refactor style::values::specified::Length to store length by kind (absolute, font-relative or character width)
This commit is contained in:
James Gilbertson
parent
00785ecf63
commit
41786c4cb4
3 changed files with 105 additions and 75 deletions
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@ -119,7 +119,7 @@ impl PresentationalHintSynthesis for Stylist {
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*shareable = false
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}
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LengthOrPercentageOrAuto::Length(length) => {
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let width_value = specified::LengthOrPercentageOrAuto::Length(specified::Length::Au(length));
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let width_value = specified::LengthOrPercentageOrAuto::Length(specified::Length::Absolute(length));
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matching_rules_list.vec_push(from_declaration(
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PropertyDeclaration::Width(SpecifiedValue(width_value))));
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*shareable = false
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@ -160,9 +160,9 @@ impl PresentationalHintSynthesis for Stylist {
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// FIXME(pcwalton): More use of atoms, please!
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let value = match element.get_attr(&ns!(""), &atom!("type")) {
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Some("text") | Some("password") => {
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specified::Length::ServoCharacterWidth(value)
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specified::Length::ServoCharacterWidth(specified::CharacterWidth(value))
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}
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_ => specified::Length::Au(Au::from_px(value as int)),
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_ => specified::Length::Absolute(Au::from_px(value as int)),
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};
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matching_rules_list.vec_push(from_declaration(
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PropertyDeclaration::Width(SpecifiedValue(
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@ -180,7 +180,7 @@ impl PresentationalHintSynthesis for Stylist {
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// scrollbar size into consideration (but we don't have a scrollbar yet!)
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//
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// https://html.spec.whatwg.org/multipage/rendering.html#textarea-effective-width
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let value = specified::Length::ServoCharacterWidth(value);
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let value = specified::Length::ServoCharacterWidth(specified::CharacterWidth(value));
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matching_rules_list.vec_push(from_declaration(
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PropertyDeclaration::Width(SpecifiedValue(
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specified::LengthOrPercentageOrAuto::Length(value)))));
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@ -193,7 +193,7 @@ impl PresentationalHintSynthesis for Stylist {
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// TODO(mttr) This should take scrollbar size into consideration.
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//
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// https://html.spec.whatwg.org/multipage/rendering.html#textarea-effective-height
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let value = specified::Length::Em(value as CSSFloat);
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let value = specified::Length::FontRelative(specified::FontRelativeLength::Em(value as CSSFloat));
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matching_rules_list.vec_push(from_declaration(
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PropertyDeclaration::Height(SpecifiedValue(
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longhands::height::SpecifiedValue(
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@ -241,7 +241,7 @@ impl PresentationalHintSynthesis for Stylist {
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match element.get_unsigned_integer_attribute(UnsignedIntegerAttribute::Border) {
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None => {}
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Some(length) => {
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let width_value = specified::Length::Au(Au::from_px(length as int));
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let width_value = specified::Length::Absolute(Au::from_px(length as int));
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matching_rules_list.vec_push(from_declaration(
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PropertyDeclaration::BorderTopWidth(SpecifiedValue(
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longhands::border_top_width::SpecifiedValue(width_value)))));
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@ -566,7 +566,7 @@ pub mod longhands {
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SpecifiedValue::Number(value) => computed_value::T::Number(value),
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SpecifiedValue::Percentage(value) => {
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computed_value::T::Length(
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specified::Length::Em(value).to_computed_value(context))
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specified::Length::FontRelative(specified::FontRelativeLength::Em(value)).to_computed_value(context))
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}
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}
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}
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@ -1475,21 +1475,21 @@ pub mod longhands {
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input.try(specified::LengthOrPercentage::parse_non_negative)
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.map(|value| match value {
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specified::LengthOrPercentage::Length(value) => value,
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specified::LengthOrPercentage::Percentage(value) => specified::Length::Em(value)
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specified::LengthOrPercentage::Percentage(value) => specified::Length::FontRelative(specified::FontRelativeLength::Em(value))
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})
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.or_else(|()| {
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match_ignore_ascii_case! { try!(input.expect_ident()),
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"xx-small" => Ok(specified::Length::Au(Au::from_px(MEDIUM_PX) * 3 / 5)),
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"x-small" => Ok(specified::Length::Au(Au::from_px(MEDIUM_PX) * 3 / 4)),
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"small" => Ok(specified::Length::Au(Au::from_px(MEDIUM_PX) * 8 / 9)),
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"medium" => Ok(specified::Length::Au(Au::from_px(MEDIUM_PX))),
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"large" => Ok(specified::Length::Au(Au::from_px(MEDIUM_PX) * 6 / 5)),
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"x-large" => Ok(specified::Length::Au(Au::from_px(MEDIUM_PX) * 3 / 2)),
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"xx-large" => Ok(specified::Length::Au(Au::from_px(MEDIUM_PX) * 2)),
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"xx-small" => Ok(specified::Length::Absolute(Au::from_px(MEDIUM_PX) * 3 / 5)),
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"x-small" => Ok(specified::Length::Absolute(Au::from_px(MEDIUM_PX) * 3 / 4)),
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"small" => Ok(specified::Length::Absolute(Au::from_px(MEDIUM_PX) * 8 / 9)),
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"medium" => Ok(specified::Length::Absolute(Au::from_px(MEDIUM_PX))),
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"large" => Ok(specified::Length::Absolute(Au::from_px(MEDIUM_PX) * 6 / 5)),
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"x-large" => Ok(specified::Length::Absolute(Au::from_px(MEDIUM_PX) * 3 / 2)),
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"xx-large" => Ok(specified::Length::Absolute(Au::from_px(MEDIUM_PX) * 2)),
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// https://github.com/servo/servo/issues/3423#issuecomment-56321664
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"smaller" => Ok(specified::Length::Em(0.85)),
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"larger" => Ok(specified::Length::Em(1.2))
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"smaller" => Ok(specified::Length::FontRelative(specified::FontRelativeLength::Em(0.85))),
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"larger" => Ok(specified::Length::FontRelative(specified::FontRelativeLength::Em(1.2)))
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_ => Err(())
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}
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@ -2038,7 +2038,7 @@ pub mod longhands {
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pub fn parse_one_box_shadow(input: &mut Parser) -> Result<SpecifiedBoxShadow, ()> {
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use util::geometry::Au;
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let mut lengths = [specified::Length::Au(Au(0)); 4];
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let mut lengths = [specified::Length::Absolute(Au(0)); 4];
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let mut lengths_parsed = false;
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let mut color = None;
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let mut inset = false;
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@ -2208,10 +2208,10 @@ pub mod longhands {
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}));
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if sides.len() == 4 {
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Ok(Some(SpecifiedClipRect {
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top: sides[0].unwrap_or(Length::Au(Au(0))),
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top: sides[0].unwrap_or(Length::Absolute(Au(0))),
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right: sides[1],
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bottom: sides[2],
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left: sides[3].unwrap_or(Length::Au(Au(0))),
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left: sides[3].unwrap_or(Length::Absolute(Au(0))),
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}))
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} else {
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Err(())
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@ -2317,7 +2317,7 @@ pub mod longhands {
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fn parse_one_text_shadow(input: &mut Parser) -> Result<SpecifiedTextShadow,()> {
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use util::geometry::Au;
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let mut lengths = [specified::Length::Au(Au(0)); 3];
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let mut lengths = [specified::Length::Absolute(Au(0)); 3];
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let mut lengths_parsed = false;
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let mut color = None;
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@ -2857,7 +2857,7 @@ pub mod shorthands {
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fn parse_one_set_of_border_radii(mut input: &mut Parser)
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-> Result<[LengthOrPercentage; 4], ()> {
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let mut count = 0;
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let mut values = [LengthOrPercentage::Length(Length::Au(Au(0))); 4];
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let mut values = [LengthOrPercentage::Length(Length::Absolute(Au(0))); 4];
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while count < 4 {
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if let Ok(value) = input.try(LengthOrPercentage::parse) {
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values[count] = value;
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@ -3773,11 +3773,7 @@ pub fn cascade(viewport_size: Size2D<Au>,
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match *declaration {
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PropertyDeclaration::FontSize(ref value) => {
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context.font_size = match *value {
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DeclaredValue::SpecifiedValue(ref specified_value) => {
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specified_value.0.to_computed_value_with_font_size(
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context.inherited_font_size, context.root_font_size
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)
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}
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DeclaredValue::SpecifiedValue(ref specified_value) => specified_value.0.to_computed_value(&context),
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DeclaredValue::Initial => longhands::font_size::get_initial_value(),
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DeclaredValue::Inherit => context.inherited_font_size,
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}
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@ -114,17 +114,70 @@ pub mod specified {
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}
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#[derive(Clone, PartialEq, Copy)]
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pub enum Length {
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Au(Au), // application units
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pub enum FontRelativeLength {
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Em(CSSFloat),
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Ex(CSSFloat),
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Rem(CSSFloat),
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Ch(CSSFloat),
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Rem(CSSFloat)
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}
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impl fmt::Debug for FontRelativeLength {
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#[inline] fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { self.fmt_to_css(f) }
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}
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impl ToCss for FontRelativeLength {
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fn to_css<W>(&self, dest: &mut W) -> text_writer::Result where W: TextWriter {
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match self {
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&FontRelativeLength::Em(length) => write!(dest, "{}em", length),
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&FontRelativeLength::Ex(length) => write!(dest, "{}ex", length),
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&FontRelativeLength::Ch(length) => write!(dest, "{}ch", length),
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&FontRelativeLength::Rem(length) => write!(dest, "{}rem", length)
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}
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}
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}
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impl FontRelativeLength {
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pub fn to_computed_value(&self,
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reference_font_size: Au,
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root_font_size: Au)
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-> Au
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{
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match self {
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&FontRelativeLength::Em(length) => reference_font_size.scale_by(length),
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&FontRelativeLength::Ex(length) => {
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let x_height = 0.5; // TODO: find that from the font
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reference_font_size.scale_by(length * x_height)
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},
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&FontRelativeLength::Ch(_) => unimplemented!(),
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&FontRelativeLength::Rem(length) => root_font_size.scale_by(length)
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}
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}
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}
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#[derive(Clone, PartialEq, Copy)]
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pub struct CharacterWidth(pub i32);
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impl CharacterWidth {
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pub fn to_computed_value(&self, reference_font_size: Au) -> Au {
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// This applies the *converting a character width to pixels* algorithm as specified
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// in HTML5 § 14.5.4.
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//
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// TODO(pcwalton): Find these from the font.
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let average_advance = reference_font_size.scale_by(0.5);
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let max_advance = reference_font_size;
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average_advance.scale_by(self.0 as CSSFloat - 1.0) + max_advance
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}
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}
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#[derive(Clone, PartialEq, Copy)]
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pub enum Length {
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Absolute(Au), // application units
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FontRelative(FontRelativeLength),
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/// HTML5 "character width", as defined in HTML5 § 14.5.4.
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///
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/// This cannot be specified by the user directly and is only generated by
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/// `Stylist::synthesize_rules_for_legacy_attributes()`.
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ServoCharacterWidth(i32),
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ServoCharacterWidth(CharacterWidth),
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}
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impl fmt::Debug for Length {
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@ -134,41 +187,14 @@ pub mod specified {
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impl ToCss for Length {
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fn to_css<W>(&self, dest: &mut W) -> text_writer::Result where W: TextWriter {
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match self {
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&Length::Au(length) => write!(dest, "{}px", length.to_subpx()),
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&Length::Em(length) => write!(dest, "{}em", length),
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&Length::Ex(length) => write!(dest, "{}ex", length),
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&Length::Rem(length) => write!(dest, "{}rem", length),
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&Length::Absolute(length) => write!(dest, "{}px", length.to_subpx()),
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&Length::FontRelative(length) => length.to_css(dest),
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&Length::ServoCharacterWidth(_)
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=> panic!("internal CSS values should never be serialized"),
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}
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}
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}
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impl Length {
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pub fn to_computed_value_with_font_size(&self, reference_font_size: Au, root_font_size: Au)
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-> Au {
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match *self {
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Length::Au(value) => value,
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Length::Em(value) => reference_font_size.scale_by(value),
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Length::Ex(value) => {
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let x_height = 0.5; // TODO: find that from the font
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reference_font_size.scale_by(value * x_height)
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},
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Length::Rem(value) => root_font_size.scale_by(value),
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Length::ServoCharacterWidth(value) => {
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// This applies the *converting a character width to pixels* algorithm as specified
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// in HTML5 § 14.5.4.
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//
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// TODO(pcwalton): Find these from the font.
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let average_advance = reference_font_size.scale_by(0.5);
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let max_advance = reference_font_size;
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average_advance.scale_by(value as CSSFloat - 1.0) + max_advance
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}
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}
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}
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}
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const AU_PER_PX: CSSFloat = 60.;
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const AU_PER_IN: CSSFloat = AU_PER_PX * 96.;
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const AU_PER_CM: CSSFloat = AU_PER_IN / 2.54;
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@ -182,7 +208,7 @@ pub mod specified {
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Token::Dimension(ref value, ref unit) if negative_ok || value.value >= 0. => {
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Length::parse_dimension(value.value, unit)
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}
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Token::Number(ref value) if value.value == 0. => Ok(Length::Au(Au(0))),
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Token::Number(ref value) if value.value == 0. => Ok(Length::Absolute(Au(0))),
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_ => Err(())
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}
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}
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@ -196,20 +222,22 @@ pub mod specified {
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pub fn parse_dimension(value: CSSFloat, unit: &str) -> Result<Length, ()> {
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match_ignore_ascii_case! { unit,
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"px" => Ok(Length::from_px(value)),
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"in" => Ok(Length::Au(Au((value * AU_PER_IN) as i32))),
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"cm" => Ok(Length::Au(Au((value * AU_PER_CM) as i32))),
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"mm" => Ok(Length::Au(Au((value * AU_PER_MM) as i32))),
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"pt" => Ok(Length::Au(Au((value * AU_PER_PT) as i32))),
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"pc" => Ok(Length::Au(Au((value * AU_PER_PC) as i32))),
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"em" => Ok(Length::Em(value)),
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"ex" => Ok(Length::Ex(value)),
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"rem" => Ok(Length::Rem(value))
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"in" => Ok(Length::Absolute(Au((value * AU_PER_IN) as i32))),
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"cm" => Ok(Length::Absolute(Au((value * AU_PER_CM) as i32))),
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"mm" => Ok(Length::Absolute(Au((value * AU_PER_MM) as i32))),
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"pt" => Ok(Length::Absolute(Au((value * AU_PER_PT) as i32))),
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"pc" => Ok(Length::Absolute(Au((value * AU_PER_PC) as i32))),
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// font-relative
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"em" => Ok(Length::FontRelative(FontRelativeLength::Em(value))),
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"ex" => Ok(Length::FontRelative(FontRelativeLength::Ex(value))),
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"ch" => Err(()),
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"rem" => Ok(Length::FontRelative(FontRelativeLength::Rem(value))),
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_ => Err(())
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}
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}
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#[inline]
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pub fn from_px(px_value: CSSFloat) -> Length {
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Length::Au(Au((px_value * AU_PER_PX) as i32))
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Length::Absolute(Au((px_value * AU_PER_PX) as i32))
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}
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}
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@ -245,7 +273,7 @@ pub mod specified {
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Ok(LengthOrPercentage::Percentage(value.unit_value))
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}
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Token::Number(ref value) if value.value == 0. => {
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Ok(LengthOrPercentage::Length(Length::Au(Au(0))))
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Ok(LengthOrPercentage::Length(Length::Absolute(Au(0))))
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}
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_ => Err(())
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}
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@ -294,7 +322,7 @@ pub mod specified {
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Ok(LengthOrPercentageOrAuto::Percentage(value.unit_value))
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}
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Token::Number(ref value) if value.value == 0. => {
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Ok(LengthOrPercentageOrAuto::Length(Length::Au(Au(0))))
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Ok(LengthOrPercentageOrAuto::Length(Length::Absolute(Au(0))))
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}
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Token::Ident(ref value) if value.eq_ignore_ascii_case("auto") => {
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Ok(LengthOrPercentageOrAuto::Auto)
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@ -345,7 +373,7 @@ pub mod specified {
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Ok(LengthOrPercentageOrNone::Percentage(value.unit_value))
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}
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Token::Number(ref value) if value.value == 0. => {
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Ok(LengthOrPercentageOrNone::Length(Length::Au(Au(0))))
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Ok(LengthOrPercentageOrNone::Length(Length::Absolute(Au(0))))
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}
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Token::Ident(ref value) if value.eq_ignore_ascii_case("none") => {
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Ok(LengthOrPercentageOrNone::None)
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@ -386,7 +414,7 @@ pub mod specified {
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Ok(PositionComponent::Percentage(value.unit_value))
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}
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Token::Number(ref value) if value.value == 0. => {
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Ok(PositionComponent::Length(Length::Au(Au(0))))
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Ok(PositionComponent::Length(Length::Absolute(Au(0))))
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}
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Token::Ident(value) => {
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match_ignore_ascii_case! { value,
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@ -736,7 +764,13 @@ pub mod computed {
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#[inline]
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fn to_computed_value(&self, context: &Context) -> Au {
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self.to_computed_value_with_font_size(context.font_size, context.root_font_size)
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match self {
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&specified::Length::Absolute(length) => length,
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&specified::Length::FontRelative(length) =>
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length.to_computed_value(context.font_size, context.root_font_size),
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&specified::Length::ServoCharacterWidth(length) =>
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length.to_computed_value(context.font_size)
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}
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}
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}
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