style: Fixups for css-fonts-4 font-weight.

components/gfx/font_template.rs

@@ -20,7 +20,7 @@ use style::values::computed::font::FontWeight;
 /// to be expanded or refactored when we support more of the font styling parameters.
 ///
 /// NB: If you change this, you will need to update `style::properties::compute_font_hash()`.
-#[derive(Clone, Copy, Debug, Deserialize, Eq, Hash, Serialize)]
+#[derive(Clone, Copy, Debug, Deserialize, Serialize)]
 pub struct FontTemplateDescriptor {
     pub weight: FontWeight,
     pub stretch: FontStretch,
@@ -29,12 +29,15 @@ pub struct FontTemplateDescriptor {
 
 impl FontTemplateDescriptor {
     #[inline]
-    pub fn new(weight: FontWeight, stretch: FontStretch, italic: bool)
-               -> FontTemplateDescriptor {
-        FontTemplateDescriptor {
-            weight: weight,
-            stretch: stretch,
-            italic: italic,
+    pub fn new(
+        weight: FontWeight,
+        stretch: FontStretch,
+        italic: bool,
+    ) -> Self {
+        Self {
+            weight,
+            stretch,
+            italic,
         }
     }
 

components/gfx/platform/freetype/font.rs

@@ -154,19 +154,12 @@ impl FontHandleMethods for FontHandle {
     }
 
     fn boldness(&self) -> FontWeight {
-        if let Some(os2) = self.os2_table() {
-            let weight = os2.us_weight_class as i32;
-
-            if weight < 10 {
-                FontWeight::from_int(weight * 100).unwrap()
-            } else if weight >= 100 && weight < 1000 {
-                FontWeight::from_int(weight / 100 * 100).unwrap()
-            } else {
-                FontWeight::normal()
-            }
-        } else {
-            FontWeight::normal()
-        }
+        let os2 = match self.os2_table() {
+            None => return FontWeight::normal(),
+            Some(os2) => os2,
+        };
+        let weight = os2.us_weight_class as f32;
+        FontWeight(weight.max(1.).min(1000.))
     }
 
     fn stretchiness(&self) -> FontStretch {

components/gfx/platform/macos/font.rs

@@ -210,12 +210,14 @@ impl FontHandleMethods for FontHandle {
 
     fn boldness(&self) -> FontWeight {
         let normalized = self.ctfont.all_traits().normalized_weight();  // [-1.0, 1.0]
+        // TODO(emilio): It may make sense to make this range [.01, 10.0], to
+        // align with css-fonts-4's range of [1, 1000].
         let normalized = if normalized <= 0.0 {
             4.0 + normalized * 3.0  // [1.0, 4.0]
         } else {
             4.0 + normalized * 5.0  // [4.0, 9.0]
         }; // [1.0, 9.0], centered on 4.0
-        FontWeight::from_int(normalized.round() as i32 * 100).unwrap()
+        FontWeight(normalized as f32 * 100.)
     }
 
     fn stretchiness(&self) -> FontStretch {

components/gfx/platform/windows/font.rs

@@ -157,10 +157,7 @@ impl FontInfo {
             },
         };
 
-        let weight =
-            StyleFontWeight::from_int(
-                min(9, max(1, weight_val as i32 / 100)) * 100
-            ).unwrap();
+        let weight = StyleFontWeight(weight_val as f32);
 
         let stretch = match min(9, max(1, width_val)) {
             1 => StyleFontStretch::UltraCondensed,
@@ -184,28 +181,28 @@ impl FontInfo {
         Ok(FontInfo {
             family_name: family,
             face_name: face,
-            weight: weight,
-            stretch: stretch,
-            style: style,
+            weight,
+            stretch,
+            style,
         })
     }
 
     fn new_from_font(font: &Font) -> Result<FontInfo, ()> {
         let style = font.style();
         let weight = StyleFontWeight(match font.weight() {
-            FontWeight::Thin => 100,
-            FontWeight::ExtraLight => 200,
-            FontWeight::Light => 300,
+            FontWeight::Thin => 100.,
+            FontWeight::ExtraLight => 200.,
+            FontWeight::Light => 300.,
             // slightly grayer gray
-            FontWeight::SemiLight => 300,
-            FontWeight::Regular => 400,
-            FontWeight::Medium => 500,
-            FontWeight::SemiBold => 600,
-            FontWeight::Bold => 700,
-            FontWeight::ExtraBold => 800,
-            FontWeight::Black => 900,
+            FontWeight::SemiLight => 300.,
+            FontWeight::Regular => 400.,
+            FontWeight::Medium => 500.,
+            FontWeight::SemiBold => 600.,
+            FontWeight::Bold => 700.,
+            FontWeight::ExtraBold => 800.,
+            FontWeight::Black => 900.,
             // slightly blacker black
-            FontWeight::ExtraBlack => 900,
+            FontWeight::ExtraBlack => 1000.,
         });
         let stretch = match font.stretch() {
             FontStretch::Undefined => StyleFontStretch::Normal,
@@ -223,9 +220,9 @@ impl FontInfo {
         Ok(FontInfo {
             family_name: font.family_name(),
             face_name: font.face_name(),
-            style: style,
-            weight: weight,
-            stretch: stretch,
+            style,
+            weight,
+            stretch,
         })
     }
 }

components/style/font_face.rs

@@ -27,7 +27,8 @@ use style_traits::{StyleParseErrorKind, ToCss};
 use style_traits::values::SequenceWriter;
 use values::computed::font::FamilyName;
 #[cfg(feature = "gecko")]
-use values::specified::font::{AbsoluteFontWeight, SpecifiedFontFeatureSettings, SpecifiedFontVariationSettings};
+use values::specified::font::{SpecifiedFontFeatureSettings, SpecifiedFontVariationSettings};
+use values::specified::font::AbsoluteFontWeight;
 use values::specified::url::SpecifiedUrl;
 
 /// A source for a font-face rule.

components/style/gecko/rules.rs

@@ -15,8 +15,8 @@ use properties::longhands::font_language_override;
 use std::str;
 use values::computed::font::FamilyName;
 use values::generics::font::FontTag;
-use values::specified::font::AbsoluteFontWeight;
 use values::specified::font::{SpecifiedFontFeatureSettings, SpecifiedFontVariationSettings};
+use values::specified::font::AbsoluteFontWeight;
 
 impl<'a> ToNsCssValue for &'a FamilyName {
     fn convert(self, nscssvalue: &mut nsCSSValue) {

components/style/properties/properties.mako.rs

@@ -2243,7 +2243,7 @@ pub mod style_structs {
                     // Corresponds to the fields in
                     // `gfx::font_template::FontTemplateDescriptor`.
                     let mut hasher: FnvHasher = Default::default();
-                    hasher.write_u16(self.font_weight.0);
+                    self.font_weight.hash(&mut hasher);
                     self.font_stretch.hash(&mut hasher);
                     self.font_family.hash(&mut hasher);
                     self.hash = hasher.finish()

components/style/values/computed/font.rs

@@ -15,7 +15,6 @@ use gecko_bindings::sugar::refptr::RefPtr;
 #[cfg(feature = "gecko")]
 use malloc_size_of::{MallocSizeOf, MallocSizeOfOps};
 use std::fmt::{self, Write};
-#[cfg(feature = "gecko")]
 use std::hash::{Hash, Hasher};
 #[cfg(feature = "servo")]
 use std::slice;
@@ -123,6 +122,16 @@ impl FontWeight {
     }
 }
 
+impl Hash for FontWeight {
+    fn hash<H>(&self, state: &mut H)
+    where
+        H: Hasher,
+    {
+        // We hash the floating point number with four decimal places.
+        state.write_u32((self.0 * 10000.).trunc() as u32)
+    }
+}
+
 impl FontSize {
     /// The actual computed font size.
     pub fn size(self) -> Au {

tests/unit/style/parsing/font.rs

@@ -1,17 +0,0 @@
-/* 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 http://mozilla.org/MPL/2.0/. */
-
-use parsing::parse;
-use style::properties::longhands::font_weight;
-
-#[test]
-fn font_weight_keyword_should_preserve_keyword() {
-    use style::properties::longhands::font_weight::SpecifiedValue;
-
-    let result = parse(font_weight::parse, "normal").unwrap();
-    assert_eq!(result, SpecifiedValue::Normal);
-
-    let result = parse(font_weight::parse, "bold").unwrap();
-    assert_eq!(result, SpecifiedValue::Bold);
-}

tests/unit/style/parsing/mod.rs

@@ -109,7 +109,6 @@ mod border;
 mod box_;
 mod column;
 mod effects;
-mod font;
 mod image;
 mod inherited_text;
 mod length;