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gfx: Change the mapping from Mac weights to CSS weights so that 0.0 maps

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to 400, not 500.

CSS `normal` font-weight is specified as 400, while Mac "Regular" font
weight is reported as 0.0. On the Mac, we need to center the two ranges
on the same value to avoid choosing "Light" fonts where "Regular" would
have been more appropriate.

Closes #9487.

fix for mac
This commit is contained in:
Patrick Walton 2016-05-09 16:00:16 -07:00
parent 479c6c9c42
commit 3addd775a5
1 changed files with 14 additions and 10 deletions
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24
components/gfx/platform/macos/font.rs
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@ -103,16 +103,20 @@ impl FontHandleMethods for FontHandle {
fn boldness(&self) -> font_weight::T {
let normalized = self.ctfont.all_traits().normalized_weight(); // [-1.0, 1.0]
let normalized = (normalized + 1.0) / 2.0 * 9.0; // [0.0, 9.0]
match normalized {
v if v < 1.0 => font_weight::T::Weight100,
v if v < 2.0 => font_weight::T::Weight200,
v if v < 3.0 => font_weight::T::Weight300,
v if v < 4.0 => font_weight::T::Weight400,
v if v < 5.0 => font_weight::T::Weight500,
v if v < 6.0 => font_weight::T::Weight600,
v if v < 7.0 => font_weight::T::Weight700,
v if v < 8.0 => font_weight::T::Weight800,
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
match normalized.round() as u32 {
1 => font_weight::T::Weight100,
2 => font_weight::T::Weight200,
3 => font_weight::T::Weight300,
4 => font_weight::T::Weight400,
5 => font_weight::T::Weight500,
6 => font_weight::T::Weight600,
7 => font_weight::T::Weight700,
8 => font_weight::T::Weight800,
_ => font_weight::T::Weight900,
}
}