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stylo: Handle quirks mode on font base sizes

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canova committed Sep 27, 2017
1 parent 35ad031 commit 6ac5e9c3fa9903f5ce58cff81e9082ac7d65357e
Showing with 29 additions and 3 deletions.
  1. +29 −3 components/style/values/specified/font.rs
@@ -168,6 +168,7 @@ impl ToComputedValue for KeywordSize {
type ComputedValue = NonNegativeLength;
#[inline]
fn to_computed_value(&self, cx: &Context) -> NonNegativeLength {
use context::QuirksMode;
use values::specified::length::au_to_int_px;
// Data from nsRuleNode.cpp in Gecko
// Mapping from base size and HTML size to pixels
@@ -188,9 +189,29 @@ impl ToComputedValue for KeywordSize {
[9, 10, 13, 16, 18, 24, 32, 48]
];

static FONT_SIZE_FACTORS: [i32; 8] = [60, 75, 89, 100, 120, 150, 200, 300];
// Data from nsRuleNode.cpp in Gecko
// (https://dxr.mozilla.org/mozilla-central/rev/35fbf14b9/layout/style/nsRuleNode.cpp#3303)
//
// This table gives us compatibility with WinNav4 for the default fonts only.
// In WinNav4, the default fonts were:
//
// Times/12pt == Times/16px at 96ppi
// Courier/10pt == Courier/13px at 96ppi
//
// xxs xs s m l xl xxl -
// - 1 2 3 4 5 6 7
static QUIRKS_FONT_SIZE_MAPPING: [[i32; 8]; 8] = [
[9, 9, 9, 9, 11, 14, 18, 28],
[9, 9, 9, 10, 12, 15, 20, 31],
[9, 9, 9, 11, 13, 17, 22, 34],
[9, 9, 10, 12, 14, 18, 24, 37],
[9, 9, 10, 13, 16, 20, 26, 40],
[9, 9, 11, 14, 17, 21, 28, 42],
[9, 10, 12, 15, 17, 23, 30, 45],
[9, 10, 13, 16, 18, 24, 32, 48]
];

// XXXManishearth handle quirks mode (bug 1401322)
static FONT_SIZE_FACTORS: [i32; 8] = [60, 75, 89, 100, 120, 150, 200, 300];

let ref gecko_font = cx.style().get_font().gecko();
let base_size = unsafe { Atom::with(gecko_font.mLanguage.mRawPtr, |atom| {
@@ -200,7 +221,12 @@ impl ToComputedValue for KeywordSize {
let base_size_px = au_to_int_px(base_size as f32);
let html_size = self.html_size() as usize;
if base_size_px >= 9 && base_size_px <= 16 {
Au::from_px(FONT_SIZE_MAPPING[(base_size_px - 9) as usize][html_size]).into()
let mapping = if cx.quirks_mode == QuirksMode::Quirks {
QUIRKS_FONT_SIZE_MAPPING
} else {
FONT_SIZE_MAPPING
};
Au::from_px(mapping[(base_size_px - 9) as usize][html_size]).into()
} else {
Au(FONT_SIZE_FACTORS[html_size] * base_size / 100).into()
}

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