Bug 275892 – [Win] incorrect font metrics of Google Sans font

• Status: RESOLVED
• Resolution: FIXED
• Component: Platform

[Fujii Hironori]

Created attachment 471747 [details]
test case

Windows WebKit renders Google Sans font differently than other browsers.
https://news.google.com/home?hl=ja&gl=JP&ceid=JP:ja

[Fujii Hironori]

Pull request: https://github.com/WebKit/WebKit/pull/30257

[Fujii Hironori]

Created attachment 471761 [details]
screenshots

[Fujii Hironori]

Downloaded woff2 file and dumpped the font with fonttools.
https://fonts.gstatic.com/s/googlesans/v59/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iqcsih3SAyH6cAwhX9RPjIUvQ.woff2
https://github.com/fonttools/fonttools

Here is the oly hhea and OS_2 tables.

  <hhea>
    <tableVersion value="0x00010000"/>
    <ascent value="966"/>
    <descent value="-286"/>
    <lineGap value="0"/>
    <advanceWidthMax value="3284"/>
    <minLeftSideBearing value="-173"/>
    <minRightSideBearing value="-365"/>
    <xMaxExtent value="3284"/>
    <caretSlopeRise value="1"/>
    <caretSlopeRun value="0"/>
    <caretOffset value="0"/>
    <reserved0 value="0"/>
    <reserved1 value="0"/>
    <reserved2 value="0"/>
    <reserved3 value="0"/>
    <metricDataFormat value="0"/>
    <numberOfHMetrics value="491"/>
  </hhea>

  <OS_2>
    <!-- The fields 'usFirstCharIndex' and 'usLastCharIndex'
         will be recalculated by the compiler -->
    <version value="4"/>
    <xAvgCharWidth value="494"/>
    <usWeightClass value="400"/>
    <usWidthClass value="5"/>
    <fsType value="00000000 00000000"/>
    <ySubscriptXSize value="650"/>
    <ySubscriptYSize value="600"/>
    <ySubscriptXOffset value="0"/>
    <ySubscriptYOffset value="75"/>
    <ySuperscriptXSize value="650"/>
    <ySuperscriptYSize value="600"/>
    <ySuperscriptXOffset value="0"/>
    <ySuperscriptYOffset value="350"/>
    <yStrikeoutSize value="84"/>
    <yStrikeoutPosition value="306"/>
    <sFamilyClass value="0"/>
    <panose>
      <bFamilyType value="0"/>
      <bSerifStyle value="0"/>
      <bWeight value="0"/>
      <bProportion value="0"/>
      <bContrast value="0"/>
      <bStrokeVariation value="0"/>
      <bArmStyle value="0"/>
      <bLetterForm value="0"/>
      <bMidline value="0"/>
      <bXHeight value="0"/>
    </panose>
    <ulUnicodeRange1 value="10000000 00000000 00000000 01100111"/>
    <ulUnicodeRange2 value="00000000 00000000 00000000 01101011"/>
    <ulUnicodeRange3 value="00000000 00000000 00000000 00101000"/>
    <ulUnicodeRange4 value="00000000 00000000 00000000 00000000"/>
    <achVendID value="GOOG"/>
    <fsSelection value="00000000 11000000"/>
    <usFirstCharIndex value="13"/>
    <usLastCharIndex value="65533"/>
    <sTypoAscender value="966"/>
    <sTypoDescender value="-286"/>
    <sTypoLineGap value="0"/>
    <usWinAscent value="1323"/>
    <usWinDescent value="1079"/>
    <ulCodePageRange1 value="00100000 00000001 00000001 10111111"/>
    <ulCodePageRange2 value="00000000 00000000 00000000 00000000"/>
    <sxHeight value="510"/>
    <sCapHeight value="716"/>
    <usDefaultChar value="0"/>
    <usBreakChar value="32"/>
    <usMaxContext value="18"/>
  </OS_2>

hhea and typo has same ascent, descent and lineGap.
But, big winAscent nd winDescent.
fsSelection has 0x80 bit (USE_TYPO_METRICS).

[EWS]

Committed 280480@main (0df29c6b290b): <https://commits.webkit.org/280480@main>

Reviewed commits have been landed. Closing PR #30257 and removing active labels.

[Radar WebKit Bug Importer]

<rdar://problem/130780042>