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Use correct reference data for AFM values #129

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Merged
merged 1 commit into from
Dec 30, 2023
Merged

Use correct reference data for AFM values #129

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43 changes: 39 additions & 4 deletions src/FontLib/AdobeFontMetrics.php
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Original file line number Diff line number Diff line change
Expand Up @@ -75,12 +75,49 @@ function write($file, $encoding = null) {

if (isset($hhea["ascent"])) {
$this->addPair("FontHeightOffset", $font->normalizeFUnit($hhea["lineGap"]));
$this->addPair("Ascender", $font->normalizeFUnit($hhea["ascent"]));
$this->addPair("Descender", $font->normalizeFUnit($hhea["descent"]));
}
else {
$this->addPair("FontHeightOffset", $font->normalizeFUnit($os2["typoLineGap"]));
}

$glyf = $font->getData("glyf");
$glyphIndexArray = $font->getUnicodeCharMap();

// capHeight is based on capital H
if (\array_key_exists(72, $glyphIndexArray)) {
$upperH = $glyf[$glyphIndexArray[72]];
$upperH->parseData();
$this->addPair("CapHeight", $font->normalizeFUnit($upperH->yMax));
}

// xHeight is based on lowercase x
if (\array_key_exists(120, $glyphIndexArray)) {
$lowerX = $glyf[$glyphIndexArray[120]];
$lowerX->parseData();
$this->addPair("XHeight", $font->normalizeFUnit($lowerX->yMax));
}

// ascender is based on lowercase d
if (\array_key_exists(100, $glyphIndexArray)) {
$lowerD = $glyf[$glyphIndexArray[100]];
$lowerD->parseData();
$this->addPair("Ascender", $font->normalizeFUnit($lowerD->yMax));
} elseif (isset($hhea["ascent"])) {
$this->addPair("Ascender", $font->normalizeFUnit($hhea["ascent"]));
}
else {
$this->addPair("Ascender", $font->normalizeFUnit($os2["typoAscender"]));
}

// descender is based on lowercase p
if (\array_key_exists(112, $glyphIndexArray)) {
$lowerP = $glyf[$glyphIndexArray[112]];
$lowerP->parseData();
$this->addPair("Descender", $font->normalizeFUnit($lowerP->yMin));
} elseif (isset($hhea["ascent"])) {
$this->addPair("Descender", $font->normalizeFUnit($hhea["descent"]));
}
else {
$this->addPair("Descender", -abs($font->normalizeFUnit($os2["typoDescender"])));
}

Expand All @@ -92,8 +129,6 @@ function write($file, $encoding = null) {
$font->normalizeFUnit($head["yMax"]),
));

$glyphIndexArray = $font->getUnicodeCharMap();

if ($glyphIndexArray) {
$hmtx = $font->getData("hmtx");
$names = $font->getData("post", "names");
Expand Down