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Fixes incorrect PDF file font metrics.

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This commit is contained in:
Yury Delendik 2015-11-06 14:47:10 -06:00
parent 9e66625092
commit cc5bc18728
1 changed files with 15 additions and 11 deletions
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26
src/core/fonts.js
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@ -4152,6 +4152,20 @@ var Font = (function FontClosure() {
tables.hhea.data[11] = 0xFF; tables.hhea.data[11] = 0xFF;
} }
// Extract some more font properties from the OpenType head and
// hhea tables; yMin and descent value are always negative.
var metricsOverride = {
unitsPerEm: int16(tables.head.data[18], tables.head.data[19]),
yMax: int16(tables.head.data[42], tables.head.data[43]),
yMin: int16(tables.head.data[38], tables.head.data[39]) - 0x10000,
ascent: int16(tables.hhea.data[4], tables.hhea.data[5]),
descent: int16(tables.hhea.data[6], tables.hhea.data[7]) - 0x10000
};
// PDF FontDescriptor metrics lie -- using data from actual font.
this.ascent = metricsOverride.ascent / metricsOverride.unitsPerEm;
this.descent = metricsOverride.descent / metricsOverride.unitsPerEm;
// The 'post' table has glyphs names. // The 'post' table has glyphs names.
if (tables.post) { if (tables.post) {
var valid = readPostScriptTable(tables.post, properties, numGlyphs); var valid = readPostScriptTable(tables.post, properties, numGlyphs);
@ -4318,20 +4332,10 @@ var Font = (function FontClosure() {
}; };
if (!tables['OS/2'] || !validateOS2Table(tables['OS/2'])) { if (!tables['OS/2'] || !validateOS2Table(tables['OS/2'])) {
// extract some more font properties from the OpenType head and
// hhea tables; yMin and descent value are always negative
var override = {
unitsPerEm: int16(tables.head.data[18], tables.head.data[19]),
yMax: int16(tables.head.data[42], tables.head.data[43]),
yMin: int16(tables.head.data[38], tables.head.data[39]) - 0x10000,
ascent: int16(tables.hhea.data[4], tables.hhea.data[5]),
descent: int16(tables.hhea.data[6], tables.hhea.data[7]) - 0x10000
};
tables['OS/2'] = { tables['OS/2'] = {
tag: 'OS/2', tag: 'OS/2',
data: createOS2Table(properties, newMapping.charCodeToGlyphId, data: createOS2Table(properties, newMapping.charCodeToGlyphId,
override) metricsOverride)
}; };
} }