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47 lines
1.4 KiB
47 lines
1.4 KiB
2 years ago
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'use strict';
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// See documentation here: http://www.microsoft.com/typography/otspec/maxp.htm
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var _ = require('lodash');
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var ByteBuffer = require('microbuffer');
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// Find max points in glyph TTF contours.
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function getMaxPoints(font) {
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return _.max(_.map(font.glyphs, function (glyph) {
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return _.reduce(glyph.ttfContours, function (sum, ctr) { return sum + ctr.length; }, 0);
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}));
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}
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function getMaxContours(font) {
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return _.max(_.map(font.glyphs, function (glyph) {
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return glyph.ttfContours.length;
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}));
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}
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function createMaxpTable(font) {
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var buf = new ByteBuffer(32);
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buf.writeInt32(0x10000); // version
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buf.writeUint16(font.glyphs.length); // numGlyphs
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buf.writeUint16(getMaxPoints(font)); // maxPoints
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buf.writeUint16(getMaxContours(font)); // maxContours
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buf.writeUint16(0); // maxCompositePoints
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buf.writeUint16(0); // maxCompositeContours
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buf.writeUint16(2); // maxZones
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buf.writeUint16(0); // maxTwilightPoints
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// It is unclear how to calculate maxStorage, maxFunctionDefs and maxInstructionDefs.
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// These are magic constants now, with values exceeding values from FontForge
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buf.writeUint16(10); // maxStorage
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buf.writeUint16(10); // maxFunctionDefs
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buf.writeUint16(0); // maxInstructionDefs
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buf.writeUint16(255); // maxStackElements
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buf.writeUint16(0); // maxSizeOfInstructions
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buf.writeUint16(0); // maxComponentElements
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buf.writeUint16(0); // maxComponentDepth
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return buf;
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}
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module.exports = createMaxpTable;
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