Add a basic non-working OTF generator
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Vivien Nicolas
parent
a73ffc2d30
commit
865b393367
244
PDFFont.js
244
PDFFont.js
@ -798,6 +798,13 @@ Type1Font.prototype = {
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return bytes;
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},
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bytesToInteger: function(aBytesArray) {
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var value = 0;
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for (var i = 0; i < aBytesArray.length; i++)
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value = (value << 8) + aBytesArray[i];
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return value;
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},
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encodeNumber: function(aValue) {
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var x = 0;
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// XXX we don't really care about Type2 optimization here...
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@ -835,7 +842,7 @@ Type1Font.prototype = {
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charstringsCount++;
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charstringsDataLength += glyphs[glyph].length;
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}
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log("There is " + charstringsCount + " glyphs (size: " + charstringsDataLength + ")");
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//log("There is " + charstringsCount + " glyphs (size: " + charstringsDataLength + ")");
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// Create a CFF font data
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var cff = new Uint8Array(20000);
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@ -1021,7 +1028,242 @@ Type1Font.prototype = {
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return data;
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},
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createOpenTypeHeader: function(aNumTables) {
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// sfnt version (4 bytes)
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var version = [0x4F, 0x54, 0x54, 0X4F];
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// numTables (2 bytes)
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var numTables = aNumTables;
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// searchRange (2bytes)
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// XXX oh man this is dirty, there's probably something obvious to do to
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// quickly get the maximum power of 2 value...
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var maxPower = 0;
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var value = numTables;
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while (value >= 2) {
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value /= 2;
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maxPower++;
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}
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value = 2;
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for (var i = 1; i < maxPower; i++)
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value *= 2;
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var searchRange = value * 16;
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// entrySelector (2 bytes)
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var entrySelector = Math.log(value) / Math.log(2);
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// rangeShift (2 bytes)
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var rangeShift = numTables * 16 - searchRange;
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return [].concat(version,
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this.integerToBytes(numTables, 2),
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this.integerToBytes(searchRange, 2),
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this.integerToBytes(entrySelector, 2),
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this.integerToBytes(rangeShift, 2));
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},
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createTableEntry: function(aTag, aOffset, aData) {
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// tag
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var tag = [
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aTag.charCodeAt(0),
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aTag.charCodeAt(1),
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aTag.charCodeAt(2),
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aTag.charCodeAt(3)
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];
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// offset
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var offset = aOffset;
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// length
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var length = aData.length;
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// checksum
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var checksum = this.bytesToInteger(tag) + offset + length;
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return [].concat(tag,
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this.integerToBytes(checksum, 4),
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this.integerToBytes(offset, 4),
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this.integerToBytes(length, 4));
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},
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convertToOTF: function(aData, aFont) {
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var otf = new Uint8Array(20000);
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var currentOffset = 0;
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var header = this.createOpenTypeHeader(9);
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otf.set(header, currentOffset);
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currentOffset += header.length;
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var tablesLength = 9 * 16;
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var virtualOffset = tablesLength + currentOffset;
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var tableEntry = this.createTableEntry("CFF ", tablesLength + currentOffset, aData);
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otf.set(tableEntry, currentOffset);
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currentOffset += tableEntry.length;
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virtualOffset += aData.length;
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var OS2 = [
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0x00, 0x03, // version
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0x02, 0x24, // xAvgCharWidth
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0x01, 0xF4, // usWeightClass
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0x00, 0x05, // usWidthClass
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0x00, 0x00, // fstype
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0x02, 0x8A, // ySubscriptXSize
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0x02, 0xBB, // ySubscriptYSize
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0x00, 0x00, // ySubscriptXOffset
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0x00, 0x8C, // ySubscriptYOffset
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0x02, 0x8A, // ySuperScriptXSize
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0x02, 0xBB, // ySuperScriptYSize
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0x00, 0x00, // ySuperScriptXOffset
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0x01, 0xDF, // ySuperScriptYOffset
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0x00, 0x31, // yStrikeOutSize
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0x01, 0x02, // yStrikeOutPosition
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0x00, 0x00, // sFamilyClass
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0x02, 0x00, 0x06, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Panose
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0x00, 0x00, 0x00, 0x01, // ulUnicodeRange1 (Bits 0-31)
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0x00, 0x00, 0x00, 0x00, // ulUnicodeRange2 (Bits 32-63)
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0x00, 0x00, 0x00, 0x00, // ulUnicodeRange3 (Bits 64-95)
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0x00, 0x00, 0x00, 0x00, // ulUnicodeRange4 (Bits 96-127)
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0x47, 0x49, 0x60, 0x20, // achVendID
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0x00, 0x20, // fsSelection
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0x00, 0x2D, // usFirstCharIndex
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0x00, 0x7A, // usLastCharIndex
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0x03, // sTypoAscender
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0x20, // sTypeDescender
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0x00, 0x38, // sTypoLineGap
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0x00, 0x5A, // usWinAscent
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0x02, 0xB4, // usWinDescent
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0x00, 0xCE, 0x00, 0x00, // ulCodePageRange1 (Bits 0-31)
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0x00, 0x01, 0x00, 0x00, // ulCodePageRange2 (Bits 32-63)
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0x00, // sxHeight
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0x00, // sCapHeight
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0x01, // usDefaultChar
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0xCD, // usBreakChar
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0x02 // usMaxContext
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];
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var tableEntry = this.createTableEntry("OS/2", virtualOffset, OS2);
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otf.set(tableEntry, currentOffset);
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currentOffset += tableEntry.length;
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virtualOffset += OS2.length;
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var cmap = [
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0x00, 0x00, // version
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0x00, 0x00 // numTables
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];
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var tableEntry = this.createTableEntry("cmap", virtualOffset, cmap);
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//otf.set(tableEntry, currentOffset);
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currentOffset += tableEntry.length;
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virtualOffset += cmap.length;
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var name = [
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0x00, 0x00, // format
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0x00, 0x00, // Number of names Record
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0x00, 0x00 // Storage
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];
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var tableEntry = this.createTableEntry("name", virtualOffset, name);
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otf.set(tableEntry, currentOffset);
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currentOffset += tableEntry.length;
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virtualOffset += name.length;
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var hmtx = [
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0x01, 0xF4, 0x00,
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0x00
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];
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var tableEntry = this.createTableEntry("hmtx", virtualOffset, hmtx);
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otf.set(tableEntry, currentOffset);
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currentOffset += tableEntry.length;
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virtualOffset += hmtx.length;
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var maxp = [
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0x00, 0x00, 0x50, 0x00, // Version number
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0x00, 0x01 // Nums of glyphs
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];
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var tableEntry = this.createTableEntry("maxp", virtualOffset, maxp);
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otf.set(tableEntry, currentOffset);
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currentOffset += tableEntry.length;
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virtualOffset += maxp.length;
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var head = [
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0x00, 0x01, 0x00, 0x00, // Version number
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0x00, 0x00, 0x50, 0x00, // fontRevision
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0x00, 0x00, 0x00, 0x00, // checksumAdjustement
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0x5F, 0x0F, 0x3C, 0xF5, // magicNumber
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0x00, 0x00, // Flags
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0x00, 0x00, // unitsPerEM
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // created
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // modified
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0x00, 0x00, // xMin
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0x00, 0x00, // yMin
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0x00, 0x00, // xMax
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0x00, 0x00, // yMax
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0x00, 0x00, // macStyle
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0x00, 0x00, // lowestRecPPEM
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0x00, 0x00, // fontDirectionHint
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0x00, 0x00, // indexToLocFormat
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0x00, 0x00 // glyphDataFormat
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];
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var tableEntry = this.createTableEntry("head", virtualOffset, head);
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otf.set(tableEntry, currentOffset);
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currentOffset += tableEntry.length;
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virtualOffset += head.length;
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var hhea = [
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0x00, 0x01, 0x00, 0x00, // Version number
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0x00, 0x00, // Typographic Ascent
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0x00, 0x00, // Typographic Descent
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0x00, 0x00, // Line Gap
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0x01, 0xF4, // advanceWidthMax
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0x00, 0x00, // minLeftSidebearing
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0x00, 0x00, // minRightSidebearing
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0x00, 0x00, // xMaxExtent
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0x00, 0x00, // caretSlopeRise
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0x00, 0x00, // caretOffset
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0x00, 0x00, // -reserved-
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0x00, 0x00, // -reserved-
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0x00, 0x00, // -reserved-
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0x00, 0x00, // -reserved-
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0x00, 0x00, // metricDataFormat
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0x00, 0x01 // numberOfHMetrics
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];
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var tableEntry = this.createTableEntry("hhea", virtualOffset, hhea);
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otf.set(tableEntry, currentOffset);
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currentOffset += tableEntry.length;
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virtualOffset += hhea.length;
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var post = [
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0x00, 0x03, 0x00, 0x00, // Version number
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0x00, 0x00, 0x01, 0x00, // italicAngle
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0x00, 0x00, // underlinePosition
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0x00, 0x00, // underlineThickness
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0x00, 0x00, 0x00, 0x01, // isFixedPitch
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0x00, 0x00, 0x00, 0x00, // minMemType42
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0x00, 0x00, 0x00, 0x00, // maxMemType42
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0x00, 0x00, 0x00, 0x00, // minMemType1
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0x00, 0x00, 0x00, 0x00 // maxMemType1
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];
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var tableEntry = this.createTableEntry("post", virtualOffset, post);
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otf.set(tableEntry, currentOffset);
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currentOffset += tableEntry.length;
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virtualOffset += post.length;
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// Set the CFF data
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otf.set(aData, currentOffset);
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currentOffset += aData.length;
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var data = [];
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for (var i = 0; i < currentOffset; i++)
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data.push(otf[i]);
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writeToFile(data, "/tmp/pdf.js.otf");
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}
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};
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