Support font with characters below 0x20 declared in format 1 cmap and be more general about the TrueType rewritting cases
This commit is contained in:
Vivien Nicolas
parent
910d807759
commit
10e9694135
295
fonts.js
295
fonts.js
@ -372,7 +372,7 @@ function getUnicodeRangeFor(value) {
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* var type1Font = new Font("MyFontName", binaryFile, propertiesObject);
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* type1Font.bind();
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*/
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var Font = (function() {
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var Font = (function Font() {
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var constructor = function font_constructor(name, file, properties) {
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this.name = name;
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this.textMatrix = properties.textMatrix || IDENTITY_MATRIX;
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@ -531,6 +531,19 @@ var Font = (function() {
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}
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ranges.push([start, end]);
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}
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// Removes duplicate ranges
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for (var i = ranges.length - 1; i > 0; i--) {
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var range = [];
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var range1 = ranges[i];
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var range2 = ranges[i - 1];
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if (range1[0] == range2[1]) {
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range2[0] = range2[0] - 1;
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range2[1] = range1[1];
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ranges.splice(i, 1);
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}
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}
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return ranges;
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};
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@ -790,21 +803,57 @@ var Font = (function() {
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};
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function replaceCMapTable(cmap, font, properties) {
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font.pos = (font.start ? font.start : 0) + cmap.length;
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var start = (font.start ? font.start : 0) + cmap.length;
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font.pos = start;
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var version = int16(font.getBytes(2));
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var numTables = int16(font.getBytes(2));
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var numRecords = int16(font.getBytes(2));
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for (var i = 0; i < numTables; i++) {
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var platformID = int16(font.getBytes(2));
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var encodingID = int16(font.getBytes(2));
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var offset = int32(font.getBytes(4));
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var records = [];
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for (var i = 0; i < numRecords; i++) {
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records.push({
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platformID: int16(font.getBytes(2)),
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encodingID: int16(font.getBytes(2)),
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offset: int32(font.getBytes(4))
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});
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};
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for (var i = 0; i < numRecords; i++) {
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var table = records[i];
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font.pos = start + table.offset;
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var format = int16(font.getBytes(2));
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var length = int16(font.getBytes(2));
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var language = int16(font.getBytes(2));
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if ((format == 0 && numTables == 1) ||
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(format == 6 && numTables == 1 && !properties.encoding.empty)) {
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if (format == 0 && numRecords > 1) {
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// Characters below 0x20 are controls characters that are hardcoded
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// into the platform so if some characters in the font are assigned
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// under this limit they will not be displayed so let's rewrite the
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// CMap.
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var map = [];
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var rewrite = false;
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for (var j = 0; j < 256; j++) {
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var index = font.getByte();
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if (index != 0) {
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map.push(index);
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if (j < 0x20)
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rewrite = true;
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}
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}
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if (rewrite) {
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var glyphs = [];
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for (var j = 0x20; j < 256; j++) {
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// TODO do not hardcode WinAnsiEncoding
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var unicode = GlyphsUnicode[Encodings["WinAnsiEncoding"][j]];
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glyphs.push({ unicode: unicode });
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}
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cmap.data = createCMapTable(glyphs, true);
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}
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} else if ((format == 0 && numRecords == 1) ||
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(format == 6 && numRecords == 1 && !properties.encoding.empty)) {
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// Format 0 alone is not allowed by the sanitizer so let's rewrite
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// that to a 3-1-4 Unicode BMP table
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TODO('Use an other source of informations than ' +
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@ -818,7 +867,7 @@ var Font = (function() {
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}
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cmap.data = createCMapTable(glyphs);
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} else if (format == 6 && numTables == 1) {
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} else if (format == 6 && numRecords == 1) {
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// Format 6 is a 2-bytes dense mapping, which means the font data
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// lives glue together even if they are pretty far in the unicode
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// table. (This looks weird, so I can have missed something), this
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@ -871,10 +920,7 @@ var Font = (function() {
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var header = readOpenTypeHeader(font);
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var numTables = header.numTables;
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// This keep a reference to the CMap and the post tables since they can
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// be rewritted
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var cmap, post, nameTable, maxp;
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var cmap, maxp;
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var tables = [];
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for (var i = 0; i < numTables; i++) {
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var table = readTableEntry(font);
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@ -882,10 +928,6 @@ var Font = (function() {
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if (index != -1) {
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if (table.tag == 'cmap')
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cmap = table;
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else if (table.tag == 'post')
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post = table;
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else if (table.tag == 'name')
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nameTable = table;
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else if (table.tag == 'maxp')
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maxp = table;
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@ -894,136 +936,127 @@ var Font = (function() {
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tables.push(table);
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}
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// If any tables are still in the array this means some required
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// tables are missing, which means that we need to rebuild the
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// font in order to pass the sanitizer.
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if (requiredTables.length && requiredTables[0] == 'OS/2') {
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// Create a new file to hold the new version of our truetype with a new
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// header and new offsets
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var ttf = new Uint8Array(kMaxFontFileSize);
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// Create a new file to hold the new version of our truetype with a new
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// header and new offsets
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var ttf = new Uint8Array(kMaxFontFileSize);
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// The offsets object holds at the same time a representation of where
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// to write the table entry information about a table and another offset
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// representing the offset where to put the actual data of a particular
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// table
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var numTables = header.numTables + requiredTables.length;
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var offsets = {
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currentOffset: 0,
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virtualOffset: numTables * (4 * 4)
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};
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// The offsets object holds at the same time a representation of where
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// to write the table entry information about a table and another offset
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// representing the offset where to put the actual data of a particular
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// table
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var numTables = header.numTables + requiredTables.length;
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var offsets = {
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currentOffset: 0,
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virtualOffset: numTables * (4 * 4)
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};
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// The new numbers of tables will be the last one plus the num
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// of missing tables
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createOpenTypeHeader('\x00\x01\x00\x00', ttf, offsets, numTables);
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// The new numbers of tables will be the last one plus the num
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// of missing tables
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createOpenTypeHeader('\x00\x01\x00\x00', ttf, offsets, numTables);
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// Insert the missing table
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if (requiredTables.indexOf('OS/2') != -1) {
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tables.push({
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tag: 'OS/2',
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data: stringToArray(createOS2Table(properties))
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});
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}
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// Replace the old CMAP table with a shiny new one
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if (properties.type == 'CIDFontType2') {
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// Type2 composite fonts map characters directly to glyphs so the cmap
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// table must be replaced.
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// Replace the old CMAP table with a shiny new one
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if (properties.type == 'CIDFontType2') {
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// Type2 composite fonts map characters directly to glyphs so the cmap
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// table must be replaced.
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var glyphs = [];
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var charset = properties.charset;
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if (!charset.length) {
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// PDF did not contain a GIDMap for the font so create an identity cmap
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var glyphs = [];
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var charset = properties.charset;
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if (!charset.length) {
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// PDF did not contain a GIDMap for the font so create an identity cmap
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// First get the number of glyphs from the maxp table
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font.pos = (font.start ? font.start : 0) + maxp.length;
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var version = int16(font.getBytes(4));
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var numGlyphs = int16(font.getBytes(2));
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// First get the number of glyphs from the maxp table
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font.pos = (font.start ? font.start : 0) + maxp.length;
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var version = int16(font.getBytes(4));
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var numGlyphs = int16(font.getBytes(2));
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// Now create an identity mapping
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for (var i = 1; i < numGlyphs; i++) {
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glyphs.push({
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unicode: i
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});
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}
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} else {
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for (var i = 1; i < charset.length; i++) {
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var index = charset.indexOf(i);
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if (index != -1) {
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glyphs.push({
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unicode: index
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});
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} else {
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break;
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}
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}
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}
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if (!cmap) {
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// Font did not contain a cmap
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tables.push({
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tag: 'cmap',
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data: createCMapTable(glyphs)
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})
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} else {
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cmap.data = createCMapTable(glyphs);
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// Now create an identity mapping
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for (var i = 1; i < numGlyphs; i++) {
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glyphs.push({
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unicode: i
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});
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}
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} else {
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replaceCMapTable(cmap, font, properties);
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for (var i = 1; i < charset.length; i++) {
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var index = charset.indexOf(i);
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if (index != -1) {
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glyphs.push({
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unicode: index
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});
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} else {
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break;
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}
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}
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}
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// Rewrite the 'post' table if needed
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if (!post) {
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if (!cmap) {
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// Font did not contain a cmap
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tables.push({
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tag: 'post',
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data: stringToArray(createPostTable(properties))
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});
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tag: 'cmap',
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data: createCMapTable(glyphs)
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})
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} else {
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cmap.data = createCMapTable(glyphs);
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}
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// Rewrite the 'name' table if needed
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if (!nameTable) {
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tables.push({
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tag: 'name',
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data: stringToArray(createNameTable(this.name))
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});
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}
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// Tables needs to be written by ascendant alphabetic order
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tables.sort(function tables_sort(a, b) {
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return (a.tag > b.tag) - (a.tag < b.tag);
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});
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// rewrite the tables but tweak offsets
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for (var i = 0; i < tables.length; i++) {
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var table = tables[i];
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var data = [];
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var tableData = table.data;
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for (var j = 0; j < tableData.length; j++)
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data.push(tableData[j]);
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createTableEntry(ttf, offsets, table.tag, data);
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}
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// Add the table datas
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for (var i = 0; i < tables.length; i++) {
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var table = tables[i];
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var tableData = table.data;
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ttf.set(tableData, offsets.currentOffset);
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offsets.currentOffset += tableData.length;
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// 4-byte aligned data
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while (offsets.currentOffset & 3)
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offsets.currentOffset++;
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}
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var fontData = [];
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for (var i = 0; i < offsets.currentOffset; i++)
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fontData.push(ttf[i]);
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return fontData;
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} else if (requiredTables.length) {
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error('Table ' + requiredTables[0] +
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' is missing from the TrueType font');
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} else {
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replaceCMapTable(cmap, font, properties);
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}
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return font.getBytes();
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// Rewrite the 'post' table if needed
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if (requiredTables.indexOf('post') != -1) {
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tables.push({
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tag: 'post',
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data: stringToArray(createPostTable(properties))
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});
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}
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// Rewrite the 'name' table if needed
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if (requiredTables.indexOf('name') != -1) {
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tables.push({
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tag: 'name',
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data: stringToArray(createNameTable(this.name))
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});
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}
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// Tables needs to be written by ascendant alphabetic order
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tables.sort(function tables_sort(a, b) {
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return (a.tag > b.tag) - (a.tag < b.tag);
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});
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// rewrite the tables but tweak offsets
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for (var i = 0; i < tables.length; i++) {
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var table = tables[i];
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var data = [];
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var tableData = table.data;
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for (var j = 0; j < tableData.length; j++)
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data.push(tableData[j]);
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createTableEntry(ttf, offsets, table.tag, data);
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}
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// Add the table datas
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for (var i = 0; i < tables.length; i++) {
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var table = tables[i];
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var tableData = table.data;
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ttf.set(tableData, offsets.currentOffset);
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offsets.currentOffset += tableData.length;
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// 4-byte aligned data
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while (offsets.currentOffset & 3)
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offsets.currentOffset++;
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}
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var fontData = [];
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for (var i = 0; i < offsets.currentOffset; i++)
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fontData.push(ttf[i]);
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return fontData;
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},
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convert: function font_convert(fontName, font, properties) {
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@ -8,6 +8,7 @@
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<script type="text/javascript" src="viewer.js"></script>
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<script type="text/javascript" src="../pdf.js"></script>
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<script type="text/javascript" src="../fonts.js"></script>
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<script type="text/javascript" src="../utils/fonts_utils.js"></script>
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<script type="text/javascript" src="../crypto.js"></script>
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<script type="text/javascript" src="../glyphlist.js"></script>
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</head>
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