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https://github.com/mozilla/pdf.js.git
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Use TypedArrays in the createCmapTable function
This commit is contained in:
Jonas Jenwald
parent
f9ecebe63c
commit
cb935c35d3
@ -20,7 +20,6 @@ import {
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FormatError,
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info,
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shadow,
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string32,
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stringToBytes,
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warn,
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} from "../shared/util.js";
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@ -689,12 +688,13 @@ function getRanges(glyphs, toUnicodeExtraMap, numGlyphs) {
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function createCmapTable(glyphs, toUnicodeExtraMap, numGlyphs) {
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const ranges = getRanges(glyphs, toUnicodeExtraMap, numGlyphs);
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const numTables = ranges.at(-1)[1] > 0xffff ? 2 : 1;
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let cmap =
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"\x00\x00" + // version
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string16(numTables) + // numTables
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"\x00\x03" + // platformID
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"\x00\x01" + // encodingID
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string32(4 + numTables * 8); // start of the table record
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const cmap = new TrueTypeTableBuilder({ exactLength: 12 });
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cmap.skip(2); // version, skip redundant "\x00\x00"
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cmap.setInt16(numTables); // numTables
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cmap.setArray([0x00, 0x03]); // platformID
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cmap.setArray([0x00, 0x01]); // encodingID
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cmap.setInt32(4 + numTables * 8); // start of the table record
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let i, ii, j, jj;
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for (i = ranges.length - 1; i >= 0; --i) {
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@ -712,11 +712,11 @@ function createCmapTable(glyphs, toUnicodeExtraMap, numGlyphs) {
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const searchParams = OpenTypeFileBuilder.getSearchParams(segCount, 2);
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// Fill up the 4 parallel arrays describing the segments.
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let startCount = "";
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let endCount = "";
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let idDeltas = "";
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let idRangeOffsets = "";
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let glyphsIds = "";
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const startCount = new TrueTypeTableBuilder({}),
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endCount = new TrueTypeTableBuilder({}),
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idDeltas = new TrueTypeTableBuilder({}),
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idRangeOffsets = new TrueTypeTableBuilder({}),
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glyphsIds = new TrueTypeTableBuilder({});
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let bias = 0;
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let range, start, end, codes;
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@ -724,8 +724,8 @@ function createCmapTable(glyphs, toUnicodeExtraMap, numGlyphs) {
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range = ranges[i];
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start = range[0];
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end = range[1];
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startCount += string16(start);
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endCount += string16(end);
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startCount.setInt16(start);
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endCount.setInt16(end);
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codes = range[2];
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let contiguous = true;
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for (j = 1, jj = codes.length; j < jj; ++j) {
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@ -738,48 +738,58 @@ function createCmapTable(glyphs, toUnicodeExtraMap, numGlyphs) {
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const offset = (segCount - i) * 2 + bias * 2;
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bias += end - start + 1;
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idDeltas += string16(0);
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idRangeOffsets += string16(offset);
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idDeltas.skip(2); // Skip redundant "\x00\x00"
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idRangeOffsets.setInt16(offset);
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for (j = 0, jj = codes.length; j < jj; ++j) {
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glyphsIds += string16(codes[j]);
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glyphsIds.setInt16(codes[j]);
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}
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} else {
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const startCode = codes[0];
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idDeltas += string16((startCode - start) & 0xffff);
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idRangeOffsets += string16(0);
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idDeltas.setInt16((startCode - start) & 0xffff);
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idRangeOffsets.skip(2); // Skip redundant "\x00\x00"
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}
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}
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if (trailingRangesCount > 0) {
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endCount += "\xFF\xFF";
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startCount += "\xFF\xFF";
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idDeltas += "\x00\x01";
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idRangeOffsets += "\x00\x00";
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endCount.setArray([0xff, 0xff]);
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startCount.setArray([0xff, 0xff]);
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idDeltas.setArray([0x00, 0x01]);
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idRangeOffsets.skip(2); // Skip redundant "\x00\x00"
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}
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const format314 =
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"\x00\x00" + // language
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string16(2 * segCount) +
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string16(searchParams.range) +
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string16(searchParams.entry) +
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string16(searchParams.rangeShift) +
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endCount +
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"\x00\x00" +
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startCount +
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idDeltas +
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idRangeOffsets +
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glyphsIds;
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const format314 = new TrueTypeTableBuilder({
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exactLength:
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12 +
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startCount.length +
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endCount.length +
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idDeltas.length +
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idRangeOffsets.length +
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glyphsIds.length,
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});
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format314.skip(2); // language, skip redundant "\x00\x00"
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format314.setInt16(2 * segCount);
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format314.setInt16(searchParams.range);
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format314.setInt16(searchParams.entry);
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format314.setInt16(searchParams.rangeShift);
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format314.setArray(endCount.data);
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format314.skip(2); // Skip redundant "\x00\x00"
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format314.setArray(startCount.data);
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format314.setArray(idDeltas.data);
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format314.setArray(idRangeOffsets.data);
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format314.setArray(glyphsIds.data);
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let format31012 = "";
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let header31012 = "";
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let cmap31012 = null,
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format31012 = null,
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header31012 = null;
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if (numTables > 1) {
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cmap +=
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"\x00\x03" + // platformID
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"\x00\x0A" + // encodingID
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string32(4 + numTables * 8 + 4 + format314.length); // start of the table record
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format31012 = "";
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cmap31012 = new TrueTypeTableBuilder({ exactLength: 8 });
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cmap31012.setArray([0x00, 0x03]); // platformID
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cmap31012.setArray([0x00, 0x0a]); // encodingID
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cmap31012.setInt32(4 + numTables * 8 + 4 + format314.length); // start of the table record
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format31012 = new TrueTypeTableBuilder({});
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for (i = 0, ii = ranges.length; i < ii; i++) {
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range = ranges[i];
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start = range[0];
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@ -788,35 +798,43 @@ function createCmapTable(glyphs, toUnicodeExtraMap, numGlyphs) {
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for (j = 1, jj = codes.length; j < jj; ++j) {
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if (codes[j] !== codes[j - 1] + 1) {
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end = range[0] + j - 1;
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format31012 +=
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string32(start) + // startCharCode
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string32(end) + // endCharCode
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string32(code); // startGlyphID
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format31012.setInt32(start); // startCharCode
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format31012.setInt32(end); // endCharCode
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format31012.setInt32(code); // startGlyphID
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start = end + 1;
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code = codes[j];
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}
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}
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format31012 +=
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string32(start) + // startCharCode
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string32(range[1]) + // endCharCode
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string32(code); // startGlyphID
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format31012.setInt32(start); // startCharCode
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format31012.setInt32(range[1]); // endCharCode
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format31012.setInt32(code); // startGlyphID
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}
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header31012 =
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"\x00\x0C" + // format
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"\x00\x00" + // reserved
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string32(format31012.length + 16) + // length
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"\x00\x00\x00\x00" + // language
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string32(format31012.length / 12); // nGroups
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header31012 = new TrueTypeTableBuilder({ exactLength: 16 });
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header31012.setArray([0x00, 0x0c]); // format
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header31012.skip(2); // reserved, skip redundant "\x00\x00"
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header31012.setInt32(format31012.length + 16); // length
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header31012.skip(4); // language, skip redundant "\x00\x00\x00\x00"
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header31012.setInt32(format31012.length / 12); // nGroups
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}
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return stringToBytes(
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cmap +
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"\x00\x04" + // format
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string16(format314.length + 4) + // length
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format314 +
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header31012 +
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format31012
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);
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const table = new TrueTypeTableBuilder({
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exactLength:
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4 +
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cmap.length +
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(cmap31012?.length ?? 0) +
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format314.length +
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(header31012?.length ?? 0) +
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(format31012?.length ?? 0),
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});
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table.setArray(cmap.data);
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table.setArray(cmap31012?.data ?? []);
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table.setArray([0x00, 0x04]); // format
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table.setInt16(format314.length + 4); // length
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table.setArray(format314.data);
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table.setArray(header31012?.data ?? []);
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table.setArray(format31012?.data ?? []);
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return table.data;
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}
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function validateOS2Table(os2, file) {
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