Move the OpenTypeFileBuilder from src/core/fonts.js and into its own file
This commit is contained in:
Jonas Jenwald
parent
f0817015bd
commit
a783c7ca79
@ -66,6 +66,7 @@ import {
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} from "./core_utils.js";
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import { FontRendererFactory } from "./font_renderer.js";
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import { IdentityCMap } from "./cmap.js";
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import { OpenTypeFileBuilder } from "./opentype_file_builder.js";
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import { Stream } from "./stream.js";
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import { Type1Parser } from "./type1_parser.js";
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@ -408,150 +409,6 @@ var IdentityToUnicodeMap = (function IdentityToUnicodeMapClosure() {
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return IdentityToUnicodeMap;
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})();
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var OpenTypeFileBuilder = (function OpenTypeFileBuilderClosure() {
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function writeInt16(dest, offset, num) {
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dest[offset] = (num >> 8) & 0xff;
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dest[offset + 1] = num & 0xff;
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}
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function writeInt32(dest, offset, num) {
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dest[offset] = (num >> 24) & 0xff;
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dest[offset + 1] = (num >> 16) & 0xff;
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dest[offset + 2] = (num >> 8) & 0xff;
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dest[offset + 3] = num & 0xff;
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}
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function writeData(dest, offset, data) {
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var i, ii;
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if (data instanceof Uint8Array) {
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dest.set(data, offset);
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} else if (typeof data === "string") {
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for (i = 0, ii = data.length; i < ii; i++) {
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dest[offset++] = data.charCodeAt(i) & 0xff;
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}
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} else {
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// treating everything else as array
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for (i = 0, ii = data.length; i < ii; i++) {
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dest[offset++] = data[i] & 0xff;
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}
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}
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}
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// eslint-disable-next-line no-shadow
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function OpenTypeFileBuilder(sfnt) {
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this.sfnt = sfnt;
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this.tables = Object.create(null);
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}
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OpenTypeFileBuilder.getSearchParams = function OpenTypeFileBuilder_getSearchParams(
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entriesCount,
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entrySize
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) {
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var maxPower2 = 1,
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log2 = 0;
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while ((maxPower2 ^ entriesCount) > maxPower2) {
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maxPower2 <<= 1;
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log2++;
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}
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var searchRange = maxPower2 * entrySize;
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return {
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range: searchRange,
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entry: log2,
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rangeShift: entrySize * entriesCount - searchRange,
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};
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};
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var OTF_HEADER_SIZE = 12;
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var OTF_TABLE_ENTRY_SIZE = 16;
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OpenTypeFileBuilder.prototype = {
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toArray: function OpenTypeFileBuilder_toArray() {
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var sfnt = this.sfnt;
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// Tables needs to be written by ascendant alphabetic order
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var tables = this.tables;
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var tablesNames = Object.keys(tables);
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tablesNames.sort();
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var numTables = tablesNames.length;
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var i, j, jj, table, tableName;
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// layout the tables data
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var offset = OTF_HEADER_SIZE + numTables * OTF_TABLE_ENTRY_SIZE;
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var tableOffsets = [offset];
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for (i = 0; i < numTables; i++) {
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table = tables[tablesNames[i]];
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var paddedLength = ((table.length + 3) & ~3) >>> 0;
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offset += paddedLength;
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tableOffsets.push(offset);
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}
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var file = new Uint8Array(offset);
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// write the table data first (mostly for checksum)
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for (i = 0; i < numTables; i++) {
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table = tables[tablesNames[i]];
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writeData(file, tableOffsets[i], table);
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}
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// sfnt version (4 bytes)
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if (sfnt === "true") {
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// Windows hates the Mac TrueType sfnt version number
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sfnt = string32(0x00010000);
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}
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file[0] = sfnt.charCodeAt(0) & 0xff;
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file[1] = sfnt.charCodeAt(1) & 0xff;
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file[2] = sfnt.charCodeAt(2) & 0xff;
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file[3] = sfnt.charCodeAt(3) & 0xff;
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// numTables (2 bytes)
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writeInt16(file, 4, numTables);
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var searchParams = OpenTypeFileBuilder.getSearchParams(numTables, 16);
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// searchRange (2 bytes)
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writeInt16(file, 6, searchParams.range);
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// entrySelector (2 bytes)
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writeInt16(file, 8, searchParams.entry);
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// rangeShift (2 bytes)
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writeInt16(file, 10, searchParams.rangeShift);
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offset = OTF_HEADER_SIZE;
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// writing table entries
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for (i = 0; i < numTables; i++) {
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tableName = tablesNames[i];
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file[offset] = tableName.charCodeAt(0) & 0xff;
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file[offset + 1] = tableName.charCodeAt(1) & 0xff;
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file[offset + 2] = tableName.charCodeAt(2) & 0xff;
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file[offset + 3] = tableName.charCodeAt(3) & 0xff;
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// checksum
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var checksum = 0;
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for (j = tableOffsets[i], jj = tableOffsets[i + 1]; j < jj; j += 4) {
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var quad = readUint32(file, j);
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checksum = (checksum + quad) >>> 0;
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}
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writeInt32(file, offset + 4, checksum);
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// offset
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writeInt32(file, offset + 8, tableOffsets[i]);
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// length
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writeInt32(file, offset + 12, tables[tableName].length);
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offset += OTF_TABLE_ENTRY_SIZE;
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}
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return file;
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},
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addTable: function OpenTypeFileBuilder_addTable(tag, data) {
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if (tag in this.tables) {
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throw new Error("Table " + tag + " already exists");
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}
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this.tables[tag] = data;
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},
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};
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return OpenTypeFileBuilder;
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})();
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/**
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* 'Font' is the class the outside world should use, it encapsulate all the font
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* decoding logics whatever type it is (assuming the font type is supported).
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164
src/core/opentype_file_builder.js
Normal file
164
src/core/opentype_file_builder.js
Normal file
@ -0,0 +1,164 @@
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/* Copyright 2012 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* eslint-disable no-var */
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import { readUint32 } from "./core_utils.js";
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import { string32 } from "../shared/util.js";
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var OpenTypeFileBuilder = (function OpenTypeFileBuilderClosure() {
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function writeInt16(dest, offset, num) {
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dest[offset] = (num >> 8) & 0xff;
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dest[offset + 1] = num & 0xff;
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}
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function writeInt32(dest, offset, num) {
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dest[offset] = (num >> 24) & 0xff;
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dest[offset + 1] = (num >> 16) & 0xff;
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dest[offset + 2] = (num >> 8) & 0xff;
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dest[offset + 3] = num & 0xff;
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}
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function writeData(dest, offset, data) {
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var i, ii;
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if (data instanceof Uint8Array) {
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dest.set(data, offset);
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} else if (typeof data === "string") {
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for (i = 0, ii = data.length; i < ii; i++) {
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dest[offset++] = data.charCodeAt(i) & 0xff;
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}
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} else {
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// treating everything else as array
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for (i = 0, ii = data.length; i < ii; i++) {
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dest[offset++] = data[i] & 0xff;
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}
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}
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}
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// eslint-disable-next-line no-shadow
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function OpenTypeFileBuilder(sfnt) {
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this.sfnt = sfnt;
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this.tables = Object.create(null);
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}
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OpenTypeFileBuilder.getSearchParams = function OpenTypeFileBuilder_getSearchParams(
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entriesCount,
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entrySize
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) {
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var maxPower2 = 1,
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log2 = 0;
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while ((maxPower2 ^ entriesCount) > maxPower2) {
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maxPower2 <<= 1;
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log2++;
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}
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var searchRange = maxPower2 * entrySize;
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return {
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range: searchRange,
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entry: log2,
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rangeShift: entrySize * entriesCount - searchRange,
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};
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};
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var OTF_HEADER_SIZE = 12;
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var OTF_TABLE_ENTRY_SIZE = 16;
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OpenTypeFileBuilder.prototype = {
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toArray: function OpenTypeFileBuilder_toArray() {
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var sfnt = this.sfnt;
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// Tables needs to be written by ascendant alphabetic order
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var tables = this.tables;
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var tablesNames = Object.keys(tables);
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tablesNames.sort();
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var numTables = tablesNames.length;
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var i, j, jj, table, tableName;
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// layout the tables data
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var offset = OTF_HEADER_SIZE + numTables * OTF_TABLE_ENTRY_SIZE;
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var tableOffsets = [offset];
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for (i = 0; i < numTables; i++) {
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table = tables[tablesNames[i]];
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var paddedLength = ((table.length + 3) & ~3) >>> 0;
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offset += paddedLength;
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tableOffsets.push(offset);
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}
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var file = new Uint8Array(offset);
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// write the table data first (mostly for checksum)
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for (i = 0; i < numTables; i++) {
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table = tables[tablesNames[i]];
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writeData(file, tableOffsets[i], table);
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}
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// sfnt version (4 bytes)
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if (sfnt === "true") {
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// Windows hates the Mac TrueType sfnt version number
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sfnt = string32(0x00010000);
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}
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file[0] = sfnt.charCodeAt(0) & 0xff;
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file[1] = sfnt.charCodeAt(1) & 0xff;
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file[2] = sfnt.charCodeAt(2) & 0xff;
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file[3] = sfnt.charCodeAt(3) & 0xff;
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// numTables (2 bytes)
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writeInt16(file, 4, numTables);
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var searchParams = OpenTypeFileBuilder.getSearchParams(numTables, 16);
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// searchRange (2 bytes)
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writeInt16(file, 6, searchParams.range);
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// entrySelector (2 bytes)
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writeInt16(file, 8, searchParams.entry);
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// rangeShift (2 bytes)
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writeInt16(file, 10, searchParams.rangeShift);
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offset = OTF_HEADER_SIZE;
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// writing table entries
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for (i = 0; i < numTables; i++) {
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tableName = tablesNames[i];
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file[offset] = tableName.charCodeAt(0) & 0xff;
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file[offset + 1] = tableName.charCodeAt(1) & 0xff;
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file[offset + 2] = tableName.charCodeAt(2) & 0xff;
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file[offset + 3] = tableName.charCodeAt(3) & 0xff;
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// checksum
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var checksum = 0;
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for (j = tableOffsets[i], jj = tableOffsets[i + 1]; j < jj; j += 4) {
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var quad = readUint32(file, j);
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checksum = (checksum + quad) >>> 0;
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}
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writeInt32(file, offset + 4, checksum);
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// offset
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writeInt32(file, offset + 8, tableOffsets[i]);
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// length
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writeInt32(file, offset + 12, tables[tableName].length);
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offset += OTF_TABLE_ENTRY_SIZE;
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}
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return file;
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},
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addTable: function OpenTypeFileBuilder_addTable(tag, data) {
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if (tag in this.tables) {
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throw new Error("Table " + tag + " already exists");
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}
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this.tables[tag] = data;
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},
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};
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return OpenTypeFileBuilder;
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})();
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export { OpenTypeFileBuilder };
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