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251 lines
9.6 KiB
Plaintext
251 lines
9.6 KiB
Plaintext
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = void 0;
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var _table = _interopRequireDefault(require("./table"));
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var _struct = _interopRequireDefault(require("./struct"));
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* @file OS/2表
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* @author mengke01(kekee000@gmail.com)
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*
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* http://www.microsoft.com/typography/otspec/os2.htm
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*/
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var _default = exports.default = _table.default.create('OS/2', [['version', _struct.default.Uint16], ['xAvgCharWidth', _struct.default.Int16], ['usWeightClass', _struct.default.Uint16], ['usWidthClass', _struct.default.Uint16], ['fsType', _struct.default.Uint16], ['ySubscriptXSize', _struct.default.Uint16], ['ySubscriptYSize', _struct.default.Uint16], ['ySubscriptXOffset', _struct.default.Uint16], ['ySubscriptYOffset', _struct.default.Uint16], ['ySuperscriptXSize', _struct.default.Uint16], ['ySuperscriptYSize', _struct.default.Uint16], ['ySuperscriptXOffset', _struct.default.Uint16], ['ySuperscriptYOffset', _struct.default.Uint16], ['yStrikeoutSize', _struct.default.Uint16], ['yStrikeoutPosition', _struct.default.Uint16], ['sFamilyClass', _struct.default.Uint16],
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// Panose
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['bFamilyType', _struct.default.Uint8], ['bSerifStyle', _struct.default.Uint8], ['bWeight', _struct.default.Uint8], ['bProportion', _struct.default.Uint8], ['bContrast', _struct.default.Uint8], ['bStrokeVariation', _struct.default.Uint8], ['bArmStyle', _struct.default.Uint8], ['bLetterform', _struct.default.Uint8], ['bMidline', _struct.default.Uint8], ['bXHeight', _struct.default.Uint8],
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// unicode range
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['ulUnicodeRange1', _struct.default.Uint32], ['ulUnicodeRange2', _struct.default.Uint32], ['ulUnicodeRange3', _struct.default.Uint32], ['ulUnicodeRange4', _struct.default.Uint32],
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// char 4
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['achVendID', _struct.default.String, 4], ['fsSelection', _struct.default.Uint16], ['usFirstCharIndex', _struct.default.Uint16], ['usLastCharIndex', _struct.default.Uint16], ['sTypoAscender', _struct.default.Int16], ['sTypoDescender', _struct.default.Int16], ['sTypoLineGap', _struct.default.Int16], ['usWinAscent', _struct.default.Uint16], ['usWinDescent', _struct.default.Uint16],
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// version 0 above 39
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['ulCodePageRange1', _struct.default.Uint32], ['ulCodePageRange2', _struct.default.Uint32],
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// version 1 above 41
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['sxHeight', _struct.default.Int16], ['sCapHeight', _struct.default.Int16], ['usDefaultChar', _struct.default.Uint16], ['usBreakChar', _struct.default.Uint16], ['usMaxContext', _struct.default.Uint16]
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// version 2,3,4 above 46
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], {
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read: function read(reader, ttf) {
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var format = reader.readUint16(this.offset);
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var struct = this.struct;
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// format2
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if (format === 0) {
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struct = struct.slice(0, 39);
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} else if (format === 1) {
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struct = struct.slice(0, 41);
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}
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var OS2Head = _table.default.create('os2head', struct);
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var tbl = new OS2Head(this.offset).read(reader, ttf);
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// 补齐其他version的字段
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var os2Fields = {
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ulCodePageRange1: 1,
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ulCodePageRange2: 0,
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sxHeight: 0,
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sCapHeight: 0,
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usDefaultChar: 0,
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usBreakChar: 32,
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usMaxContext: 0
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};
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return Object.assign(os2Fields, tbl);
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},
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size: function size(ttf) {
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// 更新其他表的统计信息
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// header
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var xMin = 16384;
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var yMin = 16384;
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var xMax = -16384;
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var yMax = -16384;
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// hhea
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var advanceWidthMax = -1;
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var minLeftSideBearing = 16384;
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var minRightSideBearing = 16384;
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var xMaxExtent = -16384;
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// os2 count
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var xAvgCharWidth = 0;
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var usFirstCharIndex = 0x10FFFF;
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var usLastCharIndex = -1;
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// maxp
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var maxPoints = 0;
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var maxContours = 0;
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var maxCompositePoints = 0;
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var maxCompositeContours = 0;
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var maxSizeOfInstructions = 0;
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var maxComponentElements = 0;
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var glyfNotEmpty = 0; // 非空glyf
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var hinting = ttf.writeOptions ? ttf.writeOptions.hinting : false;
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// 计算instructions和functiondefs
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if (hinting) {
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if (ttf.cvt) {
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maxSizeOfInstructions = Math.max(maxSizeOfInstructions, ttf.cvt.length);
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}
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if (ttf.prep) {
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maxSizeOfInstructions = Math.max(maxSizeOfInstructions, ttf.prep.length);
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}
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if (ttf.fpgm) {
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maxSizeOfInstructions = Math.max(maxSizeOfInstructions, ttf.fpgm.length);
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}
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}
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ttf.glyf.forEach(function (glyf) {
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// 统计control point信息
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if (glyf.compound) {
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var compositeContours = 0;
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var compositePoints = 0;
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glyf.glyfs.forEach(function (g) {
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var cglyf = ttf.glyf[g.glyphIndex];
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if (!cglyf) {
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return;
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}
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compositeContours += cglyf.contours ? cglyf.contours.length : 0;
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if (cglyf.contours && cglyf.contours.length) {
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cglyf.contours.forEach(function (contour) {
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compositePoints += contour.length;
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});
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}
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});
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maxComponentElements = Math.max(maxComponentElements, glyf.glyfs.length);
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maxCompositePoints = Math.max(maxCompositePoints, compositePoints);
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maxCompositeContours = Math.max(maxCompositeContours, compositeContours);
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}
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// 简单图元
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else if (glyf.contours && glyf.contours.length) {
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maxContours = Math.max(maxContours, glyf.contours.length);
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var points = 0;
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glyf.contours.forEach(function (contour) {
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points += contour.length;
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});
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maxPoints = Math.max(maxPoints, points);
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}
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if (hinting && glyf.instructions) {
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maxSizeOfInstructions = Math.max(maxSizeOfInstructions, glyf.instructions.length);
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}
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// 统计边界信息
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if (null != glyf.xMin && glyf.xMin < xMin) {
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xMin = glyf.xMin;
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}
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if (null != glyf.yMin && glyf.yMin < yMin) {
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yMin = glyf.yMin;
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}
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if (null != glyf.xMax && glyf.xMax > xMax) {
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xMax = glyf.xMax;
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}
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if (null != glyf.yMax && glyf.yMax > yMax) {
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yMax = glyf.yMax;
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}
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advanceWidthMax = Math.max(advanceWidthMax, glyf.advanceWidth);
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minLeftSideBearing = Math.min(minLeftSideBearing, glyf.leftSideBearing);
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if (null != glyf.xMax) {
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minRightSideBearing = Math.min(minRightSideBearing, glyf.advanceWidth - glyf.xMax);
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xMaxExtent = Math.max(xMaxExtent, glyf.xMax);
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}
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if (null != glyf.advanceWidth) {
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xAvgCharWidth += glyf.advanceWidth;
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glyfNotEmpty++;
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}
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var unicodes = glyf.unicode;
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if (typeof glyf.unicode === 'number') {
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unicodes = [glyf.unicode];
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}
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if (Array.isArray(unicodes)) {
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unicodes.forEach(function (unicode) {
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if (unicode !== 0xFFFF) {
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usFirstCharIndex = Math.min(usFirstCharIndex, unicode);
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usLastCharIndex = Math.max(usLastCharIndex, unicode);
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}
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});
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}
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});
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// 重新设置version 4
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ttf['OS/2'].version = 0x4;
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ttf['OS/2'].achVendID = (ttf['OS/2'].achVendID + ' ').slice(0, 4);
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ttf['OS/2'].xAvgCharWidth = xAvgCharWidth / (glyfNotEmpty || 1);
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ttf['OS/2'].ulUnicodeRange2 = 268435456;
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ttf['OS/2'].usFirstCharIndex = usFirstCharIndex;
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ttf['OS/2'].usLastCharIndex = usLastCharIndex;
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// rewrite hhea
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ttf.hhea.version = ttf.hhea.version || 0x1;
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ttf.hhea.advanceWidthMax = advanceWidthMax;
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ttf.hhea.minLeftSideBearing = minLeftSideBearing;
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ttf.hhea.minRightSideBearing = minRightSideBearing;
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ttf.hhea.xMaxExtent = xMaxExtent;
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// rewrite head
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ttf.head.version = ttf.head.version || 0x1;
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ttf.head.lowestRecPPEM = ttf.head.lowestRecPPEM || 0x8;
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ttf.head.xMin = xMin;
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ttf.head.yMin = yMin;
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ttf.head.xMax = xMax;
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ttf.head.yMax = yMax;
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// head rewrite
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if (ttf.support.head) {
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var _ttf$support$head = ttf.support.head,
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_xMin = _ttf$support$head.xMin,
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_yMin = _ttf$support$head.yMin,
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_xMax = _ttf$support$head.xMax,
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_yMax = _ttf$support$head.yMax;
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if (_xMin != null) {
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ttf.head.xMin = _xMin;
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}
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if (_yMin != null) {
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ttf.head.yMin = _yMin;
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}
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if (_xMax != null) {
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ttf.head.xMax = _xMax;
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}
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if (_yMax != null) {
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ttf.head.yMax = _yMax;
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}
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}
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// hhea rewrite
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if (ttf.support.hhea) {
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var _ttf$support$hhea = ttf.support.hhea,
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_advanceWidthMax = _ttf$support$hhea.advanceWidthMax,
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_xMaxExtent = _ttf$support$hhea.xMaxExtent,
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_minLeftSideBearing = _ttf$support$hhea.minLeftSideBearing,
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_minRightSideBearing = _ttf$support$hhea.minRightSideBearing;
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if (_advanceWidthMax != null) {
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ttf.hhea.advanceWidthMax = _advanceWidthMax;
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}
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if (_xMaxExtent != null) {
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ttf.hhea.xMaxExtent = _xMaxExtent;
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}
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if (_minLeftSideBearing != null) {
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ttf.hhea.minLeftSideBearing = _minLeftSideBearing;
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}
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if (_minRightSideBearing != null) {
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ttf.hhea.minRightSideBearing = _minRightSideBearing;
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}
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}
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// 这里根据存储的maxp来设置新的maxp，避免重复计算maxp
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ttf.maxp = ttf.maxp || {};
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ttf.support.maxp = {
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version: 1.0,
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numGlyphs: ttf.glyf.length,
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maxPoints: maxPoints,
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maxContours: maxContours,
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maxCompositePoints: maxCompositePoints,
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maxCompositeContours: maxCompositeContours,
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maxZones: ttf.maxp.maxZones || 0,
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maxTwilightPoints: ttf.maxp.maxTwilightPoints || 0,
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maxStorage: ttf.maxp.maxStorage || 0,
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maxFunctionDefs: ttf.maxp.maxFunctionDefs || 0,
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maxStackElements: ttf.maxp.maxStackElements || 0,
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maxSizeOfInstructions: maxSizeOfInstructions,
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maxComponentElements: maxComponentElements,
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maxComponentDepth: maxComponentElements ? 1 : 0
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};
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return _table.default.size.call(this, ttf);
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}
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}); |