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Merge pull request #2505 from yurydelendik/refactor-cff-float
Refactors encodeFloat, font matrix and flex args
This commit is contained in:
Brendan Dahl
commit
bf0abd61d1
3 changed files with 95 additions and 114 deletions
142
src/fonts.js
142
src/fonts.js
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@ -29,6 +29,8 @@ var PDF_GLYPH_SPACE_UNITS = 1000;
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// Until hinting is fully supported this constant can be used
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var HINTING_ENABLED = false;
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var FONT_IDENTITY_MATRIX = [0.001, 0, 0, 0.001, 0, 0];
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var FontFlags = {
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FixedPitch: 1,
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Serif: 2,
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@ -2214,6 +2216,19 @@ function fontCharsToUnicode(charCodes, font) {
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return result;
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}
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function adjustWidths(properties) {
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if (properties.fontMatrix[0] === FONT_IDENTITY_MATRIX[0]) {
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return;
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}
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// adjusting width to fontMatrix scale
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var scale = 0.001 / properties.fontMatrix[0];
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var glyphsWidths = properties.widths;
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for (var glyph in glyphsWidths) {
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glyphsWidths[glyph] *= scale;
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}
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properties.defaultWidth *= scale;
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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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@ -2260,7 +2275,6 @@ var Font = (function FontClosure() {
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this.hasEncoding = properties.hasEncoding;
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this.fontMatrix = properties.fontMatrix;
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this.widthMultiplier = 1.0;
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if (properties.type == 'Type3') {
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this.encoding = properties.baseEncoding;
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return;
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@ -2318,6 +2332,8 @@ var Font = (function FontClosure() {
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var cff = (subtype == 'Type1C' || subtype == 'CIDFontType0C') ?
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new CFFFont(file, properties) : new Type1Font(name, file, properties);
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adjustWidths(properties);
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// Wrap the CFF data inside an OTF font file
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data = this.convert(name, cff, properties);
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break;
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@ -2337,10 +2353,13 @@ var Font = (function FontClosure() {
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}
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this.data = data;
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// Transfer some properties again that could change during font conversion
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this.fontMatrix = properties.fontMatrix;
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this.widthMultiplier = !properties.fontMatrix ? 1.0 :
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1.0 / properties.fontMatrix[0];
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this.widths = properties.widths;
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this.defaultWidth = properties.defaultWidth;
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this.encoding = properties.baseEncoding;
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this.loading = true;
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};
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@ -3931,7 +3950,7 @@ var Font = (function FontClosure() {
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}
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this.toFontChar = toFontChar;
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}
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var unitsPerEm = properties.unitsPerEm || 1000; // defaulting to 1000
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var unitsPerEm = 1 / (properties.fontMatrix || FONT_IDENTITY_MATRIX)[0];
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var fields = {
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// PostScript Font Program
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@ -4170,7 +4189,7 @@ var Font = (function FontClosure() {
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if (width)
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break; // the non-zero width found
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}
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width = (width || this.defaultWidth) * this.widthMultiplier;
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width = width || this.defaultWidth;
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// Do not shadow the property here. See discussion:
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// https://github.com/mozilla/pdf.js/pull/2127#discussion_r1662280
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this._shadowWidth = width;
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@ -4251,7 +4270,7 @@ var Font = (function FontClosure() {
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if (typeof unicodeChars === 'number')
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unicodeChars = String.fromCharCode(unicodeChars);
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width = (isNum(width) ? width : this.defaultWidth) * this.widthMultiplier;
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width = isNum(width) ? width : this.defaultWidth;
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disabled = this.unicodeIsEnabled ?
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!this.unicodeIsEnabled[fontCharCode] : false;
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@ -4443,6 +4462,7 @@ var Type1Parser = function type1Parser() {
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// Type1 only command with command not (yet) built-in ,throw an error
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'7': -1, // sbw
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'10': 'add',
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'11': 'sub',
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'12': 'div',
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@ -4507,16 +4527,6 @@ var Type1Parser = function type1Parser() {
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return args;
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}
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// Remove the same number of args from the stack that are in the args
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// parameter. Args should be built from breakUpArgs().
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function popArgs(stack, args) {
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for (var i = 0, ii = args.length; i < ii; i++) {
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for (var j = 0, jj = args[i].arg.length; j < jj; j++) {
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stack.pop();
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}
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}
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}
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function decodeCharString(array) {
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var charstring = [];
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var lsb = 0;
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@ -4617,25 +4627,32 @@ var Type1Parser = function type1Parser() {
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break;
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case 0:
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var flexArgs = breakUpArgs(charstring, 17);
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popArgs(charstring, flexArgs);
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charstring.push(
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flexArgs[2].value + flexArgs[0].value, // bcp1x + rpx
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flexArgs[3].value + flexArgs[1].value, // bcp1y + rpy
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flexArgs[4].value, // bcp2x
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flexArgs[5].value, // bcp2y
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flexArgs[6].value, // p2x
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flexArgs[7].value, // p2y
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flexArgs[8].value, // bcp3x
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flexArgs[9].value, // bcp3y
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flexArgs[10].value, // bcp4x
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flexArgs[11].value, // bcp4y
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flexArgs[12].value, // p3x
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flexArgs[13].value, // p3y
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flexArgs[14].value, // flexDepth
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// removing all flex arguments from the stack
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charstring.splice(flexArgs[0].offset,
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charstring.length - flexArgs[0].offset);
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charstring = charstring.concat(
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flexArgs[0].arg, // bcp1x +
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flexArgs[2].arg, // rpx
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['add'],
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flexArgs[1].arg, // bcp1y +
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flexArgs[3].arg, // rpy
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['add'],
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flexArgs[4].arg, // bcp2x
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flexArgs[5].arg, // bcp2y
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flexArgs[6].arg, // p2x
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flexArgs[7].arg, // p2y
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flexArgs[8].arg, // bcp3x
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flexArgs[9].arg, // bcp3y
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flexArgs[10].arg, // bcp4x
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flexArgs[11].arg, // bcp4y
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flexArgs[12].arg, // p3x
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flexArgs[13].arg, // p3y
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flexArgs[14].arg, // flexDepth
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// 15 = finalx unused by flex
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// 16 = finaly unused by flex
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'flex'
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['flex']
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);
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flexing = false;
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@ -4650,14 +4667,9 @@ var Type1Parser = function type1Parser() {
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charstring.push(0);
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continue; // ignoring hmoveto
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} else if (value == 4 && flexing) { // vmoveto
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// Add the dx for flex and but also swap the values so they are the
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// right order.
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var vArgs = breakUpArgs(charstring, 1);
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popArgs(charstring, vArgs);
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charstring.push(0);
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for (var t = 0, tt = vArgs[0].arg.length; t < tt; t++) {
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charstring.push(vArgs[0].arg[t]);
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}
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// Insert the dx for flex before dy.
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var flexArgs = breakUpArgs(charstring, 1);
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charstring.splice(flexArgs[0].offset, 0, 0);
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continue; // ignoring vmoveto
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} else if (!HINTING_ENABLED && (value == 1 || value == 3)) {
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charstring.push('drop', 'drop');
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@ -4909,14 +4921,6 @@ var Type1Parser = function type1Parser() {
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switch (token) {
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case '/FontMatrix':
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var matrix = readNumberArray(headerString, i + 1);
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// The FontMatrix is in unitPerEm, so make it pixels
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for (var j = 0, jj = matrix.length; j < jj; j++)
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matrix[j] *= 1000;
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// Make the angle into the right direction
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matrix[2] *= -1;
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properties.fontMatrix = matrix;
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break;
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case '/Encoding':
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@ -5124,6 +5128,7 @@ Type1Font.prototype = {
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'rrcurveto': 8,
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'callsubr': 10,
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'return': 11,
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'add': [12, 10],
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'sub': [12, 11],
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'div': [12, 12],
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'exch': [12, 28],
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@ -5191,6 +5196,7 @@ Type1Font.prototype = {
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topDict.setByName('FamilyName', 3);
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topDict.setByName('Weight', 4);
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topDict.setByName('Encoding', null); // placeholder
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topDict.setByName('FontMatrix', properties.fontMatrix);
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topDict.setByName('FontBBox', properties.bbox);
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topDict.setByName('charset', null); // placeholder
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topDict.setByName('CharStrings', null); // placeholder
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@ -5465,8 +5471,7 @@ var CFFParser = (function CFFParserClosure() {
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var fontMatrix = topDict.getByName('FontMatrix');
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if (fontMatrix) {
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// estimating unitsPerEM for the font
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properties.unitsPerEm = 1 / fontMatrix[0];
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properties.fontMatrix = fontMatrix;
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}
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var fontBBox = topDict.getByName('FontBBox');
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@ -6391,37 +6396,26 @@ var CFFCompiler = (function CFFCompilerClosure() {
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else
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return this.encodeFloat(value);
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},
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encodeFloat: function CFFCompiler_encodeFloat(value) {
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value = value.toString();
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// Strip off the any leading zeros.
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if (value.substr(0, 2) === '0.')
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value = value.substr(1);
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else if (value.substr(0, 3) === '-0.')
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value = '-' + value.substr(2);
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var nibbles = [];
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encodeFloat: function CFFCompiler_encodeFloat(num) {
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var value = num.toString();
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var nibbles = '';
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for (var i = 0, ii = value.length; i < ii; ++i) {
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var a = value.charAt(i), b = value.charAt(i + 1);
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var nibble;
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if (a === 'e' && b === '-') {
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nibble = 0xc;
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++i;
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var a = value[i];
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if (a === 'e') {
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nibbles += value[++i] === '-' ? 'c' : 'b';
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} else if (a === '.') {
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nibble = 0xa;
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} else if (a === 'E') {
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nibble = 0xb;
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nibbles += 'a';
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} else if (a === '-') {
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nibble = 0xe;
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nibbles += 'e';
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} else {
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nibble = a;
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nibbles += a;
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}
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nibbles.push(nibble);
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}
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nibbles.push(0xf);
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if (nibbles.length % 2)
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nibbles.push(0xf);
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nibbles += (nibbles.length & 1) ? 'f' : 'ff';
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var out = [30];
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for (var i = 0, ii = nibbles.length; i < ii; i += 2)
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out.push(nibbles[i] << 4 | nibbles[i + 1]);
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for (var i = 0, ii = nibbles.length; i < ii; i += 2) {
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out.push(parseInt(nibbles.substr(i, 2), 16));
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}
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return out;
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},
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encodeInteger: function CFFCompiler_encodeInteger(value) {
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