Refactor translateFont() to be more readable
This commit is contained in:
Vivien Nicolas
parent
12ef21cbbe
commit
8c21f53c98
4
fonts.js
4
fonts.js
@ -510,7 +510,7 @@ var Font = (function Font() {
|
||||
this.type = properties.type;
|
||||
this.textMatrix = properties.textMatrix;
|
||||
this.loadedName = getUniqueName();
|
||||
this.compositeFont = properties.compositeFont;
|
||||
this.composite = properties.composite;
|
||||
this.loading = true;
|
||||
};
|
||||
|
||||
@ -1352,7 +1352,7 @@ var Font = (function Font() {
|
||||
return chars;
|
||||
str = '';
|
||||
|
||||
if (this.compositeFont) {
|
||||
if (this.composite) {
|
||||
// composite fonts have multi-byte strings convert the string from
|
||||
// single-byte to multi-byte
|
||||
// XXX assuming CIDFonts are two-byte - later need to extract the
|
||||
|
||||
445
pdf.js
445
pdf.js
@ -3339,7 +3339,7 @@ var Page = (function() {
|
||||
});
|
||||
|
||||
for (var i = 0, ii = fonts.length; i < ii; ++i)
|
||||
fonts[i].fontDict.fontObj = fontObjs[i];
|
||||
fonts[i].dict.fontObj = fontObjs[i];
|
||||
},
|
||||
|
||||
|
||||
@ -4180,59 +4180,30 @@ var PartialEvaluator = (function() {
|
||||
};
|
||||
},
|
||||
|
||||
translateFont: function(fontDict, xref, resources) {
|
||||
var fd;
|
||||
var descendant = [];
|
||||
var subType = fontDict.get('Subtype');
|
||||
var compositeFont = false;
|
||||
assertWellFormed(IsName(subType), 'invalid font Subtype');
|
||||
|
||||
// If font is a composite
|
||||
// - get the descendant font
|
||||
// - set the type according to the descendant font
|
||||
// - get the FontDescriptor from the descendant font
|
||||
if (subType.name == 'Type0') {
|
||||
var df = fontDict.get('DescendantFonts');
|
||||
if (!df)
|
||||
return null;
|
||||
compositeFont = true;
|
||||
|
||||
if (IsRef(df)) {
|
||||
df = xref.fetch(df);
|
||||
}
|
||||
|
||||
descendant = xref.fetch(IsRef(df) ? df : df[0]);
|
||||
subType = descendant.get('Subtype');
|
||||
fd = descendant.get('FontDescriptor');
|
||||
} else {
|
||||
fd = fontDict.get('FontDescriptor');
|
||||
}
|
||||
|
||||
var builtInEncoding = false;
|
||||
var encodingMap = {};
|
||||
if (compositeFont) {
|
||||
// Special CIDFont support
|
||||
extractEncoding: function(dict, xref, properties) {
|
||||
var type = properties.type;
|
||||
if (properties.composite) {
|
||||
// XXX only CIDFontType2 supported for now
|
||||
if (subType.name == 'CIDFontType2') {
|
||||
var cidToGidMap = descendant.get('CIDToGIDMap');
|
||||
if (cidToGidMap && IsRef(cidToGidMap)) {
|
||||
// Extract the encoding from the CIDToGIDMap
|
||||
var glyphsStream = xref.fetchIfRef(cidToGidMap);
|
||||
var glyphsData = glyphsStream.getBytes(0);
|
||||
// Glyph ids are big-endian 2-byte values
|
||||
// Set this to 0 to verify the font has an encoding.
|
||||
encodingMap[0] = 0;
|
||||
for (var j = 0; j < glyphsData.length; j++) {
|
||||
var glyphID = (glyphsData[j++] << 8) | glyphsData[j];
|
||||
if (glyphID != 0)
|
||||
encodingMap[j >> 1] = glyphID;
|
||||
}
|
||||
if (type == 'CIDFontType2') {
|
||||
var cidToGidMap = dict.get('CIDToGIDMap');
|
||||
if (!cidToGidMap || !IsRef(cidToGidMap))
|
||||
return GlyphsUnicode;
|
||||
|
||||
// Extract the encoding from the CIDToGIDMap
|
||||
var glyphsStream = xref.fetchIfRef(cidToGidMap);
|
||||
var glyphsData = glyphsStream.getBytes(0);
|
||||
|
||||
// Glyph ids are big-endian 2-byte values
|
||||
// Set this to 0 to verify the font has an encoding.
|
||||
var encoding = properties.encoding;
|
||||
encoding[0] = 0;
|
||||
for (var j = 0; j < glyphsData.length; j++) {
|
||||
var glyphID = (glyphsData[j++] << 8) | glyphsData[j];
|
||||
if (glyphID != 0)
|
||||
encoding[j >> 1] = glyphID;
|
||||
}
|
||||
}
|
||||
else {
|
||||
// XXX This is a placeholder for handling of the encoding of
|
||||
// CIDFontType0 fonts
|
||||
var encoding = xref.fetchIfRef(fontDict.get('Encoding'));
|
||||
} else if (type == 'CIDFontType0') {
|
||||
var encoding = xref.fetchIfRef(dict.get('Encoding'));
|
||||
if (IsName(encoding)) {
|
||||
// Encoding is a predefined CMap
|
||||
if (encoding.name == 'Identity-H') {
|
||||
@ -4246,227 +4217,254 @@ var PartialEvaluator = (function() {
|
||||
'9.7.5.3');
|
||||
}
|
||||
}
|
||||
} else {
|
||||
var baseEncoding = null, diffEncoding = [];
|
||||
if (fontDict.has('Encoding')) {
|
||||
var encoding = xref.fetchIfRef(fontDict.get('Encoding'));
|
||||
if (IsDict(encoding)) {
|
||||
var baseName = encoding.get('BaseEncoding');
|
||||
if (baseName)
|
||||
baseEncoding = Encodings[baseName.name].slice();
|
||||
return GlyphsUnicode;
|
||||
}
|
||||
|
||||
// Load the differences between the base and original
|
||||
var differences = encoding.get('Differences');
|
||||
var index = 0;
|
||||
for (var j = 0; j < differences.length; j++) {
|
||||
var data = differences[j];
|
||||
if (IsNum(data))
|
||||
index = data;
|
||||
else
|
||||
diffEncoding[index++] = data.name;
|
||||
}
|
||||
} else if (IsName(encoding)) {
|
||||
baseEncoding = Encodings[encoding.name].slice();
|
||||
} else {
|
||||
error('Encoding is not a Name nor a Dict');
|
||||
var differences = properties.differences;
|
||||
var map = properties.encoding;
|
||||
var baseEncoding = null;
|
||||
if (dict.has('Encoding')) {
|
||||
var encoding = xref.fetchIfRef(dict.get('Encoding'));
|
||||
if (IsDict(encoding)) {
|
||||
var baseName = encoding.get('BaseEncoding');
|
||||
if (baseName)
|
||||
baseEncoding = Encodings[baseName.name].slice();
|
||||
|
||||
// Load the differences between the base and original
|
||||
var diffEncoding = encoding.get('Differences');
|
||||
var index = 0;
|
||||
for (var j = 0; j < diffEncoding.length; j++) {
|
||||
var data = diffEncoding[j];
|
||||
if (IsNum(data))
|
||||
index = data;
|
||||
else
|
||||
differences[index++] = data.name;
|
||||
}
|
||||
} else if (IsName(encoding)) {
|
||||
baseEncoding = Encodings[encoding.name].slice();
|
||||
} else {
|
||||
error('Encoding is not a Name nor a Dict');
|
||||
}
|
||||
}
|
||||
|
||||
var fontType = subType.name;
|
||||
if (!baseEncoding) {
|
||||
switch (fontType) {
|
||||
case 'TrueType':
|
||||
baseEncoding = Encodings.WinAnsiEncoding.slice();
|
||||
break;
|
||||
case 'Type1':
|
||||
baseEncoding = Encodings.StandardEncoding.slice();
|
||||
break;
|
||||
default:
|
||||
warn('Unknown type of font: ' + fontType);
|
||||
break;
|
||||
}
|
||||
if (!baseEncoding) {
|
||||
switch (type) {
|
||||
case 'TrueType':
|
||||
baseEncoding = Encodings.WinAnsiEncoding.slice();
|
||||
break;
|
||||
case 'Type1':
|
||||
baseEncoding = Encodings.StandardEncoding.slice();
|
||||
break;
|
||||
default:
|
||||
warn('Unknown type of font: ' + type);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
// firstChar and width are required
|
||||
// (except for 14 standard fonts)
|
||||
var firstChar = xref.fetchIfRef(fontDict.get('FirstChar')) || 0;
|
||||
var widths = xref.fetchIfRef(fontDict.get('Widths')) || [];
|
||||
// merge in the differences
|
||||
var firstChar = properties.firstChar;
|
||||
var lastChar = properties.lastChar;
|
||||
var glyphs = {};
|
||||
for (var i = firstChar; i <= lastChar; i++) {
|
||||
var glyph = differences[i] || baseEncoding[i];
|
||||
if (glyph) {
|
||||
var index = GlyphsUnicode[glyph] || i;
|
||||
glyphs[glyph] = map[i] = index;
|
||||
|
||||
var lastChar = xref.fetchIfRef(fontDict.get('LastChar'));
|
||||
if (!lastChar)
|
||||
lastChar = diffEncoding.length || baseEncoding.length;
|
||||
// If there is no file, the character mapping can't be modified
|
||||
// but this is unlikely that there is any standard encoding with
|
||||
// chars below 0x1f, so that's fine.
|
||||
if (!properties.file)
|
||||
continue;
|
||||
|
||||
// merge in the differences
|
||||
var glyphsMap = {};
|
||||
for (var i = firstChar; i <= lastChar; i++) {
|
||||
var glyph = diffEncoding[i] || baseEncoding[i];
|
||||
if (glyph) {
|
||||
var index = GlyphsUnicode[glyph] || i;
|
||||
glyphsMap[glyph] = encodingMap[i] = index;
|
||||
|
||||
if (!fontFile)
|
||||
continue;
|
||||
|
||||
if (index <= 0x1f || (index >= 127 && index <= 255))
|
||||
glyphsMap[glyph] = encodingMap[i] += kCmapGlyphOffset;
|
||||
}
|
||||
if (index <= 0x1f || (index >= 127 && index <= 255))
|
||||
glyphs[glyph] = map[i] += kCmapGlyphOffset;
|
||||
}
|
||||
}
|
||||
|
||||
if (fontType == 'TrueType' && fontDict.has('ToUnicode') &&
|
||||
differences) {
|
||||
var cmapObj = xref.fetchIfRef(fontDict.get('ToUnicode'));
|
||||
if (IsName(cmapObj)) {
|
||||
error('ToUnicode file cmap translation not implemented');
|
||||
} else if (IsStream(cmapObj)) {
|
||||
var tokens = [];
|
||||
var token = '';
|
||||
var beginArrayToken = {};
|
||||
if (type == 'TrueType' && dict.has('ToUnicode') && differences) {
|
||||
var cmapObj = xref.fetchIfRef(dict.get('ToUnicode'));
|
||||
if (IsName(cmapObj)) {
|
||||
error('ToUnicode file cmap translation not implemented');
|
||||
} else if (IsStream(cmapObj)) {
|
||||
var tokens = [];
|
||||
var token = '';
|
||||
var beginArrayToken = {};
|
||||
|
||||
var cmap = cmapObj.getBytes(cmapObj.length);
|
||||
for (var i = 0; i < cmap.length; i++) {
|
||||
var byte = cmap[i];
|
||||
if (byte == 0x20 || byte == 0x0D || byte == 0x0A ||
|
||||
byte == 0x3C || byte == 0x5B || byte == 0x5D) {
|
||||
switch (token) {
|
||||
case 'usecmap':
|
||||
error('usecmap is not implemented');
|
||||
break;
|
||||
var cmap = cmapObj.getBytes(cmapObj.length);
|
||||
for (var i = 0; i < cmap.length; i++) {
|
||||
var byte = cmap[i];
|
||||
if (byte == 0x20 || byte == 0x0D || byte == 0x0A ||
|
||||
byte == 0x3C || byte == 0x5B || byte == 0x5D) {
|
||||
switch (token) {
|
||||
case 'usecmap':
|
||||
error('usecmap is not implemented');
|
||||
break;
|
||||
|
||||
case 'beginbfchar':
|
||||
case 'beginbfrange':
|
||||
case 'begincidchar':
|
||||
case 'begincidrange':
|
||||
token = '';
|
||||
tokens = [];
|
||||
break;
|
||||
case 'beginbfchar':
|
||||
case 'beginbfrange':
|
||||
case 'begincidchar':
|
||||
case 'begincidrange':
|
||||
token = '';
|
||||
tokens = [];
|
||||
break;
|
||||
|
||||
case 'endcidrange':
|
||||
case 'endbfrange':
|
||||
for (var j = 0; j < tokens.length; j += 3) {
|
||||
var startRange = tokens[j];
|
||||
var endRange = tokens[j + 1];
|
||||
var code = tokens[j + 2];
|
||||
while (startRange < endRange) {
|
||||
encodingMap[startRange] = code++;
|
||||
++startRange;
|
||||
}
|
||||
case 'endcidrange':
|
||||
case 'endbfrange':
|
||||
for (var j = 0; j < tokens.length; j += 3) {
|
||||
var startRange = tokens[j];
|
||||
var endRange = tokens[j + 1];
|
||||
var code = tokens[j + 2];
|
||||
while (startRange < endRange) {
|
||||
map[startRange] = code++;
|
||||
++startRange;
|
||||
}
|
||||
break;
|
||||
}
|
||||
break;
|
||||
|
||||
case 'endcidchar':
|
||||
case 'endbfchar':
|
||||
for (var j = 0; j < tokens.length; j += 2) {
|
||||
var index = tokens[j];
|
||||
var code = tokens[j + 1];
|
||||
encodingMap[index] = code;
|
||||
}
|
||||
break;
|
||||
case 'endcidchar':
|
||||
case 'endbfchar':
|
||||
for (var j = 0; j < tokens.length; j += 2) {
|
||||
var index = tokens[j];
|
||||
var code = tokens[j + 1];
|
||||
map[index] = code;
|
||||
}
|
||||
break;
|
||||
|
||||
case '':
|
||||
break;
|
||||
case '':
|
||||
break;
|
||||
|
||||
default:
|
||||
if (token[0] >= '0' && token[0] <= '9')
|
||||
token = parseInt(token, 10); // a number
|
||||
tokens.push(token);
|
||||
token = '';
|
||||
break;
|
||||
}
|
||||
switch (byte) {
|
||||
case 0x5B:
|
||||
// begin list parsing
|
||||
tokens.push(beginArrayToken);
|
||||
break;
|
||||
case 0x5D:
|
||||
// collect array items
|
||||
var items = [], item;
|
||||
while (tokens.length &&
|
||||
(item = tokens.pop()) != beginArrayToken)
|
||||
default:
|
||||
if (token[0] >= '0' && token[0] <= '9')
|
||||
token = parseInt(token, 10); // a number
|
||||
tokens.push(token);
|
||||
token = '';
|
||||
break;
|
||||
}
|
||||
switch (byte) {
|
||||
case 0x5B:
|
||||
// begin list parsing
|
||||
tokens.push(beginArrayToken);
|
||||
break;
|
||||
case 0x5D:
|
||||
// collect array items
|
||||
var items = [], item;
|
||||
while (tokens.length &&
|
||||
(item = tokens.pop()) != beginArrayToken)
|
||||
items.unshift(item);
|
||||
tokens.push(items);
|
||||
break;
|
||||
}
|
||||
} else if (byte == 0x3E) {
|
||||
if (token.length) {
|
||||
// parsing hex number
|
||||
tokens.push(parseInt(token, 16));
|
||||
token = '';
|
||||
}
|
||||
} else {
|
||||
token += String.fromCharCode(byte);
|
||||
break;
|
||||
}
|
||||
} else if (byte == 0x3E) {
|
||||
if (token.length) {
|
||||
// parsing hex number
|
||||
tokens.push(parseInt(token, 16));
|
||||
token = '';
|
||||
}
|
||||
} else {
|
||||
token += String.fromCharCode(byte);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (!fd) {
|
||||
var baseFontName = fontDict.get('BaseFont');
|
||||
return glyphs;
|
||||
},
|
||||
|
||||
translateFont: function(dict, xref, resources) {
|
||||
var subType = dict.get('Subtype');
|
||||
assertWellFormed(IsName(subType), 'invalid font Subtype');
|
||||
|
||||
var composite = false
|
||||
if (subType.name == 'Type0') {
|
||||
// If font is a composite
|
||||
// - get the descendant font
|
||||
// - set the type according to the descendant font
|
||||
// - get the FontDescriptor from the descendant font
|
||||
var df = dict.get('DescendantFonts');
|
||||
if (!df)
|
||||
return null;
|
||||
|
||||
if (IsRef(df))
|
||||
df = xref.fetch(df);
|
||||
|
||||
dict = xref.fetch(IsRef(df) ? df : df[0]);
|
||||
|
||||
subType = dict.get('Subtype');
|
||||
assertWellFormed(IsName(subType), 'invalid font Subtype');
|
||||
composite = true;
|
||||
}
|
||||
|
||||
// Before PDF 1.5 if the font was one of the base 14 fonts, having a
|
||||
// FontDescriptor was not required. This case is here for compatibility.
|
||||
var descriptor = xref.fetchIfRef(dict.get('FontDescriptor'));
|
||||
if (!descriptor) {
|
||||
var baseFontName = dict.get('BaseFont');
|
||||
if (!IsName(baseFontName))
|
||||
return null;
|
||||
|
||||
// Using base font name as a font name.
|
||||
baseFontName = baseFontName.name;
|
||||
var map = {};
|
||||
if (/^Symbol(-?(Bold|Italic))*$/.test(baseFontName)) {
|
||||
// special case for symbols
|
||||
var encoding = Encodings.symbolsEncoding;
|
||||
for (var i = 0, n = encoding.length, j; i < n; i++) {
|
||||
if (!(j = encoding[i]))
|
||||
continue;
|
||||
encodingMap[i] = GlyphsUnicode[j] || 0;
|
||||
map[i] = GlyphsUnicode[j] || 0;
|
||||
}
|
||||
}
|
||||
return {
|
||||
name: baseFontName,
|
||||
fontDict: fontDict,
|
||||
dict: dict,
|
||||
properties: {
|
||||
encoding: encodingMap
|
||||
encoding: map
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
var descriptor = xref.fetch(fd);
|
||||
// According to the spec if 'FontDescriptor' is declared, 'FirstChar',
|
||||
// 'LastChar' and 'Widths' should exists too, but some PDF encoders seems
|
||||
// to ignore this rule when a variant of a standart font is used.
|
||||
// TODO Fill the width array depending on which of the base font this is
|
||||
// a variant.
|
||||
var firstChar = xref.fetchIfRef(dict.get('FirstChar')) || 0;
|
||||
var lastChar = xref.fetchIfRef(dict.get('LastChar')) || 256;
|
||||
var widths = xref.fetchIfRef(dict.get('Widths')) || [];
|
||||
|
||||
var fontName = xref.fetchIfRef(descriptor.get('FontName'));
|
||||
assertWellFormed(IsName(fontName), 'invalid font name');
|
||||
fontName = fontName.name;
|
||||
|
||||
var fontFile = descriptor.get('FontFile', 'FontFile2', 'FontFile3');
|
||||
var length1, length2;
|
||||
if (fontFile) {
|
||||
fontFile = xref.fetchIfRef(fontFile);
|
||||
|
||||
if (fontFile.dict) {
|
||||
var fileType = fontFile.dict.get('Subtype');
|
||||
if (fileType)
|
||||
fileType = fileType.name;
|
||||
|
||||
var length1 = fontFile.dict.get('Length1');
|
||||
if (!IsInt(length1))
|
||||
length1 = xref.fetchIfRef(length1);
|
||||
|
||||
var length2 = fontFile.dict.get('Length2');
|
||||
if (!IsInt(length2))
|
||||
length2 = xref.fetchIfRef(length2);
|
||||
}
|
||||
|
||||
length1 = fontFile.dict.get('Length1');
|
||||
if (!IsInt(length1))
|
||||
length1 = xref.fetchIfRef(length1);
|
||||
|
||||
length2 = fontFile.dict.get('Length2');
|
||||
if (!IsInt(length2))
|
||||
length2 = xref.fetchIfRef(length2);
|
||||
}
|
||||
|
||||
var widths = fontDict.get('Widths');
|
||||
if (widths) {
|
||||
var glyphWidths = {};
|
||||
var unicode = fontDict.get('FirstChar');
|
||||
for (var i = 0, ii = widths.length; i < ii; ++i)
|
||||
glyphWidths[unicode++] = widths[i];
|
||||
}
|
||||
|
||||
var properties = {
|
||||
type: subType.name,
|
||||
subtype: fileType,
|
||||
widths: glyphWidths,
|
||||
encoding: encodingMap,
|
||||
differences: diffEncoding,
|
||||
glyphs: glyphsMap || GlyphsUnicode,
|
||||
firstChar: fontDict.get('FirstChar'),
|
||||
lastChar: fontDict.get('LastChar'),
|
||||
file: fontFile,
|
||||
length1: length1,
|
||||
length2: length2,
|
||||
composite: composite,
|
||||
fixedPitch: false,
|
||||
textMatrix: IDENTITY_MATRIX,
|
||||
firstChar: firstChar || 0,
|
||||
lastChar: lastChar || 256,
|
||||
bbox: descriptor.get('FontBBox'),
|
||||
ascent: descriptor.get('Ascent'),
|
||||
descent: descriptor.get('Descent'),
|
||||
@ -4474,16 +4472,23 @@ var PartialEvaluator = (function() {
|
||||
capHeight: descriptor.get('CapHeight'),
|
||||
flags: descriptor.get('Flags'),
|
||||
italicAngle: descriptor.get('ItalicAngle'),
|
||||
fixedPitch: false,
|
||||
textMatrix: IDENTITY_MATRIX,
|
||||
compositeFont: compositeFont,
|
||||
length1: length1,
|
||||
length2: length2
|
||||
differences: [],
|
||||
widths: [],
|
||||
encoding: {}
|
||||
};
|
||||
|
||||
// XXX Encoding and Glyphs should point to the same object so it will
|
||||
// be hard to be out of sync. The object could contains the unicode and
|
||||
// the width of the glyph.
|
||||
for (var i = 0; i <= widths.length; i++)
|
||||
properties.widths[firstChar++] = widths[i];
|
||||
|
||||
properties.glyphs = this.extractEncoding(dict, xref, properties);
|
||||
log(properties.encoding);
|
||||
|
||||
return {
|
||||
name: fontName,
|
||||
fontDict: fontDict,
|
||||
name: fontName.name,
|
||||
dict: dict,
|
||||
file: fontFile,
|
||||
properties: properties
|
||||
};
|
||||
@ -4887,7 +4892,7 @@ var CanvasGraphics = (function() {
|
||||
// This is a poor simulation for Arial Narrow while font-stretch
|
||||
// is not implemented (bug 3512)
|
||||
if (current.font.narrow) {
|
||||
textHScale += 0.2;
|
||||
textHScale += 0.6;
|
||||
charSpacing -= (0.09 * current.fontSize);
|
||||
}
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user