Class: PDFBeads::PDFBuilder::FontDataProvider

Inherits:

Object

Object
PDFBeads::PDFBuilder::FontDataProvider

Defined in:: lib/pdfbeads/pdffont.rb

Overview

This class provides auxiliary data (such as basic font properties or a width and a PostScript name for an arbitrary Unicode codepoint) for building a PDF font object with an arbitrary set of supported characters. Note that the returned properties (both of the entire font and individual characters) are hardcoded and correspond to those of Times New Roman. The reason is that we need this font just for a hidden text layer, so visual appearance doesn’t matter.

Instance Attribute Summary collapse

#header ⇒ Object readonly

Access a hardcoded set of standard font properties (Ascent, Descent, etc.).

Instance Method Summary collapse

#chardata(uni) ⇒ Object
#getCMAP(enc) ⇒ Object

Take an array of UTF-8 characters and return the corresponding ToUnicode cmap object.
#getEncoding(enc) ⇒ Object

Take an array of UTF-8 characters and return an array of the corresponding PostScript glyph names.
#getLineWidth(line, size) ⇒ Object

Return the width of a given UTF-8 string formatted with our hardcoded font at a given point size.
#getWidths(enc) ⇒ Object

Take an array of UTF-8 characters and return an array of the corresponding glyph widths.
#initialize ⇒ FontDataProvider constructor

A new instance of FontDataProvider.

Constructor Details

#initialize ⇒ `FontDataProvider`

Returns a new instance of FontDataProvider.

# File 'lib/pdfbeads/pdffont.rb', line 46

def initialize()
  @header = Hash[
    'Ascent'      => 694,
    'XHeight'     => 447,
    'CapHeight'   => 662,
    'Descent'     => -213,
    'Flags'       => 34,
    'FontBBox'    => '[ -79 -216 1009 913 ]',
    'ItalicAngle' => 0,
    'StemV'       => 81
  ]

  @chardata = Hash[
    -1     => ["/.notdef", 250],
    0x0020 => ["/space", 250],
    0x0021 => ["/exclam", 333],
    0x0022 => ["/quotedbl", 408],
    0x0023 => ["/numbersign", 500],
    0x0024 => ["/dollar", 500],
    0x0025 => ["/percent", 833],
    0x0026 => ["/ampersand", 778],
    0x0027 => ["/quotesingle", 180],
    0x0028 => ["/parenleft", 333],
    0x0029 => ["/parenright", 333],
    0x002A => ["/asterisk", 500],
    0x002B => ["/plus", 564],
    0x002C => ["/comma", 250],
    0x002D => ["/hyphen", 333],
    0x002E => ["/period", 250],
    0x002F => ["/slash", 278],
    0x0030 => ["/zero", 500],
    0x0031 => ["/one", 500],
    0x0032 => ["/two", 500],
    0x0033 => ["/three", 500],
    0x0034 => ["/four", 500],
    0x0035 => ["/five", 500],
    0x0036 => ["/six", 500],
    0x0037 => ["/seven", 500],
    0x0038 => ["/eight", 500],
    0x0039 => ["/nine", 500],
    0x003A => ["/colon", 278],
    0x003B => ["/semicolon", 278],
    0x003C => ["/less", 564],
    0x003D => ["/equal", 564],
    0x003E => ["/greater", 564],
    0x003F => ["/question", 444],
    0x0040 => ["/at", 921],
    0x0041 => ["/A", 722],
    0x0042 => ["/B", 667],
    0x0043 => ["/C", 667],
    0x0044 => ["/D", 722],
    0x0045 => ["/E", 611],
    0x0046 => ["/F", 556],
    0x0047 => ["/G", 722],
    0x0048 => ["/H", 722],
    0x0049 => ["/I", 333],
    0x004A => ["/J", 389],
    0x004B => ["/K", 722],
    0x004C => ["/L", 611],
    0x004D => ["/M", 889],
    0x004E => ["/N", 722],
    0x004F => ["/O", 722],
    0x0050 => ["/P", 556],
    0x0051 => ["/Q", 722],
    0x0052 => ["/R", 667],
    0x0053 => ["/S", 556],
    0x0054 => ["/T", 611],
    0x0055 => ["/U", 722],
    0x0056 => ["/V", 722],
    0x0057 => ["/W", 944],
    0x0058 => ["/X", 722],
    0x0059 => ["/Y", 722],
    0x005A => ["/Z", 611],
    0x005B => ["/bracketleft", 333],
    0x005C => ["/backslash", 278],
    0x005D => ["/bracketright", 333],
    0x005E => ["/asciicircum", 469],
    0x005F => ["/underscore", 500],
    0x0060 => ["/grave", 333],
    0x0061 => ["/a", 444],
    0x0062 => ["/b", 500],
    0x0063 => ["/c", 444],
    0x0064 => ["/d", 500],
    0x0065 => ["/e", 444],
    0x0066 => ["/f", 333],
    0x0067 => ["/g", 500],
    0x0068 => ["/h", 500],
    0x0069 => ["/i", 278],
    0x006A => ["/j", 278],
    0x006B => ["/k", 500],
    0x006C => ["/l", 278],
    0x006D => ["/m", 778],
    0x006E => ["/n", 500],
    0x006F => ["/o", 500],
    0x0070 => ["/p", 500],
    0x0071 => ["/q", 500],
    0x0072 => ["/r", 333],
    0x0073 => ["/s", 389],
    0x0074 => ["/t", 278],
    0x0075 => ["/u", 500],
    0x0076 => ["/v", 500],
    0x0077 => ["/w", 722],
    0x0078 => ["/x", 500],
    0x0079 => ["/y", 500],
    0x007A => ["/z", 444],
    0x007B => ["/braceleft", 480],
    0x007C => ["/bar", 200],
    0x007D => ["/braceright", 480],
    0x007E => ["/asciitilde", 541],
    0x00A1 => ["/exclamdown", 333],
    0x00A2 => ["/cent", 500],
    0x00A3 => ["/sterling", 500],
    0x00A4 => ["/currency", 500],
    0x00A5 => ["/yen", 500],
    0x00A6 => ["/brokenbar", 200],
    0x00A7 => ["/section", 500],
    0x00A8 => ["/dieresis", 333],
    0x00A9 => ["/copyright", 760],
    0x00AA => ["/ordfeminine", 276],
    0x00AB => ["/guillemotleft", 500],
    0x00AC => ["/logicalnot", 564],
    0x00AD => ["/softhyphen", 333],
    0x00AE => ["/registered", 760],
    0x00AF => ["/macron", 333],
    0x00B0 => ["/degree", 400],
    0x00B1 => ["/plusminus", 564],
    0x00B2 => ["/twosuperior", 300],
    0x00B3 => ["/threesuperior", 300],
    0x00B4 => ["/acute", 333],
    0x00B5 => ["/mu", 500],
    0x00B6 => ["/paragraph", 453],
    0x00B7 => ["/periodcentered", 250],
    0x00B8 => ["/cedilla", 333],
    0x00B9 => ["/onesuperior", 300],
    0x00BA => ["/ordmasculine", 310],
    0x00BB => ["/guillemotright", 500],
    0x00BC => ["/onequarter", 750],
    0x00BD => ["/onehalf", 750],
    0x00BE => ["/threequarters", 750],
    0x00BF => ["/questiondown", 444],
    0x00C0 => ["/Agrave", 722],
    0x00C1 => ["/Aacute", 722],
    0x00C2 => ["/Acircumflex", 722],
    0x00C3 => ["/Atilde", 722],
    0x00C4 => ["/Adieresis", 722],
    0x00C5 => ["/Aring", 722],
    0x00C6 => ["/AE", 889],
    0x00C7 => ["/Ccedilla", 667],
    0x00C8 => ["/Egrave", 611],
    0x00C9 => ["/Eacute", 611],
    0x00CA => ["/Ecircumflex", 611],
    0x00CB => ["/Edieresis", 611],
    0x00CC => ["/Igrave", 333],
    0x00CD => ["/Iacute", 333],
    0x00CE => ["/Icircumflex", 333],
    0x00CF => ["/Idieresis", 333],
    0x00D0 => ["/Eth", 722],
    0x00D1 => ["/Ntilde", 722],
    0x00D2 => ["/Ograve", 722],
    0x00D3 => ["/Oacute", 722],
    0x00D4 => ["/Ocircumflex", 722],
    0x00D5 => ["/Otilde", 722],
    0x00D6 => ["/Odieresis", 722],
    0x00D7 => ["/multiply", 564],
    0x00D8 => ["/Oslash", 722],
    0x00D9 => ["/Ugrave", 722],
    0x00DA => ["/Uacute", 722],
    0x00DB => ["/Ucircumflex", 722],
    0x00DC => ["/Udieresis", 722],
    0x00DD => ["/Yacute", 722],
    0x00DE => ["/Thorn", 556],
    0x00DF => ["/germandbls", 500],
    0x00E0 => ["/agrave", 444],
    0x00E1 => ["/aacute", 444],
    0x00E2 => ["/acircumflex", 444],
    0x00E3 => ["/atilde", 444],
    0x00E4 => ["/adieresis", 444],
    0x00E5 => ["/aring", 444],
    0x00E6 => ["/ae", 667],
    0x00E7 => ["/ccedilla", 444],
    0x00E8 => ["/egrave", 444],
    0x00E9 => ["/eacute", 444],
    0x00EA => ["/ecircumflex", 444],
    0x00EB => ["/edieresis", 444],
    0x00EC => ["/igrave", 278],
    0x00ED => ["/iacute", 278],
    0x00EE => ["/icircumflex", 278],
    0x00EF => ["/idieresis", 278],
    0x00F0 => ["/eth", 500],
    0x00F1 => ["/ntilde", 500],
    0x00F2 => ["/ograve", 500],
    0x00F3 => ["/oacute", 500],
    0x00F4 => ["/ocircumflex", 500],
    0x00F5 => ["/otilde", 500],
    0x00F6 => ["/odieresis", 500],
    0x00F7 => ["/divide", 564],
    0x00F8 => ["/oslash", 500],
    0x00F9 => ["/ugrave", 500],
    0x00FA => ["/uacute", 500],
    0x00FB => ["/ucircumflex", 500],
    0x00FC => ["/udieresis", 500],
    0x00FD => ["/yacute", 500],
    0x00FE => ["/thorn", 500],
    0x00FF => ["/ydieresis", 500],
    0x0131 => ["/dotlessi", 278],
    0x0141 => ["/Lslash", 611],
    0x0142 => ["/lslash", 278],
    0x0152 => ["/OE", 889],
    0x0153 => ["/oe", 722],
    0x0160 => ["/Scaron", 556],
    0x0161 => ["/scaron", 389],
    0x0178 => ["/Ydieresis", 722],
    0x017D => ["/Zcaron", 611],
    0x017E => ["/zcaron", 444],
    0x0192 => ["/florin", 488],
    0x02C6 => ["/circumflex", 333],
    0x02C7 => ["/caron", 333],
    0x02D8 => ["/breve", 333],
    0x02D9 => ["/dotaccent", 333],
    0x02DA => ["/ring", 333],
    0x02DB => ["/ogonek", 333],
    0x02DC => ["/tilde", 333],
    0x02DD => ["/hungarumlaut", 333],
    0x0394 => ["/Delta", 643],
    0x0401 => ["/afii10023", 611],
    0x0402 => ["/afii10051", 752],
    0x0403 => ["/afii10052", 578],
    0x0404 => ["/afii10053", 660],
    0x0405 => ["/afii10054", 556],
    0x0406 => ["/afii10055", 333],
    0x0407 => ["/afii10056", 333],
    0x0408 => ["/afii10057", 389],
    0x0409 => ["/afii10058", 872],
    0x040A => ["/afii10059", 872],
    0x040B => ["/afii10060", 741],
    0x040C => ["/afii10061", 667],
    0x040E => ["/afii10062", 708],
    0x040F => ["/afii10145", 722],
    0x0410 => ["/afii10017", 722],
    0x0411 => ["/afii10018", 574],
    0x0412 => ["/afii10019", 667],
    0x0413 => ["/afii10020", 578],
    0x0414 => ["/afii10021", 682],
    0x0415 => ["/afii10022", 611],
    0x0416 => ["/afii10024", 896],
    0x0417 => ["/afii10025", 501],
    0x0418 => ["/afii10026", 722],
    0x0419 => ["/afii10027", 722],
    0x041A => ["/afii10028", 667],
    0x041B => ["/afii10029", 678],
    0x041C => ["/afii10030", 889],
    0x041D => ["/afii10031", 722],
    0x041E => ["/afii10032", 722],
    0x041F => ["/afii10033", 722],
    0x0420 => ["/afii10034", 556],
    0x0421 => ["/afii10035", 667],
    0x0422 => ["/afii10036", 611],
    0x0423 => ["/afii10037", 708],
    0x0424 => ["/afii10038", 790],
    0x0425 => ["/afii10039", 722],
    0x0426 => ["/afii10040", 722],
    0x0427 => ["/afii10041", 650],
    0x0428 => ["/afii10042", 1009],
    0x0429 => ["/afii10043", 1009],
    0x042A => ["/afii10044", 706],
    0x042B => ["/afii10045", 872],
    0x042C => ["/afii10046", 574],
    0x042D => ["/afii10047", 660],
    0x042E => ["/afii10048", 1028],
    0x042F => ["/afii10049", 667],
    0x0430 => ["/afii10065", 444],
    0x0431 => ["/afii10066", 509],
    0x0432 => ["/afii10067", 472],
    0x0433 => ["/afii10068", 410],
    0x0434 => ["/afii10069", 509],
    0x0435 => ["/afii10070", 444],
    0x0436 => ["/afii10072", 691],
    0x0437 => ["/afii10073", 395],
    0x0438 => ["/afii10074", 535],
    0x0439 => ["/afii10075", 535],
    0x043A => ["/afii10076", 486],
    0x043B => ["/afii10077", 499],
    0x043C => ["/afii10078", 633],
    0x043D => ["/afii10079", 535],
    0x043E => ["/afii10080", 500],
    0x043F => ["/afii10081", 535],
    0x0440 => ["/afii10082", 500],
    0x0441 => ["/afii10083", 444],
    0x0442 => ["/afii10084", 437],
    0x0443 => ["/afii10085", 500],
    0x0444 => ["/afii10086", 648],
    0x0445 => ["/afii10087", 500],
    0x0446 => ["/afii10088", 535],
    0x0447 => ["/afii10089", 503],
    0x0448 => ["/afii10090", 770],
    0x0449 => ["/afii10091", 770],
    0x044A => ["/afii10092", 517],
    0x044B => ["/afii10093", 672],
    0x044C => ["/afii10094", 456],
    0x044D => ["/afii10095", 429],
    0x044E => ["/afii10096", 747],
    0x044F => ["/afii10097", 460],
    0x0451 => ["/afii10071", 444],
    0x0452 => ["/afii10099", 483],
    0x0453 => ["/afii10100", 410],
    0x0454 => ["/afii10101", 429],
    0x0455 => ["/afii10102", 389],
    0x0456 => ["/afii10103", 278],
    0x0457 => ["/afii10104", 278],
    0x0458 => ["/afii10105", 278],
    0x0459 => ["/afii10106", 727],
    0x045A => ["/afii10107", 723],
    0x045B => ["/afii10108", 500],
    0x045C => ["/afii10109", 486],
    0x045E => ["/afii10110", 500],
    0x045F => ["/afii10193", 535],
    0x0462 => ["/afii10146", 648],
    0x0463 => ["/afii10194", 514],
    0x0472 => ["/afii10147", 722],
    0x0473 => ["/afii10195", 500],
    0x0474 => ["/afii10148", 771],
    0x0475 => ["/afii10196", 536],
    0x0490 => ["/afii10050", 450],
    0x0491 => ["/afii10098", 351],
    0x2013 => ["/endash", 500],
    0x2014 => ["/emdash", 1000],
    0x2018 => ["/quoteleft", 333],
    0x2019 => ["/quoteright", 333],
    0x201A => ["/quotesinglbase", 333],
    0x201C => ["/quotedblleft", 444],
    0x201D => ["/quotedblright", 444],
    0x201E => ["/quotedblbase", 444],
    0x2020 => ["/dagger", 500],
    0x2021 => ["/daggerdbl", 500],
    0x2022 => ["/bullet", 350],
    0x2026 => ["/ellipsis", 1000],
    0x2030 => ["/perthousand", 1000],
    0x2039 => ["/guilsinglleft", 333],
    0x203A => ["/guilsinglright", 333],
    0x20AC => ["/Euro", 500],
    0x2116 => ["/afii61352", 954],
    0x2122 => ["/trademark", 980],
    0x2202 => ["/partialdiff", 490],
    0x2212 => ["/minus", 564],
    0x221A => ["/radical", 552],
    0x221E => ["/infinity", 708],
    0x2248 => ["/approxequal", 564],
    0x2260 => ["/notequal", 564],
    0x2264 => ["/lessequal", 564],
    0x2265 => ["/greaterequal", 564],
    0xFB01 => ["/fi", 556],
    0xFB02 => ["/fl", 556],
  ]

  @encodings = Array.new()
  @wlists = Array.new()
end

Instance Attribute Details

#header ⇒ `Object` (readonly)

Access a hardcoded set of standard font properties (Ascent, Descent, etc.)



44
45
46

# File 'lib/pdfbeads/pdffont.rb', line 44

def header
  @header
end

Instance Method Details

#chardata(uni) ⇒ `Object`

# File 'lib/pdfbeads/pdffont.rb', line 531

def chardata( uni )
  @chardata.fetch( uni ) do |u|
    [ sprintf( "/uni%04X",uni ), 500 ]
  end
end

#getCMAP(enc) ⇒ `Object`

Take an array of UTF-8 characters and return the corresponding ToUnicode cmap object

# File 'lib/pdfbeads/pdffont.rb', line 444

def getCMAP( enc )
  cmap = [
    "/CIDInit /ProcSet findresource begin\n",
    "12 dict begin\n",
    "begincmap\n",
    "/CIDSystemInfo\n",
    "<<\n",
    "  /Registry ( PDFBeads )\n",
    "  /Ordering ( Custom )\n",
    "  /Supplement 0\n",
    ">> def\n",
    "/CMapName /PDFBeads-Custom def\n",
    "/CMapType 2 def\n",
    "1 begincodespacerange\n",
    "<00> <FF>\n",
    "endcodespacerange\n",
  ].join( '' )
  ranges = Array.new()
  cur_range = nil
  prev = -1
  numbfchar = 0
  enc.each_index do |i|
    cur = enc[i].ord
    if cur == prev + 1
      if cur_range.nil?
        cur_range = Hash[
          'start' => i-1,
          'end'   => i,
          'uni'   => prev
        ]
        numbfchar -= 1
      else
        cur_range['end'] = i
      end
    elsif cur_range != nil
      ranges << cur_range
      cur_range = nil
    end

    if cur_range.nil? and cur != -1
      numbfchar += 1
    end
    prev = cur
  end

  unless cur_range.nil?
    ranges << cur_range
    cur_range = nil
  end

  if ranges.length > 0
    cmap << "#{ranges.length} beginbfrange\n"
    ranges.each do |cr|
      cmap << sprintf( "<%02X> <%02X> <%04X>\n",
        cr['start'], cr['end'], cr['uni'] )
    end
    cmap << "endbfrange\n"
  end

  if numbfchar > 0
    cmap += "%d beginbfchar\n" % numbfchar
    enc.each_index do |i|
      in_range = false
      ranges.each do |cr|
        if i >= cr['start'] and i <= cr['end']
          in_range = true
          break
        end
      end

      cmap << sprintf( "<%02X> <%04X>\n", i, enc[i].ord ) unless in_range
    end

    cmap << "endbfchar\n"
  end

  cmap << "endcmap\n"
  cmap << "CMapName currentdict /CMap defineresource pop\n"
  cmap << "end\n"
  cmap << "end\n"

  toUnicode = PDFBuilder::XObj.new( Hash[
    'Filter' => '/FlateDecode',
  ], Zlib::Deflate.deflate( cmap,9 ) )
  toUnicode
end

#getEncoding(enc) ⇒ `Object`

Take an array of UTF-8 characters and return an array of the corresponding PostScript glyph names

# File 'lib/pdfbeads/pdffont.rb', line 424

def getEncoding( enc )
  ret = Array.new()
  enc.each do |char|
    ret << chardata( char.ord )[0]
  end
  ret
end

#getLineWidth(line, size) ⇒ `Object`

Return the width of a given UTF-8 string formatted with our hardcoded font at a given point size

# File 'lib/pdfbeads/pdffont.rb', line 406

def getLineWidth( line,size )
  w = 0.0
  line.each_char do |uc|
    begin
      w += chardata( uc.ord )[1] * size / 1000.0
    rescue
      rawbytes = uc.unpack( 'C*' )
      bs = ''
      rawbytes.each{ |b| bs << sprintf( "%02x",b ) }
      $stderr.puts( "Warning: an invalid UTF-8 sequence (#{bs}) in the hOCR data." )
      w += ( @chardata[0x003F][1] * size / 1000.0 ) * rawbytes.length
    end
  end
  w.to_f
end

#getWidths(enc) ⇒ `Object`

Take an array of UTF-8 characters and return an array of the corresponding glyph widths

# File 'lib/pdfbeads/pdffont.rb', line 434

def getWidths( enc )
  ret = Array.new()
  enc.each do |char|
    ret << chardata( char.ord )[1]
  end
  ret
end

Class: PDFBeads::PDFBuilder::FontDataProvider

Overview

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ FontDataProvider

Instance Attribute Details

#header ⇒ Object (readonly)

Instance Method Details

#chardata(uni) ⇒ Object

#getCMAP(enc) ⇒ Object

#getEncoding(enc) ⇒ Object

#getLineWidth(line, size) ⇒ Object