public ImageXObject(
Document context,
PdfStream baseDataObject
)
: base(context,
baseDataObject)
{
/*
NOTE: It's caller responsability to adequately populate the stream
header and body in order to instantiate a valid object; header entries like
'Width', 'Height', 'ColorSpace', 'BitsPerComponent' MUST be defined
appropriately.
*/
baseDataObject.Header[PdfName.Subtype] = PdfName.Image;
}
/**
<summary>Sets the Javascript script into the specified base data object.</summary>
*/
internal static void SetScript(
PdfDictionary baseDataObject,
PdfName key,
string value
)
{
PdfDataObject scriptObject = baseDataObject.Resolve(key);
if(!(scriptObject is PdfStream) && value.Length > 256)
{baseDataObject[key] = baseDataObject.File.Register(scriptObject = new PdfStream());}
// Insert the script!
if(scriptObject is PdfStream)
{
bytes::IBuffer scriptBuffer = ((PdfStream)scriptObject).Body;
scriptBuffer.SetLength(0);
scriptBuffer.Append(value);
}
else
{baseDataObject[key] = new PdfTextString(value);}
}
public virtual PdfObject Visit(
PdfStream obj,
object data
)
{
return obj;
}
public override PdfObject Visit(
PdfStream obj,
object data
)
{
PdfStream clone = (PdfStream)obj.Clone();
{
clone.header = (PdfDictionary)Visit(obj.header, data);
clone.body = obj.body.Clone();
}
return clone;
}
/**
<summary>Gets the character map extracted from the given data.</summary>
<param name="stream">Character map data.</param>
*/
public static IDictionary<ByteArray, int> Get(
PdfStream stream
)
{
return Get(stream.Body);
}
/**
<summary>Creates the character code mapping for composite fonts.</summary>
*/
private void Load_CreateEncoding(
PdfDictionary font,
PdfDictionary cidFont
)
{
// CMap [PDF:1.6:5.6.4].
bytes::Buffer cmapBuffer = new bytes::Buffer();
cmapBuffer.Append(
"%!PS-Adobe-3.0 Resource-CMap\n"
+ "%%DocumentNeededResources: ProcSet (CIDInit)\n"
+ "%%IncludeResource: ProcSet (CIDInit)\n"
+ "%%BeginResource: CMap (Adobe-Identity-UCS)\n"
+ "%%Title: (Adobe-Identity-UCS Adobe Identity 0)\n"
+ "%%Version: 1\n"
+ "%%EndComments\n"
+ "/CIDInit /ProcSet findresource begin\n"
+ "12 dict begin\n"
+ "begincmap\n"
+ "/CIDSystemInfo\n"
+ "3 dict dup begin\n"
+ "/Registry (Adobe) def\n"
+ "/Ordering (Identity) def\n"
+ "/Supplement 0 def\n"
+ "end def\n"
+ "/CMapName /Adobe-Identity-UCS def\n"
+ "/CMapVersion 1 def\n"
+ "/CMapType 0 def\n"
+ "/WMode 0 def\n"
+ "2 begincodespacerange\n"
+ "<20> <20>\n"
+ "<0000> <19FF>\n"
+ "endcodespacerange\n"
+ glyphIndexes.Count + " begincidchar\n"
);
// ToUnicode [PDF:1.6:5.9.2].
bytes::Buffer toUnicodeBuffer = new bytes::Buffer();
toUnicodeBuffer.Append(
"/CIDInit /ProcSet findresource begin\n"
+ "12 dict begin\n"
+ "begincmap\n"
+ "/CIDSystemInfo\n"
+ "<< /Registry (Adobe)\n"
+ "/Ordering (UCS)\n"
+ "/Supplement 0\n"
+ ">> def\n"
+ "/CMapName /Adobe-Identity-UCS def\n"
+ "/CMapVersion 10.001 def\n"
+ "/CMapType 2 def\n"
+ "2 begincodespacerange\n"
+ "<20> <20>\n"
+ "<0000> <19FF>\n"
+ "endcodespacerange\n"
+ glyphIndexes.Count + " beginbfchar\n"
);
// CIDToGIDMap [PDF:1.6:5.6.3].
bytes::Buffer gIdBuffer = new bytes::Buffer();
gIdBuffer.Append((byte)0);
gIdBuffer.Append((byte)0);
int code = 0;
codes = new BiDictionary<ByteArray,int>(glyphIndexes.Count);
PdfArray widthsObject = new PdfArray(glyphWidths.Count);
foreach(KeyValuePair<int,int> glyphIndexEntry in glyphIndexes)
{
// Character code (unicode to codepoint) entry.
code++;
byte[] charCode = (glyphIndexEntry.Key == 32
? new byte[]{32}
: new byte[]
{
(byte)((code >> 8) & 0xFF),
(byte)(code & 0xFF)
});
codes[new ByteArray(charCode)] = glyphIndexEntry.Key;
// CMap entry.
cmapBuffer.Append("<");
toUnicodeBuffer.Append("<");
for(int charCodeBytesIndex = 0,
charCodeBytesLength = charCode.Length;
charCodeBytesIndex < charCodeBytesLength;
charCodeBytesIndex++
)
{
string hex = ((int)charCode[charCodeBytesIndex]).ToString("X2");
cmapBuffer.Append(hex);
toUnicodeBuffer.Append(hex);
}
cmapBuffer.Append("> " + code + "\n");
toUnicodeBuffer.Append("> <" + glyphIndexEntry.Key.ToString("X4") + ">\n");
// CID-to-GID entry.
int glyphIndex = glyphIndexEntry.Value;
gIdBuffer.Append((byte)((glyphIndex >> 8) & 0xFF));
gIdBuffer.Append((byte)(glyphIndex & 0xFF));
// Width.
int width;
if(!glyphWidths.TryGetValue(glyphIndex, out width))
{width = 0;}
else if(width > 1000)
{width = 1000;}
widthsObject.Add(PdfInteger.Get(width));
}
cmapBuffer.Append(
"endcidchar\n"
+ "endcmap\n"
+ "CMapName currentdict /CMap defineresource pop\n"
+ "end\n"
+ "end\n"
+ "%%EndResource\n"
+ "%%EOF"
);
PdfStream cmapStream = new PdfStream(cmapBuffer);
PdfDictionary cmapHead = cmapStream.Header;
cmapHead[PdfName.Type] = PdfName.CMap;
cmapHead[PdfName.CMapName] = new PdfName("Adobe-Identity-UCS");
cmapHead[PdfName.CIDSystemInfo] = new PdfDictionary(
new PdfName[]
{
PdfName.Registry,
PdfName.Ordering,
PdfName.Supplement
},
new PdfDirectObject[]
{
new PdfTextString("Adobe"),
new PdfTextString("Identity"),
PdfInteger.Get(0)
}
); // Generic predefined CMap (Identity-H/V (Adobe-Identity-0)) [PDF:1.6:5.6.4].
font[PdfName.Encoding] = File.Register(cmapStream);
PdfStream gIdStream = new PdfStream(gIdBuffer);
cidFont[PdfName.CIDToGIDMap] = File.Register(gIdStream);
cidFont[PdfName.W] = new PdfArray(new PdfDirectObject[]{PdfInteger.Get(1),widthsObject});
toUnicodeBuffer.Append(
"endbfchar\n"
+ "endcmap\n"
+ "CMapName currentdict /CMap defineresource pop\n"
+ "end\n"
+ "end\n"
);
PdfStream toUnicodeStream = new PdfStream(toUnicodeBuffer);
font[PdfName.ToUnicode] = File.Register(toUnicodeStream);
}
