protected override void OnLoad(
)
{
LoadEncoding();
// Glyph widths.
{
glyphWidths = new Dictionary <int, int>();
PdfArray glyphWidthObjects = (PdfArray)CIDFontDictionary.Resolve(PdfName.W);
if (glyphWidthObjects != null)
{
for (IEnumerator <PdfDirectObject> iterator = glyphWidthObjects.GetEnumerator(); iterator.MoveNext();)
{
//TODO: this algorithm is valid only in case cid-to-gid mapping is identity (see cidtogid map)!!
/*
* NOTE: Font widths are grouped in one of the following formats [PDF:1.6:5.6.3]:
* 1. startCID [glyphWidth1 glyphWidth2 ... glyphWidthn]
* 2. startCID endCID glyphWidth
*/
int startCID = ((PdfInteger)iterator.Current).RawValue;
iterator.MoveNext();
PdfDirectObject glyphWidthObject2 = iterator.Current;
if (glyphWidthObject2 is PdfArray) // Format 1: startCID [glyphWidth1 glyphWidth2 ... glyphWidthn].
{
int cID = startCID;
foreach (PdfDirectObject glyphWidthObject in (PdfArray)glyphWidthObject2)
{
glyphWidths[cID++] = ((PdfInteger)glyphWidthObject).RawValue;
}
}
else // Format 2: startCID endCID glyphWidth.
{
int endCID = ((PdfInteger)glyphWidthObject2).RawValue;
iterator.MoveNext();
int glyphWidth = ((PdfInteger)iterator.Current).RawValue;
for (int cID = startCID; cID <= endCID; cID++)
{
glyphWidths[cID] = glyphWidth;
}
}
}
}
}
// Default glyph width.
{
PdfInteger defaultGlyphWidthObject = (PdfInteger)BaseDataObject[PdfName.W];
defaultGlyphWidth = (defaultGlyphWidthObject == null ? 0 : defaultGlyphWidthObject.RawValue);
}
}
protected void LoadEncoding(
)
{
PdfDataObject encodingObject = BaseDataObject.Resolve(PdfName.Encoding);
// CMap [PDF:1.6:5.6.4].
IDictionary <ByteArray, int> cmap = CMap.Get(encodingObject);
// 1. Unicode.
if (codes == null)
{
codes = new BiDictionary <ByteArray, int>();
if (encodingObject is PdfName &&
!(encodingObject.Equals(PdfName.IdentityH) ||
encodingObject.Equals(PdfName.IdentityV)))
{
/*
* NOTE: According to [PDF:1.6:5.9.1], the fallback method to retrieve
* the character-code-to-Unicode mapping implies getting the UCS2 CMap
* (Unicode value to CID) corresponding to the font's one (character code to CID);
* CIDs are the bridge from character codes to Unicode values.
*/
BiDictionary <ByteArray, int> ucs2CMap;
{
PdfDictionary cidSystemInfo = (PdfDictionary)CIDFontDictionary.Resolve(PdfName.CIDSystemInfo);
String registry = (String)((PdfTextString)cidSystemInfo[PdfName.Registry]).Value;
String ordering = (String)((PdfTextString)cidSystemInfo[PdfName.Ordering]).Value;
String ucs2CMapName = registry + "-" + ordering + "-" + "UCS2";
ucs2CMap = new BiDictionary <ByteArray, int>(CMap.Get(ucs2CMapName));
}
if (ucs2CMap.Count > 0)
{
foreach (KeyValuePair <ByteArray, int> cmapEntry in cmap)
{
codes[cmapEntry.Key] = ConvertUtils.ByteArrayToInt(ucs2CMap.GetKey(cmapEntry.Value).Data);
}
}
}
if (codes.Count == 0)
{
/*
* NOTE: In case no clue is available to determine the Unicode resolution map,
* the font is considered symbolic and an identity map is synthesized instead.
*/
symbolic = true;
foreach (KeyValuePair <ByteArray, int> cmapEntry in cmap)
{
codes[cmapEntry.Key] = ConvertUtils.ByteArrayToInt(cmapEntry.Key.Data);
}
}
}
// 2. Glyph indexes.
/*
* TODO: gids map for glyph indexes as glyphIndexes is used to map cids!!!
*/
// Character-code-to-CID mapping [PDF:1.6:5.6.4,5].
glyphIndexes = new Dictionary <int, int>();
foreach (KeyValuePair <ByteArray, int> cmapEntry in cmap)
{
if (!codes.ContainsKey(cmapEntry.Key))
{
continue;
}
glyphIndexes[codes[cmapEntry.Key]] = cmapEntry.Value;
}
}
