public FontMetric(XDocument fontXDoc)
{
m_fontName = fontXDoc.Descendants("fontname").FirstOrDefault().Value;
m_fullName = fontXDoc.Descendants("fullname").FirstOrDefault().Value;
m_family = fontXDoc.Descendants("fontfamily").FirstOrDefault().Value;
m_weight = fontXDoc.Descendants("weight").FirstOrDefault().Value;
m_boundingBox[0] = fontXDoc.Descendants("fontbbox").Where(x => x.Name == "xmin").Select(x => double.Parse(x.Value)).FirstOrDefault();
m_boundingBox[1] = fontXDoc.Descendants("fontbbox").Where(x => x.Name == "ymin").Select(x => double.Parse(x.Value)).FirstOrDefault();
m_boundingBox[2] = fontXDoc.Descendants("fontbbox").Where(x => x.Name == "xmax").Select(x => double.Parse(x.Value)).FirstOrDefault();
m_boundingBox[3] = fontXDoc.Descendants("fontbbox").Where(x => x.Name == "ymax").Select(x => double.Parse(x.Value)).FirstOrDefault();
m_capHeight = (double)fontXDoc.Descendants("capheight").FirstOrDefault().Value.DoubleOrNull();
m_xHeight = (double)fontXDoc.Descendants("xheight").FirstOrDefault().Value.DoubleOrNull();
m_ascender = (double)fontXDoc.Descendants("ascender").FirstOrDefault().Value.DoubleOrNull();
m_descender = (double)fontXDoc.Descendants("descender").FirstOrDefault().Value.DoubleOrNull();
m_ruleWidth = fontXDoc.Descendants("rulewidth").FirstOrDefault().Value.DoubleOrNull();
m_vGap = double.Parse(fontXDoc.Descendants("vgap").FirstOrDefault().Value);
// m_stdHw = (double) fontXDoc.Descendants("stdhw").FirstOrDefault().Value.DoubleOrNull();
m_stdVw = (double)fontXDoc.Descendants("stdvw").FirstOrDefault().Value.DoubleOrNull();
m_undelinePosition = (double)fontXDoc.Descendants("underlineposition").FirstOrDefault().Value.DoubleOrNull();
m_underlineThickness = (double)fontXDoc.Descendants("underlinethickness").FirstOrDefault().Value.DoubleOrNull();
m_italicAngle = (double)fontXDoc.Descendants("italicangle").FirstOrDefault().Value.DoubleOrNull();
m_charWidth = (double)fontXDoc.Descendants("charwidth").FirstOrDefault().Value.DoubleOrNull();
m_axisPosition = (double)fontXDoc.Descendants("axisposition").FirstOrDefault().Value.DoubleOrNull();
CharData = fontXDoc.Descendants("char")
.Select(x => new KeyValuePair <int, CharMetric>(
int.Parse(x.Element("charid").Value.Substring(2), NumberStyles.HexNumber),
new CharMetric(
charName: x.Element("name").Value,
codes: x.Descendants("charid").Select(z => (uint)int.Parse(z.Value.Substring(2), NumberStyles.HexNumber)).ToList(),
width: double.Parse(x.Element("w").Value),
bbox: new double[]
{
double.Parse(x.Element("b").Element("xmin").Value),
double.Parse(x.Element("b").Element("ymin").Value),
double.Parse(x.Element("b").Element("xmax").Value),
double.Parse(x.Element("b").Element("ymax").Value)
}))).ToDictionary(kvp => kvp.Key, kvp => kvp.Value);
XElement mg = fontXDoc.Descendants("missingglyph").FirstOrDefault();
m_missingGlyph = new CharMetric(
charName: mg.Element("name").Value,
width: double.Parse(mg.Element("w").Value),
codes: mg.Descendants("charid").Select(x => (uint)int.Parse(x.Value)).ToList(),
bbox: new double[]
{
double.Parse(mg.Element("b").Element("xmin").Value),
double.Parse(mg.Element("b").Element("ymin").Value),
double.Parse(mg.Element("b").Element("xmax").Value),
double.Parse(mg.Element("b").Element("ymax").Value)
});
}
//To Do: Implement. (/fonts/metric)
public FontMetric(XDocument fontXDoc)
{
FontName = fontXDoc.Descendants("fontname").FirstOrDefault().Value;
FullName = fontXDoc.Descendants("fullname").FirstOrDefault().Value;
Family = fontXDoc.Descendants("fontfamily").FirstOrDefault().Value;
Weight = fontXDoc.Descendants("weight").FirstOrDefault().Value;
BBox[0] = fontXDoc.Descendants("fontbbox").Where(x=>x.Name=="xmin").Select(x=> double.Parse(x.Value)).FirstOrDefault();
BBox[1] = fontXDoc.Descendants("fontbbox").Where(x => x.Name == "ymin").Select(x => double.Parse(x.Value)).FirstOrDefault();
BBox[2] = fontXDoc.Descendants("fontbbox").Where(x => x.Name == "xmax").Select(x => double.Parse(x.Value)).FirstOrDefault();
BBox[3] = fontXDoc.Descendants("fontbbox").Where(x => x.Name == "ymax").Select(x => double.Parse(x.Value)).FirstOrDefault();
CapHeight = DoubleOrNull(fontXDoc.Descendants("capheight").FirstOrDefault().Value);
XHeight = DoubleOrNull(fontXDoc.Descendants("xheight").FirstOrDefault().Value);
Ascender= DoubleOrNull(fontXDoc.Descendants("ascender").FirstOrDefault().Value);
Descender = DoubleOrNull(fontXDoc.Descendants("descender").FirstOrDefault().Value);
RuleWidth = DoubleOrNull(fontXDoc.Descendants("rulewidth").FirstOrDefault().Value);
VGap = double.Parse(fontXDoc.Descendants("vgap").FirstOrDefault().Value);
StdHw = DoubleOrNull(fontXDoc.Descendants("stdhw").FirstOrDefault().Value);
StdVw = DoubleOrNull(fontXDoc.Descendants("stdvw").FirstOrDefault().Value);
UndelinePosition = DoubleOrNull(fontXDoc.Descendants("underlineposition").FirstOrDefault().Value);
UnderlineThickness = DoubleOrNull(fontXDoc.Descendants("underlinethickness").FirstOrDefault().Value);
ItalicAngle = DoubleOrNull(fontXDoc.Descendants("italicangle").FirstOrDefault().Value);
CharWidth = DoubleOrNull(fontXDoc.Descendants("charwidth").FirstOrDefault().Value);
AxisPosition = DoubleOrNull(fontXDoc.Descendants("axisposition").FirstOrDefault().Value);
CharData = fontXDoc.Descendants("char").Select(x => new KeyValuePair<int, CharMetric>(int.Parse(x.Element("charid").Value.Substring(2), NumberStyles.HexNumber),
new CharMetric()
{
GlyphName = x.Element("name").Value,
Width = double.Parse(x.Element("w").Value),
Codes = x.Descendants("charid").Select(z => int.Parse(z.Value.Substring(2), NumberStyles.HexNumber)).ToList(),
BBox = new double[]
{
double.Parse(x.Element("b").Element("xmin").Value),
double.Parse(x.Element("b").Element("ymin").Value),
double.Parse(x.Element("b").Element("xmax").Value),
double.Parse(x.Element("b").Element("ymax").Value)
}
})).ToDictionary(kvp => kvp.Key, kvp=> kvp.Value);
XElement mg = fontXDoc.Descendants("missingglyph").FirstOrDefault();
MissingGlyph = new CharMetric()
{
GlyphName = mg.Element("name").Value,
Width = double.Parse(mg.Element("w").Value),
Codes = mg.Descendants("charid").Select(x => int.Parse(x.Value)).ToList(),
BBox = new double[]
{
double.Parse(mg.Element("b").Element("xmin").Value),
double.Parse(mg.Element("b").Element("ymin").Value),
double.Parse(mg.Element("b").Element("xmax").Value),
double.Parse(mg.Element("b").Element("ymax").Value)
}
};
}
public object[] FindChar(int ch)
{
foreach (FontMetricRecord fd in FontPool())
{
if (fd.Metric.CharData.ContainsKey(ch))
{
CharMetric cm = fd.Metric.CharData[ch];
return(new object[] { cm, fd });
}
else
{
if (0 < ch && ch < 0xFFFF && MathDefaults.SpecialChars.ContainsKey(ch))
{
return(FindChar(MathDefaults.SpecialChars[ch])); //ToDo: Verify correct working
}
return(null); // new object[] { null, null };
}
}
return(null);// new object[] { null, null }; //ToDo: verify correct working
}
private void ReadFontMetrics()
{
SkipTo(0);
// TTF version
m_reader.ReadUInt32();
// Number of tables
int numTables = numTables = m_reader.ReadUInt16();
numTables = BitConverter.ToInt16(BitConverter.GetBytes(numTables), 1);
// searchRange
m_reader.ReadUInt16();
// entrySelector
m_reader.ReadUInt16();
// rangeShift
m_reader.ReadUInt16();
m_fontType = c_ttfAbbreviation;
for (int i = 0; i < numTables; i++)
{
string tag = Encoding.UTF8.GetString(BitConverter.GetBytes(m_reader.ReadUInt32()));
uint checksum = ReadUInt32Bytes();
uint offset = ReadUInt32Bytes();
uint length = ReadUInt32Bytes();
m_tables.Add(tag, new Tuple <uint, uint>(offset, length));
}
SwitchTables("head");
SkipTo(m_currentOffset + 12);
uint magic = ReadUInt32Bytes();
if (magic != 0x5F0F3CF5)
{
throw new Exception("Magic number in 'head' table does not match the spec");
}
Skip(2);
m_unitsPerEm = ReadUInt16Bytes();
m_eMScale = 1.0 / Convert.ToDouble(m_unitsPerEm);
Skip(16);
double xMin = ReadInt16Bytes() * m_eMScale;
double yMin = ReadInt16Bytes() * m_eMScale;
double xMax = ReadInt16Bytes() * m_eMScale;
double yMax = ReadInt16Bytes() * m_eMScale;
m_boundingBox = new double[] { xMin, yMin, xMax, yMax };
Skip(6);
m_indexToLocFormat = ReadInt16Bytes();
SwitchTables("maxp");
SkipTo(m_currentOffset);
Skip(4);
m_numGlyphs = ReadUInt16Bytes();
SwitchTables("name");
SkipTo(m_currentOffset);
Skip(2);
uint numRecords = ReadUInt16Bytes();
m_storageOffset = ReadUInt16Bytes() + m_currentOffset;
for (int i = 0; i < numRecords; i++)
{
uint platformId = ReadUInt16Bytes();
uint encodingId = ReadUInt16Bytes();
uint languageId = ReadUInt16Bytes();
uint nameId = ReadUInt16Bytes();
uint nameLength = ReadUInt16Bytes();
uint nameOffset = ReadUInt16Bytes();
if (platformId == 3 && encodingId == 1)
{
if (englishCodes.Contains(languageId) || !m_uniNames.ContainsKey(nameId))
{
m_uniNames[nameId] = new Tuple <uint, uint>(nameOffset, nameLength);
}
}
else if (platformId == 1 && encodingId == 0)
{
if (languageId == 0 || !m_macNames.ContainsKey(nameId))
{
m_macNames[nameId] = new Tuple <uint, uint>(nameOffset, nameLength);
}
}
}
m_family = GetName(1);
m_fullName = GetName(4);
m_fontName = GetName(6);
SwitchTables("OS/2");
SkipTo(m_currentOffset);
uint tableVersion = ReadUInt16Bytes();
int os2_xAvgCharWidth = ReadInt16Bytes();
if (os2_xAvgCharWidth > 0)
{
m_charWidth = os2_xAvgCharWidth * EmScale;
}
uint wght = ReadUInt16Bytes();
if (wght < 150)
{
m_weight = "Thin";
}
else if (wght < 250)
{
m_weight = "Extra-Light";
}
else if (wght < 350)
{
m_weight = "Light";
}
else if (wght < 450)
{
m_weight = "Regular";
}
else if (wght < 550)
{
m_weight = "Medium";
}
else if (wght < 650)
{
m_weight = "Demi-Bold";
}
else if (wght < 750)
{
m_weight = "Bold";
}
else if (wght < 850)
{
m_weight = "Extra-Bold";
}
else
{
m_weight = "Black";
}
Skip(62);
m_ascender = ReadInt16Bytes() * EmScale;
m_descender = ReadInt16Bytes() * EmScale;
if (tableVersion == 2)
{
Skip(14);
int xh = ReadInt16Bytes();
if (xh > 0)
{
m_xHeight = xh * EmScale;
}
int ch = ReadInt16Bytes();
if (ch > 0)
{
m_capHeight = ch * EmScale;
}
}
SwitchTables("post");
SkipTo(m_currentOffset);
Skip(4);
m_italicAngle = Convert.ToDouble(ReadFixed32());
m_undelinePosition = ReadInt16Bytes() * EmScale;
m_underlineThickness = ReadInt16Bytes() * EmScale;
SwitchTables("hhea");
SkipTo(m_currentOffset);
Skip(34);
uint numHmtx = ReadUInt16Bytes();
SwitchTables("hmtx");
SkipTo(m_currentOffset);
List <CharMetric> glyphArray = new List <CharMetric>();
double w = 0;
for (int i = 0; i < m_numGlyphs; i++)
{
if (i < numHmtx)
{
w = ReadUInt16Bytes() * EmScale;
Skip(2);
}
glyphArray.Add(new CharMetric(w));
}
SwitchTables("cmap");
SkipTo(m_currentOffset);
Skip(2);
Dictionary <Tuple <uint, uint>, uint> cmapEncodings = new Dictionary <Tuple <uint, uint>, uint>();
uint numSubTables = ReadUInt16Bytes();
for (int i = 0; i < numSubTables; i++)
{
uint platformId = ReadUInt16Bytes();
uint encodingId = ReadUInt16Bytes();
uint subTableoffset = ReadUInt32Bytes();
cmapEncodings.Add(new Tuple <uint, uint>(platformId, encodingId), subTableoffset);
}
string encodingScheme = "Unicode";
uint subtableOffset;
Tuple <uint, uint> preferedSubTable = new Tuple <uint, uint>(3, 1);
Tuple <uint, uint> symbolSubTable = new Tuple <uint, uint>(3, 0);
if (!cmapEncodings.ContainsKey(preferedSubTable))
{
if (!cmapEncodings.ContainsKey(symbolSubTable))
{
throw new NotSupportedException(string.Format("Cannot use font {0}: no known subtable in 'cmap' table", m_fontName));
}
encodingScheme = "Symbol";
subtableOffset = cmapEncodings[symbolSubTable];
}
else
{
subtableOffset = cmapEncodings[preferedSubTable];
}
SkipTo(m_currentOffset + subtableOffset);
uint subTableFormat = ReadUInt16Bytes();
if (subTableFormat != 4)
{
throw new NotSupportedException(string.Format("Unsupported format in 'cmap' table: {0}", subtableOffset));
}
uint subtableLength = ReadUInt16Bytes();
Skip(2);
uint segCount = ReadUInt16Bytes() / 2;
Skip(6);
List <uint> endCounts = Enumerable.Range(0, (int)segCount).Select(x => ReadUInt16Bytes()).ToList();
Skip(2);
List <uint> startCounts = Enumerable.Range(0, (int)segCount).Select(x => ReadUInt16Bytes()).ToList();
List <int> idDeltas = Enumerable.Range(0, (int)segCount).Select(x => ReadInt16Bytes()).ToList();
List <uint> rangeOffsets = Enumerable.Range(0, (int)segCount).Select(x => ReadUInt16Bytes()).ToList();
uint remainingLength = subtableLength - (8 * segCount) - 16;
if (remainingLength <= 0)
{
remainingLength += 0x10000;
}
List <uint> glyphIdArray = Enumerable.Range(0, (int)remainingLength / 2).Select(x => ReadUInt16Bytes()).ToList();
for (int i = 0; i < segCount; i++)
{
for (uint c = startCounts[i]; c < endCounts[i] + 1; c++)
{
if (c == 0xFFFF)
{
continue;
}
uint gid;
if (rangeOffsets[i] > 0)
{
uint idx = (c - startCounts[i]) + (rangeOffsets[i] / 2) - (segCount - (uint)i);
gid = glyphIdArray[(int)idx];
}
else
{
gid = c + ((uint)idDeltas[i]);
}
if (gid >= 0x10000)
{
gid -= 0x10000;
}
else if (gid < 0)
{
gid += 0x10000;
}
CharMetric cm = glyphArray[(int)gid];
cm.Codes.Add(c);
if (encodingScheme == "Symbol" && (0xF020 <= c && c <= 0xF07F))
{
cm.Codes.Add(c - 0xF000);
}
if (string.IsNullOrEmpty(cm.GlyphName))
{
cm.GlyphName = string.Format("u{0:X4}", c);
}
}
}
SwitchTables("loca");
SkipTo(m_currentOffset);
List <uint> glyphIndex = new List <uint>();
int scalefactor = m_indexToLocFormat + 1;
if (m_indexToLocFormat == 0)
{
glyphIndex.AddRange(Enumerable.Range(0, (int)m_numGlyphs + 1).Select(x => ReadUInt16Bytes() * 2));
}
else if (m_indexToLocFormat == 1)
{
glyphIndex.AddRange(Enumerable.Range(0, (int)m_numGlyphs + 1).Select(x => ReadUInt32Bytes()));
}
else
{
throw new InvalidDataException(string.Format("Invalid indexToLocFormat value ({0}) in 'head' table", m_indexToLocFormat));
}
SwitchTables("glyf");
for (int i = 0; i < m_numGlyphs; i++)
{
CharMetric cm = glyphArray[i];
if (glyphIndex[i] == glyphIndex[i + 1])
{
cm.SetBBox(0, 0, 0, 0); // empty glyph
}
else
{
SkipTo(m_currentOffset + glyphIndex[i] + 2);
double xMinc = ReadInt16Bytes() * EmScale;
double yMinc = ReadInt16Bytes() * EmScale;
double xMaxc = ReadInt16Bytes() * EmScale;
double yMaxc = ReadInt16Bytes() * EmScale;
cm.SetBBox(xMinc, yMinc, xMaxc, yMaxc);
}
cm.Codes.ForEach(x =>
{
CharMetric ccm = new CharMetric(
charName: cm.GlyphName,
codes: cm.Codes.Select(y => (uint)y).ToList(),
width: cm.Width,
bbox: cm.BBox);
CharData.Add((int)x, ccm);
});
}
}
public void MeasureText()
{
if (Text.Length == 0)
{
IsSpace = true;
return;
}
CharMetric cm0 = null;
CharMetric cm1 = null;
CharMetric cm = null;
int[] ucstext = GetUCSText();
foreach (int chcode in ucstext)
{
object[] chardesc = FindChar(chcode);
if (chardesc == null)
{
Width += Metric().MissingGlyph.Width;
}
else
{
cm = (CharMetric)chardesc[0];
FontMetricRecord fd = (FontMetricRecord)chardesc[1];
fd.Used = true;
if (chcode == ucstext.First()) //ToDo: Verify correct translation
{
cm0 = cm;
}
if (chcode == ucstext.Last()) //ToDo: Verify correct translation
{
cm1 = cm;
}
Width += cm.Width;
if (Height + Depth == 0)
{
Height = cm.BBox[3];
Depth = -(cm.BBox[1]);
}
else if (cm.BBox[3] != cm.BBox[1])
{
Height = Math.Max(Height, cm.BBox[3]);
Depth = Math.Max(Depth, -(cm.BBox[1]));
}
}
}
// Normalize to the font size
Width *= FontSize;
Depth *= FontSize;
Height *= FontSize;
// Add ascender/ descender values
Ascender = NominalAscender();
Descender = NominalDescender();
// Shape correction
if (cm0 != null)
{
LeftBearing = Math.Max(0, -cm0.BBox[0]) * FontSize;
}
if (cm1 != null)
{
RightBearing = Math.Max(0, cm1.BBox[2] - cm.Width) * FontSize;
}
Width += LeftBearing + RightBearing;
//Reset nominal metric
NominalMetric = null;
}
