// ------------------------------------------------------------------------------
// Parses a semicolon-delimited list of glyph specifiers, each of which consists
// of up to 4 comma-delimited values:
// - glyph index (ushort)
// - glyph advance (double)
// - glyph offset X (double)
// - glyph offset Y (double)
// A glyph entry can be have a cluster size prefix (int or pair of ints separated by a colon)
// Whitespace adjacent to a delimiter (comma or semicolon) is ignored.
// Returns the number of glyph specs parsed (number of semicolons plus 1).
//
private int ParseGlyphsProperty(
GlyphTypeface fontFace,
string unicodeString,
bool sideways,
out List<ParsedGlyphData> parsedGlyphs,
out ushort[] clusterMap)
{
string glyphsProp = Indices;
// init for the whole parse, including the result arrays
int parsedGlyphCount = 0;
int parsedCharacterCount = 0;
int characterClusterSize = 1;
int glyphClusterSize = 1;
bool inCluster = false;
// make reasonable capacity guess on how many glyphs we can expect
int estimatedNumberOfGlyphs;
if (!String.IsNullOrEmpty(unicodeString))
{
clusterMap = new ushort[unicodeString.Length];
estimatedNumberOfGlyphs = unicodeString.Length;
}
else
{
clusterMap = null;
estimatedNumberOfGlyphs = 8;
}
if (!String.IsNullOrEmpty(glyphsProp))
estimatedNumberOfGlyphs = Math.Max(estimatedNumberOfGlyphs, glyphsProp.Length / 5);
parsedGlyphs = new List<ParsedGlyphData>(estimatedNumberOfGlyphs);
ParsedGlyphData parsedGlyphData = new ParsedGlyphData();
#region Parse Glyphs string
if (!String.IsNullOrEmpty(glyphsProp))
{
// init per-glyph values for the first glyph/position
int valueWithinGlyph = 0; // which value we're on (how many commas have we seen in this glyph)?
int valueStartIndex = 0; // where (what index of Glyphs prop string) did this value start?
// iterate and parse the characters of the Indices property
for (int i = 0; i <= glyphsProp.Length; i++)
{
// get next char or pseudo-terminator
char c = i < glyphsProp.Length ? glyphsProp[i] : '\0';
// finished scanning the current per-glyph value?
if ((c == ',') || (c == ';') || (i == glyphsProp.Length))
{
int len = i - valueStartIndex;
string valueSpec = glyphsProp.Substring(valueStartIndex, len);
#region Interpret one comma-delimited value
switch (valueWithinGlyph)
{
case 0:
bool wasInCluster = inCluster;
// interpret cluster size and glyph index spec
if (!ReadGlyphIndex(
valueSpec,
ref inCluster,
ref glyphClusterSize,
ref characterClusterSize,
ref parsedGlyphData.glyphIndex))
{
if (String.IsNullOrEmpty(unicodeString))
throw new ArgumentException(SR.Get(SRID.GlyphsIndexRequiredIfNoUnicode));
if (unicodeString.Length <= parsedCharacterCount)
throw new ArgumentException(SR.Get(SRID.GlyphsUnicodeStringIsTooShort));
parsedGlyphData.glyphIndex = GetGlyphFromCharacter(fontFace, unicodeString[parsedCharacterCount]);
}
if (!wasInCluster && clusterMap != null)
{
// fill out cluster map at the start of each cluster
if (inCluster)
{
for (int ch = parsedCharacterCount; ch < parsedCharacterCount + characterClusterSize; ++ch)
{
SetClusterMapEntry(clusterMap, ch, (ushort)parsedGlyphCount);
}
}
else
{
SetClusterMapEntry(clusterMap, parsedCharacterCount, (ushort)parsedGlyphCount);
}
}
parsedGlyphData.advanceWidth = GetAdvanceWidth(fontFace, parsedGlyphData.glyphIndex, sideways);
break;
case 1:
// interpret glyph advance spec
if (!IsEmpty(valueSpec))
{
parsedGlyphData.advanceWidth = double.Parse(valueSpec, CultureInfo.InvariantCulture);
if (parsedGlyphData.advanceWidth < 0)
throw new ArgumentException(SR.Get(SRID.GlyphsAdvanceWidthCannotBeNegative));
}
break;
case 2:
// interpret glyph offset X
if (!IsEmpty(valueSpec))
parsedGlyphData.offsetX = double.Parse(valueSpec, CultureInfo.InvariantCulture);
break;
case 3:
// interpret glyph offset Y
if (!IsEmpty(valueSpec))
parsedGlyphData.offsetY = double.Parse(valueSpec, CultureInfo.InvariantCulture);
break;
default:
// too many commas; can't interpret
throw new ArgumentException(SR.Get(SRID.GlyphsTooManyCommas));
}
#endregion Interpret one comma-delimited value
// prepare to scan next value (if any)
valueWithinGlyph++;
valueStartIndex = i + 1;
}
// finished processing the current glyph?
if ((c == ';') || (i == glyphsProp.Length))
{
parsedGlyphs.Add(parsedGlyphData);
parsedGlyphData = new ParsedGlyphData();
if (inCluster)
{
--glyphClusterSize;
// when we reach the end of a glyph cluster, increment character index
if (glyphClusterSize == 0)
{
parsedCharacterCount += characterClusterSize;
inCluster = false;
}
}
else
{
++parsedCharacterCount;
}
parsedGlyphCount++;
// initalize new per-glyph values
valueWithinGlyph = 0; // which value we're on (how many commas have we seen in this glyph)?
valueStartIndex = i + 1; // where (what index of Glyphs prop string) did this value start?
}
}
}
#endregion
// fill the remaining glyphs with defaults, assuming 1:1 mapping
if (unicodeString != null)
{
while (parsedCharacterCount < unicodeString.Length)
{
if (inCluster)
throw new ArgumentException(SR.Get(SRID.GlyphsIndexRequiredWithinCluster));
if (unicodeString.Length <= parsedCharacterCount)
throw new ArgumentException(SR.Get(SRID.GlyphsUnicodeStringIsTooShort));
parsedGlyphData.glyphIndex = GetGlyphFromCharacter(fontFace, unicodeString[parsedCharacterCount]);
parsedGlyphData.advanceWidth = GetAdvanceWidth(fontFace, parsedGlyphData.glyphIndex, sideways);
parsedGlyphs.Add(parsedGlyphData);
parsedGlyphData = new ParsedGlyphData();
SetClusterMapEntry(clusterMap, parsedCharacterCount, (ushort)parsedGlyphCount);
++parsedCharacterCount;
++parsedGlyphCount;
}
}
// return number of glyphs actually specified
return parsedGlyphCount;
}
// ------------------------------------------------------------------------------------------------
// Parses a semicolon-delimited list of glyph specifiers, each of which consists
// of up to 4 comma-delimited values:
// - glyph index (ushort)
// - glyph advance (double)
// - glyph offset X (double)
// - glyph offset Y (double)
// A glyph entry can be have a cluster size prefix (int or pair of ints separated by a colon)
// Whitespace adjacent to a delimiter (comma or semicolon) is ignored.
// Returns the number of glyph specs parsed (number of semicolons plus 1).
// ------------------------------------------------------------------------------------------------
private int ParseGlyphsProperty(GlyphTypeface fontFace, string unicodeString, bool sideways,
out List <ParsedGlyphData> parsedGlyphs, out ushort[] clusterMap)
{
string glyphsProp = string.Empty;
// init for the whole parse, including the result arrays
int parsedGlyphCount = 0;
int parsedCharacterCount = 0;
int characterClusterSize = 1;
int glyphClusterSize = 1;
bool inCluster = false;
// make reasonable capacity guess on how many glyphs we can expect
int estimatedNumberOfGlyphs;
if (!string.IsNullOrEmpty(unicodeString))
{
clusterMap = new ushort[unicodeString.Length];
estimatedNumberOfGlyphs = unicodeString.Length;
}
else
{
clusterMap = null;
estimatedNumberOfGlyphs = 8;
}
if (!string.IsNullOrEmpty(glyphsProp))
{
estimatedNumberOfGlyphs = Math.Max(estimatedNumberOfGlyphs, glyphsProp.Length / 5);
}
parsedGlyphs = new List <ParsedGlyphData>(estimatedNumberOfGlyphs);
ParsedGlyphData parsedGlyphData = new ParsedGlyphData();
if (!string.IsNullOrEmpty(glyphsProp))
{
// init per-glyph values for the first glyph/position
int valueWithinGlyph = 0; // which value we're on (how many commas have we seen in this glyph)?
int valueStartIndex = 0; // where (what index of Glyphs prop string) did this value start?
// iterate and parse the characters of the Indices property
for (int i = 0; i <= glyphsProp.Length; i++)
{
// get next char or pseudo-terminator
char c = i < glyphsProp.Length ? glyphsProp[i] : '\0';
// finished scanning the current per-glyph value?
if ((c == ',') || (c == ';') || (i == glyphsProp.Length))
{
int len = i - valueStartIndex;
string valueSpec = glyphsProp.Substring(valueStartIndex, len);
switch (valueWithinGlyph)
{
case 0:
bool wasInCluster = inCluster;
// interpret cluster size and glyph index spec
if (!ReadGlyphIndex(valueSpec, ref inCluster, ref glyphClusterSize,
ref characterClusterSize, ref parsedGlyphData.glyphIndex))
{
if (string.IsNullOrEmpty(unicodeString))
{
throw new ArgumentException();
}
if (unicodeString.Length <= parsedCharacterCount)
{
throw new ArgumentException();
}
parsedGlyphData.glyphIndex = GetGlyphFromCharacter(fontFace, unicodeString[parsedCharacterCount]);
}
if (!wasInCluster && clusterMap != null)
{
// fill out cluster map at the start of each cluster
if (inCluster)
{
for (int ch = parsedCharacterCount; ch < parsedCharacterCount + characterClusterSize; ++ch)
{
SetClusterMapEntry(clusterMap, ch, (ushort)parsedGlyphCount);
}
}
else
{
SetClusterMapEntry(clusterMap, parsedCharacterCount, (ushort)parsedGlyphCount);
}
}
parsedGlyphData.advanceWidth = GetAdvanceWidth(fontFace, parsedGlyphData.glyphIndex, sideways);
break;
case 1:
// interpret glyph advance spec
if (!IsEmpty(valueSpec))
{
parsedGlyphData.advanceWidth = double.Parse(valueSpec, CultureInfo.InvariantCulture);
if (parsedGlyphData.advanceWidth < 0)
{
throw new ArgumentException();
}
}
break;
case 2:
// interpret glyph offset X
if (!IsEmpty(valueSpec))
{
parsedGlyphData.offsetX = double.Parse(valueSpec, CultureInfo.InvariantCulture);
}
break;
case 3:
// interpret glyph offset Y
if (!IsEmpty(valueSpec))
{
parsedGlyphData.offsetY = double.Parse(valueSpec, CultureInfo.InvariantCulture);
}
break;
default:
// too many commas; can't interpret
throw new ArgumentException();
}
// prepare to scan next value (if any)
valueWithinGlyph++;
valueStartIndex = i + 1;
}
// finished processing the current glyph?
if ((c == ';') || (i == glyphsProp.Length))
{
parsedGlyphs.Add(parsedGlyphData);
parsedGlyphData = new ParsedGlyphData();
if (inCluster)
{
--glyphClusterSize;
// when we reach the end of a glyph cluster, increment character index
if (glyphClusterSize == 0)
{
parsedCharacterCount += characterClusterSize;
inCluster = false;
}
}
else
{
++parsedCharacterCount;
}
parsedGlyphCount++;
// initalize new per-glyph values
valueWithinGlyph = 0; // which value we're on (how many commas have we seen in this glyph)?
valueStartIndex = i + 1; // where (what index of Glyphs prop string) did this value start?
}
}
}
// fill the remaining glyphs with defaults, assuming 1:1 mapping
if (unicodeString != null)
{
while (parsedCharacterCount < unicodeString.Length)
{
if (inCluster)
{
throw new ArgumentException();
}
if (unicodeString.Length <= parsedCharacterCount)
{
throw new ArgumentException();
}
parsedGlyphData.glyphIndex = GetGlyphFromCharacter(fontFace, unicodeString[parsedCharacterCount]);
parsedGlyphData.advanceWidth = GetAdvanceWidth(fontFace, parsedGlyphData.glyphIndex, sideways);
parsedGlyphs.Add(parsedGlyphData);
parsedGlyphData = new ParsedGlyphData();
SetClusterMapEntry(clusterMap, parsedCharacterCount, (ushort)parsedGlyphCount);
++parsedCharacterCount;
++parsedGlyphCount;
}
}
// return number of glyphs actually specified
return(parsedGlyphCount);
}
