public IGlyphDescription Merge(IGlyphDescription glyph)
{
var newPoints = MergePoints(glyph);
var newEndpoints = MergeContourEndPoints(glyph);
return(new Glyph(false, Instructions, newEndpoints, newPoints, Bounds));
}
public static GlyphDataTable Load(TrueTypeDataBytes data, TrueTypeHeaderTable table, TableRegister.Builder tableRegister)
{
data.Seek(table.Offset);
var indexToLocationTable = tableRegister.IndexToLocationTable;
var offsets = indexToLocationTable.GlyphOffsets;
var entryCount = offsets.Length;
var glyphCount = entryCount - 1;
var glyphs = new IGlyphDescription[glyphCount];
var emptyGlyph = Glyph.Empty(tableRegister.HeaderTable.Bounds);
var compositeLocations = new Dictionary <int, TemporaryCompositeLocation>();
for (var i = 0; i < glyphCount; i++)
{
if (offsets[i] == offsets[i + 1])
{
// empty glyph
glyphs[i] = emptyGlyph;
continue;
}
data.Seek(offsets[i] + table.Offset);
var contourCount = data.ReadSignedShort();
var minX = data.ReadSignedShort();
var minY = data.ReadSignedShort();
var maxX = data.ReadSignedShort();
var maxY = data.ReadSignedShort();
var bounds = new PdfRectangle(minX, minY, maxX, maxY);
// If the number of contours is greater than or equal zero it's a simple glyph.
if (contourCount >= 0)
{
glyphs[i] = ReadSimpleGlyph(data, contourCount, bounds);
}
else
{
compositeLocations.Add(i, new TemporaryCompositeLocation(data.Position, bounds, contourCount));
}
}
// Build composite glyphs by combining simple and other composite glyphs.
foreach (var compositeLocation in compositeLocations)
{
glyphs[compositeLocation.Key] = ReadCompositeGlyph(data, compositeLocation.Value, compositeLocations, glyphs, emptyGlyph);
}
return(new GlyphDataTable(table, glyphs));
}
private IReadOnlyList <IGlyphDescription> ReadGlyphs()
{
var data = tableBytes;
var offsets = glyphOffsets;
var entryCount = offsets.Count;
var glyphCount = entryCount - 1;
var result = new IGlyphDescription[glyphCount];
var emptyGlyph = Glyph.Empty(maxGlyphBounds);
var compositeLocations = new Dictionary <int, TemporaryCompositeLocation>();
for (var i = 0; i < glyphCount; i++)
{
if (offsets[i + 1] <= offsets[i])
{
// empty glyph
result[i] = emptyGlyph;
continue;
}
data.Seek(offsets[i]);
var contourCount = data.ReadSignedShort();
var minX = data.ReadSignedShort();
var minY = data.ReadSignedShort();
var maxX = data.ReadSignedShort();
var maxY = data.ReadSignedShort();
var bounds = new PdfRectangle(minX, minY, maxX, maxY);
// If the number of contours is greater than or equal zero it's a simple glyph.
if (contourCount >= 0)
{
result[i] = ReadSimpleGlyph(data, contourCount, bounds);
}
else
{
compositeLocations.Add(i, new TemporaryCompositeLocation(data.Position, bounds, contourCount));
}
}
// Build composite glyphs by combining simple and other composite glyphs.
foreach (var compositeLocation in compositeLocations)
{
result[compositeLocation.Key] = ReadCompositeGlyph(data, compositeLocation.Value, compositeLocations, result, emptyGlyph);
}
return(result);
}
private GlyphPoint[] MergePoints(IGlyphDescription glyph)
{
var newPoints = new GlyphPoint[Points.Length + glyph.Points.Length];
for (int i = 0; i < Points.Length; i++)
{
newPoints[i] = Points[i];
}
for (int i = 0; i < glyph.Points.Length; i++)
{
newPoints[i + Points.Length] = glyph.Points[i];
}
return(newPoints);
}
public static GlyphDataTable Load(TrueTypeDataBytes data, TrueTypeHeaderTable table, TableRegister tableRegister)
{
data.Seek(table.Offset);
var headerTable = tableRegister.HeaderTable;
var indexToLocationTable = tableRegister.IndexToLocationTable;
var offsets = indexToLocationTable.GlyphOffsets;
var entryCount = offsets.Length;
var glyphCount = entryCount - 1;
var glyphs = new IGlyphDescription[glyphCount];
for (var i = 0; i < glyphCount; i++)
{
if (offsets[i] == offsets[i + 1])
{
// empty glyph
continue;
}
data.Seek(offsets[i] + table.Offset);
var contourCount = data.ReadSignedShort();
var minX = data.ReadSignedShort();
var minY = data.ReadSignedShort();
var maxX = data.ReadSignedShort();
var maxY = data.ReadSignedShort();
var bounds = new PdfRectangle(minX, minY, maxX, maxY);
// If the number of contours is greater than or equal zero it's a simple glyph.
if (contourCount >= 0)
{
glyphs[i] = ReadSimpleGlyph(data, contourCount, bounds);
}
else
{
}
}
return(new GlyphDataTable(table, glyphs));
}
private int[] MergeContourEndPoints(IGlyphDescription glyph)
{
var destinationLastEndPoint = EndPointsOfContours[EndPointsOfContours.Length - 1] + 1;
var endPoints = new int[EndPointsOfContours.Length + glyph.EndPointsOfContours.Length];
for (var i = 0; i < EndPointsOfContours.Length; i++)
{
endPoints[i] = EndPointsOfContours[i];
}
for (var i = 0; i < glyph.EndPointsOfContours.Length; i++)
{
endPoints[i + EndPointsOfContours.Length] = glyph.EndPointsOfContours[i] + destinationLastEndPoint;
}
return(endPoints);
}
/**
* Set the points of a glyph from the GlyphDescription.
*/
private Point[] Describe(IGlyphDescription gd)
{
int endPtIndex = 0;
int endPtOfContourIndex = -1;
Point[] points = new Point[gd.PointCount];
for (int i = 0; i < gd.PointCount; i++)
{
if (endPtOfContourIndex == -1)
{
endPtOfContourIndex = gd.GetEndPtOfContours(endPtIndex);
}
bool endPt = endPtOfContourIndex == i;
if (endPt)
{
endPtIndex++;
endPtOfContourIndex = -1;
}
points[i] = new Point(gd.GetXCoordinate(i), gd.GetYCoordinate(i),
(gd.GetFlags(i) & GlyfDescript.ON_CURVE) != 0, endPt);
}
return(points);
}
private static IGlyphDescription ReadCompositeGlyph(TrueTypeDataBytes data, TemporaryCompositeLocation compositeLocation, Dictionary <int, TemporaryCompositeLocation> compositeLocations, IGlyphDescription[] glyphs,
IGlyphDescription emptyGlyph)
{
bool HasFlag(CompositeGlyphFlags value, CompositeGlyphFlags target)
{
return((value & target) == target);
}
data.Seek(compositeLocation.Position);
var components = new List <CompositeComponent>();
// First recursively find all components and ensure they are available.
CompositeGlyphFlags flags;
do
{
flags = (CompositeGlyphFlags)data.ReadUnsignedShort();
var glyphIndex = data.ReadUnsignedShort();
var childGlyph = glyphs[glyphIndex];
if (childGlyph == null)
{
if (!compositeLocations.TryGetValue(glyphIndex, out var missingComposite))
{
throw new InvalidOperationException($"The composite glyph required a contour at index {glyphIndex} but there was no simple or composite glyph at this location.");
}
var position = data.Position;
childGlyph = ReadCompositeGlyph(data, missingComposite, compositeLocations, glyphs, emptyGlyph);
data.Seek(position);
glyphs[glyphIndex] = childGlyph;
}
short arg1, arg2;
if (HasFlag(flags, CompositeGlyphFlags.Args1And2AreWords))
{
arg1 = data.ReadSignedShort();
arg2 = data.ReadSignedShort();
}
else
{
arg1 = data.ReadByte();
arg2 = data.ReadByte();
}
decimal xscale = 1;
decimal scale01 = 0;
decimal scale10 = 0;
decimal yscale = 1;
if (HasFlag(flags, CompositeGlyphFlags.WeHaveAScale))
{
xscale = ReadTwoFourteenFormat(data);
yscale = xscale;
}
else if (HasFlag(flags, CompositeGlyphFlags.WeHaveAnXAndYScale))
{
xscale = ReadTwoFourteenFormat(data);
yscale = ReadTwoFourteenFormat(data);
}
else if (HasFlag(flags, CompositeGlyphFlags.WeHaveATwoByTwo))
{
xscale = ReadTwoFourteenFormat(data);
scale01 = ReadTwoFourteenFormat(data);
scale10 = ReadTwoFourteenFormat(data);
yscale = ReadTwoFourteenFormat(data);
}
if (HasFlag(flags, CompositeGlyphFlags.ArgsAreXAndYValues))
{
components.Add(new CompositeComponent(glyphIndex, new PdfMatrix3By2(xscale, scale01, scale10, yscale, arg1, arg2)));
}
else
{
// TODO: Not implemented, it is unclear how to do this.
}
} while (HasFlag(flags, CompositeGlyphFlags.MoreComponents));
// Now build the final glyph from the components.
IGlyphDescription builderGlyph = null;
foreach (var component in components)
{
var glyph = glyphs[component.Index];
var transformed = glyph.Transform(component.Transformation);
if (builderGlyph == null)
{
builderGlyph = transformed;
}
else
{
builderGlyph = builderGlyph.Merge(transformed);
}
}
builderGlyph = builderGlyph ?? emptyGlyph;
return(new Glyph(false, builderGlyph.Instructions, builderGlyph.EndPointsOfContours, builderGlyph.Points, compositeLocation.Bounds));
}
public GlyphRenderer(IGlyphDescription glyphDescription)
{
this.glyphDescription = glyphDescription;
}
