/// <summary>
/// Draw glyph run to the drawing surface
/// </summary>
internal sealed override void Draw(
DrawingContext drawingContext,
Brush foregroundBrush,
GlyphRun glyphRun
)
{
if (drawingContext == null)
{
throw new ArgumentNullException("drawingContext");
}
glyphRun.EmitBackground(drawingContext, _properties.BackgroundBrush);
drawingContext.DrawGlyphRun(
foregroundBrush != null ? foregroundBrush : _properties.ForegroundBrush,
glyphRun
);
}
/// <summary>
/// Draw all formatted glyphruns
/// </summary>
/// <returns>drawing bounding box</returns>
public Rect Draw(
DrawingContext drawingContext,
Point currentOrigin
)
{
Rect inkBoundingBox = Rect.Empty;
Debug.Assert(_glyphs != null);
foreach (Glyphs glyphs in _glyphs)
{
GlyphRun glyphRun = glyphs.CreateGlyphRun(currentOrigin, _rightToLeft);
Rect boundingBox;
if (glyphRun != null)
{
boundingBox = glyphRun.ComputeInkBoundingBox();
if (drawingContext != null)
{
// Emit glyph run background.
glyphRun.EmitBackground(drawingContext, glyphs.BackgroundBrush);
drawingContext.PushGuidelineY1(currentOrigin.Y);
try
{
drawingContext.DrawGlyphRun(glyphs.ForegroundBrush, glyphRun);
}
finally
{
drawingContext.Pop();
}
}
}
else
{
boundingBox = Rect.Empty;
}
if (!boundingBox.IsEmpty)
{
// glyph run's ink bounding box is relative to its origin
boundingBox.X += glyphRun.BaselineOrigin.X;
boundingBox.Y += glyphRun.BaselineOrigin.Y;
}
// accumulate overall ink bounding box
inkBoundingBox.Union(boundingBox);
if (_rightToLeft)
{
currentOrigin.X -= glyphs.Width;
}
else
{
currentOrigin.X += glyphs.Width;
}
}
return(inkBoundingBox);
}
