public TextBoxContext MapPoint(Graphics g, PointF pt, out bool atEndOfLine)
{
TextBoxContext textBoxContext = null;
atEndOfLine = false;
TextRun textRun = default(TextRun);
int iX = default(int);
textBoxContext = this.GetParagraphAndRunIndex(g, (int)pt.X, (int)pt.Y, out textRun, out iX, out atEndOfLine);
if (textRun != null)
{
GlyphData glyphData = textRun.GlyphData;
GlyphShapeData glyphScriptShapeData = glyphData.GlyphScriptShapeData;
if (glyphData != null && textRun.CharacterCount > 0)
{
int num = 0;
int num2 = 0;
int num3 = Win32.ScriptXtoCP(iX, textRun.CharacterCount, glyphScriptShapeData.GlyphCount, glyphScriptShapeData.Clusters, glyphScriptShapeData.VisAttrs, glyphData.Advances, ref textRun.SCRIPT_ANALYSIS, ref num, ref num2);
if (Win32.Failed(num3))
{
Marshal.ThrowExceptionForHR(num3);
}
if (textRun.ScriptAnalysis.fLayoutRTL == 1)
{
if (num == -1)
{
textBoxContext.TextRunCharacterIndex += textRun.CharacterCount;
}
else if (pt.X <= 0.0)
{
TextBoxContext textBoxContext2 = textBoxContext;
textBoxContext2.TextRunCharacterIndex = textBoxContext2.TextRunCharacterIndex;
}
else
{
textBoxContext.TextRunCharacterIndex += num + num2;
}
}
else
{
textBoxContext.TextRunCharacterIndex += num + num2;
}
}
}
if (textBoxContext == null)
{
textBoxContext = new TextBoxContext();
}
return(textBoxContext);
}
