private void DrawRenderLine(DrawingContext drawingContext, StringTextRenderLine bufferRenderLine)
{
if (bufferRenderLine.Data == null)
{
return;
}
var fontSize = FontSize;
var startPosition = bufferRenderLine.StartPosition;
startPosition.Y += GlyphTypeface.AdvanceHeights[0] * fontSize + CellMargin.Top + CellPadding.Top;
var glyphIndexes = new ushort[bufferRenderLine.Data.Length * 3];
var advanceWidths = new double[bufferRenderLine.Data.Length * 3];
for (int i = 0; i < bufferRenderLine.Data.Length; i++)
{
GlyphTypeface.CharacterToGlyphMap.TryGetValue(' ', out glyphIndexes[3 * i]);
GlyphTypeface.CharacterToGlyphMap.TryGetValue(bufferRenderLine.Data[i], out glyphIndexes[3 * i + 1]);
GlyphTypeface.CharacterToGlyphMap.TryGetValue(' ', out glyphIndexes[3 * i + 2]);
advanceWidths[3 * i] = CellMargin.Left + CellPadding.Right;
advanceWidths[3 * i + 1] = CharSize.Width;
advanceWidths[3 * i + 2] = CellPadding.Right + CellMargin.Right;
}
#if NET47
var glyph = new GlyphRun(GlyphTypeface, 0, false, fontSize, (float)PixelPerDip, glyphIndexes, startPosition, advanceWidths, null, null, null, null, null, null);
#endif
#if NET451
var glyph = new GlyphRun(GlyphTypeface, 0, false, fontSize, glyphIndexes, startPosition, advanceWidths, null, null, null, null, null, null);
#endif
drawingContext.DrawGlyphRun(bufferRenderLine.Foreground, glyph);
}
private IEnumerable <StringTextRenderLine> GetRenderLines()
{
if (BytesToCharEncoding == null)
{
yield break;
}
if (Data == null)
{
yield break;
}
var data = Data;
var bytesToCharEncoding = BytesToCharEncoding;
var bytePerLine = BytePerLine;
var foreground = Foreground;
var foregroundBlocks = ForegroundBlocks;
var fontSize = FontSize;
var cellSize = GetCellSize();
var firstVisibleBtIndex = (int)(bytesToCharEncoding.BytePerChar - PositionStartToShow % bytesToCharEncoding.BytePerChar) % bytesToCharEncoding.BytePerChar;
var charCount = (data.Length - firstVisibleBtIndex) / bytesToCharEncoding.BytePerChar;
var row = -1;
StringTextRenderLine lastRenderLine = default;
var lineReturned = false;
var charList = new List <char>();
if (_drawCharBuffer == null || _drawCharBuffer.Length != bytesToCharEncoding.BytePerChar)
{
_drawCharBuffer = new byte[bytesToCharEncoding.BytePerChar];
}
for (int chIndex = 0; chIndex < charCount; chIndex++)
{
var btIndex = bytesToCharEncoding.BytePerChar * chIndex;
var thisCol = btIndex % bytePerLine;
var thisRow = btIndex / bytePerLine;
var thisForeground = foreground;
//Refresh foreground;
if (foregroundBlocks != null)
{
foreach (var brushBlock in foregroundBlocks)
{
if (brushBlock.StartOffset <= btIndex && brushBlock.StartOffset + brushBlock.Length - 1 >= btIndex)
{
thisForeground = brushBlock.Brush;
}
}
}
Buffer.BlockCopy(data, btIndex + firstVisibleBtIndex, _drawCharBuffer, 0, bytesToCharEncoding.BytePerChar);
var ch = bytesToCharEncoding.ConvertToChar(_drawCharBuffer);
if (thisRow != row || !lineReturned || lastRenderLine.Foreground != thisForeground)
{
var textPosition = this.GetCellPosition(btIndex);
if (textPosition == null)
{
continue;
}
if (lineReturned)
{
lastRenderLine.Data = charList.ToArray();
yield return(lastRenderLine);
}
charList.Clear();
lastRenderLine = new StringTextRenderLine {
Foreground = thisForeground,
StartPosition = textPosition.Value
};
lineReturned = true;
}
charList.Add(ch);
row = thisRow;
}
if (lineReturned)
{
lastRenderLine.Data = charList.ToArray();
yield return(lastRenderLine);
}
}
