private Stream Asciirize(Stream sourceStream, FontInfo fontInfo)
{
using (var sourceImage = new Bitmap(sourceStream))
using (var targetImage = new Bitmap(sourceImage.Width, sourceImage.Height))
using (var targetGraphics = Graphics.FromImage(targetImage))
{
var graphicsUnit = GraphicsUnit.Pixel;
var sourceBounds = sourceImage.GetBounds(ref graphicsUnit);
targetGraphics.FillRectangle(new SolidBrush(Color.Black), new Rectangle(Point.Empty, targetImage.Size));
for (var widthPos = 0; widthPos < sourceImage.Width; widthPos += fontInfo.Width)
{
for (var heightPos = 0; heightPos < sourceImage.Height; heightPos += fontInfo.Height)
{
var rect = new Rectangle(widthPos, heightPos, fontInfo.Width, fontInfo.Height);
if (!sourceBounds.Contains(rect))
{
break;
}
using (var snippet = sourceImage.Clone(rect, sourceImage.PixelFormat))
{
var matchingCharacter = _characterMapper.FindBestVisualMatch(fontInfo, snippet);
var centerColor = snippet.GetPixel(fontInfo.Width / 2, fontInfo.Height / 2);
targetGraphics.DrawString(matchingCharacter, fontInfo.Font, new SolidBrush(centerColor), widthPos, heightPos);
}
}
}
var resultStream = new MemoryStream();
targetGraphics.Flush();
targetImage.Save(resultStream, sourceImage.RawFormat);
resultStream.Seek(0, SeekOrigin.Begin);
return(resultStream);
}
}