private List <Glyph> ExtractGlyphs(PixelBitmapContent <Color> bitmap)
{
var glyphs = new List <Glyph>();
var regions = new List <Rectangle>();
int width = bitmap.Width;
var pixels = bitmap.GetPixelSpan();
for (int y = 0; y < bitmap.Height; y++)
{
for (int x = 0; x < width; x++)
{
if (pixels[x + y * width] != _transparentPixel)
{
// if we don't have a region that has this pixel already
var re = regions.Find(r =>
{
return(r.Contains(x, y));
});
if (re == Rectangle.Empty)
{
// we have found the top, left of a image.
// we now need to scan for the 'bounds'
int top = y;
int bottom = y;
int left = x;
int right = x;
while (pixels[right + bottom * width] != _transparentPixel)
{
right++;
}
while (pixels[left + bottom * width] != _transparentPixel)
{
bottom++;
}
// we got a glyph :)
regions.Add(new Rectangle(left, top, right - left, bottom - top));
x = right;
}
else
{
x += re.Width;
}
}
}
}
for (int i = 0; i < regions.Count; i++)
{
var rect = regions[i];
var newBitmap = new PixelBitmapContent <Color>(rect.Width, rect.Height);
BitmapContent.Copy(bitmap, rect, newBitmap, new Rectangle(0, 0, rect.Width, rect.Height));
var glyph = new Glyph(GetCharacterForIndex(i), newBitmap);
glyph.CharacterWidths.B = glyph.Bitmap.Width;
glyphs.Add(glyph);
}
return(glyphs);
}