public static void Crop(Glyph glyph)
{
// Crop the top.
while ((glyph.Subrect.Height > 1) && BitmapUtils.IsAlphaEntirely(0, glyph.Bitmap, new Rectangle(glyph.Subrect.X, glyph.Subrect.Y, glyph.Subrect.Width, 1)))
{
glyph.Subrect.Y++;
glyph.Subrect.Height--;
glyph.YOffset++;
}
// Crop the bottom.
while ((glyph.Subrect.Height > 1) && BitmapUtils.IsAlphaEntirely(0, glyph.Bitmap, new Rectangle(glyph.Subrect.X, glyph.Subrect.Bottom - 1, glyph.Subrect.Width, 1)))
{
glyph.Subrect.Height--;
}
// Crop the left.
while ((glyph.Subrect.Width > 1) && BitmapUtils.IsAlphaEntirely(0, glyph.Bitmap, new Rectangle(glyph.Subrect.X, glyph.Subrect.Y, 1, glyph.Subrect.Height)))
{
glyph.Subrect.X++;
glyph.Subrect.Width--;
glyph.XOffset++;
}
// Crop the right.
while ((glyph.Subrect.Width > 1) && BitmapUtils.IsAlphaEntirely(0, glyph.Bitmap, new Rectangle(glyph.Subrect.Right - 1, glyph.Subrect.Y, 1, glyph.Subrect.Height)))
{
glyph.Subrect.Width--;
}
}
public void Import(SpriteFontAsset options, List <char> characters)
{
// Load the source bitmap.
Bitmap bitmap;
try
{
bitmap = new Bitmap(options.Source);
}
catch
{
throw new FontNotFoundException(options.Source);
}
// Convert to our desired pixel format.
bitmap = BitmapUtils.ChangePixelFormat(bitmap, PixelFormat.Format32bppArgb);
// What characters are included in this font?
int characterIndex = 0;
char currentCharacter = '\0';
// Split the source image into a list of individual glyphs.
var glyphList = new List <Glyph>();
Glyphs = glyphList;
LineSpacing = 0;
foreach (Rectangle rectangle in FindGlyphs(bitmap))
{
if (characterIndex < characters.Count)
{
currentCharacter = characters[characterIndex++];
}
else
{
currentCharacter++;
}
glyphList.Add(new Glyph(currentCharacter, bitmap, rectangle)
{
XAdvance = rectangle.Width
});
LineSpacing = Math.Max(LineSpacing, rectangle.Height);
}
// If the bitmap doesn't already have an alpha channel, create one now.
if (BitmapUtils.IsAlphaEntirely(255, bitmap))
{
BitmapUtils.ConvertGreyToAlpha(bitmap, new Rectangle(0, 0, bitmap.Width, bitmap.Height));
}
}
