// Imports the source font associated to the given command line options.
public void Import(CommandLineOptions options)
{
if (options == null)
{
throw new NullReferenceException("The given command line options may not be equal to null.");
}
// Load the source bitmap.
Bitmap bitmap;
try {
bitmap = new Bitmap(options.SourceFont);
}
catch {
throw new Exception(string.Format("Unable to load '{0}'.", options.SourceFont));
}
// Convert to our desired pixel format.
bitmap = BitmapUtils.ConvertToPixelFormat(bitmap, PixelFormat.Format32bppArgb);
// What characters are included in this font?
var characters = CharacterRegion.Flatten(options.CharacterRegions).ToArray();
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 region in BitmapUtils.GetGlyphRegions(bitmap, IsMarkerColor))
{
if (characterIndex < characters.Length)
{
currentCharacter = characters[characterIndex];
}
++currentCharacter;
glyphList.Add(new Glyph(currentCharacter, bitmap, region));
LineSpacing = Math.Max(LineSpacing, region.Height);
}
// If the bitmap doesn't already have an alpha channel, create one now.
if (BitmapUtils.MatchesAlpha(255, bitmap))
{
BitmapUtils.ConvertGreyToAlpha(bitmap);
}
}
// Rasterizes a single character glyph.
static Glyph ImportGlyph(char character, Font font, Brush brush, StringFormat stringFormat, Bitmap bitmap, Graphics graphics)
{
string characterString = character.ToString();
// Measure the size of this character.
SizeF size = graphics.MeasureString(characterString, font, Point.Empty, stringFormat);
int characterWidth = (int)Math.Ceiling(size.Width);
int characterHeight = (int)Math.Ceiling(size.Height);
// Pad to make sure we capture any overhangs (negative ABC spacing, etc.)
int padWidth = characterWidth;
int padHeight = characterHeight / 2;
int bitmapWidth = characterWidth + padWidth * 2;
int bitmapHeight = characterHeight + padHeight * 2;
if (bitmapWidth > MaxGlyphSize || bitmapHeight > MaxGlyphSize)
{
throw new Exception("Excessively large glyph won't fit in my lazily implemented fixed size temp surface.");
}
// Render the character.
graphics.Clear(Color.Black);
graphics.DrawString(characterString, font, brush, padWidth, padHeight, stringFormat);
graphics.Flush();
// Clone the newly rendered image.
Bitmap glyphBitmap = bitmap.Clone(new Rectangle(0, 0, bitmapWidth, bitmapHeight), PixelFormat.Format32bppArgb);
BitmapUtils.ConvertGreyToAlpha(glyphBitmap);
// Query its ABC spacing.
float?abc = GetCharacterWidth(character, font, graphics);
// Construct the output Glyph object.
return(new Glyph(character, glyphBitmap)
{
OffsetX = -padWidth,
AdvanceX = abc.HasValue ? padWidth - bitmapWidth + abc.Value : -padWidth,
OffsetY = -padHeight,
});
}