void BuildPackedImage()
{
_packedImage = null;
_outputPreview.Invalidate();
// Remove any duplicates from the character set.
string characterSet = GetCharacterSetUnion();
CharacterInfo[] infos = new CharacterInfo[ characterSet.Length ];
Brush whiteBrush = new SolidBrush( Color.White );
Brush blackBrush = new SolidBrush( Color.Black );
// Get all the bitmap data and extents for the characters.
using ( Bitmap tempBitmap = new Bitmap( 512, 512, PixelFormat.Format32bppArgb ) )
{
using ( Graphics g = Graphics.FromImage( tempBitmap ) )
{
// Initialize it to black to start.
g.Clear( Color.Black );
// Initialize each CharacterInfo.
for ( int i=0; i < characterSet.Length; i++ )
{
CharacterInfo c = new CharacterInfo();
infos[i] = c;
c.Character = characterSet[i];
// Draw this character into tempBitmap.
_currentFont.DrawString( g, c.Character.ToString(), whiteBrush, new Point( 0, 0 ) );
// Scan to find the extents.
Rectangle? startingExtentsNullable = GetMaximumCharacterExtents( g, _currentFont, c.Character );
if ( !startingExtentsNullable.HasValue )
return;
// Make sure we're not accessing outside the bitmap itself. If this letter is larger than 512x512,
// then we've got bigger problems elsewhere!
Rectangle startingExtents = startingExtentsNullable.Value;
startingExtents.Width = Math.Min( startingExtents.Width, tempBitmap.Width );
startingExtents.Height = Math.Min( startingExtents.Height, tempBitmap.Height );
Rectangle extents;
ExtractImageData( tempBitmap, startingExtents, out c.Image, out extents );
c.XOffset = extents.X;
c.YOffset = extents.Y;
c.PackedWidth = extents.Width;
c.PackedHeight = extents.Height;
// Clear out the previous space used by it.
g.FillRectangle( blackBrush, new Rectangle( 0, 0, extents.X + extents.Width + 20, extents.Y + extents.Height + 20 ) );
}
}
}
int maxImageDimension = 1024;
// Now, pack all the characters in the output.
// First, sort by height.
CharacterInfo[] sorted = infos.OrderBy( x => -x.PackedHeight ).ToArray();
_finalCharacterSet = sorted;
// Now we can write the final index of each character.
for ( int i=0; i < _finalCharacterSet.Length; i++ )
_finalCharacterSet[i].SudoFontIndex = i;
int atomicPixels = ReadAtomicPixelsControl();
int packedWidth = 16;
int packedHeight = 0;
while ( packedWidth < maxImageDimension )
{
// We started out with a tiny width, so the height was super likely to be larger than the width.
// If we finally get it where the width and height are equal, or where width is just one power of
// two larger, then we're happy.
packedHeight = PackCharacters( sorted, packedWidth, atomicPixels );
if ( NextPowerOfTwo( packedWidth ) >= packedHeight )
break;
packedWidth <<= 1;
}
// Now render the final bitmap.
_packedImage = new Bitmap( packedWidth, NextPowerOfTwo( packedHeight ) );
RenderPackedImage( _packedImage, infos, _alphaOnlyControl.Checked );
}