private static byte[] FinalizeBitmap(IcoFrame source, BitmapEncoding encoding, Dialect dialect, ByteWriter writer, uint offsetToData, uint offsetToImageSize)
{
var offsetToEndOfData = writer.SeekOffset;
if (dialect == Dialect.Ico)
{
var padding = writer.Data.Count % 4;
var inferMaskFromAlpha = (source.Encoding.PixelFormat == BitmapEncoding.Pixel_argb32 && encoding != BitmapEncoding.Pixel_argb32);
for (var y = source.CookedData.Height - 1; y >= 0; y--)
{
var bits = new BitWriter(writer);
for (var x = 0; x < source.CookedData.Width; x++)
{
var mask = inferMaskFromAlpha
? (source.CookedData[x, y].A == 0)
: source.Mask[x, y];
bits.AddBit1((byte)(mask ? 1 : 0));
}
while ((writer.Data.Count % 4) != padding)
{
writer.AddUint8(0);
}
}
}
if (dialect != Dialect.Ico)
{
writer.SeekOffset = 2;
writer.AddUint32((uint)writer.Data.Count);
writer.SeekOffset = 10;
writer.AddUint32(offsetToData);
}
writer.SeekOffset = (int)offsetToImageSize;
writer.AddUint32((uint)(offsetToEndOfData - offsetToData)); // biSizeImage
return(writer.Data.ToArray());
}
