/// <summary>
/// constructs a indexed icon image from a stream,
/// not accessible outside the dll
/// </summary>
/// <param name="str">The string.</param>
/// <param name="sz">The sz.</param>
/// <param name="bpp">The BPP.</param>
internal IconImageIndexed(Stream str, Size sz, short bpp)
{
using (SimpleReader rdr = new SimpleReader(str))
{
#region read palette
int colorcount = Quantizer.LengthOfPalette(bpp);
ColorBgra[] palette = new ColorBgra[colorcount];
for (int i = 0; i < palette.Length; i++)
{
palette[i].A = 255;
palette[i].B = rdr.ReadByte();
palette[i].G = rdr.ReadByte();
palette[i].R = rdr.ReadByte();
rdr.ReadByte(); //reserved
}
_octree = Octree.FromColorArray(palette);
#endregion
#region read indexed data
//create bitmap and lock it
_bitmap = new Bitmap(sz.Width, sz.Height, PixelFormat.Format32bppArgb);
BitmapData bd = _bitmap.LockBits(
new Rectangle(Point.Empty, _bitmap.Size),
ImageLockMode.ReadOnly,
PixelFormat.Format32bppArgb);
ColorBgra *scan0 = (ColorBgra *)bd.Scan0;
//read pixels
int indexmask = (1 << bpp) - 1;
scan0 += bd.Width * bd.Height;
for (int y = 0; y < bd.Height; y++)
{
scan0 -= bd.Width;
int indexpos = 8 - bpp,
data = rdr.ReadInt32();
for (int x = 0; x < bd.Width; x++)
{
if (indexpos >= 32)
{
data = rdr.ReadInt32();
indexpos -= 32;
}
scan0[x] = palette[indexmask & (data >> indexpos)];
if (indexpos % 8 == 0)
{
indexpos += 16 - bpp;
}
else
{
indexpos -= bpp;
}
}
}
ANDMap.StampToBitmapData(rdr, bd);
_bitmap.UnlockBits(bd);
#endregion
}
_bitsperpixel = bpp;
}
/// <summary>
/// constructs a 24bpp icon image from a stream,
/// not accessible outside the dll
/// </summary>
/// <param name="str">The string.</param>
/// <param name="sz">The sz.</param>
internal IconImage24bpp(Stream str, Size sz)
{
#region read 24bpp data
//create bitmap and lock it
_bitmap = new Bitmap(sz.Width, sz.Height, PixelFormat.Format32bppArgb);
BitmapData bd = _bitmap.LockBits(
new Rectangle(Point.Empty, _bitmap.Size),
ImageLockMode.ReadOnly,
PixelFormat.Format32bppArgb);
ColorBgra *scan0 = (ColorBgra *)bd.Scan0;
//calculate padding at end of stride
int padbytescount = (_bitmap.Width * 3) % 4;
//read pixels, note: bottom-up, left-right
ColorBgra color = ColorBgra.Black;
using (SimpleReader rdr = new SimpleReader(str))
{
scan0 += bd.Width * bd.Height;
for (int y = 0; y < bd.Height; y++)
{
scan0 -= bd.Width;
for (int x = 0; x < bd.Width; x++)
{
color.Blue = rdr.ReadByte();
color.Green = rdr.ReadByte();
color.Red = rdr.ReadByte();
scan0[x] = color;
}
//pad to 32bit
if (padbytescount != 0)
{
rdr.ReadBytes(padbytescount);
}
}
ANDMap.StampToBitmapData(rdr, bd);
}
_bitmap.UnlockBits(bd);
#endregion
_bitsperpixel = 24;
}