/// <summary>
///
/// </summary>
/// <param name="stream"></param>
/// <returns></returns>
public static DibSection GetDibData(Stream stream)
{
var data = new DibSection();
var reader = new BinaryReader(stream);
reader.BaseStream.Seek(0, SeekOrigin.Begin);
if (reader.ReadByte() != 'B' || reader.ReadByte() != 'M')
{
throw new ArgumentException("Invalid bitmap stream.", "stream");
}
reader.BaseStream.Seek(10, SeekOrigin.Begin);
var offBits = reader.ReadInt32();
reader.ReadInt32(); // biSize
data.Width = reader.ReadInt32();
data.Height = reader.ReadInt32();
reader.ReadInt16(); // biPlanes
data.BitCount = reader.ReadInt16();
reader.BaseStream.Seek(offBits, SeekOrigin.Begin);
data.pixelsPerY = (((data.Width * (data.BitCount >> 3)) + 3) >> 2) << 2;
data.data = reader.ReadBytes(data.pixelsPerY * data.Height);
return(data);
}
/// <summary>
///
/// </summary>
/// <param name="stream"></param>
/// <returns></returns>
public static DibSection GetDibData(Stream stream)
{
var data = new DibSection();
var reader = new BinaryReader(stream);
reader.BaseStream.Seek(0, SeekOrigin.Begin);
if (reader.ReadByte() != 'B' || reader.ReadByte() != 'M')
{
throw new ArgumentException("Invalid bitmap stream.", "stream");
}
reader.BaseStream.Seek(10, SeekOrigin.Begin);
var offBits = reader.ReadInt32();
reader.ReadInt32(); // biSize
data.Width = reader.ReadInt32();
data.Height = reader.ReadInt32();
reader.ReadInt16(); // biPlanes
data.BitCount = reader.ReadInt16();
reader.BaseStream.Seek(offBits, SeekOrigin.Begin);
data.pixelsPerY = (((data.Width * (data.BitCount >> 3)) + 3) >> 2) << 2;
data.data = reader.ReadBytes(data.pixelsPerY * data.Height);
return data;
}
private void RebuildRegion(Stream stream, Color color)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
if (Region != IntPtr.Zero)
{
NativeMethods.DeleteObject(Region);
}
var data = DibSection.GetDibData(stream);
if (data.BitCount != 24)
{
throw new NotSupportedException("Supported only 24 bpp");
}
int mask;
if (color == Color.Transparent)
{
mask = data.GetPixel(0, 0);
}
else
{
mask = (color.B << 16) | (color.G << 8) | color.R;
}
Region = NativeMethods.CreateRectRgn(0, 0, 0, 0);
for (var y = 0; y < data.Height; y++)
{
for (var x = 0; x < data.Width; x++)
{
while ((x < data.Width) && (data.GetPixel(x, y) == mask))
{
x++;
}
var left = x;
while ((x < data.Width) && (data.GetPixel(x, y) != mask))
{
x++;
}
if ((x - left) > 0)
{
var rectRegion = NativeMethods.CreateRectRgn(left, y, x, y + 1);
NativeMethods.CombineRgn(Region, Region, rectRegion, RgnCombineMode.RGN_OR);
NativeMethods.DeleteObject(rectRegion);
}
}
}
}
