public override UInt32 ReadBlock(GR.Memory.ByteBuffer BufferTarget, UInt32 BytesToRead)
{
if (m_Stream == null)
{
return(0);
}
int bytesInCache = (int)m_Cache.Length - m_CacheBytesUsed;
// full in cache
if (BytesToRead <= bytesInCache)
{
BufferTarget.Resize(BytesToRead);
m_Cache.CopyTo(BufferTarget, m_CacheBytesUsed, (int)BytesToRead);
m_CacheBytesUsed += (int)BytesToRead;
return(BytesToRead);
}
UInt32 bytesRead = 0;
// partially in cache
BufferTarget.Resize((uint)bytesInCache);
m_Cache.CopyTo(BufferTarget, m_CacheBytesUsed, bytesInCache);
m_CacheBytesUsed += bytesInCache;
BytesToRead -= (uint)bytesInCache;
bytesRead = (UInt32)bytesInCache;
UInt32 BytesToReadNow = BytesToRead;
if (m_Stream.Position + BytesToRead > m_Stream.Length)
{
BytesToReadNow = (UInt32)(m_Stream.Length - m_Stream.Position);
}
UInt32 OriginalLength = (UInt32)BufferTarget.Length;
BufferTarget.Resize((UInt32)(BufferTarget.Length + BytesToReadNow));
m_Stream.Read(BufferTarget.Data(), (int)OriginalLength, (int)BytesToReadNow);
bytesRead += BytesToReadNow;
return(bytesRead);
}
public override UInt32 ReadBlock(GR.Memory.ByteBuffer BufferTarget, UInt32 BytesToRead)
{
if (m_Buffer == null)
{
return(0);
}
UInt32 BytesToReadNow = BytesToRead;
if (m_Position + BytesToRead > m_Buffer.Length)
{
BytesToReadNow = (UInt32)(m_Buffer.Length - m_Position);
}
UInt32 OriginalLength = (UInt32)BufferTarget.Length;
BufferTarget.Resize((UInt32)(BufferTarget.Length + BytesToReadNow));
for (int i = 0; i < BytesToReadNow; ++i)
{
BufferTarget.SetU8At((int)OriginalLength + i, m_Buffer.ByteAt(m_Position + i));
}
m_Position += (int)BytesToReadNow;
return(BytesToReadNow);
}
public void Create(int Width, int Height, System.Drawing.Imaging.PixelFormat PixelFormat)
{
Clear();
m_Width = Width;
m_Height = Height;
m_PixelFormat = PixelFormat;
int bytesPerLine = BitsPerPixel * Width / 8;
m_ImageData.Resize((uint)(bytesPerLine * Height));
switch (m_PixelFormat)
{
case System.Drawing.Imaging.PixelFormat.Format1bppIndexed:
m_PaletteData = new GR.Memory.ByteBuffer(2 * 3);
break;
case System.Drawing.Imaging.PixelFormat.Format4bppIndexed:
m_PaletteData = new GR.Memory.ByteBuffer(16 * 3);
break;
case System.Drawing.Imaging.PixelFormat.Format8bppIndexed:
m_PaletteData = new GR.Memory.ByteBuffer(256 * 3);
break;
case System.Drawing.Imaging.PixelFormat.Format16bppRgb555:
case System.Drawing.Imaging.PixelFormat.Format24bppRgb:
case System.Drawing.Imaging.PixelFormat.Format32bppArgb:
case System.Drawing.Imaging.PixelFormat.Format32bppRgb:
break;
default:
throw new NotSupportedException("Pixelformat " + PixelFormat + " not supported");
}
}
