/// <summary>
/// Creates a new IconImage object to represent a RT_ICON resource.
/// </summary>
/// <param name="library">The library that contains the resource.</param>
/// <param name="pResourceName">The name of the resource.</param>
unsafe public IconImage(Library library,
IntPtr pResourceName)
{
// Find the resource with the given name.
IntPtr hIconInfo = library.FindResource(pResourceName,
WindowsAPI.RT_ICON);
// Load the resource and get the resource bits.
IntPtr hIconRes = library.LoadResource(hIconInfo);
IntPtr pDibBits = Library.LockResource(hIconRes);
// We make a local copy of the DIB bits as pDibBits may be
// freed when the module is unloaded.
m_arDibBits = new byte[library.SizeofResource(hIconInfo)];
Marshal.Copy(pDibBits, m_arDibBits, 0, m_arDibBits.Length);
fixed(byte *pBytes = &m_arDibBits[0])
{
WindowsAPI.BITMAPINFO *pBitmapInfo = (WindowsAPI.BITMAPINFO *)pBytes;
// The header height value is the combined height of XOR and AND masks.
// So we simply divide by two to get the image height.
m_iHeight = pBitmapInfo->bmiHeader.biHeight / 2;
m_iWidth = pBitmapInfo->bmiHeader.biWidth;
m_iColors = pBitmapInfo->bmiHeader.biPlanes * pBitmapInfo->bmiHeader.biBitCount;
}
}
/// <summary>
/// Writes the image data to the stream.
/// </summary>
unsafe public void WriteImage(BinaryWriter writer)
{
fixed(byte *pBytes = &m_arDibBits[0])
{
// When we write the BITMAPINFO the image size must be set to zero.
// So we cache it here and restore it after we're done writing.
WindowsAPI.BITMAPINFO *pBitmapInfo = (WindowsAPI.BITMAPINFO *)pBytes;
uint biSizeImage = pBitmapInfo->bmiHeader.biSizeImage;
pBitmapInfo->bmiHeader.biSizeImage = 0;
writer.Write(m_arDibBits);
pBitmapInfo->bmiHeader.biSizeImage = biSizeImage;
}
}
/// <summary>
/// Writes the directory entry to the stream.
/// </summary>
unsafe public void WriteDirectoryEntry(BinaryWriter writer,
uint uiImageOffset)
{
WindowsAPI.FILEICONDIRENTRY data = new WindowsAPI.FILEICONDIRENTRY();
data.dwImageOffset = uiImageOffset;
data.bWidth = (byte)m_iWidth;
data.bHeight = (byte)m_iHeight;
fixed(byte *pBytes = &m_arDibBits[0])
{
WindowsAPI.BITMAPINFO *pBitmapInfo = (WindowsAPI.BITMAPINFO *)pBytes;
data.wPlanes = pBitmapInfo->bmiHeader.biPlanes;
data.wBitCount = pBitmapInfo->bmiHeader.biBitCount;
}
byte bColorCount = (byte)(data.wPlanes * data.wBitCount);
if (8 <= bColorCount)
{
data.bColorCount = 0;
}
else
{
data.bColorCount = (byte)(1 << bColorCount);
}
data.dwBytesInRes = (uint)Size;
writer.Write(data.bWidth);
writer.Write(data.bHeight);
writer.Write(data.bColorCount);
writer.Write(data.bReserved);
writer.Write(data.wPlanes);
writer.Write(data.wBitCount);
writer.Write(data.dwBytesInRes);
writer.Write(data.dwImageOffset);
}
