public void CopyFrom(BitmapInfoHeader bmi)
{
biSize = bmi.biSize;
biWidth = bmi.biWidth;
biHeight = bmi.biHeight;
biPlanes = bmi.biPlanes;
biBitCount = bmi.biBitCount;
biCompression = bmi.biCompression;
biSizeImage = bmi.biSizeImage;
biSizeImage = bmi.biSizeImage;
biYPelsPerMeter = bmi.biYPelsPerMeter;
biClrUsed = bmi.biClrUsed;
biClrImportant = bmi.biClrImportant;
if(bmi is BitmapInfoHeaderWithData)
{
var ext = this as BitmapInfoHeaderWithData;
var ext2 = bmi as BitmapInfoHeaderWithData;
ext.bmiColors = new int[ext2.bmiColors.Length];
ext2.bmiColors.CopyTo(ext.bmiColors, 0);
}
}
public IntPtr MarshalManagedToNative(object managedObj)
{
m_bmi = managedObj as BitmapInfoHeader;
IntPtr ip = m_bmi.GetPtr();
return ip;
}
public static BitmapInfoHeader PtrToBMI(IntPtr pNativeData)
{
int iEntries;
int biCompression;
int biClrUsed;
int biBitCount;
biBitCount = Marshal.ReadInt16(pNativeData, 14);
biCompression = Marshal.ReadInt32(pNativeData, 16);
biClrUsed = Marshal.ReadInt32(pNativeData, 32);
if(biCompression == 3) // BI_BITFIELDS
{
iEntries = 3;
}
else if(biClrUsed > 0)
{
iEntries = biClrUsed;
}
else if(biBitCount <= 8)
{
iEntries = 1 << biBitCount;
}
else
{
iEntries = 0;
}
BitmapInfoHeader bmi;
if(iEntries == 0)
{
// Create a simple BitmapInfoHeader struct
bmi = new BitmapInfoHeader();
Marshal.PtrToStructure(pNativeData, bmi);
}
else
{
var ext = new BitmapInfoHeaderWithData();
ext.biSize = Marshal.ReadInt32(pNativeData, 0);
ext.biWidth = Marshal.ReadInt32(pNativeData, 4);
ext.biHeight = Marshal.ReadInt32(pNativeData, 8);
ext.biPlanes = Marshal.ReadInt16(pNativeData, 12);
ext.biBitCount = Marshal.ReadInt16(pNativeData, 14);
ext.biCompression = Marshal.ReadInt32(pNativeData, 16);
ext.biSizeImage = Marshal.ReadInt32(pNativeData, 20);
ext.biXPelsPerMeter = Marshal.ReadInt32(pNativeData, 24);
ext.biYPelsPerMeter = Marshal.ReadInt32(pNativeData, 28);
ext.biClrUsed = Marshal.ReadInt32(pNativeData, 32);
ext.biClrImportant = Marshal.ReadInt32(pNativeData, 36);
bmi = ext;
ext.bmiColors = new int[iEntries];
var ip2 = new IntPtr(pNativeData.ToInt64() + Marshal.SizeOf(typeof(BitmapInfoHeader)));
Marshal.Copy(ip2, ext.bmiColors, 0, iEntries);
}
return bmi;
}
// It appears this routine is never called
public void CleanUpManagedData(object ManagedObj)
{
m_bmi = null;
}
