private bool bFillBitmapInfo(IntPtr hdc, IntPtr hpal, ref System.Drawing.NativeMethods.BITMAPINFO_FLAT pbmi)
{
IntPtr zero = IntPtr.Zero;
bool flag = false;
try
{
zero = SafeNativeMethods.CreateCompatibleBitmap(new HandleRef(null, hdc), 1, 1);
if (zero == IntPtr.Zero)
{
throw new OutOfMemoryException(System.Drawing.SR.GetString("GraphicsBufferQueryFail"));
}
pbmi.bmiHeader_biSize = Marshal.SizeOf(typeof(System.Drawing.NativeMethods.BITMAPINFOHEADER));
pbmi.bmiColors = new byte[0x400];
SafeNativeMethods.GetDIBits(new HandleRef(null, hdc), new HandleRef(null, zero), 0, 0, IntPtr.Zero, ref pbmi, 0);
if (pbmi.bmiHeader_biBitCount <= 8)
{
return(this.bFillColorTable(hdc, hpal, ref pbmi));
}
if (pbmi.bmiHeader_biCompression == 3)
{
SafeNativeMethods.GetDIBits(new HandleRef(null, hdc), new HandleRef(null, zero), 0, pbmi.bmiHeader_biHeight, IntPtr.Zero, ref pbmi, 0);
}
flag = true;
}
finally
{
if (zero != IntPtr.Zero)
{
SafeNativeMethods.DeleteObject(new HandleRef(null, zero));
zero = IntPtr.Zero;
}
}
return(flag);
}
private IntPtr CreateCompatibleDIB(IntPtr hdc, IntPtr hpal, int ulWidth, int ulHeight, ref IntPtr ppvBits)
{
if (hdc == IntPtr.Zero)
{
throw new ArgumentNullException("hdc");
}
IntPtr zero = IntPtr.Zero;
System.Drawing.NativeMethods.BITMAPINFO_FLAT pbmi = new System.Drawing.NativeMethods.BITMAPINFO_FLAT();
switch (System.Drawing.UnsafeNativeMethods.GetObjectType(new HandleRef(null, hdc)))
{
case 3:
case 4:
case 10:
case 12:
if (this.bFillBitmapInfo(hdc, hpal, ref pbmi))
{
pbmi.bmiHeader_biWidth = ulWidth;
pbmi.bmiHeader_biHeight = ulHeight;
if (pbmi.bmiHeader_biCompression == 0)
{
pbmi.bmiHeader_biSizeImage = 0;
}
else if (pbmi.bmiHeader_biBitCount == 0x10)
{
pbmi.bmiHeader_biSizeImage = (ulWidth * ulHeight) * 2;
}
else if (pbmi.bmiHeader_biBitCount == 0x20)
{
pbmi.bmiHeader_biSizeImage = (ulWidth * ulHeight) * 4;
}
else
{
pbmi.bmiHeader_biSizeImage = 0;
}
pbmi.bmiHeader_biClrUsed = 0;
pbmi.bmiHeader_biClrImportant = 0;
zero = SafeNativeMethods.CreateDIBSection(new HandleRef(null, hdc), ref pbmi, 0, ref ppvBits, IntPtr.Zero, 0);
Win32Exception exception = null;
if (zero == IntPtr.Zero)
{
exception = new Win32Exception(Marshal.GetLastWin32Error());
}
if (exception != null)
{
throw exception;
}
}
return(zero);
}
throw new ArgumentException(System.Drawing.SR.GetString("DCTypeInvalid"));
}
private unsafe bool bFillColorTable(IntPtr hdc, IntPtr hpal, ref System.Drawing.NativeMethods.BITMAPINFO_FLAT pbmi)
{
bool flag = false;
byte[] lppe = new byte[sizeof(System.Drawing.NativeMethods.PALETTEENTRY) * 0x100];
fixed(byte *numRef = pbmi.bmiColors)
{
fixed(byte *numRef2 = lppe)
{
System.Drawing.NativeMethods.RGBQUAD * rgbquadPtr = (System.Drawing.NativeMethods.RGBQUAD *)numRef;
System.Drawing.NativeMethods.PALETTEENTRY *paletteentryPtr = (System.Drawing.NativeMethods.PALETTEENTRY *)numRef2;
int nEntries = ((int)1) << pbmi.bmiHeader_biBitCount;
if (nEntries <= 0x100)
{
uint num3;
IntPtr zero = IntPtr.Zero;
if (hpal == IntPtr.Zero)
{
zero = Graphics.GetHalftonePalette();
num3 = SafeNativeMethods.GetPaletteEntries(new HandleRef(null, zero), 0, nEntries, lppe);
}
else
{
num3 = SafeNativeMethods.GetPaletteEntries(new HandleRef(null, hpal), 0, nEntries, lppe);
}
if (num3 != 0)
{
for (int i = 0; i < nEntries; i++)
{
rgbquadPtr[i].rgbRed = paletteentryPtr[i].peRed;
rgbquadPtr[i].rgbGreen = paletteentryPtr[i].peGreen;
rgbquadPtr[i].rgbBlue = paletteentryPtr[i].peBlue;
rgbquadPtr[i].rgbReserved = 0;
}
flag = true;
}
}
}
}
return(flag);
}
private IntPtr CreateCompatibleDIB(IntPtr hdc, IntPtr hpal, int ulWidth, int ulHeight, ref IntPtr ppvBits)
{
if (hdc == IntPtr.Zero)
{
throw new ArgumentNullException("hdc");
}
IntPtr zero = IntPtr.Zero;
System.Drawing.NativeMethods.BITMAPINFO_FLAT pbmi = new System.Drawing.NativeMethods.BITMAPINFO_FLAT();
switch (System.Drawing.UnsafeNativeMethods.GetObjectType(new HandleRef(null, hdc)))
{
case 3:
case 4:
case 10:
case 12:
if (this.bFillBitmapInfo(hdc, hpal, ref pbmi))
{
pbmi.bmiHeader_biWidth = ulWidth;
pbmi.bmiHeader_biHeight = ulHeight;
if (pbmi.bmiHeader_biCompression == 0)
{
pbmi.bmiHeader_biSizeImage = 0;
}
else if (pbmi.bmiHeader_biBitCount == 0x10)
{
pbmi.bmiHeader_biSizeImage = (ulWidth * ulHeight) * 2;
}
else if (pbmi.bmiHeader_biBitCount == 0x20)
{
pbmi.bmiHeader_biSizeImage = (ulWidth * ulHeight) * 4;
}
else
{
pbmi.bmiHeader_biSizeImage = 0;
}
pbmi.bmiHeader_biClrUsed = 0;
pbmi.bmiHeader_biClrImportant = 0;
zero = SafeNativeMethods.CreateDIBSection(new HandleRef(null, hdc), ref pbmi, 0, ref ppvBits, IntPtr.Zero, 0);
Win32Exception exception = null;
if (zero == IntPtr.Zero)
{
exception = new Win32Exception(Marshal.GetLastWin32Error());
}
if (exception != null)
{
throw exception;
}
}
return zero;
}
throw new ArgumentException(System.Drawing.SR.GetString("DCTypeInvalid"));
}
