/// <include file='doc\BufferedGraphicsContext.uex' path='docs/doc[@for="BufferedGraphicsContext.bFillColorTable"]/*' />
/// <devdoc>
// bFillColorTable
//
// Initialize the color table of the BITMAPINFO pointed to by pbmi. Colors
// are set to the current system palette.
//
// Note: call only valid for displays of 8bpp or less.
//
// Returns:
// TRUE if successful, FALSE otherwise.
//
// History:
// 23-Jan-1996 -by- Gilman Wong [Microsoft]
// Wrote it.
//
// 15-Nov-2000 -by- Chris Anderson [Microsoft]
// Ported it to C#
//
/// </devdoc>
private unsafe bool bFillColorTable(IntPtr hdc, IntPtr hpal, ref NativeMethods.BITMAPINFO_FLAT pbmi)
{
bool bRet = false;
byte[] aj = new byte[sizeof(NativeMethods.PALETTEENTRY) * 256];
int i, cColors;
fixed(byte *pcolors = pbmi.bmiColors)
{
fixed(byte *ppal = aj)
{
NativeMethods.RGBQUAD * prgb = (NativeMethods.RGBQUAD *)pcolors;
NativeMethods.PALETTEENTRY *lppe = (NativeMethods.PALETTEENTRY *)ppal;
cColors = 1 << pbmi.bmiHeader_biBitCount;
if (cColors <= 256)
{
Debug.WriteLineIf(DoubleBuffering.TraceVerbose, "8 bit or less...");
// NOTE : Didn't port "MyGetPaletteEntries" as it is only
// : for 4bpp displays, which we don't work on anyway.
uint palRet;
IntPtr palHalftone = IntPtr.Zero;
if (hpal == IntPtr.Zero)
{
Debug.WriteLineIf(DoubleBuffering.TraceVerbose, "using halftone palette...");
palHalftone = Graphics.GetHalftonePalette();
palRet = SafeNativeMethods.GetPaletteEntries(new HandleRef(null, palHalftone), 0, cColors, aj);
}
else
{
Debug.WriteLineIf(DoubleBuffering.TraceVerbose, "using custom palette...");
palRet = SafeNativeMethods.GetPaletteEntries(new HandleRef(null, hpal), 0, cColors, aj);
}
if (palRet != 0)
{
for (i = 0; i < cColors; i++)
{
prgb[i].rgbRed = lppe[i].peRed;
prgb[i].rgbGreen = lppe[i].peGreen;
prgb[i].rgbBlue = lppe[i].peBlue;
prgb[i].rgbReserved = 0;
}
bRet = true;
}
else
{
Debug.WriteLineIf(DoubleBuffering.TraceWarning, "bFillColorTable: MyGetSystemPaletteEntries failed\n");
}
}
}
}
return(bRet);
}
/// <summary>
/// Initialize the color table of the BITMAPINFO pointed to by pbmi. Colors
/// are set to the current system palette.
///
/// Note: call only valid for displays of 8bpp or less.
/// </summary>
/// <returns>True is successful, false otherwise.</returns>
private unsafe bool FillColorTable(IntPtr hdc, IntPtr hpal, ref NativeMethods.BITMAPINFO_FLAT pbmi)
{
byte[] aj = new byte[sizeof(NativeMethods.PALETTEENTRY) * 256];
fixed(byte *pcolors = pbmi.bmiColors)
{
fixed(byte *ppal = aj)
{
NativeMethods.RGBQUAD * prgb = (NativeMethods.RGBQUAD *)pcolors;
NativeMethods.PALETTEENTRY *lppe = (NativeMethods.PALETTEENTRY *)ppal;
int cColors = 1 << pbmi.bmiHeader_biBitCount;
if (cColors <= 256)
{
// Note: we don't support 4bpp displays.
uint palRet;
IntPtr palHalftone = IntPtr.Zero;
if (hpal == IntPtr.Zero)
{
palHalftone = Graphics.GetHalftonePalette();
palRet = SafeNativeMethods.GetPaletteEntries(new HandleRef(null, palHalftone), 0, cColors, aj);
}
else
{
palRet = SafeNativeMethods.GetPaletteEntries(new HandleRef(null, hpal), 0, cColors, aj);
}
if (palRet != 0)
{
for (int i = 0; i < cColors; i++)
{
prgb[i].rgbRed = lppe[i].peRed;
prgb[i].rgbGreen = lppe[i].peGreen;
prgb[i].rgbBlue = lppe[i].peBlue;
prgb[i].rgbReserved = 0;
}
return(true);
}
}
}
}
return(false);
}
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);
}
