private ColorPalette _GetColorPalette()
{
int size = -1;
int status = SafeNativeMethods.Gdip.GdipGetImagePaletteSize(new HandleRef(this, this.nativeImage), out size);
if (status != 0)
{
throw SafeNativeMethods.Gdip.StatusException(status);
}
ColorPalette palette = new ColorPalette(size);
IntPtr ptr = Marshal.AllocHGlobal(size);
status = SafeNativeMethods.Gdip.GdipGetImagePalette(new HandleRef(this, this.nativeImage), ptr, size);
try
{
if (status != 0)
{
throw SafeNativeMethods.Gdip.StatusException(status);
}
palette.ConvertFromMemory(ptr);
}
finally
{
Marshal.FreeHGlobal(ptr);
}
return(palette);
}
private ColorPalette _GetColorPalette()
{
int size = -1;
int status = SafeNativeMethods.Gdip.GdipGetImagePaletteSize(new HandleRef(this, nativeImage), out size);
// "size" is total byte size:
// sizeof(ColorPalette) + (pal->Count-1)*sizeof(ARGB)
if (status != SafeNativeMethods.Gdip.Ok)
{
throw SafeNativeMethods.Gdip.StatusException(status);
}
ColorPalette palette = new ColorPalette(size);
// Memory layout is:
// UINT Flags
// UINT Count
// ARGB Entries[size]
IntPtr memory = Marshal.AllocHGlobal(size);
status = SafeNativeMethods.Gdip.GdipGetImagePalette(new HandleRef(this, nativeImage), memory, size);
try
{
if (status != SafeNativeMethods.Gdip.Ok)
{
throw SafeNativeMethods.Gdip.StatusException(status);
}
palette.ConvertFromMemory(memory);
}
finally
{
Marshal.FreeHGlobal(memory);
}
return(palette);
}
internal ColorPalette retrieveGDIPalette()
{
int bytes;
ColorPalette ret = new ColorPalette();
int st = Gdip.GdipGetImagePaletteSize(nativeImage, out bytes);
Gdip.CheckStatus(st);
IntPtr palette_data = Marshal.AllocHGlobal(bytes);
try
{
st = Gdip.GdipGetImagePalette(nativeImage, palette_data, bytes);
Gdip.CheckStatus(st);
ret.ConvertFromMemory(palette_data);
return ret;
}
finally
{
Marshal.FreeHGlobal(palette_data);
}
}
internal ColorPalette retrieveGDIPalette()
{
int bytes;
ColorPalette ret = new ColorPalette();
Status st = SafeNativeMethods.Gdip.GdipGetImagePaletteSize(nativeObject, out bytes);
SafeNativeMethods.Gdip.CheckStatus(st);
IntPtr palette_data = Marshal.AllocHGlobal(bytes);
try
{
st = SafeNativeMethods.Gdip.GdipGetImagePalette(nativeObject, palette_data, bytes);
SafeNativeMethods.Gdip.CheckStatus(st);
ret.ConvertFromMemory(palette_data);
return(ret);
}
finally
{
Marshal.FreeHGlobal(palette_data);
}
}
