/// <summary>
/// Create a palette from the list of colors.
/// </summary>
public BitmapPalette(IList<Color> colors)
{
if (colors == null)
{
throw new ArgumentNullException("colors");
}
int count = colors.Count;
if (count < 1 || count > 256)
{
throw new InvalidOperationException(SR.Get(SRID.Image_PaletteZeroColors, null));
}
Color[] colorArray = new Color[count];
for (int i = 0; i < count; ++i)
{
colorArray[i] = colors[i];
}
_colors = new PartialList<Color>(colorArray);
_palette = CreateInternalPalette();
UpdateUnmanaged();
}
/// <summary>
/// Create a palette from the list of colors.
/// </summary>
public BitmapPalette(IList <Color> colors)
{
if (colors == null)
{
throw new ArgumentNullException("colors");
}
int count = colors.Count;
if (count < 1 || count > 256)
{
throw new InvalidOperationException(SR.Get(SRID.Image_PaletteZeroColors, null));
}
Color[] colorArray = new Color[count];
for (int i = 0; i < count; ++i)
{
colorArray[i] = colors[i];
}
_colors = new PartialList <Color>(colorArray);
_palette = CreateInternalPalette();
UpdateUnmanaged();
}
private void UpdateManaged()
{
Debug.Assert(_palette != null && !_palette.IsInvalid);
int numColors = 0;
int cActualColors = 0;
HRESULT.Check(UnsafeNativeMethods.WICPalette.GetColorCount(_palette,
out numColors));
List <Color> colors = new List <Color>();
if (numColors < 1 || numColors > 256)
{
throw new InvalidOperationException(SR.Get(SRID.Image_PaletteZeroColors, null));
}
else
{
ImagePaletteColor[] paletteColorArray = new ImagePaletteColor[numColors];
unsafe
{
fixed(void *paletteColorArrayPinned = paletteColorArray)
{
HRESULT.Check(UnsafeNativeMethods.WICPalette.GetColors(
_palette,
numColors,
(IntPtr)paletteColorArrayPinned,
out cActualColors));
Debug.Assert(cActualColors == numColors);
}
}
for (int i = 0; i < numColors; ++i)
{
ImagePaletteColor c = paletteColorArray[i];
colors.Add(Color.FromArgb(c.A, c.R, c.G, c.B));
}
}
_colors = new PartialList <Color>(colors);
}
private void UpdateManaged()
{
Debug.Assert(_palette != null && !_palette.IsInvalid);
int numColors = 0;
int cActualColors = 0;
HRESULT.Check(UnsafeNativeMethods.WICPalette.GetColorCount(_palette,
out numColors));
List<Color> colors = new List<Color>();
if (numColors < 1 || numColors > 256)
{
throw new InvalidOperationException(SR.Get(SRID.Image_PaletteZeroColors, null));
}
else
{
ImagePaletteColor[] paletteColorArray = new ImagePaletteColor[numColors];
unsafe
{
fixed(void* paletteColorArrayPinned = paletteColorArray)
{
HRESULT.Check(UnsafeNativeMethods.WICPalette.GetColors(
_palette,
numColors,
(IntPtr)paletteColorArrayPinned,
out cActualColors));
Debug.Assert(cActualColors == numColors);
}
}
for (int i = 0; i < numColors; ++i)
{
ImagePaletteColor c = paletteColorArray[i];
colors.Add(Color.FromArgb(c.A, c.R, c.G, c.B));
}
}
_colors = new PartialList<Color>(colors);
}
