/// <summary>
/// Creates a new pix instance using an existing handle to a pix structure.
/// </summary>
/// <remarks>
/// Note that the resulting instance takes ownership of the data structure.
/// </remarks>
/// <param name="handle"></param>
private Pix(IntPtr handle)
{
if (handle == IntPtr.Zero)
{
throw new ArgumentNullException("handle");
}
this.handle = new HandleRef(this, handle);
this.width = LeptonicaApi.Native.pixGetWidth(this.handle);
this.height = LeptonicaApi.Native.pixGetHeight(this.handle);
this.depth = LeptonicaApi.Native.pixGetDepth(this.handle);
var colorMapHandle = LeptonicaApi.Native.pixGetColormap(this.handle);
if (colorMapHandle != IntPtr.Zero)
{
this.colormap = new PixColormap(colorMapHandle);
}
}
private void CopyColormap(Bitmap img, Pix pix)
{
var imgPalette = img.Palette;
var imgPaletteEntries = imgPalette.Entries;
var pixColormap = PixColormap.Create(pix.Depth);
try {
for (int i = 0; i < imgPaletteEntries.Length; i++)
{
if (!pixColormap.AddColor((PixColor)imgPaletteEntries[i]))
{
throw new InvalidOperationException(String.Format("Failed to add colormap entry {0}.", i));
}
}
pix.Colormap = pixColormap;
} catch (Exception) {
pixColormap.Dispose();
throw;
}
}