/// <summary>
/// Generates a full set of mipmaps for the texture.
/// </summary>
/// <param name="overwriteExistingMipmaps">true if the existing mipmap set is replaced with the new set; false otherwise.</param>
public virtual void GenerateMipmaps(bool overwriteExistingMipmaps)
{
// If we already have mipmaps and we're not supposed to overwrite
// them then return without any generation.
if (!overwriteExistingMipmaps && faces.Any(f => f.Count > 1))
{
return;
}
// Generate the mips for each face.
foreach (var face in faces)
{
// Remove any existing mipmaps.
var faceBitmap = face[0];
face.Clear();
face.Add(faceBitmap);
var faceType = faceBitmap.GetType();
int width = faceBitmap.Width;
int height = faceBitmap.Height;
while (width > 1 && height > 1)
{
width /= 2;
height /= 2;
var mip = (BitmapContent)Activator.CreateInstance(faceType, new object[] { width, height });
BitmapContent.Copy(faceBitmap, mip);
face.Add(mip);
}
}
}
/// <summary>
/// Generates a full set of mipmaps for the texture.
/// </summary>
/// <param name="overwriteExistingMipmaps">true if the existing mipmap set is replaced with the new set; false otherwise.</param>
public virtual void GenerateMipmaps(bool overwriteExistingMipmaps)
{
var imageAttr = new ImageAttributes();
imageAttr.SetWrapMode(WrapMode.TileFlipXY);
// If we already have mipmaps and we're not supposed to overwrite
// them then return without any generation.
if (!overwriteExistingMipmaps && faces.Any(f => f.Count > 1))
{
return;
}
// Generate the mips for each face.
foreach (var face in faces)
{
// Remove any existing mipmaps.
var faceBitmap = face[0];
face.Clear();
face.Add(faceBitmap);
int width = faceBitmap.Width, height = faceBitmap.Height;
while (width > 1 && height > 1)
{
var systemBitmap = face[face.Count - 1].ToSystemBitmap();
width /= 2;
height /= 2;
var bitmap = new Bitmap(width, height);
using (var graphics = System.Drawing.Graphics.FromImage(bitmap))
{
var destRect = new System.Drawing.Rectangle(0, 0, width, height);
graphics.InterpolationMode = InterpolationMode.HighQualityBilinear;
graphics.DrawImage(systemBitmap, destRect, 0, 0, width * 2, height * 2, GraphicsUnit.Pixel, imageAttr);
}
face.Add(bitmap.ToXnaBitmap(false)); //we dont want to flip textures twice
systemBitmap.Dispose();
}
}
}