/// <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();
}
}
}
internal static void Resize(this TextureContent content, int newWidth, int newHeight)
{
// TODO: This should be refactored to use FreeImage
// with a higher quality filter.
var destination = new Bitmap(newWidth, newHeight);
using (var source = content.Faces[0][0].ToSystemBitmap())
using (var graphics = System.Drawing.Graphics.FromImage(destination))
{
var imageAttr = new ImageAttributes();
imageAttr.SetWrapMode(WrapMode.TileFlipXY);
var destRect = new System.Drawing.Rectangle(0, 0, newWidth, newHeight);
graphics.InterpolationMode = InterpolationMode.HighQualityBilinear;
graphics.DrawImage(source, destRect, 0, 0, source.Width, source.Height, GraphicsUnit.Pixel, imageAttr);
}
content.Faces[0][0] = destination.ToXnaBitmap(false); //we dont want to flip colors twice
}
