private int AllocateMipMaps(DdsLoadInfo info)
{
var len = CalcSize(info);
if (Header.MipMapCount <= 1)
{
return(len);
}
_mipMaps = new MipMapOffset[Header.MipMapCount - 1];
var totalLen = len;
for (int i = 0; i < Header.MipMapCount - 1; i++)
{
int width = (int)Math.Max(info.DivSize, (int)(Header.Width / Math.Pow(2, i + 1)));
int height = (int)Math.Max(info.DivSize, Header.Height / Math.Pow(2, i + 1));
int stride = Util.Stride(width, BitsPerPixel);
len = stride * height;
_mipMaps[i] = new MipMapOffset(width, height, stride, totalLen, len);
totalLen += len;
}
return(totalLen);
}
/// <summary>Calculates the number of bytes to hold image data</summary>
private int CalcSize(DdsLoadInfo info)
{
var widthBytes = Util.Stride((int)Header.Width, BitsPerPixel);
int width = (int)Math.Max(info.DivSize * BytesPerPixel, widthBytes);
int height = (int)Math.Max(info.DivSize, Header.Height);
return((int)(width * (height / info.DivSize)));
}
/// <summary>Calculates the number of bytes to hold image data</summary>
private int CalcSize(DdsLoadInfo info)
{
int height = (int)Math.Max(info.DivSize, Header.Height);
return(Stride * height);
}