public static int GetMemorySize(int width, int height, int depth, PixelFormat format)
{
if (Compressed(format))
{
switch (format)
{
// DXT formats work by dividing the image into 4x4 blocks, then encoding each
// 4x4 block with a certain number of bytes. DXT can only be used on 2D images.
case PixelFormat.DXT1:
Debug.Assert(depth == 1);
return(((width + 3) / 4) * ((height + 3) / 4) * 8);
case PixelFormat.DXT2:
case PixelFormat.DXT3:
case PixelFormat.DXT4:
case PixelFormat.DXT5:
Debug.Assert(depth == 1);
return(((width + 3) / 4) * ((height + 3) / 4) * 16);
default:
throw new Exception("Invalid compressed pixel format, in PixelBox.GetMemorySize");
}
}
else
{
return(width * height * depth * PixelConverter.GetNumElemBytes(format));
}
}
