public void GetThumbnail(uint cx, out IntPtr phbmp, out WTS_ALPHATYPE pdwAlpha)
{
phbmp = IntPtr.Zero;
pdwAlpha = WTS_ALPHATYPE.WTSAT_UNKNOWN;
if (cx == 0 || cx > MaxThumbnailSize)
{
return;
}
Bitmap thumbnail = null;
using (FileStream isoStream = File.OpenRead(this.FilePath))
{
UdfReader cd = new UdfReader(isoStream);
//read META\DL img
if (cd.Exists(@"BDMV\META\DL"))
{
string[] files = cd.GetFiles(@"BDMV\META\DL", "*.jpg");
//find file that size is most similar and bigger than cx;
foreach (var item in files)
{
Stream fileStream = cd.OpenFile(item, FileMode.Open);
Bitmap bmp = new Bitmap(fileStream);
if (thumbnail != null)
{
if ((cx < Math.Max(thumbnail.Width, thumbnail.Height) && Math.Max(bmp.Width, bmp.Height) < Math.Max(thumbnail.Width, thumbnail.Height)) ||
(cx > Math.Max(thumbnail.Width, thumbnail.Height) && Math.Max(bmp.Width, bmp.Height) > Math.Max(thumbnail.Width, thumbnail.Height)))
{
thumbnail = bmp;
}
}
}
if (thumbnail == null)
{
return;
}
if (thumbnail.Width != cx && thumbnail.Height != cx)
{
// We are not the appropriate size for caller. Resize now while
// respecting the aspect ratio.
float scale = Math.Min((float)cx / thumbnail.Width, (float)cx / thumbnail.Height);
int scaleWidth = (int)(thumbnail.Width * scale);
int scaleHeight = (int)(thumbnail.Height * scale);
thumbnail = ResizeImage(thumbnail, scaleWidth, scaleHeight);
}
phbmp = thumbnail.GetHbitmap();
pdwAlpha = WTS_ALPHATYPE.WTSAT_RGB;
}
}
}
