private bool CreateThumbNail(ThumbnailOrder order, GeckoWebBrowser browser, out Image thumbnail)
{
// runs on threadpool thread
thumbnail = null;
using (var temp = EnhancedImageServer.MakeSimulatedPageFileInBookFolder(order.Document))
{
order.Done = false;
browser.Tag = order;
if (!OpenTempFileInBrowser(browser, temp.Key))
return false;
var browserSize = SetWidthAndHeight(browser);
if (browserSize.Height == 0) //happens when we run into the as-yet-unreproduced-or-fixed bl-254
return false; // will try again later
try
{
Logger.WriteMinorEvent("HtmlThumNailer ({2}): browser.GetBitmap({0},{1})", browserSize.Width,
(uint) browserSize.Height,
Thread.CurrentThread.ManagedThreadId);
//BUG (April 2013) found that the initial call to GetBitMap always had a zero width, leading to an exception which
//the user doesn't see and then all is well. So at the moment, we avoid the exception, and just leave with
//the placeholder thumbnail.
if (browserSize.Width == 0 || browserSize.Height == 0)
{
var paperSizeName = GetPaperSizeName(order.Document.RawDom);
throw new ApplicationException("Problem getting thumbnail browser for document with Paper Size: " + paperSizeName);
}
using (Image fullsizeImage = CreateImage(browser))
{
if (_disposed)
return false;
thumbnail = MakeThumbNail(fullsizeImage, order.Options);
return true;
}
}
catch (Exception error)
{
Logger.WriteEvent("HtmlThumbNailer ({0}) got {1}", Thread.CurrentThread.ManagedThreadId, error.Message);
Logger.WriteEvent("Disposing of all browsers in hopes of getting a fresh start on life");
foreach (var browserCacheForDifferentPaperSize in _browserCacheForDifferentPaperSizes)
{
try
{
Logger.WriteEvent("Disposing of browser {0}", browserCacheForDifferentPaperSize.Key);
browserCacheForDifferentPaperSize.Value.Dispose();
}
catch (Exception e2)
{
Logger.WriteEvent(
"While trying to dispose of thumbnailer browsers as a result of an exception, go another: " + e2.Message);
}
}
_browserCacheForDifferentPaperSizes.Clear();
#if DEBUG
_syncControl.Invoke((Action) (() => Debug.Fail(error.Message)));
#endif
}
}
return false;
}
