public void GetResizedPageImage(PDFRendererPageControl page_control, int page, int height, int width, ResizedPageImageItemCallbackDelegate callback)
{
WPFDoEvents.AssertThisCodeIsRunningInTheUIThread();
// Utilities.LockPerfTimer l1_clk = Utilities.LockPerfChecker.Start();
lock (resized_page_image_item_requests)
{
// l1_clk.LockPerfTimerStop();
Logging.Debug("Queueing page redraw for {0}", page);
resized_page_image_item_requests[page] = new ResizedPageImageItemRequest
{
page = page,
page_control = page_control,
height = height,
width = width,
callback = callback
};
resized_page_image_item_request_orders.Add(page);
if (num_resized_page_image_item_thread_running < 1)
{
Interlocked.Increment(ref num_resized_page_image_item_thread_running);
ResizedPageImageItemThreadEntry();
}
}
}
public void GetResizedPageImage(PDFRendererPageControl page_control, int page, double height, ResizedPageImageItemCallbackDelegate callback)
{
lock (resized_page_image_item_requests)
{
//Logging.Debug("Queueing page redraw for {0}", page);
resized_page_image_item_requests[page] = new ResizedPageImageItemRequest
{
page = page,
page_control = page_control,
height = height,
callback = callback
};
resized_page_image_item_request_orders.Add(page);
if (num_resized_page_image_item_thread_running < 1)
{
Interlocked.Increment(ref num_resized_page_image_item_thread_running);
SafeThreadPool.QueueUserWorkItem(ResizedPageImageItemThreadEntry);
}
}
}
private void ResizedPageImageItemThreadEntry(object arg)
{
while (true)
{
ResizedPageImageItemRequest resized_page_image_item_request = null;
// Utilities.LockPerfTimer l1_clk = Utilities.LockPerfChecker.Start();
lock (resized_page_image_item_requests)
{
// l1_clk.LockPerfTimerStop();
// If there is nothing more to do...
if (0 == resized_page_image_item_request_orders.Count)
{
Interlocked.Decrement(ref num_resized_page_image_item_thread_running);
break;
}
// Get a piece of work
int page = resized_page_image_item_request_orders[resized_page_image_item_request_orders.Count - 1];
resized_page_image_item_request_orders.RemoveAt(resized_page_image_item_request_orders.Count - 1);
if (resized_page_image_item_requests.TryGetValue(page, out resized_page_image_item_request))
{
resized_page_image_item_requests.Remove(page);
}
else
{
continue;
}
}
Logging.Debug("Performing page redraw for {0}", resized_page_image_item_request.page);
// Check that the page is still visible
if (!resized_page_image_item_request.page_control.PageIsInView)
{
continue;
}
try
{
//PngBitmapDecoder decoder = new PngBitmapDecoder(new MemoryStream(pdf_document.PDFRenderer.GetPageByHeightAsImage(resized_page_image_item_request.page, resized_page_image_item_request.height)), BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.OnLoad);
//BitmapSource bitmap = decoder.Frames[0];
//bitmap.Freeze();
BitmapImage bitmap = new BitmapImage();
using (MemoryStream ms = new MemoryStream(pdf_document.PDFRenderer.GetPageByHeightAsImage(resized_page_image_item_request.page, resized_page_image_item_request.height)))
{
bitmap.BeginInit();
bitmap.StreamSource = ms;
bitmap.CacheOption = BitmapCacheOption.OnLoad;
bitmap.EndInit();
bitmap.Freeze();
}
if (null != bitmap)
{
resized_page_image_item_request.callback(bitmap, resized_page_image_item_request.height);
}
}
catch (Exception ex)
{
Logging.Error(ex, "There was an error while resizing a PDF page image");
}
}
}
