private void DisplayThumbnail()
{
ImageThumbnail.Source = null;
TxtAbstract.Text = "";
if (null == pdf_document)
{
return;
}
try
{
if (pdf_document.DocumentExists)
{
const double IMAGE_PERCENTAGE = 0.5;
using (MemoryStream ms = new MemoryStream(pdf_document.PDFRenderer.GetPageByHeightAsImage(page, ImageThumbnail.Height / IMAGE_PERCENTAGE)))
{
Bitmap image = (Bitmap)Image.FromStream(ms);
PDFOverlayRenderer.RenderAnnotations(image, pdf_document, page, specific_pdf_annotation);
PDFOverlayRenderer.RenderHighlights(image, pdf_document, page);
PDFOverlayRenderer.RenderInks(image, pdf_document, page);
image = image.Clone(new RectangleF {
Width = image.Width, Height = (int)Math.Round(image.Height * IMAGE_PERCENTAGE)
}, image.PixelFormat);
BitmapSource image_page = BitmapImageTools.CreateBitmapSourceFromImage(image);
ImageThumbnail.Source = image_page;
}
}
else
{
string abstract_text = pdf_document.Abstract;
if (PDFAbstractExtraction.CANT_LOCATE != abstract_text)
{
TxtAbstract.Text = abstract_text;
}
}
}
catch (Exception ex)
{
Logging.Error(ex, "There was a problem showing the PDF thumbnail");
}
if (null != ImageThumbnail.Source)
{
ImageThumbnail.Visibility = Visibility.Visible;
}
else
{
ImageThumbnail.Visibility = Visibility.Collapsed;
}
}
public static Image RenderAnnotation(PDFDocument pdf_document, PDFAnnotation pdf_annotation, float dpi)
{
Image image = Image.FromStream(new MemoryStream(pdf_document.PDFRenderer.GetPageByDPIAsImage(pdf_annotation.Page, dpi)));
PDFOverlayRenderer.RenderHighlights(image, pdf_document, pdf_annotation.Page);
PDFOverlayRenderer.RenderInks(image, pdf_document, pdf_annotation.Page);
// We rescale in the Drawing.Bitmap world because the WPF world uses so much memory
Image cropped_image = BitmapImageTools.CropImageRegion(image, pdf_annotation.Left, pdf_annotation.Top, pdf_annotation.Width, pdf_annotation.Height);
return(cropped_image);
}
public static Image RenderAnnotation(PDFDocument pdf_document, PDFAnnotation pdf_annotation, int dpi)
{
WPFDoEvents.AssertThisCodeIs_NOT_RunningInTheUIThread();
using (MemoryStream ms = new MemoryStream(pdf_document.GetPageByDPIAsImage(pdf_annotation.Page, dpi)))
{
Image image = Image.FromStream(ms);
PDFOverlayRenderer.RenderHighlights(image, pdf_document, pdf_annotation.Page);
PDFOverlayRenderer.RenderInks(image, pdf_document, pdf_annotation.Page);
// We rescale in the Drawing.Bitmap world because the WPF world uses so much memory
Image cropped_image = BitmapImageTools.CropImageRegion(image, pdf_annotation.Left, pdf_annotation.Top, pdf_annotation.Width, pdf_annotation.Height);
return(cropped_image);
}
}
public override DocumentPage GetPage(int page_zero_based)
{
// Hackity hack
WPFDoEvents.DoEvents();
if (null != last_document_page)
{
last_document_page.Dispose();
last_document_page = null;
}
int page = page_from + page_zero_based;
StatusManager.Instance.UpdateStatus("PDFPrinter", String.Format("Printing page {0} of {1}", page_zero_based + 1, this.PageCount), page_zero_based + 1, this.PageCount, true);
// Render a page at 300 DPI...
using (Image image = Image.FromStream(new MemoryStream(pdf_renderer.GetPageByDPIAsImage(page, 300))))
{
PDFOverlayRenderer.RenderAnnotations(image, pdf_document, page, null);
PDFOverlayRenderer.RenderHighlights(image, pdf_document, page);
PDFOverlayRenderer.RenderInks(image, pdf_document, page);
BitmapSource image_page = BitmapImageTools.CreateBitmapSourceFromImage(image);
image_page.Freeze();
DrawingVisual dv = new DrawingVisual();
using (DrawingContext dc = dv.RenderOpen())
{
// Rotate the image if its orientation does not match the printer
if (
page_size.Width < page_size.Height && image_page.Width > image_page.Height ||
page_size.Width > page_size.Height && image_page.Width < image_page.Height
)
{
image_page = new TransformedBitmap(image_page, new RotateTransform(90));
image_page.Freeze();
}
dc.DrawImage(image_page, new Rect(0, 0, page_size.Width, page_size.Height));
}
++total_pages_printed;
last_document_page = new DocumentPage(dv);
return(last_document_page);
}
}