how to render to DC with colored/transparent background?

[ukograhl]

Hi,

using latest version 10.5.2.395 of SimpleDLL Viewer SDK I try to render a PDF page not against a white page background (which works fine) but to a given colored background.

To do this instead of using PXCV_DrawPageToDC I tried it with PXCV_DrawPageToDIBSection but whatever color I set, I always get a white background (render flags are set to 0, so pxvrpf_NoTransparentBkgnd is no issue and also raster renderer is used).

So what am I doing wrong? Can you modify your sample app .\DelphiExamples\PDFXEditSimple\ so that the rendered page uses a red or blue page background?

In general: Can a colored or transparent background can be achieved also using PXCV_DrawPageToDC ? Best would be a way to get the page rendered above any arbitrary content of an existing DeviceContent, so any coloring or other background content will stay partially visible.


Thanks,
Ulrich

[Daniel - PDF-XChange]

Hello, ukograhl

Thank you for reaching out, I have informed our dev team of this case, and they will be looking into it as soon as they can. Unfortunately, I do not have an immediate answer I can provide you at the moment.

Just to clarify, you said you are using the version 10.5.2.395 of SimpleDLL Viewer SDK. Do you mean the "Editor Simple SDK" perchance? I don't believe the SimpleDLL Viewer SDK was ever updated beyond v2.5...

Also, if at all possible, could we request a snippet of the code running when you encounter such issues?

Kind regards,

[ukograhl]

Hello Daniel,

yes, Editor Simple SDK (using PDFXEditSimple.x64.dll) to render a PDF page.

Thanks!
Ulrich

[ukograhl]

Oh, forgot to add the code:

- open your Delphi sample application .\Examples\DelphiExamples\PDFXEditSimple\
- on MainFrame.pas edit procedure TForm1.PaintBox1Paint(Sender: TObject);

Code: Select all

procedure TForm1.PaintBox1Paint(Sender: TObject);
var
  Res: HResult;
  Param: PXV_CommonRenderParameters;

  // new:
  hBmp: HBitmap;
  Btmp: TBitmap;
begin
  if(m_pDocument = 0) then
    Exit;

  Param.WholePageRect := @m_rWholePage;
  if(m_bFitPage)then
	Param.DrawRect := nil
  else
	Param.DrawRect := @m_rDrawPage;

  Param.RenderTarget := 0;
  Param.Flags := 0;

  with m_rWholePage do
	PaintBox1.Canvas.Rectangle(Left - 1, Top - 1, Right + 1, Bottom + 1);

  // Original Code
	{Res := PXCV_DrawPageToDC(m_pDocument, m_nCurPage, PaintBox1.Canvas.Handle, @Param);
	ErrorCheck(Res);  }

  // Testcode background:
  Res := PXCV_DrawPageToDIBSection(m_pDocument, m_nCurPage, @Param, 0, $FF0000FF, @hbmp, 0, 0);
  ErrorCheck(Res);

  Btmp:= TBitmap.Create;
  try
    Btmp.Handle:=hBmp;
    PaintBox1.Canvas.Draw(m_rWholePage.Left, m_rWholePage.Top, btmp);
  finally
    Btmp.Free;
  end;
end;

Should'nt this create a red background?

[Daniel - PDF-XChange]

Hello, ukograhl

I believe you are correct, but I am not a Developer myself, so admittedly this does go a bit over my head.

I can confirm that we have a bug/investigation ticket in place for you on this issue now. Once that investigation is complete, you should see a reply here. For now, as with all tickets, this is an internal item, but the ticket number is as follows:

RT#7417: Delphi - Simple SDK - background color/transparency

I have added your code snippet to the notes as well, for quick access.

Kind regards,

[ukograhl]

Hello Daniel!

Thanks for looking on this problem. Will wait for the results.


kind regards,
Ulrich

[Stefan - PDF-XChange]