TRichView.com

I did not study these components, but I think it uses TRVReportHelper inside.
What if you assign its MetafileCompatibility property = True?

Sorry, I overlooked that the question was about ScaleRichView. But testing with TRichView may be useful. Please test with RichViewActions\Demos\DelphiUnicode\ActionTest\ demo. First, run File | Print by choosing the printer. Does it print? Next, check File | Print Preview. Does it display a preview?...

Thank you very much!
Yes, it looks like this critical section is not needed for applications that only receive video (since we already implemented av_lockmgr_register).
We need to test how this change affects recording.

If nothing is happens, this means that the standard TPrinter methods (BeginDoc, EndDoc, NewPage) do not work.
This means that standard Delphi/WinAPI methods do not work with this printer.
Probably, it's just not available...

Can a print preview be displayed?

It does not even print an empty page?

We will try to change thread priorities and to reduce count of memory allocations/deallocations.
Some time is needed for testing...

Do you mean how to paste HTML format from the Clipboard? When document is copied to the Clipboard in HTML format, not only HTML code but also a special header is copied. For example: Version:1.0 StartHTML:000000173 EndHTML:000000859 StartFragment:000000205 EndFragment:000000827 SourceURL:https://www...

See also: Does document contains an image?

This function returns True if the TRichView control contains only a plain text. function IsPlainText(rv: TCustomRichView): Boolean; var i, StyleNo, StyleNo2, ParaNo: Integer; s: TRVUnicodeString; begin // if empty, then returning True if rv.ItemCount = 0 then begin Result := True; exit; end; Result ...

I created a test project: https://www.trichview.com/support/files/CamTest3.zip It opens the specified URL in 3 cameras. For each camera, it displays the count of received frames per second, and the count of drawn frames per second. Numbers are updated each 3 seconds (so 3 seconds averages are shown)...

Visually, I cannot reproduce this problem.
I'll make a test showing camera FPS.

I created a demo:
https://www.trichview.com/forums/viewto ... f=3&t=9745

Actually, it is very simple: when the form DPI is changed, the demo re-applies the selected zooming percent.

This demo shows how to implement zooming in TRichView editor. zoomrv.zip Unlike RichViewActions\Demos\DelphiUnicode\ActionTest_MultiRes demo, in this demo: - zooming percent is displayed relative to the current monitor DPI (not relative to 96 DPI) - zooming percent is kept when the form's DPI is cha...

The code above renames items in the combobox, but it does not change the behavior: - if DocumentPixelsPerInch = 0, the editor keeps 100% zoom when the screen DPI is changed; - if DocumentPixelsPerInch > 0, its value is kept when the screen DPI is changed. (the screen DPI can be changed when the user...

No, DocumentPixelsPerInch is not stored in RVF.
No, you do not need to reset it before printing, exporting, or importing. It does not affect them.