/**
@mainpage The Poppler Qt6 interface library

The %Poppler Qt6 interface library, libpoppler-qt6, is a library that
allows Qt6 programmers to easily load and render PDF files. The
%Poppler Qt6 interface library uses poppler internally to do its job,
but the Qt6 programmer will never have to worry about poppler
internals.


@section help Current Status

The %Poppler Qt6 interface library is quite stable and working.

@section refimpl Example Programs

Examples programs can be found in the qt6/test directory. The %Poppler
Qt6 interface library is also used in the KDE's
document viewer <a href="http://okular.kde.org">Okular</a>. The source files
for Okular's PDF plugin (%Poppler-based) can be found on the git server
of the KDE project, under
<a
href="http://quickgit.kde.org/?p=okular.git&a=tree&f=generators/poppler">this
URL</a>.


@section req How to use the Poppler Qt6 interface library in three easy steps

Programmer who would like to use the %Poppler Qt6 interface library
simply need to add the following line to their C++ source files:

@code
#include <poppler-qt6.h>
@endcode


For using the Qt6 interface on Android, there is an additional step - you must place the following font files in the assets/share/fonts directory of the Android APK:

  - NimbusMonoPS-Regular.otf
  - NimbusMonoPS-Bold.otf
  - NimbusMonoPS-BoldItalic.otf
  - NimbusMonoPS-Italic.otf
  - NimbusSans-Regular.otf
  - NimbusSans-Bold.otf
  - NimbusSans-BoldItalic.otf
  - NimbusSans-Italic.otf
  - StandardSymbolsPS.otf
  - NimbusRoman-Bold.otf
  - imbusRoman-BoldItalic.otf
  - NimbusRoman-Italic.otf
  - NimbusRoman-Regular.otf
  - D050000L.otf

These are used as substitute fonts for the base-14 fonts, and this step is required in order to reliably display documents with unembedded fonts. You can easily find these font files included within GhostScript.

A PDF document can then be loaded as follows:
@code
QString filename;

std::unique_ptr<Poppler::Document> document = Poppler::Document::load(filename);
if (!document || document->isLocked()) {

  // ... error message ....

  return;
}
@endcode

Pages can be rendered to QImages with the following commands:

@code
// Paranoid safety check
if (!document) {
  // ... error message ...
  return;
}

// Access page of the PDF file
std::unique_ptr<Poppler::Page> pdfPage = document->page(pageNumber);  // Document starts at page 0
if (!pdfPage) {
  // ... error message ...
  return;
}

// Generate a QImage of the rendered page
QImage image = pdfPage->renderToImage(xres, yres, x, y, width, height);
if (image.isNull()) {
  // ... error message ...
  return;
}

// ... use image ...

// after the usage, the page must be deleted
@endcode

Finally, don't forget to destroy the document:

@code
delete document;
@endcode
 */