[Poppler-bugs] [Bug 105796] New: Render a single annotation with Qt5 frontend

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105796

            Bug ID: 105796
           Summary: Render a single annotation with Qt5 frontend
           Product: poppler
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: qt frontend
          Assignee: poppler-bugs at lists.freedesktop.org
          Reporter: haxtibal at posteo.de

This is the Qt double of bug 83642. It adds Annotation::renderToImage() and
similar methods.

The patch series has following use cases in mind:
-show realistic preview of icons in readers
-WYSIWYG editing of free text annotations, e.g. typewriter
-paint annotations while dragging them around (render page is expensive)
-extract single annotations from PDF with a command line tool
-enable composition of annotations in readers; quite tricky, due to blend mode,
z-order and the ilk

Example usage:
...
  /* Generate image where annotation #0 is painted at offset (0,0) on
transparent background. */
  Poppler::Annotation* annot = pdfPage->annotations()[0];
  QImage img = annot->renderToImage(myDpiX, myDpiY);
...

I'd recommend to fix bug 105692 along with these patches, to get the size right
in all circumstances.

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