Fixed watermark image appears upside down on iOS/macOS

[mas-paw]

When adding a fixed-position watermark in WeasyPrint, the image appears upside down only on iOS/macOS (Preview, Safari). It renders correctly on Windows/Linux (Adobe Reader, Chrome).

for example:

      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url("{{ MEDIA_URL }}image.png");
      background-repeat: no-repeat;
      background-attachment: fixed;
      background-position: center;
      background-origin: content-box;
      background-size: 80%;
      opacity: 0.09;

when i try to clear exif metadata before generate, its same result. what should i do ?

WeasyPrint version: 62.3
Python version: 3.12.0
iOS/macOS version: 13.x/ 13.x +

The issue may be related to EXIF metadata.
This does not happen when opening the PDF on Windows/Linux.
Tested with different images, same result.

[liZe]

Hi!

This does not happen when opening the PDF on Windows/Linux.

Unfortunately, Preview is know to have many, many small bugs we have to deal with. It could be useful to report the bug to Apple.

As a workaround, you can try to set the image on the page (with @page) instead of using a dedicate tag, and see if it helps.

when i try to clear exif metadata before generate, its same result. what should i do ?
Tested with different images, same result.

Then it’s probably not related to EXIF.