[qt/qt/qtimageformats]: Summary of bulk changes made

Git repository change summary for qt/qt/qtimageformats
Pushed by mirror-service into branch '6.12'.
Changed from 53650c503799bb565ca4e3cc391bdc544a81171f to ead8edf67bc59c637ea8c45b8b79d6c5cbd0f52f
Acknowledgement was received that this change introduces only existing code that has been pushed to another public open source repository.

This change contains the following new commits:

Git commit b30c4dfc483e8462a5bcb123ad150eef3b3f5635 by Qt Cherry-pick Bot (on behalf of Eirik Aavitsland) on 15/08/2026 at 07:22..
Harden the MacHeif & MacJp2 handlers

- Respect QImageReader::allocationLimit()

- Avoid hypothetical qint64 overflow when seeking (harmless: would
  wrap to negative number which would just be rejected)

- Avoid potentially huge allocation when reading from serial devices
  (i.e. not files or data buffers)

- Avoid int overflow and garbage dpm values for nonsensical dpi
  metadata

Task-number: QTBUG-148333
Pick-to: 6.11 6.8 6.5 5.15
Change-Id: I1aecb807858c314655d009cc2630fb8ea0718117
Reviewed-by: Eskil Abrahamsen Blomfeldt <[email protected]>
(cherry picked from commit bdc673fac4dc993099f94fffb427e4f5d4d32ffe)
Reviewed-by: Qt Cherry-pick Bot <[email protected]>
https://invent.kde.org/qt/qt/qtimageformats/-/commit/b30c4dfc483e8462a5bcb123ad150eef3b3f5635

Git commit ead8edf67bc59c637ea8c45b8b79d6c5cbd0f52f by Qt Cherry-pick Bot (on behalf of Eirik Aavitsland) on 15/08/2026 at 07:22..
webp handler: Avoid uninitialized data in animation frames

Since webp animation frames may optionally cover only parts of the
image area, ensure that the whole QImage is initialized. This was
earlier done only for image formats with transparency.

This also fixes a shortcoming where uncovered areas in opaque formats
where expected to be filled with the defined background color.

Task-number: QTBUG-148332
Pick-to: 6.11 6.8 6.5 5.15
Change-Id: Ic606468cc2d30a31b65884c39bb80181d7e3aeb3
Reviewed-by: Eskil Abrahamsen Blomfeldt <[email protected]>
(cherry picked from commit 7901ddb71236867bf84ee56305561d12993e28da)
Reviewed-by: Qt Cherry-pick Bot <[email protected]>
https://invent.kde.org/qt/qt/qtimageformats/-/commit/ead8edf67bc59c637ea8c45b8b79d6c5cbd0f52f