[frameworks/kimageformats/Frameworks/6.28] src/imageformats: HEIF: keep reader callback table alive

Git commit ac374da215eb30d67355be00c89a73c06fea8ae8 by Nicolas Fella, on behalf of Kyle Alexander Buan.
Committed on 20/07/2026 at 18:52.
Pushed by nicolasfella into branch 'Frameworks/6.28'.

HEIF: keep reader callback table alive

libheif retains the heif_reader pointer after
heif_context_read_from_reader returns. The callback table was scoped
to the non-sequential branch and could be destroyed before
tiled image decoding used it from worker threads.

Give the callback table static storage duration.

BUG: 523105
(cherry picked from commit ad0fb9dde4ffb1977a3ea800d90a26665de687b8)

M  +2    -1    src/imageformats/heif.cpp

https://invent.kde.org/frameworks/kimageformats/-/commit/ac374da215eb30d67355be00c89a73c06fea8ae8

diff --git a/src/imageformats/heif.cpp b/src/imageformats/heif.cpp
index 7b96aa96..73bd6822 100644
--- a/src/imageformats/heif.cpp
+++ b/src/imageformats/heif.cpp
@@ -711,7 +711,8 @@ bool HEIFHandler::ensureDecoder()
         buffer = deviceRead(dev, kMaxQVectorSize);
         err = heif_context_read_from_memory(ctx, static_cast<const void *>(buffer.constData()), buffer.size(), nullptr);
     } else {
-        heif_reader reader = create_heif_reader_for_qiodevice();
+        // Must not be destroyed until decoding ends
+        static const heif_reader reader = create_heif_reader_for_qiodevice();
         err = heif_context_read_from_reader(ctx, &reader, dev, nullptr);
     }
     if (err.code) {