vectorimage: Load images directly from memory


The images have already been loaded when we call into the item
generator and we no longer need to store them temporarily on the
disk.

Change-Id: Idb10d0f78c5764716282862681863f1d368fcc7b
Reviewed-by: Kwanghyo Park <kwanghyo.park@qt.io>
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>
commit5fcde819f2aba847c47208f50635aecf5083e1e6
parented815acf4483cbbd376226da12bea8993d4eedf6
authorEskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>
committerEskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@qt.io>
commit timeThu, 22 Oct 2026 10:05:53 +0000