QImage: merge the size calculations with proper (non-UB) checks

This check, which was only done once, was wrong:
    const int bytes_per_line = ((width * depth + 31) >> 5) << 2;

    // sanity check for potential overflows
    if (std::numeric_limits<int>::max()/depth < width

If width*height overflows, then it's already UB and checking afterwards
with a division is pointless and slow.

The other instances weren't properly guarding against overflows.

Change-Id: I343f2beed55440a7ac0bfffd1563350d4cfa639c
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

0 files changed, 0 insertions, 0 deletions