Avoid double-buffering in QFile

Since Qt 4.3 QIODevice has been providing read buffering for buffered
devices; QFile provides a write buffer. Thus, requesting a buffered file
from the engine results in unnecessary double-buffering where this is
supported natively.

By preferring QFile/QIODevice's buffering over the file engine we reduce
the number of system calls.

On the other hand, buffering inside QIODevice can't easily be disabled
without changing the return value of QIODevice::openMode() (function is
non-virtual).

Reviewed-by: Thiago Macieira

0 files changed, 0 insertions, 0 deletions