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| author | Allan Sandfeld Jensen <allan.jensen@theqtcompany.com> | 2016-08-24 15:19:43 +0200 |
|---|---|---|
| committer | Allan Sandfeld Jensen <allan.jensen@qt.io> | 2016-08-25 12:12:14 +0000 |
| commit | 68c2bf1a1ab9a9764658860827ffa4b5eacd0833 (patch) | |
| tree | 19c2f5280eef7ce719a231e822b9c79d79476329 /src/sql/drivers/mysql/qsql_mysql.cpp | |
| parent | 882f344964aae5ac4c03f18209ea6256be5ee0ed (diff) | |
Correct use of qt_div_255
qt_div_255 does a fast rounded division, the form of rounding is however
only valid for positive integers.
Correct one case where it was used incorrectly and add it one place
it would be valid, and adds a comment to the function.
We were using the optimization (x*a + y*(255-a))/255 ==
(x-y)*a/255 + y but that makes the division by 255 potentially
negative.
Change-Id: Ie53aa82b66ef801f5d43f8d2ec48880cb4972f69
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
Diffstat (limited to 'src/sql/drivers/mysql/qsql_mysql.cpp')
0 files changed, 0 insertions, 0 deletions