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| author | Rhys Weatherley <rhys.weatherley@nokia.com> | 2009-09-21 04:23:49 (GMT) |
|---|---|---|
| committer | Rhys Weatherley <rhys.weatherley@nokia.com> | 2009-09-21 04:49:02 (GMT) |
| commit | 1e284a2970efdbf32b61db3cfb207eebf7f33d14 (patch) | |
| tree | 88cbd7a042dae8e2a8647ab2b491bd430fe9d207 /src/gui/widgets/qslider.cpp | |
| parent | 8db9f834e604c3a9eda8f76eacad2a9af20dbd33 (diff) | |
| download | Qt-1e284a2970efdbf32b61db3cfb207eebf7f33d14.zip Qt-1e284a2970efdbf32b61db3cfb207eebf7f33d14.tar.gz Qt-1e284a2970efdbf32b61db3cfb207eebf7f33d14.tar.bz2 | |
Performance: reduce overhead of updateMatrix() in GL2 paint engine
The original code was performing 40 floating-point multiplications,
40 additions, and 2 divisions every time the matrix was changed.
Because most of the components in the orthographic projection matrix
are trivial, we can implement the same transformation with only
6 multiplications, 6 additions, and 2 divisions.
Reviewed-by: Sarah Smith
Diffstat (limited to 'src/gui/widgets/qslider.cpp')
0 files changed, 0 insertions, 0 deletions