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| author | Andreas Aardal Hanssen <andreas.aardal.hanssen@nokia.com> | 2009-06-17 09:36:40 (GMT) |
|---|---|---|
| committer | Andreas Aardal Hanssen <andreas.aardal.hanssen@nokia.com> | 2009-06-17 09:44:48 (GMT) |
| commit | fa8030a935acaacee570eee320e7510a4cfdc853 (patch) | |
| tree | 51d48d56c94739aa569bb60f5ef6998da35ff110 /examples/layouts | |
| parent | 24580f35a58390b4177aef8edef1192dc05f8ac2 (diff) | |
| download | Qt-fa8030a935acaacee570eee320e7510a4cfdc853.zip Qt-fa8030a935acaacee570eee320e7510a4cfdc853.tar.gz Qt-fa8030a935acaacee570eee320e7510a4cfdc853.tar.bz2 | |
Speed up QPixmap::width(), height(), isNull() and depth().
This change moves the w, h, d variables to QPixmapData and introduces
is_null to keep track of nullness. This is possible only because
QPixmapData is internal API; otherwise we'd have to be smarter.
The optimization makes the QPixmap::width() function take 7 instructions,
down from 34 before. For the calculator demo in the declarative ui branch
this reduces a block of 750000 instructions (out of 30000000) to around
100000-150000 instructions.
Tested on Windows, Linux, Mac. Raster, X11 and OpenGL paint engines. Have
not tested the DirectFB engine.
Reviewed-by: Trond
Diffstat (limited to 'examples/layouts')
0 files changed, 0 insertions, 0 deletions