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| author | Donald Carr <donald.carr@nokia.com> | 2010-08-12 18:43:51 (GMT) |
|---|---|---|
| committer | Donald Carr <donald.carr@nokia.com> | 2010-08-12 18:45:29 (GMT) |
| commit | 5478ba712afeb11768016d05bef975a5a48ae059 (patch) | |
| tree | 086dab859afdc6f7b904a03ff2bae634a920e927 /doc | |
| parent | 677b96b3bfcbccae978f0d63f7e16a35783c0eec (diff) | |
| download | Qt-5478ba712afeb11768016d05bef975a5a48ae059.zip Qt-5478ba712afeb11768016d05bef975a5a48ae059.tar.gz Qt-5478ba712afeb11768016d05bef975a5a48ae059.tar.bz2 | |
Clean up rasterfallback mechanism in DirectFB
Being able to debug which paint operations are slow with Qt/DirectFB is
currently only possible in debug builds (which defeats the purpose
somewhat) or by frequent recompilation (with different defines).
This patch cleans up the mechanism somewhat and makes it available in
release builds as well.
The overhead is a single int comparison so it really isn't a performance
issue to have this code in place at all times.
Reviewed-by: Anders Bakken <agbakken@gmail.com>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/src/platforms/emb-directfb-EmbLinux.qdoc | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/doc/src/platforms/emb-directfb-EmbLinux.qdoc b/doc/src/platforms/emb-directfb-EmbLinux.qdoc index 955258e..f416819 100644 --- a/doc/src/platforms/emb-directfb-EmbLinux.qdoc +++ b/doc/src/platforms/emb-directfb-EmbLinux.qdoc @@ -153,6 +153,17 @@ manufacturer to manufacture, different operations will be optimized. This require you to define the operations you want to warn about or disable. These are listed above in the DIRECTFB_DRAWINGOPERATIONS variable. +You can also customize this with environment variables. + +E.g. If you want to disable fallbacks for drawPixmap and fillRect and also get +a warning printed on stderr when a fallback would have happened. + +\code +$ export QT_DIRECTFB_WARN_ON_RASTERFALLBACKS="FILL_RECT|DRAW_PIXMAP" +$ export QT_DIRECTFB_DISABLE_RASTERFALLBACKS="FILL_RECT|DRAW_PIXMAP" +$ ./app -qws -display directfb +\endcode + Following is a table showing which options you have. \table |