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| author | Michael Brasser <michael.brasser@nokia.com> | 2010-07-09 01:33:56 (GMT) |
|---|---|---|
| committer | Michael Brasser <michael.brasser@nokia.com> | 2010-07-09 01:33:56 (GMT) |
| commit | 0c56bef89b6e3fe4c9fb32eb8b51a6ea316a89fa (patch) | |
| tree | 171fc686b4f6cb66b7b98cc23c5662784497efd9 /doc/src/snippets | |
| parent | fb89f24ec1c799ed23ed5ee566e6d5d78122fc46 (diff) | |
| download | Qt-0c56bef89b6e3fe4c9fb32eb8b51a6ea316a89fa.zip Qt-0c56bef89b6e3fe4c9fb32eb8b51a6ea316a89fa.tar.gz Qt-0c56bef89b6e3fe4c9fb32eb8b51a6ea316a89fa.tar.bz2 | |
Optimize text layout.
When laying out text, a significant amount of time was being spent
querying for the font engine. This patch:
* changes the layout to only query for the engine when a new script item
is encountered.
* adds an internal cache of the previous result to
QTextEngine::fontEngine(). This catches the important case of multiline
text with few font engine changes.
With these changes layout costs are now approximately 60% of what they
were previously, as measured by the text layout benchmarks.
Reviewed-by: Eskil Abrahamsen Blomfeldt
Diffstat (limited to 'doc/src/snippets')
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