[geos-devel] Ability to preallocate the WKT stringstream buffer for really large geometries?

[Mats Taraldsvik]

Hi,

Generally, I'm very satisfied with the WKTWriter, which is really easy to use, and converts the Geometries to the WKT format. However, when converting _large_ geometries (in this case, contour lines), I get a major decrease in performance.

By looking at the source code (and profiling), I believe the use of a stringstream and hence a dynamically increasing string buffer, constantly reallocating, is causing the performance penalty. Possibly also copying the large string.

Is there anything I can do to improve this scenario? Do you accept contributions to fix this (e.g. passing in the expected size of the resulting WKT string)?

Regards

Mats Taraldsvik
mats.taraldsvik at norkart.no

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+47 67 55 14 00
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