Just checking again if anyone has any knowledge of this? As far as I can see, plsave_set_locale and plrestore_locale temporarily set the LC_NUMERIC locale to "C" during calls to the driver. This sets the decimal delimiter and the thousands separator and how many digits are between the thousands separator.
I really can see no use at all to do this for a fill call or most of the other calls where it is used. Do some drivers convert numbers to text during their rendering? I have just tested and I get a 50% speed increase for my shades calls by removing the locale calls from grfill. This seems pretty significant. Thanks Phil On Mon, 29 May 2023 at 00:38, Phil Rosenberg <p.d.rosenb...@gmail.com> wrote: > Hi all > I have been making further optimisations to the wxwidgets backen, as I > have still been finding it painfully slow for plshade calls. > It turned out that almost all the time within the backend (>99%) was spent > selecting pens and brushes and allocating memory for every fill within the > plshade call. Less that 1% was actually spent within the rendering call to > wxWidgets. I have made some good improvements here. > > However, in addition to this, about 50% of the total execution time is > spent in the setlocale function. This is called before and after each > polygon fill in the core plplot code. > > I wondered if anyone really knows the purpose of these calls? Perhaps they > are to ensure we have consistent numeric representations across regions? If > so, then I don't really understand why they are needed for polygon fills. > > Any thoughts would be welcome > Phil >
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