Re: anyone notice speed of 2.17.95 on Windows ?

[Keith OHara]

On Thu, 12 Dec 2013 23:07:19 -0800, Keith OHara <address@hidden> wrote:

> I am happy to say that I was wrong here.
>
> Open_type_font:: and Pango_font::name_to_index() each call FT_Get_Name_Index(). 
>  Inserting print statements to trace those calls I find that FT_Get_Name_Index 
> is called:
> 7 times for each character in a Tempo

I had failed to notice how the 'pure' calls to vertical-skylines are 
implemented.

Most properties, if directed to a callback function, have result of the 
callback function replace the pointer to that function.  This way the function 
does its job just once.

Sizes of spanners, that do depend on layout but are needed to evaluate potential 
layouts, are cached in Spanner::get_cached_pure_property() for each combination of 
'start' & 'end' columns that define the line of music on which they might 
appear.

If the property-lookup is 'pure' (tentative) then usually callback functions 
are not called.
Previously, functions providing stencils of objects whose shape does not depend 
on page-layout were on a pure-print-callback list, so their shapes could be 
used during layout decisions.

At the moment, there is an unpure-pure-container wrapper around the (expensive) 
function that builds skylines for text.  For some reason this allows repeated 
function calls to re-compute the property, even when the 'pure' and 'unpure' 
versions are the same.

Somewhere there should be a way to mark the skylines as "independent of layout" 
and the method should be used for vertical-skylines of text.