On Sun, May 08, 2005 at 21:31:21 +0200, Tobias Oetiker wrote:
> libart does not do anything 'expensive' before the gfx_render_png
> step ... you can verify this by creating eps output ... this is
> about 8 times faster than png output ...
> 
> so what you need to implement is
> 
> gfx_render_pnggd
Should have posted this earlier, but the results were so disappointing
that I never got around to it.
First of all, with gd + freetype the increase in speed was
insignificant (~10-15% or so) so I decided to use gd without freetype.
The downside of this is that it's not trivial (AFAIK) to support
arbitrary rotations of the text (and rotations that aren't even
multiples of 90 degrees look pretty bad), and --zoom will make the
text look disastrous, so it's not supported.

I did some benchmarking and the result is a 2x speedup or so, which
unfortunately isn't enough considering the downsides of the patch.

There's no patch of configure or docs, simpy because I don't see any
need for the patch to be included. Personally, I'll go with a patched
libart instead.

Btw, something I noticed with PNG output (that is, not GDPNG): if
background color has an alpha channel, the color information is
discarded (changes to white). For example, #ff000033 doesn't give you
semi-transparent red, it's semi-transparent gray. Feature or bug?

Also, it appears as if rrd_graph.c calculates the width of "M", but
rrd_graph_helper.c inserts an "m". Perhaps this fixes it (or maybe it
should be the other way around, "m" is probably not as high as "M",
even though the traditional em-space is the width of "M").

--- rrd_graph_helper.c.orig     2005-05-13 12:23:21.000000000 +0200
+++ rrd_graph_helper.c  2005-05-13 12:23:35.000000000 +0200
@@ -401,7 +401,7 @@
        (*eaten)--;
        linecp[*eaten]=' ';
        (*eaten)--;
-       linecp[*eaten]='m';
+       linecp[*eaten]='M';
 
        if (rrd_parse_legend(linecp, eaten, gdp)) err=1;



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