On Wed, Feb 10, 2016 at 1:25 AM, <spit...@gmail.com> wrote: > From: Bill Spitzak <spit...@gmail.com> > > If enable-gnuplot is configured, then you can pipe the output of a > pixman-using program > to gnuplot and get a continuously-updated plot of the horizontal filter. > This > works well with demos/scale to test the filter generation. > > The plot is all the different subposition filters shuffled together. This > is > misleading in a few cases: > > IMPULSE.BOX - goes up and down as the subfilters have different numbers > of non-zero samples > IMPULSE.TRIANGLE - somewhat crooked for the same reason > 1-wide filters - looks triangular, but a 1-wide box would be more > accurate > > v7: First time this ability was included > > v8: Use config option > Moved code to the filter generator > Modified scale demo to not call filter generator a second time. > > v10: Only print if successful generation of plots > Use #ifdef, not #if > > v11: small whitespace fixes > > Signed-off-by: Bill Spitzak <spit...@gmail.com> > Reviewed-by: Oded Gabbay <oded.gab...@gmail.com> >
This is an interesting idea. It may be worth having it compiled in at all times, but disabled unless a PIXMAN_GNUPLOT environment variable is set. There is one formatting issue with this patch: Pixman coding style requires a space before parentheses in function calls. Søren
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