Add adoc generator for speed test.

Signed-off-by: Stefan Westerfeld <stefan@space.twc.de>

src/gen-speed-adoc.sh

+#!/bin/bash
+
+STRENGTHS="10 15"
+CLIPS="15 30"
+
+echo ".watermarking-speed"
+echo '[frame="topbot",options="header",cols="<1,3*<"]'
+echo '|=========================='
+
+echo -n "| Strength "
+for CLIP in $CLIPS
+do
+  echo -n "| 0:$CLIP"
+done
+echo -n "| 2:45"
+echo
+
+for STRENGTH in $STRENGTHS
+do
+  echo -n "| $STRENGTH "
+  for CLIP in $CLIPS
+  do
+    cat speed-$CLIP-$STRENGTH-* | awk '{bad += $1; n += $2} END {if (n==0) n=1;fer=100.0*bad/n; bold=fer>0?"*":" ";printf ("| %s%.2f%s", bold, fer, bold)}'
+  done
+  for FULL in speed-$STRENGTH-*
+  do
+    if [ "$(echo $FULL | tr -d a-z0-9)" == "--" ]; then
+      cat $FULL
+    fi
+  done | awk '{bad += $1; n += $2} END {if (n==0) n=1;fer=100.0*bad/n; bold=fer>0?"*":" ";printf ("| %s%.2f%s", bold, fer, bold)}'
+  echo
+done
+echo '|=========================='