1 files changed, 71 insertions, 0 deletions
diff --git a/perf/img.sh b/perf/img.sh
new file mode 100755
index 00000000..5756d2aa
--- /dev/null
+++ b/perf/img.sh
@@ -0,0 +1,71 @@
+#!/usr/bin/env bash
+
+# Image viewer for terminals that support true colors.
+# Copyright (C) 2014  Egmont Koblinger
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along
+# with this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+if [ $# != 1 -o "$1" = "--help" ]; then
+  echo 'Usage: img.sh imagefile' >&2
+  exit 1
+elif [ -z $(type -p convert) ]; then
+  echo 'Please install ImageMagick to run this script.' >&2
+  exit 1
+fi
+
+# This is so that "upper" is still visible after exiting the while loop.
+shopt -s lastpipe
+
+COLUMNS=$(tput cols)
+
+declare -a upper lower
+upper=()
+lower=()
+
+convert -thumbnail ${COLUMNS}x "$1" txt:- |
+while IFS=',:() ' read col row dummy red green blue rest; do
+  if [ "$col" = "#" ]; then
+    continue
+  fi
+
+  if [ $((row%2)) = 0 ]; then
+    upper[$col]="$red;$green;$blue"
+  else
+    lower[$col]="$red;$green;$blue"
+  fi
+
+  # After reading every second image row, print them out.
+  if [ $((row%2)) = 1 -a $col = $((COLUMNS-1)) ]; then
+    i=0
+    while [ $i -lt $COLUMNS ]; do
+      echo -ne "\\e[38;2;${upper[$i]};48;2;${lower[$i]}m▀"
+      i=$((i+1))
+    done
+    # \e[K is useful when you resize the terminal while this script is still running.
+    echo -e "\\e[0m\e[K"
+    upper=()
+    d=()
+  fi
+done
+
+# Print the last half line, if required.
+if [ "${upper[0]}" != "" ]; then
+  i=0
+  while [ $i -lt $COLUMNS ]; do
+    echo -ne "\\e[38;2;${upper[$i]}m▀"
+    i=$((i+1))
+  done
+  echo -e "\\e[0m\e[K"
+fi