Add previews.

README.adoc

@@ -12,6 +12,12 @@ commit is the file `gentoo-cursors-tad-0.3.1.tar.bz2` from the Gentoo
 mirrors. If you have the source files used to generate the cursors, please get
 in touch.
 
+== Previews
+
+image:preview_gentoo.png[]
+image:preview_gentoo-blue.png[]
+image:preview_gentoo-silver.png[]
+
 == Install
 
 === Gentoo

misc/create_previews.sh

@@ -0,0 +1,37 @@
+#!/bin/sh
+# Generate previews from cursors.
+
+if ! command -v xcur2png > /dev/null; then
+    echo "You need to install xcur2png." >&2
+    exit 1
+fi
+
+if ! command -v montage > /dev/null; then
+    echo "You need to install montage from imagemagick." >&2
+    exit 1
+fi
+
+for theme in gentoo gentoo-blue gentoo-silver; do
+    mkdir -p _create_preview.sh_tmp/png/
+    mkdir _create_preview.sh_tmp/unique/
+
+    find cursors/${theme}/cursors/* -type f -exec \
+         xcur2png -d _create_preview.sh_tmp/png/ -c - {} \;
+
+    for png in $(file _create_preview.sh_tmp/png/* | grep 48 | cut -d: -f1); do
+        cp "${png}" _create_preview.sh_tmp/unique/
+    done
+
+    rm -f _create_preview.sh_tmp/unique/left_ptr_watch_02[012356789]*
+    rm -f _create_preview.sh_tmp/unique/left_ptr_watch_03*
+    rm -f _create_preview.sh_tmp/unique/left_ptr_watch_1*
+
+    rm -f _create_preview.sh_tmp/unique/znurt_03[012345679]*
+    rm -f _create_preview.sh_tmp/unique/znurt_04*
+    rm -f _create_preview.sh_tmp/unique/znurt_1_*
+
+    montage _create_preview.sh_tmp/unique/* \
+            -geometry 48x48+4+4 -background 'transparent' preview_${theme}.png
+
+    rm -rf _create_preview.sh_tmp/
+done