Add rendering for graphics used externally (e.g., support chat avatar)

.gitignore

@@ -7,3 +7,4 @@ CMakeLists.txt.*
 build*
 .kdev4/
 *.kdev4
+support-chat-avatar.png

render-graphics.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+
+# SPDX-FileCopyrightText: 2023 Melvin Keskin <[email protected]>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+QXMPP_SOURCES=$(dirname "$(readlink -f "${0}")")
+
+echo "*****************************************"
+echo "Rendering graphics"
+echo "*****************************************"
+
+render_support_chat_avatar() {
+    render_svg_with_margin $QXMPP_SOURCES/logo.svg $QXMPP_SOURCES/support-chat-avatar.png 300 300 18
+}
+
+# $1 - $4: see render_svg()
+# $5: margin
+render_svg_with_margin() {
+    output_directory=$(dirname $2)
+    mkdir -p $output_directory
+    tmp_file=$output_directory/rendered_tmp.svg
+    inkscape -o $tmp_file --export-margin=$5 $1
+    render_svg $tmp_file $2 $3 $4
+    rm $tmp_file
+}
+
+# $1: input file
+# $2: output file
+# $3: width
+# $4: height
+render_svg() {
+    inkscape -o $2 -w $3 -h $4 $1 >/dev/null
+    optipng -quiet -o7 $2 >/dev/null
+    advpng -z4 $2 >/dev/null
+    echo "Created "$2
+}
+
+render_support_chat_avatar