Add script to generate PNG images for Android

1 files changed, 88 insertions, 0 deletions

diff --git a/android/generate-pngs.sh b/android/generate-pngs.sh
new file mode 100755
index 0000000000..59735a24d9
--- /dev/null
+++ b/android/generate-pngs.sh
@@ -0,0 +1,88 @@
+#!/usr/bin/env bash
+
+set -eu
+
+if ! command -v rsvg-convert > /dev/null; then
+    echo >&2 "rsvg-convert (librsvg) is required to run this script"
+    exit 1
+fi
+
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+cd "$SCRIPT_DIR"
+
+# The following helper function converts an SVG image into a PNG image for a specific DPI
+#
+# Parameters:
+#   1. Path to source SVG image
+#   2. DPI config, a string with two or three parameters separated by '-'s
+#      a. the DPI specification, as the suffix of the output directory (e.g., mdpi, xxhdpi)
+#      b. the width of the generated PNG image
+#      c. (optional) the height of the generated PNG image, if not specified it is assumed to be the
+#         same as the width in order to output a square image
+#   3. (optional) The destination image name, if not specified it is assumed to be the same as the
+#      input image name, with any '-'s replaced with '_'s
+#   4. (optional) Destination directory type, either 'drawable' (the default) or 'mipmap'
+#
+# Examples:
+#
+# The following will generate a 50 by 50 image in android/src/main/res/drawable-hdpi/my_image.png
+#
+#     convert_image /tmp/my-image.svg hdpi-50
+#
+# The following will generate a 50 by 50 image in android/src/main/res/drawable-mdpi/other_image.png
+#
+#     convert_image /tmp/my-other-image.svg mdpi-50 other_image
+#
+# The following will generate a 50 by 25 image in android/src/main/res/mipmap-xxhdpi/my_icon.png
+#
+#     convert_image /tmp/my-final-image.svg xxhdpi-50-25 my_icon mipmap
+function convert_image() {
+    if (( $# < 2 )); then
+        echo "Too few arguments passed to 'convert_image'" >&2
+        exit 1
+    fi
+
+    local source_image="$1"
+    local dpi_config="$2"
+
+    if (( $# >= 3 )); then
+        local destination_image="$3"
+    else
+        local destination_image="$(basename "$source_image" .svg | sed -e 's/-/_/g')"
+    fi
+
+    if (( $# >= 4 )); then
+        local destination_dir="$4"
+    else
+        local destination_dir="drawable"
+    fi
+
+    local dpi="$(echo "$dpi_config" | cut -f1 -d'-')"
+    local width="$(echo "$dpi_config" | cut -f2 -d'-')"
+    local height="$(echo "$dpi_config" | cut -f3 -d'-')"
+
+    if [ -z "$height" ]; then
+        local height="$width"
+    fi
+
+    local dpi_dir="./src/main/res/${destination_dir}-${dpi}"
+
+    echo "$source_image -> ($width x $height) ${dpi_dir}/${destination_image}.png"
+    mkdir -p "$dpi_dir"
+    rsvg-convert "$source_image" -w "$width" -h "$height" -o "${dpi_dir}/${destination_image}.png"
+}
+
+# Launcher icon
+for dpi_size in "mdpi-48" "hdpi-72" "xhdpi-96" "xxhdpi-144" "xxxhdpi-192"; do
+    convert_image "../dist-assets/icon.svg" "$dpi_size" "ic_launcher" "mipmap"
+done
+
+# Logo used in some GUI areas
+for dpi_size in "mdpi-50" "hdpi-75" "xhdpi-100" "xxhdpi-150" "xxxhdpi-200"; do
+    convert_image "../dist-assets/icon.svg" "$dpi_size" "logo_icon"
+done
+
+# Large logo used in the launch screen
+for dpi_size in "mdpi-120" "hdpi-180" "xhdpi-240" "xxhdpi-360" "xxxhdpi-480"; do
+    convert_image "../dist-assets/icon.svg" "$dpi_size" "launch_logo"
+done