Add script for generating screenshots

.gitignore

@@ -18,3 +18,4 @@
 
 /_build
 .vscode
+screenshots/

README.md

@@ -149,6 +149,16 @@ $ ./regenerate-layouts.sh
 
 from the root of the repository.
 
+## Generating screenshots
+
+To generate screenshots in a variety of common sizes, build unl0kr and then run
+
+```
+$ sudo ./generate-screenshots _build/unl0kr
+```
+
+where `_build/unl0kr` is the location of the unl0kr binary. Note that you may have to adapt some of the settings inside the script depending on the device you're using to generate the screenshots.
+
 ## Screen recording
 
 For demonstration purposes you can record the framebuffer device, e.g. with ffmpeg:

generate-screenshots.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+
+# Change this depending on what device you're generating the screenshots on
+fb_res=1920x1080
+fb_depth=8
+fb_format=rgba
+
+unl0kr=$1
+outdir=screenshots
+
+resolutions=(
+    # Nokia N900
+    480x800
+    800x480
+    # Samsung Galaxy A3 2015
+    540x960
+    960x540
+    # Samsung Galaxy Tab A 8.0 2015
+    768x1024
+    1024x768
+    # Pine64 PineTab (landscape)
+    1280x800
+    # Pine64 PinePhone (landscape)
+    1440x720
+    # BQ Aquaris X Pro (landscape)
+    1920x1080 
+)
+
+if [[ ! -x $unl0kr ]]; then
+    echo "Error: Could not find unl0kr executable at $unl0kr" 1>&2
+    exit 1
+fi
+
+exec 1>/dev/null
+exec 2>/dev/null 
+
+rm -rf "$outdir"
+mkdir "$outdir"
+
+for res in ${resolutions[@]}; do
+    for theme in light dark; do
+        CRYPTTAB_SOURCE=/dev/sda1 $unl0kr -g $res -c unl0kr-screenshots.conf -C unl0kr-screenshots-$theme.conf &
+        pid=$!
+
+        sleep 2 
+
+        cat /dev/fb0 > "$outdir/$res"
+        convert -size $fb_res -depth $fb_depth $fb_format:"$outdir/$res" -crop $res+0+0 "$outdir/$theme-$res.png"
+        rm "$outdir/$res"
+        kill -9 $pid
+    done
+done

unl0kr-screenshots-dark.conf

@@ -0,0 +1,2 @@
+[theme]
+default=breezy-dark

unl0kr-screenshots-light.conf

@@ -0,0 +1,2 @@
+[theme]
+default=breezy-light

unl0kr-screenshots.conf

@@ -0,0 +1,10 @@
+[general]
+animations=true
+
+[keyboard]
+autohide=false
+layout=de
+popovers=true
+
+[textarea]
+obscured=true