Created splash screen generator (#206)

Nice configurable splash screen generator, thanks Martijn Braam!

aports/postmarketos-splash/APKBUILD

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+pkgname=postmarketos-splash
+pkgver=1
+pkgrel=0
+pkgdesc="Splash screen for postmarketOS"
+url="https://github.com/postmarketos"
+arch="all"
+license="mit"
+depends="ttf-dejavu py3-pillow"
+makedepends=""
+install=""
+subpackages=""
+source="make-splash.py config.ini"
+
+build() {
+	return 0
+}
+
+package() {
+	install -D -m755 "$srcdir"/make-splash.py \
+                "$pkgdir"/usr/bin/pmos-make-splash
+	install -D -m644 "$srcdir"/config.ini \
+		"$pkgdir"/etc/postmarketos/splash.ini
+}
+
+sha512sums="5a89cdaeec572262ae48248a0c92721bd53e40ddf83167be3ede6fef656e540f6f3cf8eac3d17ae9755ab523a69f760732d05b0de436347ed91272ca732ac938  make-splash.py
+b5f7b6268119d835bded30acd1a57d171be2c9dde21f2566f7f231de88490d91576ec97f60a17f7fbfc1aa0e2310030b2d056117c8ebbba84caae02be46610fb  config.ini"

aports/postmarketos-splash/config.ini

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+[background]
+color=#000
+
+[name]
+text=postmarketOS
+font=/usr/share/fonts/TTF/Roboto-Light.ttf
+color=#fff
+
+[logo]
+text=♻
+font=/usr/share/fonts/TTF/DejaVuSans.ttf
+color=#090
+
+[text]
+font=/usr/share/fonts/TTF/Roboto-Light.ttf
+color=#999

aports/postmarketos-splash/make-splash.py

@@ -0,0 +1,113 @@
+#!/usr/bin/env python3
+from PIL import Image, ImageFont, ImageDraw
+import configparser
+import os
+import sys
+
+
+def make_splash(width, height, filename, landscape=False, text="", config_file=None, center=False):
+    print("Creating {}x{} splashscreen".format(width, height))
+
+    config = configparser.ConfigParser()
+    if config_file is not None:
+        config.read(config_file)
+
+    im = Image.new('RGB', (width, height), color=config.get('background', 'color', fallback=0))
+    draw = ImageDraw.Draw(im)
+
+    font_size = int(width / 13)
+    logo_size = int(width / 10)
+    text_size = int(width / 30)
+
+    name = config.get('name', 'text', fallback='postmarketOS')
+    logo = config.get('logo', 'text', fallback='♻')
+
+    name_font = check_font(config, 'name')
+    logo_font = check_font(config, 'logo')
+    text_font = check_font(config, 'text')
+
+    name_font = ImageFont.truetype(name_font, font_size)
+    logo_font = ImageFont.truetype(logo_font, logo_size)
+    text_font = ImageFont.truetype(text_font, text_size)
+
+    name_width, name_height = draw.textsize(name, font=name_font)
+    logo_width, logo_height = draw.textsize(logo, font=logo_font)
+
+    draw.text(((width - (name_width + logo_width)) / 2 + logo_width, (height - name_height) / 2), name,
+              config.get('name', 'color', fallback='#ffffff'), font=name_font)
+
+    draw.text(((width - (name_width + logo_width)) / 2, (height - name_height) / 2), logo,
+              config.get('logo', 'color', fallback='#009900'),
+              font=logo_font)
+
+    if text != "" and text is not None:
+
+        text_top = (height / 2) + name_height
+        _, line_height = draw.textsize('A', font=text_font)
+        text_left = width * 0.05
+        for hardcoded_line in text.replace("\\n", "\n").splitlines():
+            lines = visual_split(hardcoded_line, text_font, width * 0.9)
+            for line in lines:
+
+                if center:
+                    line_width, _ = draw.textsize(line, font=text_font)
+                    text_left = (width / 2) - (line_width / 2)
+
+                draw.text((text_left, text_top), line, fill=config.get('text', 'color', fallback='#cccccc'),
+                          font=text_font)
+                text_top += line_height + (text_size * 0.4)
+
+    del draw
+    im.save(filename, format='PPM')
+
+
+def check_font(config, section):
+    fallback_font = '/usr/share/fonts/ttf-dejavu/DejaVuSans.ttf'
+    font_file = config.get(section, 'font', fallback=fallback_font)
+    if not os.path.isfile(font_file):
+        print("Font file '{}' does not exist ({}).".format(font_file, section), file=sys.stderr)
+        exit(1)
+    return font_file
+
+
+def visual_split(text, font, width, response_type='list'):
+    font = font
+    words = text.split()
+
+    word_lengths = [(word, font.getsize(word)[0]) for word in words]
+    space_length = font.getsize(' ')[0]
+
+    lines = ['']
+    line_length = 0
+
+    for word, length in word_lengths:
+
+        if line_length + length <= width:
+            lines[-1] = '{line}{word} '.format(line=lines[-1], word=word)
+            line_length += length + space_length
+        else:
+            lines.append('{word} '.format(word=word))
+            line_length = length + space_length
+
+    if response_type == 'list':
+        return [line.strip() for line in lines]
+    elif response_type == 'str':
+        return '\n'.join(line.strip() for line in lines)
+    else:
+        raise ValueError('Invalid response type. Valid values are "list" and "str".')
+
+
+if __name__ == '__main__':
+    import argparse
+
+    parser = argparse.ArgumentParser(description="Splash generator for postmarketOS")
+    parser.add_argument('width', type=int)
+    parser.add_argument('height', type=int)
+    parser.add_argument('filename')
+    parser.add_argument('--landscape', action='store_true', help='Rotate splash screen for landscape device')
+    parser.add_argument('--text', type=str, help='Additional text for the splash screen')
+    parser.add_argument('--center', action='store_true', help='Center text')
+    parser.add_argument('--config', type=str, help='Config file for splash screen style')
+    args = parser.parse_args()
+
+    make_splash(args.width, args.height, args.filename, args.landscape, args.text, args.config, args.center)