data: Import 2 photos and generate grayscale images

Import the jpegs files, taken from my camera:
  grass-2014x1536.jpg
  pink-leaves-3264x2448.jpg

Use ImageMagick at buildtime to generate grayscale PNG images from the
JPEG files.  Generate an image for each miplevel, beginning with the
base level extent 2048x1024.

Images will be used to fill depth and stencil miptrees.

1 files changed, 58 insertions, 0 deletions

diff --git a/misc/gen_image b/misc/gen_image
new file mode 100755
index 0000000..f9d6f5e
--- /dev/null
+++ b/misc/gen_image
@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+
+import argparse
+import os
+import re
+import sys
+
+from subprocess import check_call
+
+PROG_NAME = os.path.basename(sys.argv[0])
+
+def die(msg):
+    print('{}: error: {}'.format(PROG_NAME, msg), file=sys.stderr)
+    sys.exit(1)
+
+def parse_args():
+    p = argparse.ArgumentParser()
+    p.add_argument('--convert-tool', default='convert')
+    p.add_argument('-d', '--debug', action='store_true')
+    p.add_argument('src_filename')
+    p.add_argument('dest_filename')
+    return p.parse_args()
+
+def main():
+    args = parse_args()
+
+    src_filename = args.src_filename
+    dest_filename = args.dest_filename
+
+    # The badly named "convert" tool is an ImageMagick tool.
+    convert_args = [args.convert_tool, src_filename]
+
+    if re.search('grayscale', dest_filename):
+        convert_args += [
+            '-set', 'colorspace', 'Gray',
+            '-separate',
+            '-average',
+        ]
+
+    match = re.search(r'(\d+)x(\d+)', dest_filename)
+    if match is None:
+        die('dest_filename {!r} contains no size'.format(dest_filename))
+
+    width = match.groups(0)[0]
+    height = match.groups(0)[1]
+
+    convert_args += [
+        '-adaptive-resize', '{}x{}'.format(width, height),
+        dest_filename,
+    ]
+
+    if args.debug:
+        print('run: ' + ' '.join(map(repr, convert_args)))
+
+    check_call(convert_args)
+
+if __name__ == '__main__':
+    main()