push sheeet

pkgs/development/python-modules/invisible-watermark/tests/cli.nix

@@ -0,0 +1,67 @@
+{
+  image,
+  method,
+  invisible-watermark,
+  runCommand,
+  testName,
+  withOnnx,
+}:
+
+# This file runs one test case.
+# There are six test cases in total. method can have three possible values and
+# withOnnx two possible values. 3 * 2 = 6.
+#
+# The case where the method is rivaGan and invisible-watermark is built
+# without onnx is expected to fail and this case is handled accordingly.
+#
+# The test works by first encoding a message into a test image,
+# then decoding the message from the image again and checking
+# if the message was decoded correctly.
+
+let
+  message =
+    if method == "rivaGan" then
+      "asdf" # rivaGan only supports 32 bits
+    else
+      "fnörd1";
+  length = (builtins.stringLength message) * 8;
+  invisible-watermark' = invisible-watermark.override { inherit withOnnx; };
+  expected-exit-code = if method == "rivaGan" && !withOnnx then "1" else "0";
+in
+runCommand "invisible-watermark-test-${testName}" { nativeBuildInputs = [ invisible-watermark' ]; }
+  ''
+    set +e
+    invisible-watermark \
+      --verbose \
+      --action encode \
+      --type bytes \
+      --method '${method}' \
+      --watermark '${message}' \
+      --output output.png \
+      '${image}'
+    exit_code="$?"
+    set -euf -o pipefail
+    if [ "$exit_code" != '${expected-exit-code}' ]; then
+      echo "Exit code of invisible-watermark was $exit_code while ${expected-exit-code} was expected."
+      exit 1
+    fi
+    if [ '${expected-exit-code}' == '1' ]; then
+      echo 'invisible-watermark failed as expected.'
+      touch "$out"
+      exit 0
+    fi
+    decoded_message="$(invisible-watermark \
+                        --action decode \
+                        --type bytes \
+                        --method '${method}' \
+                        --length '${toString length}' \
+                        output.png \
+                      )"
+
+    if [ '${message}' != "$decoded_message" ]; then
+      echo "invisible-watermark did not decode the watermark correctly."
+      echo "The original message was ${message} but the decoded message was $decoded_message."
+      exit 1
+    fi
+    touch "$out"
+  ''

pkgs/development/python-modules/invisible-watermark/tests/python/decode.py

@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+
+import os
+import cv2
+from imwatermark import WatermarkDecoder
+
+input_file = os.environ['image']
+output_file_path = os.environ['out']
+num_bits = int(os.environ['num_bits'])
+method = os.environ['method']
+
+bgr = cv2.imread(input_file)
+
+decoder = WatermarkDecoder('bytes', num_bits)
+watermark = decoder.decode(bgr, method)
+message = watermark.decode('utf-8')
+
+with open(output_file_path, 'w') as f:
+    f.write(message)

pkgs/development/python-modules/invisible-watermark/tests/python/default.nix

@@ -0,0 +1,46 @@
+{
+  image,
+  invisible-watermark,
+  opencv4,
+  python,
+  runCommand,
+  stdenvNoCC,
+}:
+
+# This test checks if the python code shown in the README works correctly
+
+let
+  message = "fnörd1";
+  method = "dwtDct";
+
+  pythonWithPackages = python.withPackages (_: [
+    invisible-watermark
+    opencv4
+  ]);
+  pythonInterpreter = pythonWithPackages.interpreter;
+
+  encode = stdenvNoCC.mkDerivation {
+    name = "encode";
+    realBuilder = pythonInterpreter;
+    args = [ ./encode.py ];
+    inherit image message method;
+  };
+
+  decode = stdenvNoCC.mkDerivation {
+    name = "decode";
+    realBuilder = pythonInterpreter;
+    args = [ ./decode.py ];
+    inherit method;
+    image = "${encode}/test_wm.png";
+    num_bits = (builtins.stringLength message) * 8;
+  };
+in
+runCommand "invisible-watermark-test-python" { } ''
+  decoded_message="$(cat '${decode}')"
+  if [ '${message}' != "$decoded_message" ]; then
+    echo "invisible-watermark did not decode the watermark correctly."
+    echo "The original message was ${message} but the decoded message was $decoded_message."
+    exit 1
+  fi
+  touch "$out"
+''

pkgs/development/python-modules/invisible-watermark/tests/python/encode.py

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+# -*- coding: utf-8 -*-
+
+import os
+import cv2
+from imwatermark import WatermarkEncoder
+
+input_file_path = os.environ['image']
+output_dir = os.environ['out']
+message = os.environ['message']
+method = os.environ['method']
+
+os.mkdir(output_dir)
+
+bgr = cv2.imread(input_file_path)
+
+encoder = WatermarkEncoder()
+encoder.set_watermark('bytes', message.encode('utf-8'))
+bgr_encoded = encoder.encode(bgr, method)
+
+output_file = os.path.join(output_dir, 'test_wm.png')
+cv2.imwrite(output_file, bgr_encoded)