Compare Goldens

This is a script that will let you check golden image diffs locally.

The directories are scanned for png files that match in name, then the diff is written to diff_<name of file> in the CWD. This allows you to get results quicker than having to upload to skia gold. By default it uses fuzzy RMSE to compare.

Usage

dart run compare_goldens <dir path> <dir path>

Here's the steps for using this with something like impeller golden tests:

1. Checkout a base revision
2. Build impeller_golden_tests
3. Execute `impeller_golden_tests --working_dir=<path a>
4. Checkout test revision
5. Build impeller_golden_tests
6. Execute `impeller_golden_tests --working_dir=<path b>
7. Execute `compare_goldens <path a> <path b>

Requirements

• ImageMagick is installed on $PATH

Testing

To run the tests:

dart pub get
find . -name "*_test.dart" | xargs -n 1 dart --enable-asserts