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) Executecompare_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