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-rw-r--r--gerbonara/gerber/tests/image_support.py63
1 files changed, 63 insertions, 0 deletions
diff --git a/gerbonara/gerber/tests/image_support.py b/gerbonara/gerber/tests/image_support.py
new file mode 100644
index 0000000..ee8e6b9
--- /dev/null
+++ b/gerbonara/gerber/tests/image_support.py
@@ -0,0 +1,63 @@
+import subprocess
+from pathlib import Path
+import tempfile
+
+import numpy as np
+
+class ImageDifference(float):
+ def __init__(self, value, ref_path, out_path):
+ super().__init__(value)
+ self.ref_path, self.out_path = ref_path, out_path
+
+def run_cargo_cmd(cmd, args, **kwargs):
+ if cmd.upper() in os.environ:
+ return subprocess.run([os.environ[cmd.upper()], *args], **kwargs)
+
+ try:
+ return subprocess.run([cmd, *args], **kwargs)
+
+ except FileNotFoundError:
+ return subprocess.run([str(Path.home() / '.cargo' / 'bin' / cmd), *args], **kwargs)
+
+def svg_to_png(in_svg, out_png):
+ run_cargo_cmd('resvg', [in_svg, out_png], check=True, stdout=subprocess.DEVNULL)
+
+def gbr_to_svg(in_gbr, out_svg):
+ cmd = ['gerbv', '-x', 'svg',
+ '--border=0',
+ #f'--origin={origin_x:.6f}x{origin_y:.6f}', f'--window_inch={width:.6f}x{height:.6f}',
+ '--foreground=#ffffff',
+ '-o', str(out_svg), str(in_gbr)]
+ subprocess.run(cmd, check=True, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+
+def gerber_difference(reference, actual):
+ with tempfile.NamedTemporaryFile(suffix='.svg') as out_svg,\
+ tempfile.NamedTemporaryFile(suffix='.svg') as ref_svg:
+
+ gbr_to_svg(reference, ref_svg.name)
+ gbr_to_svg(actual, act_svg.name)
+
+ diff = svg_difference(ref_svg.name, act_svg.name)
+ diff.ref_path, diff.act_path = reference, actual
+ return diff
+
+def svg_difference(reference, actual):
+ with tempfile.NamedTemporaryFile(suffix='.png') as ref_png,\
+ tempfile.NamedTemporaryFile(suffix='.png') as act_png:
+
+ svg_to_png(reference, ref_png.name)
+ svg_to_png(actual, act_png.name)
+
+ diff = image_difference(ref_png.name, act_png.name)
+ diff.ref_path, diff.act_path = reference, actual
+ return diff
+
+def image_difference(reference, actual):
+ ref = np.array(Image.open(reference)).astype(float)
+ out = np.array(Image.open(actual)).astype(float)
+
+ ref, out = ref.mean(axis=2), out.mean(axis=2) # convert to grayscale
+ delta = np.abs(out - ref).astype(float) / 255
+ return ImageDifference(delta.mean(), ref, out)
+
+