Function (w/ tests) for checking that resolution specification is valid

stimuli/utils/sizes.py

@@ -5,6 +5,20 @@
 Ppd = namedtuple("Ppd", "vertical horizontal")
 
 
+class ResolutionError(ValueError):
+    pass
+
+
+def valid_resolution(shape, visual_size, ppd):
+    shape = validate_shape(shape)
+    ppd = validate_ppd(ppd)
+    visual_size = validate_visual_size(visual_size)
+
+    calculated = shape_from_visual_size_ppd(visual_size=visual_size, ppd=ppd)
+    if calculated != shape:
+        raise ResolutionError(f"Invalid resolution; {visual_size},{shape},{ppd}")
+
+
 def visual_size_from_shape_ppd(shape, ppd):
     shape = validate_shape(shape)
     ppd = validate_ppd(ppd)

tests/test_resolve.py

@@ -0,0 +1,39 @@
+import pytest
+from stimuli.utils import sizes
+
+
+@pytest.mark.parametrize(
+    "shape, visual_size, ppd",
+    (
+        ((1024, 1024), (32, 32), (32, 32)),
+        ((1024, 1024), (32, 16), (32, 64)),
+        ((512, 1024), (16, 64), (32, 16)),
+        ((500, 400), (20, 40), (25, 10)),
+        (1024, (32, 32), (32, 32)),
+        ((1024, 1024), 32, (32, 32)),
+        ((1024, 1024), (32, 32), 32),
+    ),
+)
+def test_pass_valid_resolution(shape, visual_size, ppd):
+    sizes.valid_resolution(shape=shape, visual_size=visual_size, ppd=ppd)
+
+
+@pytest.mark.parametrize(
+    "shape, visual_size, ppd",
+    (
+        ((1024, 1024), (32, 32), (16, 16)),
+        ((1024, 1024), (32, 16), (32, 32)),
+        ((512, 1024), (32, 32), (32, 32)),
+        ((500, 400), (20, 20), (25, 10)),
+        (1024, (32, 16), (32, 32)),
+        ((1024, 512), 32, (32, 30)),
+        ((1024, 512), (32, 32), 32),
+    ),
+)
+def test_raises_valid_resolution(shape, visual_size, ppd):
+    with pytest.raises(ValueError) as e_info:
+        sizes.valid_resolution(shape=shape, visual_size=visual_size, ppd=ppd)
+
+
+def test_resolve():
+    pass