Merge pull request #1881 from uploadcare/fpi-resample

Fixed point integer resample

Tests/test_image_resample.py

@@ -150,5 +150,41 @@ def test_enlarge_lanczos(self):
             self.make_sample(data, (12, 12)))
 
 
+class CoreResampleConsistencyTest(PillowTestCase):
+    def make_case(self, mode, fill):
+        im = Image.new(mode, (512, 9), fill)
+        return (im.resize((9, 512), Image.LANCZOS), im.load()[0, 0])
+
+    def run_case(self, case):
+        channel, color = case
+        px = channel.load()
+        for x in range(channel.size[0]):
+            for y in range(channel.size[1]):
+                if px[x, y] != color:
+                    message = "{} != {} for pixel {}".format(
+                        px[x, y], color, (x, y))
+                    self.assertEqual(px[x, y], color, message)
+
+    def test_8u(self):
+        im, color = self.make_case('RGB', (0, 64, 255))
+        r, g, b = im.split()
+        self.run_case((r, color[0]))
+        self.run_case((g, color[1]))
+        self.run_case((b, color[2]))
+        self.run_case(self.make_case('L', 12))
+
+    def test_32i(self):
+        self.run_case(self.make_case('I', 12))
+        self.run_case(self.make_case('I', 0x7fffffff))
+        self.run_case(self.make_case('I', -12))
+        self.run_case(self.make_case('I', -1 << 31))
+
+    def test_32f(self):
+        self.run_case(self.make_case('F', 1))
+        self.run_case(self.make_case('F', 3.40282306074e+38))
+        self.run_case(self.make_case('F', 1.175494e-38))
+        self.run_case(self.make_case('F', 1.192093e-07))
+
+
 if __name__ == '__main__':
     unittest.main()