From 2657c0dec0ffb8fad660949be4714572211c4148 Mon Sep 17 00:00:00 2001
From: Eric Soroos <eric-github@soroos.net>
Date: Fri, 7 Nov 2014 14:47:23 -0800
Subject: [PATCH] Test for endianness issues in stretch

---
 Tests/test_imaging_stretch.py | 67 +++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)

diff --git a/Tests/test_imaging_stretch.py b/Tests/test_imaging_stretch.py
index a9858eff5..52548e3dc 100644
--- a/Tests/test_imaging_stretch.py
+++ b/Tests/test_imaging_stretch.py
@@ -39,6 +39,73 @@ class TestImagingStretch(PillowTestCase):
             self.assertEqual(r.mode, "RGB")
             self.assertEqual(r.size, (764, 414))
 
+    def test_endianess(self):
+        # Make an image with one colored pixel, in one channel.
+        # When stretched, that channel should be the same as a GS image.
+        # Other channels should be unaffected.
+        # The R and A channels should not swap, which is indicitive of
+        # an endianess issues
+
+        im = Image.new('L', (2,2), 0)
+        im.putpixel((1,1),128)
+
+        blank = Image.new('L', (4,4), 0)
+        alpha = Image.new('L', (4,4), 255)
+
+        for f in [Image.BILINEAR, Image.BICUBIC, Image.ANTIALIAS]:
+
+            im_r = Image.new('RGBA', (2,2), (0,0,0,255))
+            im_r.putpixel((1,1),(128,0,0,255))
+
+            target = im._new(im.im.stretch((4,4), f))
+            stretched = im_r._new(im_r.im.stretch((4,4),f))
+
+            self.assert_image_equal(stretched.split()[0],target)
+            self.assert_image_equal(stretched.split()[1],blank)
+            self.assert_image_equal(stretched.split()[2],blank)
+            self.assert_image_equal(stretched.split()[3],alpha)
+
+
+            im_r = Image.new('RGB', (2,2), (0,0,0))
+            im_r.putpixel((1,1),(128,0,0))
+
+            target = im._new(im.im.stretch((4,4), f))
+            stretched = im_r._new(im_r.im.stretch((4,4),f))
+
+            #print " ".join(hex(ord(s)) for s in stretched.split()[0].tobytes())
+            #print " ".join(hex(ord(s)) for s in stretched.split()[1].tobytes())
+            #print " ".join(hex(ord(s)) for s in stretched.split()[2].tobytes())
+
+            #print " ".join(hex(ord(s)) for s in target.tobytes())
+
+            #print
+
+            self.assert_image_equal(stretched.split()[0],target, 'rxRGB R channel fail')
+            self.assert_image_equal(stretched.split()[1],blank, 'rxRGB G channel fail')
+            self.assert_image_equal(stretched.split()[2],blank, 'rxRGB B channel fail')
+
+
+            im_g = Image.new('RGBA', (2,2), (0,0,0,255))
+            im_g.putpixel((1,1),(0,128,0,255))
+
+            stretched = im_g._new(im_g.im.stretch((4,4),f))
+
+            self.assert_image_equal(stretched.split()[0],blank)
+            self.assert_image_equal(stretched.split()[1],target)
+            self.assert_image_equal(stretched.split()[2],blank)
+            self.assert_image_equal(stretched.split()[3],alpha)
+
+
+            im_g = Image.new('RGB', (2,2), (0,0,0))
+            im_g.putpixel((1,1),(0,128,0))
+
+            target = im._new(im.im.stretch((4,4), f))
+            stretched = im_g._new(im_g.im.stretch((4,4),f))
+
+            self.assert_image_equal(stretched.split()[0],blank, 'gxRGB R channel fail')
+            self.assert_image_equal(stretched.split()[1],target, 'gxRGB G channel fail')
+            self.assert_image_equal(stretched.split()[2],blank, 'gxRGB B channel fail')
+
 
 if __name__ == '__main__':
     unittest.main()