make transpose part of public api

PIL/Image.py

@@ -150,6 +150,7 @@ FLIP_TOP_BOTTOM = 1
 ROTATE_90 = 2
 ROTATE_180 = 3
 ROTATE_270 = 4
+TRANSPOSE = 5
 
 # transforms
 AFFINE = 0
@@ -1921,13 +1922,13 @@ class Image:
 
         :param method: One of :py:attr:`PIL.Image.FLIP_LEFT_RIGHT`,
           :py:attr:`PIL.Image.FLIP_TOP_BOTTOM`, :py:attr:`PIL.Image.ROTATE_90`,
-          :py:attr:`PIL.Image.ROTATE_180`, or :py:attr:`PIL.Image.ROTATE_270`.
+          :py:attr:`PIL.Image.ROTATE_180`, :py:attr:`PIL.Image.ROTATE_270` or
+          :py:attr:`PIL.Image.TRANSPOSE`.
         :returns: Returns a flipped or rotated copy of this image.
         """
 
         self.load()
-        im = self.im.transpose(method)
-        return self._new(im)
+        return self._new(self.im.transpose(method))
 
     def effect_spread(self, distance):
         """

_imaging.c

@@ -1750,6 +1750,7 @@ _transpose(ImagingObject* self, PyObject* args)
         break;
     case 2: /* rotate 90 */
     case 4: /* rotate 270 */
+    case 5: /* transpose */
         imOut = ImagingNew(imIn->mode, imIn->ysize, imIn->xsize);
         break;
     default:
@@ -1774,6 +1775,9 @@ _transpose(ImagingObject* self, PyObject* args)
         case 4:
             (void) ImagingRotate270(imOut, imIn);
             break;
+        case 5:
+            (void) ImagingTranspose(imOut, imIn);
+            break;
         }
 
     return PyImagingNew(imOut);