Merge pull request #437 from wiredfool/2gigapix-image

2gigapix image fixes

Tests/large_memory_test.py

@@ -0,0 +1,27 @@
+from tester import *
+
+# This test is not run automatically.
+#
+# It requires > 2gb memory for the >2 gigapixel image generated in the
+# second test.  Running this automatically would amount to a denial of
+# service on our testing infrastructure.  I expect this test to fail
+# on any 32 bit machine, as well as any smallish things (like
+# raspberrypis). It does succeed on a 3gb Ubuntu 12.04x64 VM on python
+# 2.7 an 3.2
+
+from PIL import Image
+ydim = 32769
+xdim = 48000
+f = tempfile('temp.png')
+
+def _write_png(xdim,ydim):
+    im = Image.new('L',(xdim,ydim),(0))
+    im.save(f)
+    success()
+
+def test_large():
+    """ succeeded prepatch"""
+    _write_png(xdim,ydim)
+def test_2gpx():
+    """failed prepatch"""
+    _write_png(xdim,xdim)

_imaging.c

@@ -1234,7 +1234,8 @@ static PyObject*
 _putdata(ImagingObject* self, PyObject* args)
 {
     Imaging image;
-    int n, i, x, y;
+    // i & n are # pixels, require py_ssize_t. x can be as large as n. y, just because.
+    Py_ssize_t n, i, x, y;
 
     PyObject* data;
     double scale = 1.0;
@@ -1244,16 +1245,16 @@ _putdata(ImagingObject* self, PyObject* args)
         return NULL;
 
     if (!PySequence_Check(data)) {
-    PyErr_SetString(PyExc_TypeError, must_be_sequence);
-    return NULL;
+        PyErr_SetString(PyExc_TypeError, must_be_sequence);
+        return NULL;
     }
 
     image = self->image;
 
     n = PyObject_Length(data);
-    if (n > (int) (image->xsize * image->ysize)) {
-    PyErr_SetString(PyExc_TypeError, "too many data entries");
-    return NULL;
+    if (n > (Py_ssize_t) (image->xsize * image->ysize)) {
+        PyErr_SetString(PyExc_TypeError, "too many data entries");
+        return NULL;
     }
 
     if (image->image8) {
@@ -1648,7 +1649,7 @@ _stretch(ImagingObject* self, PyObject* args)
     imIn = self->image;
 
     /* two-pass resize: minimize size of intermediate image */
-    if (imIn->xsize * ysize < xsize * imIn->ysize)
+    if ((Py_ssize_t) imIn->xsize * ysize < (Py_ssize_t) xsize * imIn->ysize)
         imTemp = ImagingNew(imIn->mode, imIn->xsize, ysize);
     else
         imTemp = ImagingNew(imIn->mode, xsize, imIn->ysize);
@@ -3073,7 +3074,7 @@ image_length(ImagingObject *self)
 {
     Imaging im = self->image;
 
-    return im->xsize * im->ysize;
+    return (Py_ssize_t) im->xsize * im->ysize;
 }
 
 static PyObject *