Accept float values for putdata() in Python 3.10

Author: radarhere

Tests/test_image_putdata.py

@@ -47,6 +47,12 @@ def test_pypy_performance():
     im.putdata(list(range(256)) * 256)
 
 
+def test_mode_with_L_with_float():
+    im = Image.new("L", (1, 1), 0)
+    im.putdata([2.0])
+    assert im.getpixel((0, 0)) == 2
+
+
 def test_mode_i():
     src = hopper("L")
     data = list(src.getdata())

src/_imaging.c

@@ -1526,7 +1526,7 @@ _putdata(ImagingObject *self, PyObject *args) {
                 /* Clipped data */
                 for (i = x = y = 0; i < n; i++) {
                     op = PySequence_Fast_GET_ITEM(seq, i);
-                    image->image8[y][x] = (UINT8)CLIP8(PyLong_AsLong(op));
+                    image->image8[y][x] = (UINT8)CLIP8((int)PyFloat_AsDouble(op));
                     if (++x >= (int)image->xsize) {
                         x = 0, y++;
                     }