Added fill decoder

Tests/test_file_fpx.py

@@ -2,7 +2,7 @@ import pytest
 
 from PIL import Image
 
-from .helper import assert_image_equal_tofile
+from .helper import assert_image_equal, assert_image_equal_tofile
 
 FpxImagePlugin = pytest.importorskip(
     "PIL.FpxImagePlugin", reason="olefile not installed"
@@ -18,6 +18,20 @@ def test_sanity():
         assert_image_equal_tofile(im, "Tests/images/input_bw_one_band.png")
 
 
+def test_fill():
+    with Image.open("Tests/images/input_bw_fill.fpx") as im:
+        # The first tile has been hexedited to fill with white
+        compression, (x, y, x1, y1) = im.tile[0][:2]
+        assert compression == "fpx_fill"
+        assert (x, y, x1, y1) == (0, 0, 64, 46)
+
+        with Image.open("Tests/images/input_bw_one_band.png") as im2:
+            for x in range(x1):
+                for y in range(y1):
+                    im2.putpixel((x, y), 255)
+            assert_image_equal(im, im2)
+
+
 def test_invalid_file():
     # Test an invalid OLE file
     invalid_file = "Tests/images/flower.jpg"

src/PIL/FpxImagePlugin.py

@@ -171,10 +171,9 @@ class FpxImageFile(ImageFile.ImageFile):
 
             elif compression == 1:
 
-                # FIXME: the fill decoder is not implemented
                 self.tile.append(
                     (
-                        "fill",
+                        "fpx_fill",
                         (x, y, x1, y1),
                         i32(s, i) + 28,
                         (self.rawmode, s[12:16]),
@@ -236,10 +235,23 @@ class FpxImageFile(ImageFile.ImageFile):
         return ImageFile.ImageFile.load(self)
 
 
+class FpxFillDecoder(ImageFile.PyDecoder):
+    _pulls_fd = True
+
+    def decode(self, buffer):
+        rawmode, color = self.args
+        bands = Image.getmodebands(rawmode)
+        data = color[:bands] * self.state.xsize * self.state.ysize
+        self.set_as_raw(data, rawmode)
+        return -1, 0
+
+
 #
 # --------------------------------------------------------------------
 
 
 Image.register_open(FpxImageFile.format, FpxImageFile, _accept)
 
+Image.register_decoder("fpx_fill", FpxFillDecoder)
+
 Image.register_extension(FpxImageFile.format, ".fpx")