From 8fff9a24446f4ff47f6d05e4a1ed7500b29985f3 Mon Sep 17 00:00:00 2001
From: Andrew Murray <radarhere@users.noreply.github.com>
Date: Tue, 6 Aug 2019 20:03:38 +1000
Subject: [PATCH] Fixed arc drawing bug for a non-whole number of degrees

---
 .../imagedraw_arc_width_non_whole_angle.png       | Bin 0 -> 439 bytes
 Tests/test_imagedraw.py                           |  12 ++++++++++++
 src/libImaging/Draw.c                             |   2 +-
 3 files changed, 13 insertions(+), 1 deletion(-)
 create mode 100644 Tests/images/imagedraw_arc_width_non_whole_angle.png

diff --git a/Tests/images/imagedraw_arc_width_non_whole_angle.png b/Tests/images/imagedraw_arc_width_non_whole_angle.png
new file mode 100644
index 0000000000000000000000000000000000000000..1fb9a3c8695f96479685664b796f42b488a9852d
GIT binary patch
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diff --git a/Tests/test_imagedraw.py b/Tests/test_imagedraw.py
index ffe35a4fa..d53a74168 100644
--- a/Tests/test_imagedraw.py
+++ b/Tests/test_imagedraw.py
@@ -140,6 +140,18 @@ class TestImageDraw(PillowTestCase):
         # Assert
         self.assert_image_similar(im, Image.open(expected), 1)
 
+    def test_arc_width_non_whole_angle(self):
+        # Arrange
+        im = Image.new("RGB", (W, H))
+        draw = ImageDraw.Draw(im)
+        expected = "Tests/images/imagedraw_arc_width_non_whole_angle.png"
+
+        # Act
+        draw.arc(BBOX1, 10, 259.5, width=5)
+
+        # Assert
+        self.assert_image_similar(im, Image.open(expected), 1)
+
     def test_bitmap(self):
         # Arrange
         small = Image.open("Tests/images/pil123rgba.png").resize((50, 50))
diff --git a/src/libImaging/Draw.c b/src/libImaging/Draw.c
index 559be1b00..dee7c524d 100644
--- a/src/libImaging/Draw.c
+++ b/src/libImaging/Draw.c
@@ -834,7 +834,7 @@ ellipse(Imaging im, int x0, int y0, int x1, int y1,
 
         // Build edge list
         // malloc check UNDONE, FLOAT?
-        maxEdgeCount = end - start;
+        maxEdgeCount = ceil(end - start);
         if (inner) {
             maxEdgeCount *= 2;
         }