Added more tests

Tests/test_imagechops.py

@@ -311,8 +311,8 @@ def test_subtract():
 
     # Assert
     assert new.getbbox() == (25, 50, 76, 76)
-    assert new.getpixel((50, 50)) == GREEN
-    assert new.getpixel((50, 51)) == BLACK
+    assert new.getpixel((50, 51)) == GREEN
+    assert new.getpixel((50, 52)) == BLACK
 
 
 def test_subtract_scale_offset():
@@ -350,8 +350,8 @@ def test_subtract_modulo():
 
     # Assert
     assert new.getbbox() == (25, 50, 76, 76)
-    assert new.getpixel((50, 50)) == GREEN
-    assert new.getpixel((50, 51)) == BLACK
+    assert new.getpixel((50, 51)) == GREEN
+    assert new.getpixel((50, 52)) == BLACK
 
 
 def test_subtract_modulo_no_clip():

Tests/test_imagedraw.py

@@ -166,6 +166,19 @@ def test_arc_width_non_whole_angle():
     assert_image_similar(im, Image.open(expected), 1)
 
 
+def test_arc_high():
+    # Arrange
+    im = Image.new("RGB", (200, 200));
+    draw = ImageDraw.Draw(im)
+
+    # Act
+    draw.arc([10, 10, 89, 189], 20, 330, width=20, fill="white")
+    draw.arc([110, 10, 189, 189], 20, 150, width=20, fill="white")
+
+    # Assert
+    assert_image_equal(im, Image.open("Tests/images/imagedraw_arc_high.png"))
+
+
 def test_bitmap():
     # Arrange
     im = Image.new("RGB", (W, H))
@@ -242,6 +255,18 @@ def test_chord_zero_width():
         assert_image_equal(im, expected)
 
 
+def test_chord_too_fat():
+    # Arrange
+    im = Image.new("RGB", (100, 100));
+    draw = ImageDraw.Draw(im)
+
+    # Act
+    draw.chord([-150, -150, 99, 99], 15, 60, width=10, fill="white", outline="red")
+
+    # Assert
+    assert_image_equal(im, Image.open("Tests/images/imagedraw_chord_too_fat.png"))
+
+
 def helper_ellipse(mode, bbox):
     # Arrange
     im = Image.new(mode, (W, H))
@@ -511,6 +536,18 @@ def test_pieslice_zero_width():
         assert_image_equal(im, expected)
 
 
+def test_pieslice_wide():
+    # Arrange
+    im = Image.new("RGB", (200, 100));
+    draw = ImageDraw.Draw(im)
+
+    # Act
+    draw.pieslice([0, 0, 199, 99], 190, 170, width=10, fill="white", outline="red")
+
+    # Assert
+    assert_image_equal(im, Image.open("Tests/images/imagedraw_pieslice_wide.png"))
+
+
 def helper_point(points):
     # Arrange
     im = Image.new("RGB", (W, H))

src/libImaging/Draw.c

@@ -1198,6 +1198,7 @@ void arc_init(clip_ellipse_state* s, int32_t a, int32_t b, int32_t w, float al,
 
     s->head = NULL;
     s->node_count = 0;
+    normalize_angles(&al, &ar);
 
     // building clipping tree, a lot of different cases
     if (ar == al + 360) {
@@ -1494,7 +1495,6 @@ int
 ImagingDrawEllipse(Imaging im, int x0, int y0, int x1, int y1,
                    const void* ink, int fill, int width, int op)
 {
-    //fprintf(stderr, "E (%d %d) (%d %d) --- %08X f%d w%d o%d\n", x0, y0, x1, y1, *(int*)ink, fill, width, op);
     return ellipseNew(im, x0, y0, x1, y1, ink, fill, width, op);
 }
 
@@ -1502,7 +1502,6 @@ int
 ImagingDrawArc(Imaging im, int x0, int y0, int x1, int y1,
                float start, float end, const void* ink, int width, int op)
 {
-    //fprintf(stderr, "A (%d %d) (%d %d) %f-%f %08X f- w%d o%d\n", x0, y0, x1, y1, start, end, *(int*)ink, width, op);
     normalize_angles(&start, &end);
     if (start + 360 == end) {
       return ImagingDrawEllipse(im, x0, y0, x1, y1, ink, 0, width, op);
@@ -1519,7 +1518,6 @@ ImagingDrawChord(Imaging im, int x0, int y0, int x1, int y1,
                  float start, float end, const void* ink, int fill,
                  int width, int op)
 {
-    //fprintf(stderr, "C (%d %d) (%d %d) %f-%f %08X f%d w%d o%d\n", x0, y0, x1, y1, start, end, *(int*)ink, fill, width, op);
     normalize_angles(&start, &end);
     if (start + 360 == end) {
       return ImagingDrawEllipse(im, x0, y0, x1, y1, ink, fill, width, op);
@@ -1543,7 +1541,6 @@ ImagingDrawPieslice(Imaging im, int x0, int y0, int x1, int y1,
                     float start, float end, const void* ink, int fill,
                     int width, int op)
 {
-    // fprintf(stderr, "P (%d %d) (%d %d) %f-%f %08X f%d w%d o%d\n", x0, y0, x1, y1, start, end, *(int*)ink, fill, width, op);
     normalize_angles(&start, &end);
     if (start + 360 == end) {
       return ellipseNew(im, x0, y0, x1, y1, ink, fill, width, op);