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Merge pull request #4675 from radarhere/polygon

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Fixed drawing a 1px high polygon
This commit is contained in:
Hugo van Kemenade 2020-06-08 08:57:02 +03:00 committed by GitHub
commit b6d6f77262
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3 changed files with 17 additions and 3 deletions
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Tests/images/imagedraw_polygon_1px_high.png Normal file
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14
Tests/test_imagedraw.py
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@ -531,6 +531,20 @@ def test_polygon_kite():
assert_image_equal(im, Image.open(expected))
def test_polygon_1px_high():
# Test drawing a 1px high polygon
# Arrange
im = Image.new("RGB", (3, 3))
draw = ImageDraw.Draw(im)
expected = "Tests/images/imagedraw_polygon_1px_high.png"
# Act
draw.polygon([(0, 1), (0, 1), (2, 1), (2, 1)], "#f00")
# Assert
assert_image_equal(im, Image.open(expected))
def helper_rectangle(bbox):
# Arrange
im = Image.new("RGB", (W, H))

6
src/libImaging/Draw.c
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@ -489,15 +489,15 @@ polygon_generic(Imaging im, int n, Edge *e, int ink, int eofill,
}
for (i = 0; i < n; i++) {
if (e[i].ymin == e[i].ymax) {
continue;
}
if (ymin > e[i].ymin) {
ymin = e[i].ymin;
}
if (ymax < e[i].ymax) {
ymax = e[i].ymax;
}
if (e[i].ymin == e[i].ymax) {
continue;
}
edge_table[edge_count++] = (e + i);
}
if (ymin < 0) {