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Fixed drawing translucent 1px high polygons

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This commit is contained in:
Andrew Murray 2022-05-06 22:35:26 +10:00
parent 3fa89f09eb
commit c824ab048f
3 changed files with 16 additions and 2 deletions
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Tests/images/imagedraw_polygon_1px_high_translucent.png Normal file
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14
Tests/test_imagedraw.py
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@ -655,6 +655,20 @@ def test_polygon_1px_high():
assert_image_equal_tofile(im, expected)
def test_polygon_1px_high_translucent():
# Test drawing a translucent 1px high polygon
# Arrange
im = Image.new("RGB", (4, 3))
draw = ImageDraw.Draw(im, "RGBA")
expected = "Tests/images/imagedraw_polygon_1px_high_translucent.png"
# Act
draw.polygon([(1, 1), (1, 1), (3, 1), (3, 1)], (255, 0, 0, 127))
# Assert
assert_image_equal_tofile(im, expected)
def test_polygon_translucent():
# Arrange
im = Image.new("RGB", (W, H))

4
src/libImaging/Draw.c
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@ -419,7 +419,7 @@ draw_horizontal_lines(
if (e[i].ymin == y && e[i].ymin == e[i].ymax) {
int xmax;
int xmin = e[i].xmin;
if (*x_pos < xmin) {
if (*x_pos != -1 && *x_pos < xmin) {
// Line would be after the current position
continue;
}
@ -540,7 +540,7 @@ polygon_generic(Imaging im, int n, Edge *e, int ink, int eofill, hline_handler h
}
qsort(xx, j, sizeof(float), x_cmp);
if (hasAlpha == 1) {
int x_pos = 0;
int x_pos = j == 0 ? -1 : 0;
for (i = 1; i < j; i += 2) {
int x_end = ROUND_DOWN(xx[i]);
if (x_end < x_pos) {