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Consider I;16 pixel size when using a 1 mode mask #8112

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Jun 25, 2024
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Consider I;16 pixel size when using a 1 mode mask #8112

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Binary file added Tests/images/imagedraw_polygon_width_I.tiff
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13 changes: 13 additions & 0 deletions Tests/test_imagedraw.py
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Original file line number Diff line number Diff line change
Expand Up @@ -631,6 +631,19 @@ def test_polygon(points: Coords) -> None:
assert_image_equal_tofile(im, "Tests/images/imagedraw_polygon.png")


@pytest.mark.parametrize("points", POINTS)
def test_polygon_width_I16(points: Coords) -> None:
# Arrange
im = Image.new("I;16", (W, H))
draw = ImageDraw.Draw(im)

# Act
draw.polygon(points, outline=0xFFFF, width=2)

# Assert
assert_image_equal_tofile(im, "Tests/images/imagedraw_polygon_width_I.tiff")


@pytest.mark.parametrize("mode", ("RGB", "L"))
@pytest.mark.parametrize("kite_points", KITE_POINTS)
def test_polygon_kite(
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26 changes: 22 additions & 4 deletions src/libImaging/Paste.c
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Original file line number Diff line number Diff line change
Expand Up @@ -65,15 +65,32 @@ paste_mask_1(
int x, y;

if (imOut->image8) {
int in_i16 = strncmp(imIn->mode, "I;16", 4) == 0;
int out_i16 = strncmp(imOut->mode, "I;16", 4) == 0;
for (y = 0; y < ysize; y++) {
UINT8 *out = imOut->image8[y + dy] + dx;
if (out_i16) {
out += dx;
}
UINT8 *in = imIn->image8[y + sy] + sx;
if (in_i16) {
in += sx;
}
UINT8 *mask = imMask->image8[y + sy] + sx;
for (x = 0; x < xsize; x++) {
if (*mask++) {
if (*mask) {
*out = *in;
}
out++, in++;
if (in_i16) {
in++;
}
if (out_i16) {
out++;
if (*mask) {
*out = *in;
}
}
out++, in++, mask++;
}
}

Expand Down Expand Up @@ -415,15 +432,16 @@ fill_mask_L(
unsigned int tmp1;

if (imOut->image8) {
int i16 = strncmp(imOut->mode, "I;16", 4) == 0;
for (y = 0; y < ysize; y++) {
UINT8 *out = imOut->image8[y + dy] + dx;
if (strncmp(imOut->mode, "I;16", 4) == 0) {
if (i16) {
out += dx;
}
UINT8 *mask = imMask->image8[y + sy] + sx;
for (x = 0; x < xsize; x++) {
*out = BLEND(*mask, *out, ink[0], tmp1);
if (strncmp(imOut->mode, "I;16", 4) == 0) {
if (i16) {
out++;
*out = BLEND(*mask, *out, ink[1], tmp1);
}
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