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lib/imlib: Fix draw line glitch.
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@ -211,6 +211,7 @@ void imlib_draw_line(image_t *img, int x0, int y0, int x1, int y1, int c, int th
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// steep line
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x1 = (e2 + th / 2) / dy; // start offset
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int err = x1 * dy - th / 2; // shift error value to offset width
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err = IM_MAX(err, 0); // prevent negative error on straight line
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for (x0 -= x1 * sx;; y0 += sy) {
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x1 = x0;
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imlib_set_pixel_aa(img, x1, y0, err, c); // aliasing pre-pixel
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@ -232,6 +233,7 @@ void imlib_draw_line(image_t *img, int x0, int y0, int x1, int y1, int c, int th
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// flat line
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y1 = (e2 + th / 2) / dx; // start offset
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int err = y1 * dx - th / 2; // shift error value to offset width
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err = IM_MAX(err, 0); // prevent negative error on straight line
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for (y0 -= y1 * sy;; x0 += sx) {
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y1 = y0;
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imlib_set_pixel_aa(img, x0, y1, err, c); // aliasing pre-pixel
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