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LibGfx: Prevent out-of-bounds accumulation in PathRasterizer
Negative accumulation on the right-hand side of the accumulation bitmap would wrap around to the left, causing a negative start for certain lines which resulted in horizontal streaks of lower alpha values. Prevent this by not writing out of bounds :^) Fixes #18394
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@ -102,7 +102,8 @@ void PathRasterizer::draw_line(Gfx::FloatPoint p0, Gfx::FloatPoint p1)
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// If x0 and x1 are within the same pixel, then area to the right is (1 - (mid(x0, x1) - x0_floor)) * dy
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float area = .5f * (x0 + x1) - x0_floor;
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m_data[line_offset + x0_floor_i] += directed_dy * (1.f - area);
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m_data[line_offset + x0_floor_i + 1] += directed_dy * area;
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if (x0_floor_i + 1 < static_cast<u32>(m_size.width()))
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m_data[line_offset + x0_floor_i + 1] += directed_dy * area;
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} else {
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float x0_right = 1.f - (x0 - x0_floor);
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u32 x1_floor_i = floorf(x1);
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