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LibGfx: Implement antialiased outline ellipsis
This is a first pass at antialiased outline ellipses, currently this is done by painting two filled AA ellipses, and then subtracting the inner ellipse from the outer. This produces a good result, but unfortunately requires allocating a temporary bitmap in the painter. I did try a simpler method using the existing line painting functions, and drawing the ellipse as many line segments, but that produced very poor results. I think with some work it should be possible to remove the extra allocation, and I've left a big FIXME for this, but I could not get this working well.
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2 changed files with 53 additions and 12 deletions
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@ -28,8 +28,15 @@ public:
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void translate(float dx, float dy) { m_transform.translate(dx, dy); }
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void translate(FloatPoint const& delta) { m_transform.translate(delta); }
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void fill_circle(IntPoint const& center, int radius, Color);
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void fill_ellipse(IntRect const& a_rect, Color);
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void draw_ellipse(IntRect const& a_rect, Color, int thickness);
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enum class BlendMode {
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Normal,
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AlphaSubtract
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};
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void fill_circle(IntPoint const& center, int radius, Color, BlendMode blend_mode = BlendMode::Normal);
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void fill_ellipse(IntRect const& a_rect, Color, BlendMode blend_mode = BlendMode::Normal);
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void fill_rect_with_rounded_corners(IntRect const&, Color, int radius);
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void fill_rect_with_rounded_corners(IntRect const&, Color, int top_left_radius, int top_right_radius, int bottom_right_radius, int bottom_left_radius);
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@ -44,7 +51,8 @@ private:
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return n >= min && n <= max;
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}
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};
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Range draw_ellipse_part(IntPoint a_rect, int radius_a, int radius_b, Color, bool flip_x_and_y, Optional<Range> x_clip);
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Range draw_ellipse_part(IntPoint a_rect, int radius_a, int radius_b, Color, bool flip_x_and_y, Optional<Range> x_clip, BlendMode blend_mode);
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enum class AntiAliasPolicy {
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OnlyEnds,
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