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LibGfx: Clip outside the corners when painting an AA rounded rectangle

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MacDue 2022-06-11 17:35:29 +01:00 • committed by Linus Groh
parent 5bc5c0f31b
commit 0120c8580f
Notes: sideshowbarker 2024-07-17 11:34:34 +09:00
1 changed files with 31 additions and 5 deletions
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36
Userland/Libraries/LibGfx/AntiAliasingPainter.cpp
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@ -499,13 +499,39 @@ void Gfx::AntiAliasingPainter::fill_rect_with_rounded_corners(IntRect const& a_r
m_underlying_painter.fill_rect(left_rect, color);
m_underlying_painter.fill_rect(inner, color);
// FIXME: Don't draw a whole circle each time
enum class CornerClip {
TopLeft,
BottomLeft,
TopRight,
BottomRight
};
auto fill_corner = [&](auto const& point, int radius, CornerClip clip) {
PainterStateSaver save { m_underlying_painter };
auto corner_clip = IntRect::from_two_points(point, [&] {
switch (clip) {
case CornerClip::TopLeft:
return point.translated(-radius, -radius);
case CornerClip::BottomLeft:
return point.translated(-radius, radius);
case CornerClip::TopRight:
return point.translated(radius, -radius);
case CornerClip::BottomRight:
return point.translated(radius, radius);
default:
VERIFY_NOT_REACHED();
}
}());
m_underlying_painter.add_clip_rect(corner_clip);
fill_circle(point, radius, color);
};
if (top_left_radius)
fill_circle(top_left_corner, top_left_radius, color);
fill_corner(top_left_corner, top_left_radius, CornerClip::TopLeft);
if (top_right_radius)
fill_circle(top_right_corner, top_right_radius, color);
fill_corner(top_right_corner, top_right_radius, CornerClip::TopRight);
if (bottom_left_radius)
fill_circle(bottom_left_corner, bottom_left_radius, color);
fill_corner(bottom_left_corner, bottom_left_radius, CornerClip::BottomLeft);
if (bottom_right_radius)
fill_circle(bottom_right_corner, bottom_right_radius, color);
fill_corner(bottom_right_corner, bottom_right_radius, CornerClip::BottomRight);
}