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LibWeb: Calculate to <corner> angles for linear-gradients

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This also renames LinearGradientStyleValue::angle() to
LinearGradientStyleValue::angle_degrees() to make the unit more
obvious.
This commit is contained in:
MacDue 2022-07-17 19:45:38 +01:00 • committed by Linus Groh
parent 9e06fe4b3f
commit 4246d04e5a
3 changed files with 15 additions and 6 deletions
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17
Userland/Libraries/LibWeb/CSS/StyleValue.cpp
View file

@ -1502,9 +1502,11 @@ bool LinearGradientStyleValue::equals(StyleValue const& other_) const
return true;
}
float LinearGradientStyleValue::angle(Gfx::FloatRect const& background_box) const
float LinearGradientStyleValue::angle_degrees(Gfx::FloatRect const& gradient_rect) const
{
(void)background_box;
auto corner_angle_degrees = [&] {
return static_cast<float>(atan2(gradient_rect.height(), gradient_rect.width())) * 180 / AK::Pi<float>;
};
return m_direction.visit(
[&](SideOrCorner side_or_corner) {
switch (side_or_corner) {
@ -1516,9 +1518,16 @@ float LinearGradientStyleValue::angle(Gfx::FloatRect const& background_box) cons
return 270.0f;
case SideOrCorner::Right:
return 90.0f;
case SideOrCorner::TopRight:
return corner_angle_degrees();
case SideOrCorner::BottomLeft:
return corner_angle_degrees() + 180.0f;
case SideOrCorner::TopLeft:
return -corner_angle_degrees();
case SideOrCorner::BottomRight:
return -(corner_angle_degrees() + 180.0f);
default:
// FIXME: Angle gradients towards corners
return 0.0f;
VERIFY_NOT_REACHED();
}
},
[&](Angle const& angle) {

2
Userland/Libraries/LibWeb/CSS/StyleValue.h
View file

@ -936,7 +936,7 @@ public:
return m_color_stop_list;
}
float angle(Gfx::FloatRect const& background_box) const;
float angle_degrees(Gfx::FloatRect const& gradient_rect) const;
private:
LinearGradientStyleValue(GradientDirection direction, Vector<ColorStopListElement> color_stop_list)

2
Userland/Libraries/LibWeb/Painting/BackgroundPainting.cpp
View file

@ -27,7 +27,7 @@ static Optional<GfxGradient> linear_gradient_to_gfx_gradient(CSS::LinearGradient
if (linear_gradient.color_stop_list().size() != 2)
return {};
auto angle = round_to<int>(linear_gradient.angle(background_rect));
auto angle = round_to<int>(linear_gradient.angle_degrees(background_rect));
auto color_a = linear_gradient.color_stop_list()[0].color_stop.color;
auto color_b = linear_gradient.color_stop_list()[1].color_stop.color;
auto orientation = [&]() -> Optional<Gfx::Orientation> {