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layout: Correctly calculate the angle for gradients with corners
The previous code assumed that the diagonals of the elements were perpendicular, which only happens with squares. tests: layout: Test linear gradient corners
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4 changed files with 114 additions and 26 deletions
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@ -592,36 +592,42 @@ impl FragmentDisplayListBuilding for Fragment {
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let mut clip = clip.clone();
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clip.intersect_rect(absolute_bounds);
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// This is the distance between the center and the ending point; i.e. half of the distance
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// between the starting point and the ending point.
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let delta = match gradient.angle_or_corner {
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AngleOrCorner::Angle(angle) => {
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// Get correct gradient line length, based on:
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// https://drafts.csswg.org/css-images-3/#linear-gradients
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let dir = Point2D::new(angle.radians().sin(), -angle.radians().cos());
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let line_length = (dir.x * absolute_bounds.size.width.to_f32_px()).abs() +
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(dir.y * absolute_bounds.size.height.to_f32_px()).abs();
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let inv_dir_length = 1.0 / (dir.x * dir.x + dir.y * dir.y).sqrt();
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Point2D::new(Au::from_f32_px(dir.x * inv_dir_length * line_length / 2.0),
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Au::from_f32_px(dir.y * inv_dir_length * line_length / 2.0))
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}
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let angle = match gradient.angle_or_corner {
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AngleOrCorner::Angle(angle) => angle.radians(),
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AngleOrCorner::Corner(horizontal, vertical) => {
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let x_factor = match horizontal {
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HorizontalDirection::Left => -1,
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HorizontalDirection::Right => 1,
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};
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let y_factor = match vertical {
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VerticalDirection::Top => -1,
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VerticalDirection::Bottom => 1,
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};
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Point2D::new(absolute_bounds.size.width * x_factor / 2,
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absolute_bounds.size.height * y_factor / 2)
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// This the angle for one of the diagonals of the box. Our angle
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// will either be this one, this one + PI, or one of the other
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// two perpendicular angles.
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let atan = (absolute_bounds.size.height.to_f32_px() /
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absolute_bounds.size.width.to_f32_px()).atan();
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match (horizontal, vertical) {
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(HorizontalDirection::Right, VerticalDirection::Bottom)
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=> f32::consts::PI - atan,
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(HorizontalDirection::Left, VerticalDirection::Bottom)
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=> f32::consts::PI + atan,
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(HorizontalDirection::Right, VerticalDirection::Top)
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=> atan,
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(HorizontalDirection::Left, VerticalDirection::Top)
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=> -atan,
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}
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}
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};
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// Get correct gradient line length, based on:
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// https://drafts.csswg.org/css-images-3/#linear-gradients
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let dir = Point2D::new(angle.sin(), -angle.cos());
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let line_length = (dir.x * absolute_bounds.size.width.to_f32_px()).abs() +
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(dir.y * absolute_bounds.size.height.to_f32_px()).abs();
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let inv_dir_length = 1.0 / (dir.x * dir.x + dir.y * dir.y).sqrt();
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// This is the vector between the center and the ending point; i.e. half
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// of the distance between the starting point and the ending point.
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let delta = Point2D::new(Au::from_f32_px(dir.x * inv_dir_length * line_length / 2.0),
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Au::from_f32_px(dir.y * inv_dir_length * line_length / 2.0));
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// This is the length of the gradient line.
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let length = Au::from_f32_px(
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(delta.x.to_f32_px() * 2.0).hypot(delta.y.to_f32_px() * 2.0));
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@ -629,7 +635,8 @@ impl FragmentDisplayListBuilding for Fragment {
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// Determine the position of each stop per CSS-IMAGES § 3.4.
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//
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// FIXME(#3908, pcwalton): Make sure later stops can't be behind earlier stops.
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let (mut stops, mut stop_run) = (Vec::new(), None);
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let mut stops = Vec::with_capacity(gradient.stops.len());
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let mut stop_run = None;
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for (i, stop) in gradient.stops.iter().enumerate() {
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let offset = match stop.position {
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None => {
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