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Remove now unnecessary fix_gradient_stops function

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Webrender solved the issue with servo/webrender#1189.
This commit is contained in:
Pyfisch 2018-02-11 22:53:51 +01:00
parent 2d74bcfea5
commit 8d061118c4
1 changed files with 3 additions and 48 deletions
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51
components/layout/display_list/background.rs
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@ -322,8 +322,7 @@ fn convert_gradient_stops(gradient_items: &[GradientItem], total_length: Au) ->
}
// Step 3: Evenly space stops without position.
// Note: Remove the + 2 if fix_gradient_stops is changed.
let mut stops = Vec::with_capacity(stop_items.len() + 2);
let mut stops = Vec::with_capacity(stop_items.len());
let mut stop_run = None;
for (i, stop) in stop_items.iter().enumerate() {
let offset = match stop.position {
@ -427,14 +426,7 @@ pub fn convert_linear_gradient(
// This is the length of the gradient line.
let length = Au::from_f32_px((delta.x.to_f32_px() * 2.0).hypot(delta.y.to_f32_px() * 2.0));
let mut stops = convert_gradient_stops(stops, length);
// Only clamped gradients need to be fixed because in repeating gradients
// there is no "first" or "last" stop because they repeat infinitly in
// both directions, so the rendering is always correct.
if !repeating {
fix_gradient_stops(&mut stops);
}
let stops = convert_gradient_stops(stops, length);
let center = Point2D::new(size.width / 2, size.height / 2);
@ -473,12 +465,7 @@ pub fn convert_radial_gradient(
},
};
let mut stops = convert_gradient_stops(stops, radius.width);
// Repeating gradients have no last stops that can be ignored. So
// fixup is not necessary but may actually break the gradient.
if !repeating {
fix_gradient_stops(&mut stops);
}
let stops = convert_gradient_stops(stops, radius.width);
display_list::RadialGradient {
center: center.to_layout(),
@ -488,38 +475,6 @@ pub fn convert_radial_gradient(
}
}
#[inline]
/// Duplicate the first and last stops if necessary.
///
/// Explanation by pyfisch:
/// If the last stop is at the same position as the previous stop the
/// last color is ignored by webrender. This differs from the spec
/// (I think so). The implementations of Chrome and Firefox seem
/// to have the same problem but work fine if the position of the last
/// stop is smaller than 100%. (Otherwise they ignore the last stop.)
///
/// Similarly the first stop is duplicated if it is not placed
/// at the start of the virtual gradient ray.
fn fix_gradient_stops(stops: &mut Vec<GradientStop>) {
if stops.first().unwrap().offset > 0.0 {
let color = stops.first().unwrap().color;
stops.insert(
0,
GradientStop {
offset: 0.0,
color: color,
},
)
}
if stops.last().unwrap().offset < 1.0 {
let color = stops.last().unwrap().color;
stops.push(GradientStop {
offset: 1.0,
color: color,
})
}
}
/// Returns the the distance to the nearest or farthest corner depending on the comperator.
fn get_distance_to_corner<F>(size: &Size2D<Au>, center: &Point2D<Au>, cmp: F) -> Au
where