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Fix gradient math and positioning. Formatting.

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Start adding repeating gradients.
This commit is contained in:
Pyfisch 2017-04-17 10:50:14 +02:00
parent 6768614fdd
commit 803bc0395c
3 changed files with 175 additions and 179 deletions
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7
components/gfx/display_list/mod.rs
View file

@ -890,6 +890,9 @@ pub struct Gradient {
/// A list of color stops.
pub stops: Vec<GradientStop>,
/// True if gradient repeats infinitly.
pub repeating: bool,
}
#[derive(Clone, Deserialize, HeapSizeOf, Serialize)]
@ -912,6 +915,9 @@ pub struct RadialGradient {
/// A list of color stops.
pub stops: Vec<GradientStop>,
/// True if gradient repeats infinitly.
pub repeating: bool,
}
#[derive(Clone, Deserialize, HeapSizeOf, Serialize)]
@ -923,7 +929,6 @@ pub struct RadialGradientDisplayItem {
pub gradient: RadialGradient,
}
/// A normal border, supporting CSS border styles.
#[derive(Clone, HeapSizeOf, Deserialize, Serialize)]
pub struct NormalBorder {

262
components/layout/display_list_builder.rs
View file

@ -59,7 +59,7 @@ use style::properties::style_structs;
use style::servo::restyle_damage::REPAINT;
use style::values::{Either, RGBA, computed};
use style::values::computed::{AngleOrCorner, Gradient, GradientKind, LengthOrPercentage, LengthOrPercentageOrAuto};
use style::values::computed::{LengthOrKeyword, LengthOrPercentageOrKeyword, NumberOrPercentage};
use style::values::computed::{LengthOrKeyword, LengthOrPercentageOrKeyword, NumberOrPercentage, Position};
use style::values::computed::image::{ColorStop, EndingShape, SizeKeyword};
use style::values::specified::{HorizontalDirection, VerticalDirection};
use style_traits::CSSPixel;
@ -386,16 +386,22 @@ pub trait FragmentDisplayListBuilding {
image_url: &ServoUrl,
background_index: usize);
fn convert_gradient(&self,
absolute_bounds: &Rect<Au>,
gradient: &Gradient,
fn convert_linear_gradient(&self,
bounds: &Rect<Au>,
stops: &[ColorStop],
angle_or_corner: &AngleOrCorner,
repeating: bool,
style: &ServoComputedValues)
-> Option<display_list::Gradient>;
-> display_list::Gradient;
fn convert_radial_gradient(&self,
gradient: &Gradient,
bounds: &Rect<Au>,
stops: &[ColorStop],
shape: &EndingShape,
center: &Position,
repeating: bool,
style: &ServoComputedValues)
-> Option<display_list::RadialGradient>;
-> display_list::RadialGradient;
/// Adds the display items necessary to paint the background linear gradient of this fragment
/// to the appropriate section of the display list.
@ -667,78 +673,66 @@ fn convert_gradient_stops(gradient_stops: &[ColorStop],
/// 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 F: Fn(f32, f32) -> f32 {
let top_left = center.x.to_f32_px().hypot(center.y.to_f32_px());
let top_right = (size.width.to_f32_px() - center.x.to_f32_px()).hypot(center.y.to_f32_px());
let bottom_right = (size.width.to_f32_px() - center.x.to_f32_px())
.hypot(size.height.to_f32_px() - center.y.to_f32_px());
let bottom_left = center.x.to_f32_px().hypot(size.height.to_f32_px() - center.y.to_f32_px());
Au::from_f32_px(cmp(cmp(top_left, top_right), cmp(bottom_right, bottom_left)))
where F: Fn(Au, Au) -> Au
{
let dist = get_distance_to_sides(size, center, cmp);
Au::from_f32_px(dist.width.to_f32_px().hypot(dist.height.to_f32_px()))
}
/// Returns the distance to the nearest or farthest sides depending on the comparator.
///
/// The first return value is horizontal distance the second vertical distance.
fn get_distance_to_sides<F>(size: &Size2D<Au>, center: &Point2D<Au>, cmp: F) -> (Au, Au)
where F: Fn(Au, Au) -> Au {
fn get_distance_to_sides<F>(size: &Size2D<Au>, center: &Point2D<Au>, cmp: F) -> Size2D<Au>
where F: Fn(Au, Au) -> Au
{
let top_side = center.y;
let right_side = size.width - center.x;
let bottom_side = size.height - center.y;
let left_side = center.x;
(cmp(left_side, right_side), cmp(top_side, bottom_side))
Size2D::new(cmp(left_side, right_side), cmp(top_side, bottom_side))
}
/// Returns the radius for an ellipse with the same ratio as if it was matched to the sides.
fn get_scaled_radius<F>(radius: Au, size: &Size2D<Au>, center: &Point2D<Au>, cmp: F) -> Size2D<Au>
where F: Fn(Au, Au) -> Au {
let (horizontal, vertical) = get_distance_to_sides(size, center, cmp);
let factor = horizontal.to_f32_px() / vertical.to_f32_px();
Size2D::new(radius.scale_by(factor), radius.scale_by(factor.recip()))
fn get_ellipse_radius<F>(size: &Size2D<Au>, center: &Point2D<Au>, cmp: F) -> Size2D<Au>
where F: Fn(Au, Au) -> Au
{
let dist = get_distance_to_sides(size, center, cmp);
Size2D::new(dist.width.scale_by(::std::f32::consts::FRAC_1_SQRT_2 * 2.0),
dist.height.scale_by(::std::f32::consts::FRAC_1_SQRT_2 * 2.0))
}
/// Determines the radius of a radial gradient if it was not explicitly provided.
///
/// Determines the radius of a circle if it was not explictly provided.
/// https://drafts.csswg.org/css-images-3/#typedef-size
fn convert_size_keyword(keyword: SizeKeyword,
circle: bool,
fn convert_circle_size_keyword(keyword: SizeKeyword,
size: &Size2D<Au>,
center: &Point2D<Au>) -> Size2D<Au> {
use style::values::computed::image::SizeKeyword::*;
let radius = match keyword {
ClosestSide => {
let dist = get_distance_to_sides(size, center, ::std::cmp::min);
::std::cmp::min(dist.width, dist.height)
}
FarthestSide => {
let dist = get_distance_to_sides(size, center, ::std::cmp::max);
::std::cmp::max(dist.width, dist.height)
}
ClosestCorner => get_distance_to_corner(size, center, ::std::cmp::min),
FarthestCorner => get_distance_to_corner(size, center, ::std::cmp::max),
};
Size2D::new(radius, radius)
}
/// Determines the radius of an ellipse if it was not explictly provided.
/// https://drafts.csswg.org/css-images-3/#typedef-size
fn convert_ellipse_size_keyword(keyword: SizeKeyword,
size: &Size2D<Au>,
center: &Point2D<Au>) -> Size2D<Au> {
use style::values::computed::image::SizeKeyword::*;
match keyword {
ClosestSide => {
let (horizontal, vertical) = get_distance_to_sides(size, center, ::std::cmp::min);
if circle {
let radius = ::std::cmp::min(vertical, horizontal);
Size2D::new(radius, radius)
} else {
Size2D::new(horizontal, vertical)
}
},
FarthestSide => {
let (horizontal, vertical) = get_distance_to_sides(size, center, ::std::cmp::max);
if circle {
let radius = ::std::cmp::max(vertical, horizontal);
Size2D::new(radius, radius)
} else {
Size2D::new(horizontal, vertical)
}
},
ClosestCorner => {
let radius = get_distance_to_corner(size, center, f32::min);
if circle {
Size2D::new(radius, radius)
} else {
get_scaled_radius(radius, size, center, ::std::cmp::min)
}
}
FarthestCorner => {
let radius = get_distance_to_corner(size, center, f32::max);
if circle {
Size2D::new(radius, radius)
} else {
get_scaled_radius(radius, size, center, ::std::cmp::max)
}
}
ClosestSide => get_distance_to_sides(size, center, ::std::cmp::min),
FarthestSide => get_distance_to_sides(size, center, ::std::cmp::max),
ClosestCorner => get_ellipse_radius(size, center, ::std::cmp::min),
FarthestCorner => get_ellipse_radius(size, center, ::std::cmp::max),
}
}
@ -1044,23 +1038,21 @@ impl FragmentDisplayListBuilding for Fragment {
}
}
fn convert_gradient(&self,
absolute_bounds: &Rect<Au>,
gradient: &Gradient,
style: &ServoComputedValues) -> Option<display_list::Gradient> {
// FIXME: Repeating gradients aren't implemented yet.
if gradient.repeating {
return None;
}
let angle = if let GradientKind::Linear(angle_or_corner) = gradient.gradient_kind {
match angle_or_corner {
fn convert_linear_gradient(&self,
bounds: &Rect<Au>,
stops: &[ColorStop],
angle_or_corner: &AngleOrCorner,
repeating: bool,
style: &ServoComputedValues)
-> display_list::Gradient {
let angle = match *angle_or_corner {
AngleOrCorner::Angle(angle) => angle.radians(),
AngleOrCorner::Corner(horizontal, vertical) => {
// This the angle for one of the diagonals of the box. Our angle
// will either be this one, this one + PI, or one of the other
// two perpendicular angles.
let atan = (absolute_bounds.size.height.to_f32_px() /
absolute_bounds.size.width.to_f32_px()).atan();
let atan = (bounds.size.height.to_f32_px() /
bounds.size.width.to_f32_px()).atan();
match (horizontal, vertical) {
(HorizontalDirection::Right, VerticalDirection::Bottom)
=> f32::consts::PI - atan,
@ -1072,17 +1064,14 @@ impl FragmentDisplayListBuilding for Fragment {
=> -atan,
}
}
}
} else {
return None;
};
// Get correct gradient line length, based on:
// https://drafts.csswg.org/css-images-3/#linear-gradients
let dir = Point2D::new(angle.sin(), -angle.cos());
let line_length = (dir.x * absolute_bounds.size.width.to_f32_px()).abs() +
(dir.y * absolute_bounds.size.height.to_f32_px()).abs();
let line_length = (dir.x * bounds.size.width.to_f32_px()).abs() +
(dir.y * bounds.size.height.to_f32_px()).abs();
let inv_dir_length = 1.0 / (dir.x * dir.x + dir.y * dir.y).sqrt();
@ -1095,58 +1084,47 @@ impl FragmentDisplayListBuilding for Fragment {
let length = Au::from_f32_px(
(delta.x.to_f32_px() * 2.0).hypot(delta.y.to_f32_px() * 2.0));
let stops = convert_gradient_stops(&gradient.stops[..],
length,
style);
let stops = convert_gradient_stops(stops, length, style);
let center = Point2D::new(absolute_bounds.size.width / 2,
absolute_bounds.size.height / 2);
let center = Point2D::new(bounds.size.width / 2, bounds.size.height / 2);
Some(display_list::Gradient {
display_list::Gradient {
start_point: center - delta,
end_point: center + delta,
stops: stops,
})
repeating: repeating,
}
}
fn convert_radial_gradient(&self,
gradient: &Gradient,
style: &ServoComputedValues) -> Option<display_list::RadialGradient> {
// FIXME: Repeating gradients aren't implemented yet.
if gradient.repeating {
return None;
}
// FIXME(pcwalton, #2795): Get the real container size.
let container_size = Size2D::zero();
let content_box = self.content_box().to_physical(style.writing_mode, container_size);
let origin = content_box.origin;
let size = content_box.size;
if let GradientKind::Radial(ref shape, ref center) = gradient.gradient_kind {
let center = Point2D::new(specified(center.horizontal, size.width),
specified(center.vertical, size.height));
bounds: &Rect<Au>,
stops: &[ColorStop],
shape: &EndingShape,
center: &Position,
repeating: bool,
style: &ServoComputedValues)
-> display_list::RadialGradient {
let center = Point2D::new(specified(center.horizontal, bounds.size.width),
specified(center.vertical, bounds.size.height));
let radius = match *shape {
EndingShape::Circle(LengthOrKeyword::Length(length))
=> Size2D::new(length, length),
EndingShape::Circle(LengthOrKeyword::Keyword(word))
=> convert_size_keyword(word, true, &size, &center),
=> convert_circle_size_keyword(word, &bounds.size, &center),
EndingShape::Ellipse(LengthOrPercentageOrKeyword::LengthOrPercentage(horizontal,
vertical))
=> Size2D::new(specified(horizontal, size.width),
specified(vertical, size.height)),
=> Size2D::new(specified(horizontal, bounds.size.width),
specified(vertical, bounds.size.height)),
EndingShape::Ellipse(LengthOrPercentageOrKeyword::Keyword(word))
=> convert_size_keyword(word, false, &size, &center),
=> convert_ellipse_size_keyword(word, &bounds.size, &center),
};
let length = Au::from_f32_px(radius.width.to_f32_px().hypot(radius.height.to_f32_px()));
let stops = convert_gradient_stops(&gradient.stops[..],
length,
style);
Some(display_list::RadialGradient {
center: origin + center,
let stops = convert_gradient_stops(stops, length, style);
display_list::RadialGradient {
center: center,
radius: radius,
stops: stops,
})
} else {
None
repeating: repeating,
}
}
@ -1160,33 +1138,45 @@ impl FragmentDisplayListBuilding for Fragment {
let mut clip = clip.clone();
clip.intersect_rect(absolute_bounds);
if let Some(x) = self.convert_gradient(absolute_bounds, gradient, style) {
let base = state.create_base_display_item(absolute_bounds,
let border = style.logical_border_width().to_physical(style.writing_mode);
let mut bounds = *absolute_bounds;
bounds.origin.x += border.left;
bounds.origin.y += border.top;
bounds.size.width -= border.horizontal();
bounds.size.height -= border.vertical();
let base = state.create_base_display_item(&bounds,
&clip,
self.node,
style.get_cursor(Cursor::Default),
display_list_section);
let gradient_display_item = DisplayItem::Gradient(box GradientDisplayItem {
let display_item = match gradient.gradient_kind {
GradientKind::Linear(ref angle_or_corner) => {
let gradient = self.convert_linear_gradient(&bounds,
&gradient.stops[..],
angle_or_corner,
gradient.repeating,
style);
DisplayItem::Gradient(box GradientDisplayItem {
base: base,
gradient: x,
});
state.add_display_item(gradient_display_item);
} else if let Some(x) = self.convert_radial_gradient(gradient, style) {
let base = state.create_base_display_item(absolute_bounds,
&clip,
self.node,
style.get_cursor(Cursor::Default),
display_list_section);
let gradient_display_item = DisplayItem::RadialGradient(box RadialGradientDisplayItem {
base: base,
gradient: x,
});
state.add_display_item(gradient_display_item);
gradient: gradient,
})
}
GradientKind::Radial(ref shape, ref center) => {
let gradient = self.convert_radial_gradient(&bounds,
&gradient.stops[..],
shape,
center,
gradient.repeating,
style);
DisplayItem::RadialGradient(box RadialGradientDisplayItem {
base: base,
gradient: gradient,
})
}
};
state.add_display_item(display_item);
}
fn build_display_list_for_box_shadow_if_applicable(&self,
@ -1299,22 +1289,24 @@ impl FragmentDisplayListBuilding for Fragment {
}
Some(computed::Image::Gradient(ref gradient)) => {
match gradient.gradient_kind {
GradientKind::Linear(_) => {
let grad = self.convert_gradient(&bounds, gradient, style);
GradientKind::Linear(angle_or_corner) => {
let grad = self.convert_linear_gradient(&bounds,
&gradient.stops[..],
&angle_or_corner,
gradient.repeating,
style);
if let Some(x) = grad {
state.add_display_item(DisplayItem::Border(box BorderDisplayItem {
base: base,
border_widths: border.to_physical(style.writing_mode),
details: BorderDetails::Gradient(display_list::GradientBorder {
gradient: x,
gradient: grad,
// TODO(gw): Support border-image-outset
outset: SideOffsets2D::zero(),
}),
}));
}
}
GradientKind::Radial(_, _) => {
// TODO(gw): Handle border-image with radial gradient.
}

1
components/style/values/computed/image.rs
View file

@ -20,7 +20,6 @@ use values::specified::url::SpecifiedUrl;
pub use values::specified::SizeKeyword;
impl ToComputedValue for specified::Image {
type ComputedValue = Image;