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Implement correct corner clipping for background color

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Add one regression ref test.

See also #19649
This commit is contained in:
Pyfisch 2017-12-29 21:27:58 +01:00
parent 691bff86b6
commit b3b49e3ff0
4 changed files with 104 additions and 15 deletions
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40
components/layout/display_list_builder.rs
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@ -681,7 +681,7 @@ fn build_border_radius(abs_bounds: &Rect<Au>,
fn build_border_radius_for_inner_rect(outer_rect: &Rect<Au>,
style: &ComputedValues)
-> BorderRadii<Au> {
let mut radii = build_border_radius(&outer_rect, style.get_border());
let radii = build_border_radius(&outer_rect, style.get_border());
if radii.is_square() {
return radii;
}
@ -690,18 +690,7 @@ fn build_border_radius_for_inner_rect(outer_rect: &Rect<Au>,
// border width), we need to adjust to border radius so that we are smaller
// rectangle with the same border curve.
let border_widths = style.logical_border_width().to_physical(style.writing_mode);
radii.top_left.width = cmp::max(Au(0), radii.top_left.width - border_widths.left);
radii.bottom_left.width = cmp::max(Au(0), radii.bottom_left.width - border_widths.left);
radii.top_right.width = cmp::max(Au(0), radii.top_right.width - border_widths.right);
radii.bottom_right.width = cmp::max(Au(0), radii.bottom_right.width - border_widths.right);
radii.top_left.height = cmp::max(Au(0), radii.top_left.height - border_widths.top);
radii.top_right.height = cmp::max(Au(0), radii.top_right.height - border_widths.top);
radii.bottom_left.height = cmp::max(Au(0), radii.bottom_left.height - border_widths.bottom);
radii.bottom_right.height = cmp::max(Au(0), radii.bottom_right.height - border_widths.bottom);
radii
calculate_inner_border_radii(radii, border_widths)
}
fn build_inner_border_box_for_border_rect(border_box: &Rect<Au>,
@ -1041,6 +1030,24 @@ fn calculate_inner_bounds(mut bounds: Rect<Au>, offsets: SideOffsets2D<Au>) -> R
bounds
}
fn calculate_inner_border_radii(
mut radii: BorderRadii<Au>,
offsets: SideOffsets2D<Au>
) -> BorderRadii<Au> {
radii.top_left.width = cmp::max(Au(0), radii.top_left.width - offsets.left);
radii.bottom_left.width = cmp::max(Au(0), radii.bottom_left.width - offsets.left);
radii.top_right.width = cmp::max(Au(0), radii.top_right.width - offsets.right);
radii.bottom_right.width = cmp::max(Au(0), radii.bottom_right.width - offsets.right);
radii.top_left.height = cmp::max(Au(0), radii.top_left.height - offsets.top);
radii.top_right.height = cmp::max(Au(0), radii.top_right.height - offsets.top);
radii.bottom_left.height = cmp::max(Au(0), radii.bottom_left.height - offsets.bottom);
radii.bottom_right.height = cmp::max(Au(0), radii.bottom_right.height - offsets.bottom);
radii
}
/// For a given area and an image compute how big the
/// image should be displayed on the background.
@ -1272,20 +1279,23 @@ impl FragmentDisplayListBuilding for Fragment {
let color_clip = get_cyclic(&background.background_clip.0,
background.background_image.0.len() - 1);
// Adjust the clipping region as necessary to account for `border-radius`.
let mut border_radii = build_border_radius(absolute_bounds, style.get_border());
match *color_clip {
BackgroundClip::BorderBox => {}
BackgroundClip::PaddingBox => {
let border = style.logical_border_width().to_physical(style.writing_mode);
bounds = calculate_inner_bounds(bounds, border);
border_radii = calculate_inner_border_radii(border_radii, border);
}
BackgroundClip::ContentBox => {
let border_padding = self.border_padding.to_physical(style.writing_mode);
bounds = calculate_inner_bounds(bounds, border_padding);
border_radii = calculate_inner_border_radii(border_radii, border_padding);
}
}
// Adjust the clipping region as necessary to account for `border-radius`.
let border_radii = build_border_radius(absolute_bounds, style.get_border());
let clip = if !border_radii.is_square() {
LocalClip::RoundedRect(bounds.to_rectf(), ComplexClipRegion::new(
bounds.to_rectf(),