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Add build_display_list_for_background_if_applicable_with_background

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This commit is contained in:
Manish Goregaokar 2018-02-14 13:05:02 -08:00
parent f3531d1d35
commit f7ac5d712f
1 changed files with 29 additions and 2 deletions
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31
components/layout/display_list/builder.rs
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@ -531,6 +531,18 @@ pub trait FragmentDisplayListBuilding {
absolute_bounds: &Rect<Au>,
);
/// Same as build_display_list_for_background_if_applicable, but lets you
/// override the actual background used
fn build_display_list_for_background_if_applicable_with_background(
&self,
state: &mut DisplayListBuildState,
style: &ComputedValues,
background: &style_structs::Background,
background_color: RGBA,
display_list_section: DisplayListSection,
absolute_bounds: &Rect<Au>,
);
/// Determines where to place an element background image or gradient.
///
/// Photos have their resolution as intrinsic size while gradients have
@ -929,13 +941,28 @@ impl FragmentDisplayListBuilding for Fragment {
style: &ComputedValues,
display_list_section: DisplayListSection,
absolute_bounds: &Rect<Au>,
) {
let background = style.get_background();
let background_color = style.resolve_color(background.background_color);
// XXXManishearth the below method should ideally use an iterator over
// backgrounds
self.build_display_list_for_background_if_applicable_with_background(
state, style, background, background_color, display_list_section, absolute_bounds)
}
fn build_display_list_for_background_if_applicable_with_background(
&self,
state: &mut DisplayListBuildState,
style: &ComputedValues,
background: &style_structs::Background,
background_color: RGBA,
display_list_section: DisplayListSection,
absolute_bounds: &Rect<Au>,
) {
// FIXME: This causes a lot of background colors to be displayed when they are clearly not
// needed. We could use display list optimization to clean this up, but it still seems
// inefficient. What we really want is something like "nearest ancestor element that
// doesn't have a fragment".
let background = style.get_background();
let background_color = style.resolve_color(background.background_color);
// 'background-clip' determines the area within which the background is painted.
// http://dev.w3.org/csswg/css-backgrounds-3/#the-background-clip