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Implement 'background-clip' property in CSS3 Background

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This property determines the background painting area, which determines the area
within which the background is painted.

Spec: http://dev.w3.org/csswg/css-backgrounds-3/#background-clip

Fixes #6066.
This commit is contained in:
Jinwoo Song 2015-05-15 16:45:13 +09:00
parent 09f5648153
commit a51d5de860
7 changed files with 116 additions and 5 deletions
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27
components/layout/display_list_builder.rs
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@ -43,7 +43,7 @@ use std::sync::Arc;
use std::sync::mpsc::channel;
use style::computed_values::filter::Filter;
use style::computed_values::transform::ComputedMatrix;
use style::computed_values::{background_attachment, background_origin, background_repeat, background_size};
use style::computed_values::{background_attachment, background_clip, background_origin, background_repeat, background_size};
use style::computed_values::{border_style, image_rendering, overflow_x, position, visibility};
use style::properties::ComputedValues;
use style::properties::style_structs::Border;
@ -309,8 +309,31 @@ impl FragmentDisplayListBuilding for Fragment {
// inefficient. What we really want is something like "nearest ancestor element that
// doesn't have a fragment".
let background_color = style.resolve_color(style.get_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
let mut bounds = *absolute_bounds;
match style.get_background().background_clip {
background_clip::T::border_box => {}
background_clip::T::padding_box => {
let border = style.logical_border_width().to_physical(style.writing_mode);
bounds.origin.x = bounds.origin.x + border.left;
bounds.origin.y = bounds.origin.y + border.top;
bounds.size.width = bounds.size.width - border.horizontal();
bounds.size.height = bounds.size.height - border.vertical();
}
background_clip::T::content_box => {
let border_padding = self.border_padding.to_physical(style.writing_mode);
bounds.origin.x = bounds.origin.x + border_padding.left;
bounds.origin.y = bounds.origin.y + border_padding.top;
bounds.size.width = bounds.size.width - border_padding.horizontal();
bounds.size.height = bounds.size.height - border_padding.vertical();
}
}
display_list.push(DisplayItem::SolidColorClass(box SolidColorDisplayItem {
base: BaseDisplayItem::new(*absolute_bounds,
base: BaseDisplayItem::new(bounds,
DisplayItemMetadata::new(self.node,
style,
Cursor::DefaultCursor),