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gfx: Implement box-shadow per CSS-BACKGROUNDS.

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This commit is contained in:
Patrick Walton 2014-11-07 14:27:08 -08:00
parent 1bc2c8a639
commit 3ba0abd8ff
21 changed files with 766 additions and 31 deletions
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80
components/layout/display_list_builder.rs
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@ -24,12 +24,14 @@ use util::{OpaqueNodeMethods, ToGfxColor};
use geom::approxeq::ApproxEq;
use geom::{Point2D, Rect, Size2D, SideOffsets2D};
use gfx::color;
use gfx::display_list::{BaseDisplayItem, BorderDisplayItem, BorderDisplayItemClass, DisplayItem};
use gfx::display_list::{DisplayList, GradientDisplayItem, GradientDisplayItemClass, GradientStop};
use gfx::display_list::{ImageDisplayItem, ImageDisplayItemClass, LineDisplayItem, BorderRadii};
use gfx::display_list::{LineDisplayItemClass, SidewaysLeft, SidewaysRight};
use gfx::display_list::{SolidColorDisplayItem, SolidColorDisplayItemClass, StackingContext};
use gfx::display_list::{TextDisplayItem, TextDisplayItemClass, Upright};
use gfx::display_list::{BOX_SHADOW_INFLATION_FACTOR, BaseDisplayItem, BorderDisplayItem};
use gfx::display_list::{BorderDisplayItemClass, BorderRadii, BoxShadowDisplayItem};
use gfx::display_list::{BoxShadowDisplayItemClass, DisplayItem, DisplayList};
use gfx::display_list::{GradientDisplayItem, GradientDisplayItemClass};
use gfx::display_list::{GradientStop, ImageDisplayItem, ImageDisplayItemClass, LineDisplayItem};
use gfx::display_list::{LineDisplayItemClass, SidewaysLeft};
use gfx::display_list::{SidewaysRight, SolidColorDisplayItem, SolidColorDisplayItemClass};
use gfx::display_list::{StackingContext, TextDisplayItem, TextDisplayItemClass, Upright};
use gfx::paint_task::PaintLayer;
use servo_msg::compositor_msg::{FixedPosition, Scrollable};
use servo_msg::constellation_msg::{ConstellationChan, FrameRectMsg};
@ -112,12 +114,24 @@ pub trait FragmentDisplayListBuilding {
level: StackingLevel,
clip_rect: &Rect<Au>);
/// Adds the display items necessary to paint the outline of this fragment to the display list
/// if necessary.
fn build_display_list_for_outline_if_applicable(&self,
style: &ComputedValues,
display_list: &mut DisplayList,
bounds: &Rect<Au>,
clip_rect: &Rect<Au>);
/// Adds the display items necessary to paint the box shadow of this fragment to the display
/// list if necessary.
fn build_display_list_for_box_shadow_if_applicable(&self,
style: &ComputedValues,
list: &mut DisplayList,
layout_context: &LayoutContext,
level: StackingLevel,
absolute_bounds: &Rect<Au>,
clip_rect: &Rect<Au>);
fn build_debug_borders_around_text_fragments(&self,
display_list: &mut DisplayList,
flow_origin: Point2D<Au>,
@ -413,6 +427,32 @@ impl FragmentDisplayListBuilding for Fragment {
display_list.push(gradient_display_item, level)
}
fn build_display_list_for_box_shadow_if_applicable(&self,
style: &ComputedValues,
list: &mut DisplayList,
_layout_context: &LayoutContext,
level: StackingLevel,
absolute_bounds: &Rect<Au>,
clip_rect: &Rect<Au>) {
// NB: According to CSS-BACKGROUNDS, box shadows render in *reverse* order (front to back).
for box_shadow in style.get_effects().box_shadow.iter().rev() {
let inflation = box_shadow.spread_radius + box_shadow.blur_radius *
BOX_SHADOW_INFLATION_FACTOR;
let bounds =
absolute_bounds.translate(&Point2D(box_shadow.offset_x, box_shadow.offset_y))
.inflate(inflation, inflation);
list.push(BoxShadowDisplayItemClass(box BoxShadowDisplayItem {
base: BaseDisplayItem::new(bounds, self.node, *clip_rect),
box_bounds: *absolute_bounds,
color: style.resolve_color(box_shadow.color).to_gfx_color(),
offset: Point2D(box_shadow.offset_x, box_shadow.offset_y),
blur_radius: box_shadow.blur_radius,
spread_radius: box_shadow.spread_radius,
inset: box_shadow.inset,
}), level);
}
}
fn build_display_list_for_borders_if_applicable(&self,
style: &ComputedValues,
display_list: &mut DisplayList,
@ -590,6 +630,34 @@ impl FragmentDisplayListBuilding for Fragment {
let level =
StackingLevel::from_background_and_border_level(background_and_border_level);
// Add a shadow to the list, if applicable.
match self.inline_context {
Some(ref inline_context) => {
for style in inline_context.styles.iter().rev() {
self.build_display_list_for_box_shadow_if_applicable(
&**style,
display_list,
layout_context,
level,
&absolute_fragment_bounds,
clip_rect);
}
}
None => {}
}
match self.specific {
ScannedTextFragment(_) => {},
_ => {
self.build_display_list_for_box_shadow_if_applicable(
&*self.style,
display_list,
layout_context,
level,
&absolute_fragment_bounds,
clip_rect);
}
}
// Add the background to the list, if applicable.
match self.inline_context {
Some(ref inline_context) => {