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layout: Implement CSS linear gradients per the CSS-IMAGES specification.

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This implements the CSS `linear-gradient` property per the CSS-IMAGES
specification:

    http://dev.w3.org/csswg/css-images-3/

Improves GitHub.
This commit is contained in:
Patrick Walton 2014-10-15 21:07:36 -07:00
parent 44fa9f9b18
commit 215c2a9d4c
17 changed files with 865 additions and 42 deletions
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32
components/gfx/display_list/mod.rs
View file

@ -33,6 +33,10 @@ use std::slice::Items;
use style::computed_values::border_style;
use sync::Arc;
// It seems cleaner to have layout code not mention Azure directly, so let's just reexport this for
// layout to use.
pub use azure::azure_hl::GradientStop;
pub mod optimizer;
/// An opaque handle to a node. The only safe operation that can be performed on this node is to
@ -295,6 +299,7 @@ pub enum DisplayItem {
TextDisplayItemClass(Box<TextDisplayItem>),
ImageDisplayItemClass(Box<ImageDisplayItem>),
BorderDisplayItemClass(Box<BorderDisplayItem>),
GradientDisplayItemClass(Box<GradientDisplayItem>),
LineDisplayItemClass(Box<LineDisplayItem>),
/// A pseudo-display item that exists only so that queries like `ContentBoxQuery` and
@ -382,6 +387,22 @@ pub struct ImageDisplayItem {
pub stretch_size: Size2D<Au>,
}
/// Paints a gradient.
#[deriving(Clone)]
pub struct GradientDisplayItem {
/// Fields common to all display items.
pub base: BaseDisplayItem,
/// The start point of the gradient (computed during display list construction).
pub start_point: Point2D<Au>,
/// The end point of the gradient (computed during display list construction).
pub end_point: Point2D<Au>,
/// A list of color stops.
pub stops: Vec<GradientStop>,
}
/// Renders a border.
#[deriving(Clone)]
pub struct BorderDisplayItem {
@ -482,6 +503,13 @@ impl DisplayItem {
border.style)
}
GradientDisplayItemClass(ref gradient) => {
render_context.draw_linear_gradient(&gradient.base.bounds,
&gradient.start_point,
&gradient.end_point,
gradient.stops.as_slice());
}
LineDisplayItemClass(ref line) => {
render_context.draw_line(&line.base.bounds,
line.color,
@ -498,6 +526,7 @@ impl DisplayItem {
TextDisplayItemClass(ref text) => &text.base,
ImageDisplayItemClass(ref image_item) => &image_item.base,
BorderDisplayItemClass(ref border) => &border.base,
GradientDisplayItemClass(ref gradient) => &gradient.base,
LineDisplayItemClass(ref line) => &line.base,
PseudoDisplayItemClass(ref base) => &**base,
}
@ -509,6 +538,7 @@ impl DisplayItem {
TextDisplayItemClass(ref mut text) => &mut text.base,
ImageDisplayItemClass(ref mut image_item) => &mut image_item.base,
BorderDisplayItemClass(ref mut border) => &mut border.base,
GradientDisplayItemClass(ref mut gradient) => &mut gradient.base,
LineDisplayItemClass(ref mut line) => &mut line.base,
PseudoDisplayItemClass(ref mut base) => &mut **base,
}
@ -535,6 +565,7 @@ impl fmt::Show for DisplayItem {
TextDisplayItemClass(_) => "Text",
ImageDisplayItemClass(_) => "Image",
BorderDisplayItemClass(_) => "Border",
GradientDisplayItemClass(_) => "Gradient",
LineDisplayItemClass(_) => "Line",
PseudoDisplayItemClass(_) => "Pseudo",
},
@ -544,3 +575,4 @@ impl fmt::Show for DisplayItem {
)
}
}