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style: Define offset-path and implement it in style system.

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Define OffsetPath & SVGPathData on the servo-side, and StyleMotion &
StyleSVGPath on the gecko-side. We parse the SVG Path string into a
vector of PathCommand. To build the gfx::Path, we will convert it into
gfx::Path later in a different patch.

The basic flow is:
  - Parse SVG Path String into SVGPathData (in Rust).
  - Use cbindgen to make sure the layout of PathCommand and StylePathCommand, and then set the Box[PathCommand] into nsTArray<StylePathCommand>.
  - Try to convert nsTArray<StylePathCommand> into gfx::Path. (This part will be implemented in a different patch.)

Finally, we use the gfx::Path to create a motion path transform.
The layout implementation is in the later patch.

Depends on D2962

Differential Revision: https://phabricator.services.mozilla.com/D2963
This commit is contained in:
Boris Chiou 2018-08-22 01:24:13 +00:00 • committed by Emilio Cobos Álvarez
parent 249b865eb8
commit dce2e2927f
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8 changed files with 742 additions and 3 deletions
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2
components/style/values/computed/mod.rs
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@ -65,6 +65,7 @@ pub use self::length::{NonNegativeLengthOrPercentage, NonNegativeLengthOrPercent
pub use self::list::Quotes;
#[cfg(feature = "gecko")]
pub use self::list::ListStyleType;
pub use self::motion::OffsetPath;
pub use self::outline::OutlineStyle;
pub use self::percentage::{Percentage, NonNegativePercentage};
pub use self::position::{GridAutoFlow, GridTemplateAreas, Position, ZIndex};
@ -100,6 +101,7 @@ pub mod gecko;
pub mod image;
pub mod length;
pub mod list;
pub mod motion;
pub mod outline;
pub mod percentage;
pub mod position;