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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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components/style/values/computed/motion.rs Normal file
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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//! Computed types for CSS values that are related to motion path.
/// A computed offset-path. The computed value is as specified value.
///
/// https://drafts.fxtf.org/motion-1/#offset-path-property
pub use values::specified::motion::OffsetPath as OffsetPath;